Most large-bar gold in the world settles in London. Trading runs over-the-counter through bilateral relationships between LBMA members, anchored by a small number of vaults inside the M25 perimeter. Around 9,300 tonnes of gold sit in those vaults as of end-April 2026, against an average daily Loco London turnover of roughly $60 billion. The institutional stack behind that activity is small and unusually integrated. Standards come from the LBMA. Sovereign-tier custody sits with the Bank of England. Three clearing banks — HSBC, JP Morgan, and ICBC Standard Bank — operate their own vaults and jointly own the clearing company. Three security carriers — Brink’s, Malca-Amit, and Loomis — run the non-bank vault layer. The bars filling all of them are produced almost entirely outside the UK.
1. Loco London: settlement convention and market scale
“Loco London” names a settlement location, not a trading venue. A trade in gold or silver priced and confirmed Loco London commits the seller to deliver metal that physically resides — or, in the unallocated case, is credited as residing — in an approved London vault inside the M25 perimeter. The phrase travels through ETF prospectuses, refinery sales contracts, central-bank custody agreements, and bullion-bank confirmations as the default delivery convention for wholesale physical metal. When a contract elsewhere references a price feed and adds “Loco London,” it incorporates both a quality standard (London Good Delivery) and a location standard (held by a recognised London custodian) into the settlement obligation.
Trading happens bilaterally between LBMA members. There is no central exchange and no order book; settlement runs through book-entry transfers between accounts held at the clearing members and the Bank of England. A typical trade pairs a bullion bank with a refiner, a central bank, an ETF custodian, a mining producer, an industrial consumer, or another bullion bank. The LBMA publishes weekly aggregate trade data and monthly clearing statistics, while individual trades remain bilateral and confidential. Scale and standing relationships dominate. Counterparty admission, credit lines, and account access at one of the clearing members or the Bank of England define practical entry.
At end-April 2026, the LBMA’s monthly aggregate reported the following Loco London figures:
| Loco London — end-April 2026 | |
|---|---|
| Gold in London vaults | 9,372 tonnes (~$1.4 trillion, ~749,768 standard bars) |
| Silver in London vaults | 27,454 tonnes (~915,122 standard bars) |
| Average daily OTC turnover | ~$60 billion gold |
| Reporting authority | LBMA monthly aggregate, ~one-month lag |
| Reporting vault operators | 7 (3 clearing-bank vaults, 3 carrier vaults, Bank of England) |
| Bar count reference weight | 12.5 kg gold, 30 kg silver |
Counted metal is exclusively wholesale physical bullion held inside the London clearing system. Jewellery, retail holdings, and private vaults outside the network fall outside the report.
Most of the daily turnover never moves physically. Trades net through the clearing accounts as book entries, with allocated and unallocated balances reconciled at end of day. The physical inventory in the vaults is what makes the netting credible: without underlying allocated and unallocated metal, the unallocated balances bullion banks owe each other and their clients would have no anchor.
The standard physical unit underlying the system is the London Good Delivery 400 oz gold bar, produced by an LBMA-accredited refiner and accepted “as is” into a London vault. Smaller institutional formats — the 1 kg cast bar in particular — trade in the market alongside the canonical unit; the 400 oz reference weight is what backs the clearing system, ETF allocations, and central-bank holdings.
Within the M25 motorway ring sits every approved vault — Threadneedle Street, Canary Wharf, the City, Feltham, Hounslow, Shepperton. The LBMA defines metal held inside that perimeter as Loco London for the purposes of its vault-holdings data. Loco Zurich functions as the closest complementary settlement convention with its own pool of Swiss-vault inventory and its own clearing arrangements. Moving a position between the two requires physical relocation and re-registration into the Zurich clearing system.
2. The LBMA as institution: trade body and standard-setter
The London Bullion Market Association is a private trade association, incorporated in 1987 with the involvement of the Bank of England, which had until then informally overseen the market through the historical London Gold Market and London Silver Market — the two companies that ran the daily price fixings. The transition consolidated standard-setting and membership administration under a single body. A Bank of England representative continues to observe LBMA board meetings, but the LBMA is not a regulator and not an exchange. Its remit excludes trade authorisation, statutory member supervision, and venue operation. The Association’s authority comes from elsewhere — its standards have become the de facto global reference for wholesale physical metal, adopted under licence by futures exchanges including COMEX and used as the quality benchmark in central-bank custody agreements, ETF mandates, and inter-refiner trade.
