ETF securities lending revenue — the hidden positive cost driver
An ETF you bought to "hold the index" doesn't sit still. Behind the scenes, the fund lends its underlying holdings overnight to short-sellers and earns fee income. For some funds this revenue offsets a third of the OCF — quietly making "expensive" funds cheaper than they look on paper. Here's how it works, what the risk really is, and how much revenue each major provider passes back to investors.
What securities lending actually is
An institutional borrower — usually a hedge fund or prime broker on behalf of a short-seller — needs to borrow specific shares temporarily. Maybe they want to short-sell Tesla, or settle a failed trade, or hedge a derivative position. They approach a custodian or lending agent and ask to borrow, say, 100,000 Tesla shares for the next two weeks.
The lending agent matches this demand with supply — long-term holders who own Tesla shares and don't need them in their own account every day. ETFs are an ideal lender: they hold large positions, they're patient holders, and they have a custody bank already in place to facilitate the mechanics.
The deal: the ETF lends the 100,000 Tesla shares. The borrower pays a fee (typically 0.05% to 5% per year annualised, depending on demand) and posts collateral (usually 102–110% of share value, in cash or other securities, held by a triple-A custodian). When the borrower's done, they return the shares. The fee revenue is split between the lending agent (the custodian's lending desk), the fund and the fund manager.
How much revenue does it generate?
Securities lending revenue for a diversified equity ETF is typically 0.01% to 0.10% per year. For ETFs holding hard-to-borrow names (small caps, emerging markets), it can be 0.10% to 0.30% per year. Bond ETFs typically earn less — bond securities lending is a smaller market and bonds are often substitutable.
This sounds small, but it's directly comparable to OCF. An ETF with 0.20% OCF that earns 0.08% in securities lending revenue effectively has a 0.12% net OCF — a 40% reduction in real-world cost. For long-horizon retail investors the cumulative compounding effect is meaningful.
The revenue split — this is where providers differ
Securities lending revenue is shared between the lending agent, the fund and the fund manager. The split varies meaningfully by provider:
| Provider | Revenue split (fund / manager) | Typical net to investors |
|---|---|---|
| Vanguard | ~100% to fund | Vanguard passes effectively all lending revenue (net of agent costs) back to the fund. Highest direct investor benefit. |
| iShares (BlackRock) | ~62.5% / 37.5% | BlackRock retains roughly 37.5% of net lending revenue as agent fee; remaining ~62.5% goes to the fund. Disclosed in fund annual report. |
| Invesco | ~80% / 20% typical | Approximately 80% retained for the fund, varies by specific ETF |
| Xtrackers (DWS) | ~70% / 30% | Standard institutional split |
| HSBC | ~70% / 30% | Similar to Xtrackers |
Splits are typical and may vary by individual fund. Always check the relevant ETF's annual report for the actual policy.
Vanguard's near-100% pass-through is genuinely investor-friendly — one of the structural reasons their fund returns often beat similar-OCF competitors by a few basis points per year. Conversely, iShares' 37.5% retention is significant; on a fund generating 0.08% gross lending revenue, that's roughly 0.03% per year that goes to BlackRock's bottom line rather than the fund. Over decades, that compounds.
The risk side — counterparty risk + collateral
The risk is that the borrower fails to return the shares. UCITS rules require:
- Collateral posted upfront: typically 102–110% of share value, marked-to-market daily. So if Tesla goes up, the borrower must post more collateral. If they fail to post, the lending position is unwound automatically.
- Diversification of borrowers: no single counterparty can borrow more than a fixed percentage of fund assets (typically 10%)
- Collateral held by trust custodian: not by the borrower, so even if the borrower goes bust, the fund can seize the collateral immediately
- Daily reconciliation: positions and collateral are matched every business day
In a worst case — borrower defaults during a sharp market move — the fund could realise a small loss between the collateral marked-to-market on the previous day and the actual market value at unwinding. This worst-case loss is typically estimated at 0.05% to 0.30% of the lent position, not 100%. The "lending risk is huge" framing common in retail forums is overblown.
