London Good Delivery bars dominate institutional settlement, while kilobars offer smaller denominations. The trade-off is liquidity, handling, premiums and custody flexibility.
Executive Summary
A 400-troy-ounce London Good Delivery bar is the institutional workhorse of the wholesale gold market. Kilobars are much smaller and widely used in private-wealth markets, but LBMA makes an important technical distinction: kilobars are not themselves London Good Delivery bars.
For a family office, the choice is less about which bar is “more valuable” and more about how the gold will be stored, transferred, sold, pledged or distributed between beneficiaries. Large bars favour wholesale efficiency; smaller bars favour denomination flexibility.
Key Takeaways
- London Good Delivery gold bars normally contain roughly 350–430 fine troy ounces and meet strict purity and marking requirements.
- Kilobars are approximately one kilogram and easier to split across transactions or beneficiaries.
- Smaller bars usually involve more fabrication, packaging and handling per ounce.
- A 400oz bar can be highly efficient in institutional vaulting but is an indivisible asset for many practical purposes.
- The custody platform and exit market should be chosen before the bar format, not after.
Why the 400oz Bar Matters
The London wholesale market is built around Good Delivery standards. Those standards create interchangeability: an acceptable bar can move through the professional market without every buyer re-negotiating what constitutes eligible metal. Serial numbers, refiner marks, fineness and year of manufacture are central to the system.
That standardisation is valuable to institutions because it reduces friction when large quantities move between banks, vaults and market participants. For a family office holding several million pounds of gold, fewer large bars may also simplify inventory management.
Why Private Wealth Often Prefers Kilobars
Kilobars reduce denomination risk. A family can liquidate one kilogram without selling a 12-kilogram-plus Good Delivery bar, and can distribute holdings across vaults, trusts or beneficiaries more precisely. They may also be easier to transport within private-wealth custody networks, subject to security and customs rules.
The trade-off is cost. Smaller bars generally require more fabrication and handling. A portfolio built entirely from small bars can therefore carry higher spreads and storage administration per ounce than an institutional wholesale holding.
Liquidity Depends on the Exit Route
Liquidity is not simply a function of bar size. A 400oz bar inside an accepted London-chain vault can be exceptionally liquid in the institutional market, while an identical-looking bar outside the recognised custody chain may require testing before sale. Likewise, a reputable kilobar from a well-known refiner may have excellent private-market liquidity.
Families should therefore ask the proposed dealer where the bar can be sold without re-assay, what deductions apply on repurchase, and whether the vault relationship preserves the chain of integrity expected by the target market.
A Blended Denomination Policy
A practical approach can be to hold the strategic core in large institutional bars and a liquidity sleeve in kilobars or smaller recognised products. That creates a balance between low-friction wholesale custody and more granular access.
The correct mix depends on the expected holding period, transaction size, family governance, estate-planning structure and whether the gold may eventually be moved across jurisdictions.
APX Perspective
Bar format is a portfolio-design decision, not a cosmetic one. APX would prioritise custody chain, exit liquidity and legal title first, then choose the denominations that minimise unnecessary friction for the family’s intended use.
Frequently Asked Questions
Are kilobars London Good Delivery?
No. LBMA specifically notes that kilobars do not meet the full London Good Delivery bar specification, although they are widely traded and may be produced by highly reputable refiners.
Is a 400oz bar exactly 400 ounces?
Not necessarily. London Good Delivery rules allow a range around that figure; the precise fine-gold content is calculated from the bar’s gross weight and assay.
Can a family own both?
Yes. A blended holding can combine institutional-scale bars with smaller denominations for liquidity or distribution.
Related APX Intelligence
Sources & Further Reading
APX Intelligence is editorial information only and does not constitute investment, legal, tax or financial advice. High-value physical assets can be illiquid, costly to insure and store, and may involve jurisdiction-specific legal or tax considerations.