The membership architecture has four tiers. Full Members are firms operationally active in the London market — bullion banks, refiners, vault operators, brokers, fabricators — and hold voting rights. Market Making Members carry an additional obligation: to quote two-way bid and offer prices in gold and silver to other Market Makers throughout the London business day, in agreed minimum sizes, across one or more of three products (Spot, Forwards, Options). There are currently eleven Market Makers; six are Full Market Makers quoting all three products. Associate and Affiliate members participate without voting rights — Associates are typically firms with bullion-related business but outside the core London market, Affiliates are service providers, technology vendors, exchanges, and intermediaries. Total membership stands at around 194 companies across 27 countries, dominated by financial institutions but including refiners, transportation firms, vaulting operators, and manufacturers.
The most substantive output of the LBMA is the Good Delivery Lists — separate registers for gold and silver — naming the refiners whose bars are accepted “as is” into a London vault for clearing-system entry. Around 66 gold and 78 silver refiners hold current Good Delivery status (count as of October 2023; the lists are continuously updated as refiners are added, removed, or moved to the Former List for failing to meet ongoing requirements). Accreditation requires evidence of refining capacity (a minimum of 10 tonnes of gold or 50 tonnes of silver per year), an established three-year track record, tangible net worth of at least £15 million, ownership disclosure, and adherence to the LBMA’s Responsible Gold and Responsible Silver Guidance — the supply-chain due-diligence framework that aligns with OECD guidance on conflict minerals and serves as the practical implementation of LBMA’s sourcing requirements. The list is administered through a system of accredited Referees — a small group of refiners (currently five) responsible for technical assessment of applicants and ongoing proactive monitoring of accredited refiners through periodic dip-sample assays. The Referee system is the technical backbone of the Good Delivery accreditation; the standard would not function without independent assayers acting on the LBMA’s behalf.
A persistent industry misconception is worth correcting at this point: the LBMA does not accredit or approve vaults. The Association states this explicitly on its own materials, and the LBMA’s own glossary annex repeats the disclaimer. What the LBMA does maintain is a list of custodians offering vaulting services in London — a published register of the firms whose vault holdings are included in the monthly aggregate data and that operate within the Loco London clearing perimeter. The distinction matters operationally. A vault is “Loco London” because it sits within the M25 and is operated by an LBMA member (or, in the Bank of England’s case, a recognised custodian whose accounts are part of the clearing system). Operational sign-off on physical security, insurance, or procedures does not come from the LBMA. The LBMA publishes Best Practice Guidelines for vault operations, but these are non-binding reference material rather than an accreditation.
Beyond Good Delivery and membership administration, the LBMA produces several other outputs that shape how the market functions in practice. It administers — through ICE Benchmark Administration as the third-party operator — the LBMA Gold Price and LBMA Silver Price, the twice-daily institutional reference benchmarks used as settlement references in ETF redemptions, mining royalty contracts, central-bank transactions, and a wide range of commercial agreements globally. It publishes the monthly vault-holdings data, the monthly clearing statistics (continuous since October 1996), and the weekly trade data (a more recent addition aimed at improving transparency in the OTC market). It maintains the Approved Weighers List — a separate accreditation covering firms qualified to weigh Good Delivery bars in the London market — and the Vault Operators Training programme, a non-mandatory certification adopted by some custodians inside and outside London. And it convenes industry working groups, including the Physical Committee (oversees Good Delivery) and the Vault Managers Working Group (convened by the Bank of England, includes representatives of the London vault operators, addresses bar quality and vault operational issues).
Across these outputs, the LBMA operates the quality and transparency layer that makes the OTC market function. Clearing, vaulting, pricing administration, and market-making sit with separate institutions — LPMCL, the named custodians, ICE Benchmark Administration, and the eleven Market Makers acting bilaterally. The Association’s own work is the standard itself. The Good Delivery List names which refiners produce accepted bars. Separately, the Approved Weighers List covers who can weigh those bars in London, and the Vault Operators Training programme codifies operational practice across the custodian layer. A parallel data layer — monthly vault holdings, monthly clearing statistics continuous since October 1996, and weekly trade data — makes the system legible from outside. The Good Delivery List is the operational artifact behind every bar acceptance into a London vault — a published register, periodically updated, against which a Swiss or Singaporean bar enters London custody without re-assay.
3. The Bank of England vault: sovereign-tier custody at Threadneedle Street
Since 1734, the Bank of England has occupied its premises at Threadneedle Street, EC2R 8AH. The gold vault sits beneath the building and the adjacent City premises, in a complex of chambers used continuously for bullion custody since the institution’s founding in 1694. The Bank’s role as gold custodian predates the LBMA by nearly three centuries, predates the formal Good Delivery system, and predates the existence of bullion banking as a distinct activity. When the London market was reorganised around the LBMA in 1987, the Bank’s existing custodial relationships and vault operations were absorbed into the new framework without disruption.
By volume, the Bank holds the second-largest gold vault in the world after the New York Federal Reserve’s at 33 Liberty Street. The Bank does not publish a precise total of physical gold held — its own vault holdings are reported as part of the LBMA’s monthly aggregate data — but the figure is large enough that the Bank’s custody balance accounts for a substantial fraction of the ~9,300 tonnes reported in London at end-April 2026. The custody is gold only. Silver does not appear at Threadneedle Street, which is part of why the LBMA’s silver vault-holdings data covers only the six commercial vault operators.
The customer base is principally sovereign. Around 30 central banks hold gold custody accounts at the Bank, including a substantial number of European central banks (the Bundesbank, the Banque de France, the Reserve Bank of India, and many others have held gold in London historically), plus international financial institutions and HM Treasury. Sovereign custody at the Bank of England continues an arrangement under which London was the natural location for monetary gold reserves during the gold-standard era and afterwards; many central banks have left their reserve gold in London for decades or longer, on the operational logic that London is where the deepest market for that gold exists if it ever needs to be mobilised.
Alongside sovereign accounts, the Bank provides custody to “certain commercial firms that facilitate central-bank access to the liquidity of the London gold market” — the LBMA’s own phrasing. In practice this means the LBMA’s clearing-member bullion banks (HSBC, ICBC Standard Bank, JP Morgan, UBS) hold custody accounts at the Bank of England alongside their own vault holdings at Canary Wharf, the City, or accounts at the carrier vaults. The commercial accounts at the Bank serve two functions. They give the bullion banks a settlement layer immediately adjacent to the central-bank account holders — a transfer between a central bank and a bullion bank can occur as a book entry between two accounts at the same custodian, without physical movement. They also give the bullion banks access to a vault that sits outside their own balance sheets, a non-trivial consideration for allocated holdings.
The Bank itself is not a member of the LBMA. The boundary is structurally significant. The Bank does not trade for its own account in the bullion market in the way a Full Member would; its role is custodial and, when acting as agent for HM Treasury or for other central banks, executory — purchase, sale, swap, and lease transactions handled through bullion-bank counterparties. The Bank participates in the market’s institutional architecture through the Vault Managers Working Group, which it convenes itself, bringing together the vault operators inside the London system to address bar quality, vault operational matters, and standards adjacent to those the LBMA maintains for refiners.
Monthly vault-holdings data appears on the Bank’s website with reporting lag comparable to the LBMA’s aggregate. The published figure captures the total volume of gold held in the vault, expressed in fine troy ounces. Customer-level breakdowns remain confidential. Periodic episodes have made fragments of the customer list visible — the Bundesbank’s repatriation programme in the 2010s, the Venezuelan central bank’s litigation over access to its London-held reserves, academic and journalistic work on central-bank gold reserves all draw on partial disclosures — but the Bank itself does not confirm individual customer holdings.
Operationally, the vault holds only large Good Delivery gold bars at the 400 oz reference weight, on allocated customer accounts. Coins, jewellery, non-Good-Delivery formats, and silver fall outside the Bank’s custodial scope. Customer holdings remain confidential, with external disclosure limited to the aggregate volume of gold in vault. Bar lists, account-level reconciliations, and movement records sit inside the custody relationship between the Bank and each account holder; they are not made public.
4. The commercial vault network
Outside the Bank of England, physical custody in the London market concentrates among six operators — three banks that are also LBMA clearing members, and three security carriers that operate vaults as their core business. The concentration is not regulatory. No rule limits the number of vault operators in London. The pattern reflects the operational economics of running a vault that meets the implicit standards of the Loco London clearing system: physical security at the level expected by central banks and bullion banks, all-risks insurance underwritten by Lloyd’s of London syndicates at full replacement value, operational procedures aligned with LBMA Best Practice Guidelines, integration with the clearing-system account architecture, and a capital base capable of absorbing operational risk on holdings measured in hundreds of tonnes. The result is a stable network of six operators that has not added a new participant since the mid-2010s. Only one operator (G4S Cash Solutions UK) has exited in recent memory.
4.1 Clearing banks with vault operations
Three of the LBMA’s four clearing-member banks operate their own physical vaults inside the London perimeter. Each combines a clearing role (an account at LPMCL and at the Bank of England) with a custodial role (a physical vault holding allocated and unallocated metal on behalf of clients), and each runs an institutional bullion business that takes positions in the metal it custodies.
Custody of record for SPDR Gold Shares (GLD), the largest physically-backed gold ETF globally, sits with HSBC Bank plc, London Branch at Level 17, 8 Canada Square, Canary Wharf, E14 5HQ — the bank’s London headquarters tower. The HSBC vault ranks among the largest commercial gold vaults in the world by holdings and serves other institutional mandates alongside GLD. HSBC also acts as a Full Market Maker quoting prices in spot, forwards, and options across both metals.
At 25 Bank Street, Canary Wharf, E14 5JP, JP Morgan Chase Bank holds allocated and unallocated metal for institutional clients including ETF mandates. iShares Gold Trust (IAU) keeps its physical gold in JP Morgan custody. The bank operates as a Full Market Maker across spot, forwards, and options in both metals.
Standard Bank’s pre-existing London vault — at 20 Gresham Street, EC2V 7JE, in the City, near the Bank of England — entered the LBMA clearing system long before the bank’s 2015 ownership change. When the Industrial and Commercial Bank of China acquired a 60% stake in Standard Bank Plc that year, ICBC Standard Bank Plc became the only London clearing-vault operation under direct Chinese state-bank ownership. ICBC Standard ranks smallest of the three vaulting clearing banks by holdings but holds a structurally distinct position in the market.
UBS AG, the fourth clearing-member bank, runs no London vault of its own. Scotiabank — the fifth historically — withdrew its physical bullion vaulting operation in London in 2018 as part of a broader exit from physical precious metals, while retaining LBMA clearing membership. Both meet clearing obligations through custody accounts at the three vaulting clearing banks or at the Bank of England. Their holdings appear within those custodians’ aggregates rather than as separate lines, which avoids double counting.
4.2 Security-carrier vault custodians
Three security-carrier firms operate the non-bank custodial layer of the London market. Custody, vaulting, and the secure transportation of bullion form their entire business. They sit operationally between the refiners delivering new metal into their vaults for entry into the clearing system and the institutional clients holding allocated accounts at the carriers as an alternative to bank custody. All three are LBMA members but not clearing members, and they take no proprietary positions in custodied metal.
Adjacent to Heathrow Airport — Unit 1, Radius Park, Faggs Road, Feltham, Middlesex TW14 0NG — Brink’s Limited handles a substantial share of physical gold and silver moving in or out of the UK by air freight. The flow includes refinery deliveries from continental Europe and Asia, ETF allocation movements, and customer repatriations. Brink’s is the largest of the three carrier vault operators globally. Parallel facilities in Singapore, Hong Kong, Zurich, Dubai, and other bullion hubs combine into the international carrier-custody network many institutional non-bank holders rely on.
Custody for several smaller gold ETFs runs through Malca-Amit Commodities Ltd at Unit 3C, Tamian Way, Green Lane, Hounslow, Middlesex TW4 6BL — also in the western M25 corridor, close to Heathrow. The London vault serves institutional clients, ETF mandates outside the HSBC and JP Morgan concentration, and refiner consignment stock. Malca-Amit operates a global vault network in parallel with Brink’s. Its presence in Singapore (via The Singapore FreePort) and Hong Kong matters particularly to clients holding parallel positions across the APAC corridor.
At Unit 13, Shepperton Business Park, P.O. Box 92, Govett Avenue — again on the western edge of the M25 — Loomis International (UK) Ltd holds the smallest of the three carrier vault books in London by reported holdings. The inclusion of the three carriers as a category in LBMA published data reflects their structural role. Without carrier vaults, institutional clients seeking physical allocated holdings would lack a non-bank alternative inside the London clearing perimeter. Carrier vaults are the standard option for ETF custody outside the HSBC/JPM concentration, for refiner consignment stock awaiting sale, and for institutional holders preferring custody outside a commercial bank’s balance sheet — short of a Bank of England account, which sits outside reach for non-central-bank counterparties in practice.
G4S Cash Solutions (UK) appeared in the LBMA’s vault-holdings data as a fourth carrier custodian until its exit from precious metals vaulting in the late 2010s. The historical inclusion is visible in the LBMA’s Alchemist coverage and older data publications; the current LBMA custodian list reflects the post-exit configuration.
4.3 LPMCL: who clears Loco London
London Precious Metal Clearing Limited (LPMCL) is the not-for-profit private company through which the London market settles its physical-gold and physical-silver flows. Ownership sits with four member banks — HSBC, ICBC Standard Bank, JP Morgan, and UBS — which double as the four clearing members of the LBMA. Clearing runs as a book-entry model. Trades between LPMCL members, and between LPMCL members and their clients, settle as transfers between unallocated metal accounts the members hold with one another. Physical movement happens only when a counterparty specifically calls for allocation or delivery out of the vault.
The two institutions are legally separate. LBMA sets standards and operates the membership and data layer; LPMCL operates the daily clearing infrastructure. Coordination is close — every LPMCL member is also an LBMA clearing member — but the boundary holds. As a market utility, LPMCL serves the participants who own it. Beyond the clearing banks, LBMA membership extends into refiners, vault operators, brokers, fabricators, and service providers.
Monthly clearing-volume statistics appear via the LBMA, continuous since October 1996. The figures capture daily-average tonnes and US dollar value of gold and silver transferred between clearing members. The underlying mechanics — the AURUM platform LPMCL operates for clearing instructions, the sub-account architecture, and the loco-swap conventions allowing positions to move between London and Zurich without physical transfer — sit at a deeper layer of clearing detail than this article covers. What the published numbers show is the size. Volumes routinely run into the hundreds of tonnes of gold and several thousand tonnes of silver per day, reflecting both client flow through the system and the inter-bank netting that occurs as bullion banks balance their books at end of day.
5. ETF custody as a function of London
When investor demand pushes a gold ETF to create new shares, the authorised participant has to deliver physical gold against those shares. When demand reverses, shares get redeemed and physical gold leaves the trust’s custody account. The mechanism is continuous. The result, for London, is that the largest physically-backed gold ETFs run their custody accounts in London vaults, where bars can be acquired and released inside the same clearing system the rest of the wholesale market uses. A substantial share of the world’s “investment gold” exists as ETF shares, and the physical backing for the largest funds sits in London.
Around 700 to 1,300 tonnes — the historical range of SPDR Gold Shares (GLD) holdings — has at typical levels accounted for a meaningful percentage of total reported London vault gold. World Gold Trust Services sponsors the trust and State Street Global Advisors markets it. HSBC Bank plc, London Branch holds the gold in allocated form at the HSBC vault in Canary Wharf. Each share corresponds to a defined fractional ounce of physical gold. A daily bar list — every Good Delivery bar in the trust’s allocated account, identified by refiner, serial number, fine weight, and assay — gives one of the most detailed public windows into a London-vaulted institutional holding.
Sponsored by BlackRock, iShares Gold Trust (IAU) is the second-largest US-listed physically-backed gold ETF; its physical gold sits in custody with JP Morgan Chase Bank, London Branch at 25 Bank Street. The trust publishes a periodic bar list and reports allocated holdings on a regular basis. iShares Physical Gold ETC (SGLN), the European-listed counterpart, also runs custody through JP Morgan in London.
Across the rest of the physically-backed gold and silver ETF universe, the pattern repeats. Invesco Physical Gold ETC, Wisdom Tree Physical Gold, Gold Bullion Securities, and a long list of smaller funds use London-based custody — predominantly HSBC and JP Morgan for gold, with Brink’s, Malca-Amit, and ICBC Standard Bank custodying portions of certain funds. Silver follows the parallel pattern. iShares Silver Trust (SLV) holds its physical silver with JP Morgan in London. The collective effect is that a substantial portion of reported London vault holdings — an estimable but undisclosed fraction of the non-Bank-of-England aggregate — represents ETF backing.
Why London rather than Zurich, Singapore, or New York? The concentration reflects several reinforcing factors. London hosts the deepest secondary market for Good Delivery bars, making creation and redemption flows operationally cheaper for funds that need to add or release physical metal as shares move. The LPMCL clearing system allows allocated bar transfers between custodians and refiners to settle as book entries inside the same clearing network. Custodial scale and insurance capacity at HSBC and JP Morgan London handle the largest ETF allocations within a single vault. And the UK’s investment-gold VAT exemption, combined with established custody-banking practice around segregation and bar-list reporting, makes the legal and tax framework mature and predictable.
London vault holdings are far from a passive inventory. When GLD adds 20 tonnes in a week of strong inflows, those tonnes are bars physically moving into the HSBC vault from refiner consignment stock or from other clearing-member accounts. When GLD bleeds 30 tonnes over a month, those bars exit custody and re-enter the wider Loco London pool, available to other holders. The published ETF flows — bar lists, fund-level total holdings, daily creation and redemption figures — sit among the most transparent windows available into the otherwise opaque movement of physical metal through the London system.
6. The London refining absence: from the Royal Mint Refinery to Baird & Co
For a market that handles thousands of tonnes of refined gold annually and holds the world’s largest concentration of Good Delivery bars, London is conspicuously absent from the refining side of the supply chain. No major LBMA Good Delivery gold refiner operates in the UK today at the scale of the Swiss refiners (Argor-Heraeus, Valcambi, PAMP, MKS PAMP, Metalor), the German operations (Heraeus in Hanau, Heimerle und Meule, C. Hafner, Agosi), or the major Asian and North American refiners. London stores, clears, and settles. The bars that fill its vaults arrive refinery-origin from elsewhere.
The historical position was very different. From 1852, N M Rothschild & Sons held the lease on the Royal Mint Refinery — adjacent to the Royal Mint at 19 Royal Mint Street in the East End. Anthony de Rothschild acquired the lease following an 1848 Royal Commission recommendation separating the Royal Mint’s refining function from coin-striking. Timing was favourable. The California gold discovery of 1848 and the Australian discovery of 1851 channelled substantial volumes of newly-mined gold into London, then the centre of the global gold trade in the era of the gold standard. The Royal Mint Refinery became one of the principal destinations.
Rothschild ran the refinery for 115 years. The freehold was acquired in the 1890s. The operation survived the abandonment of the gold standard, both World Wars, and the post-war restructuring of the bullion market. In November 1967, Rothschild sold the business to Engelhard Industries. The refinery relocated from the East End to Chessington in southwest London. Johnson Matthey and the Sheffield Smelting Company assessed and re-accredited the relocated operation as a Good Delivery refiner under Engelhard ownership. Some decades later, Engelhard-CLAL closed Chessington. The gold beam balance from the closed refinery now sits in the LBMA boardroom, gifted by the closing operator — a physical artefact of an industry that has not been reconstituted in the UK.
In January 2015, The Royal Mint — the government-owned mint at Llantrisant in South Wales that produces UK coinage — revived the “Royal Mint Refinery” brand for a line of investment gold and silver bars. The operation is small-bar investment-product manufacturing, separate from the Good Delivery refining the original Rothschild facility represented. The brand revival functions as a heritage product proposition, not a reconstitution of UK refining capacity.
Baird & Co Limited holds the position of the other continuously-operating UK gold refiner. Tony Baird founded the firm in 1967. The business began as a numismatic coin dealer, expanded into bullion bars and jewellery, and opened its first refinery in 1979. Headquarters sit at 48 Hatton Garden, in London’s traditional jewellery quarter. The current refinery is a 30,000-square-foot facility in Beckton, East London — relocated in 2008 to accommodate the Olympic redevelopment of Stratford.
Refining feed is principally scrap and recycled material. The process runs through induction-furnace melting, the Miller process (chlorination to produce metal chlorides), Aqua Regia treatment for 999.9 fine gold, and quality verification through sampling and assay. Baird became a Full Member of the LBMA in September 2000 and operates a full-service bullion business — refining, manufacturing of small bars and coins, vaulting facilities, an industrial supply business, and an international office in Singapore. The firm produces large bars including 400 oz and 1,000 oz formats. Current LBMA Good Delivery accreditation status for those large bars is best confirmed against the LBMA’s current published list rather than secondary references.
Refining at Good Delivery scale clusters where the supporting conditions exist together. Proximity to feedstock matters — mine doré flows, large-scale recycling streams, central-bank scrap returns. Capital-intensive plant requires depreciation across substantial throughput. Economies of scale favour consolidation at a small number of global operations. The UK lacks significant domestic mining; the industrial-scale precious-metals catalyst flows that anchor the German refiners run elsewhere; UK policy and industrial strategy have not targeted refining capacity. London’s market role consolidated instead around custody and clearing — which require capital, infrastructure, and institutional standing, all of which the city holds in depth.
In current terms, London inventory is refiner-origin metal produced outside the UK, entered through bullion-bank, ETF, central-bank, or carrier-account channels. A bar sitting in a Loco London vault was almost certainly cast in Switzerland, Germany, Japan, the United States, or the Middle East, then carried into one of the six commercial vaults or the Bank of England by Brink’s, Malca-Amit, or Loomis. The Swiss share is the largest single source. At Argor-Heraeus, the lineage runs in part back through the absorbed accreditation history of the original Royal Mint Refinery, picked up by the Swiss refining industry after the 1967 sale. Hanau anchors the German side, as home of Heraeus — the parent of Argor-Heraeus and a major refiner in its own right. From the United States, the dominant flow comes from Asahi Refining, which absorbed Johnson Matthey’s North American precious-metals operation. Japanese supply runs through Mitsubishi Materials, Tanaka Kikinzoku Kogyo, and Sumitomo Metal Mining. Korean, Chinese, and Indian Good Delivery refiners add further volume. Middle Eastern capacity at Emirates Gold and Al Etihad has grown materially. All of those supply lines converge on the same six vaults whose holdings the LBMA reports each month.
7. Who uses the London market and how
Behind the institutional architecture sit eight participant categories. Each touches a different combination of vault, clearing, market-making, insurance, and tax-framework infrastructure. The map below summarises where each one connects.
| Participant category | Primary custody / account route | Secondary infrastructure touched |
|---|---|---|
| Central banks | BoE custody (~30 sovereign accounts) | LBMA Market Makers as transaction agents |
| ETF issuers and sponsors | HSBC (GLD), JP Morgan (IAU, SGLN, SLV) | Brink’s, Malca-Amit, ICBC Standard for smaller funds |
| Bullion banks (clearing members + Market Makers) | LPMCL accounts + own vault, BoE, or carrier custody | All other categories as counterparties |
| Refiners (Swiss, German, US, Asian, Middle Eastern) | Delivery into approved London vaults via carriers | Bullion-bank intermediation |
| Mining producers and industrial consumers | Indirect — refiner and bullion-bank intermediation | Wholesale pricing reference |
| Institutional non-bank holders | Allocated/unallocated bullion-bank accounts; or carrier-vault custody via independent counterparty | Bullion-bank or independent counterparty admission |
| Lloyd’s of London | All-risks bullion storage, in-transit, and operational-risk insurance | Specialist precious-metals underwriting capacity |
| UK tax framework | Investment-gold VAT exemption | Non-resident tax-neutral custody |
Bank of England custody anchors the conservative end of institutional holding. Around 30 central banks hold gold accounts at Threadneedle Street, with positions from small reserves to several thousand tonnes at the top. The Bank acts as custodian and, when instructed, as agent for purchases, sales, swaps, and leases — typically executed by LBMA Market Maker bullion banks as transaction counterparties. Custody is allocated by definition. A central bank’s gold at the Bank of England is identified by bar list and remains its legal property, separate from the Bank’s own balance sheet. Movement out — repatriation to a domestic vault, transfer to a commercial vault, sale into the market — requires explicit instruction and physical handling. The Bundesbank’s 2013–2017 repatriation programme and the Polish, Hungarian, and other central-bank repatriations of the late 2010s have made those mechanics visible.
ETF custody concentrates at HSBC for SPDR Gold Shares and JP Morgan for iShares Gold Trust and several others. Brink’s, Malca-Amit, and ICBC Standard Bank handle secondary custody for smaller funds. Custody is allocated, bar lists are published, and share creation and redemption produces continuous physical flows in and out of the custody accounts. By some measures, ETF custody is the most active component of London’s physical inventory turnover, even though the underlying creation and redemption happens at the fund-sponsor level.
Liquidity comes from the bullion banks. Clearing members (HSBC, ICBC Standard Bank, JP Morgan, UBS) hold LPMCL accounts alongside custody at their own vaults, the Bank of England, or the carriers. The wider LBMA Market Maker group — BNP Paribas, Citibank, Goldman Sachs International, Merrill Lynch International, Morgan Stanley, Société Générale, Standard Chartered, Toronto Dominion Bank, and others — takes principal positions in spot, forward, and option markets, intermediates between refiners and end clients, and runs the unallocated metal accounts where much of the world’s gold exposure is held without physical allocation. The bullion-bank model itself — allocated and unallocated structure, credit considerations, operational interface with refiners and clients — is covered separately. What matters for London’s market structure is the bullion banks’ position as principal counterparty for almost every other participant category.
Refiner deliveries from Switzerland, Germany, Japan, the United States, and the wider Good Delivery list bring new metal into the system. Bars travel via Brink’s, Malca-Amit, or Loomis into one of the London vaults. The receiving vault weighs and physically checks bars new to the market; the clearing-bank vaults handle the Good Delivery acceptance check. Once accepted, a bar joins the Loco London clearing pool and moves between counterparties as book entries until a holder calls for allocation or physical removal. Bullion banks take new bars onto their books as inventory or consignment, with onward sale to ETF custody accounts, central-bank purchases, institutional clients, or other bullion banks.
Mining producers and industrial consumers connect to London indirectly. Producer doré goes to a refiner — Asahi, a Swiss operation, or a German one — and the refined output enters Loco London on the bullion-bank side of the deal. Industrial buyers (electronics manufacturers, jewellery fabricators, dental suppliers) source refined metal in working formats from refiners and bullion banks. For both groups, London is the wholesale pricing reference and, occasionally, the physical transit point.
Three channels run into the London market for corporate treasuries, sovereign wealth funds without central-bank-tier custody, family offices, endowments, and private investment entities. Allocated bullion-bank accounts — held at the bank’s own vault or at carrier vaults under nominee arrangements — cover the conventional route. Unallocated bullion-bank accounts provide gold exposure without physical allocation, suited to trading and short-duration positioning. Allocated custody at a carrier vault (Brink’s, Malca-Amit, Loomis), contracted through an independent counterparty that holds the commercial relationship with the refiner and the carrier, runs outside the bullion-bank perimeter. That third model contracts LBMA Good Delivery formats from refinery-origin supply (Heraeus, Argor-Heraeus, the wider Swiss and German refiner set), with carrier custody keeping allocated holdings off any commercial bank’s balance sheet.
Beneath all of this sits Lloyd’s of London. The specialist insurance market underwrites the all-risks bullion-storage policies vault operators carry on customer holdings, the in-transit policies the carriers operate on bullion movements, and the operational-risk policies bullion banks hold against custody and clearing exposures. Capacity matters at scale. Insured exposure at any single London vault runs into the tens of billions of dollars; cumulative exposure across the system runs into hundreds of billions. Lloyd’s holds the deepest pool of specialist precious-metals underwriting capacity globally. Zurich and Singapore vaults work under similar insurance arrangements, but the depth of Lloyd’s syndicate capacity is part of why the bullion custody business has stayed in London.
UK tax treatment forms the final structural layer. Investment-grade gold is VAT-exempt under provisions implementing the EU’s Investment Gold Directive, retained in UK law after the 2020 EU exit. Silver, platinum, and palladium fall outside that exemption; silver attracts the standard 20% VAT, which is part of why silver vaulting in London is dominated by clearing-system inventory and ETF custody. Certain UK-mint coin formats (Britannia, Sovereign) also fall outside capital gains tax. Together, the rules let gold be held, traded, and transferred between London-resident custody accounts without VAT friction. For non-resident institutional holders — the dominant category at the London vault network — the UK framework is largely irrelevant to the holding itself. Gold held under bond at a London vault by a non-UK-resident party sits outside the UK tax perimeter for the underlying owner. London vaults therefore work comfortably as custody for foreign central banks, foreign sovereign wealth funds, foreign-domiciled ETFs, and foreign-domiciled institutional accounts.
The participant map sits behind every operational decision the system handles. A central bank picking a custody location lands on BoE accounts. ETF issuers needing scalable allocated custody land on HSBC or JP Morgan. A refiner shipping a new bar batch enters via a carrier and a clearing-member vault. Choices between bullion-bank custody and carrier-vault custody play out across different account architectures, and the consequences run through to counterparty risk, insurance attachment, and the mechanics of any later move between London and Zurich or repatriation out of the system altogether.