Historical evidence: in the 2008 financial crisis, several lending programmes did suffer small losses from collateral repricing in stressed markets, but no UCITS ETF lender suffered material harm. Post-2008 collateral rules tightened further; the risk in 2026 is meaningfully lower than it was in 2007.
How to find the lending revenue for your ETF
- Fund annual report (usually the most detailed)
- Section: "Securities financing transactions" or "Securities lending"
- Look for: gross lending revenue per year, fund share of revenue, % of fund assets typically on loan, top counterparties
- Fund KIID / KID: usually mentions whether lending is allowed and the maximum % of fund assets that can be on loan
- Fund manager's transparency report: most major UCITS managers publish an annual lending transparency report listing revenue and split across their fund range
- Tracking difference analysis: if a fund consistently outperforms (or underperforms) similar-OCF peers, lending revenue is one of the variables explaining the gap
Worked example — the cumulative effect
£50,000 invested for 25 years in two equivalent S&P 500 ETFs, both with 0.07% OCF, 7% gross return.
- ETF A (Vanguard-style, ~100% pass-through): earns 0.06% securities lending revenue, fully credited to fund. Effective OCF: 0.07% − 0.06% = 0.01%. Net return: 6.99%/yr. End value: ~£270,000.
- ETF B (iShares-style, ~62.5% pass-through): earns 0.06% gross, ~0.0375% credited to fund. Effective OCF: 0.07% − 0.0375% ≈ 0.0325%. Net return: 6.97%/yr. End value: ~£269,000.
The gap is small (~£1,000 over 25 years on £50k) because the underlying lending revenue is small. But the direction matters: a more generous pass-through is structurally favourable, even if the headline OCF is identical. And on larger pots or longer horizons, £1,000 turns into £10,000+.
ETFs that don't lend at all
Some ETFs explicitly don't engage in securities lending, often as a marketing differentiator:
- Some Vanguard funds (selective) — certain Vanguard products historically had a no-lending policy, but most Irish-domiciled Vanguard UCITS ETFs do lend (transparent split). Check the specific fund.
- Some ESG-focused funds — argument is that lending shares to short-sellers undermines the ESG voting / engagement angle. UBS MSCI Socially Responsible ETFs historically didn't lend; this is changing.
- Physical commodity ETCs (gold, silver) — these hold physical bars in vaults; nothing to lend.
- Synthetic ETFs — don't physically hold the underlying, so no securities to lend (though the swap counterparty often does its own lending against the basket)
Practical checklist for UK investors
- ✓ Don't avoid securities-lending ETFs. The economics are positive for investors; the risk is well-managed by UCITS rules. Avoidance based on lending alone leaves money on the table.
- ✓ Prefer providers with generous pass-through when comparing similar-OCF funds. Vanguard's near-100% pass-through is structurally favourable; iShares' 62.5% is the industry norm.
- ✓ Read the annual report if you hold a meaningful position. The fund discloses actual lending revenue, % of fund typically on loan, top borrowers and collateral arrangements.
- ✓ Don't conflate securities lending with synthetic replication. Different things. Lending happens within physical ETFs; synthetic ETFs use swaps. Both have counterparty risk but the mechanics differ entirely.
- ✓ For ESG / ethical concerns about short-selling: most major providers now offer "non-lending" share classes if you want to opt out, accepting the higher effective OCF in exchange.
Frequently asked questions
Does securities lending affect tracking error?
Slightly. Lending revenue is essentially a positive contributor to fund return relative to the index; if revenue is volatile (because demand varies), it adds a small amount of noise. But the noise is far smaller than the noise from other sources (rebalancing, cash drag), and the net effect is typically a tighter tracking difference because the lending revenue offsets some OCF.
What collateral does the borrower post?
For UCITS funds: typically a basket of high-quality liquid assets — government bonds (gilts, US Treasuries, German bunds), highly liquid equities, or cash. The composition must meet diversification and liquidity rules. Collateral is held at a separate custodian, not the borrower's own balance sheet.
What % of fund assets is typically on loan?
Varies hugely. For an S&P 500 tracker, typically 5–15% of fund AUM is on loan at any one time. For a small-cap or EM fund where shares are harder to borrow elsewhere, demand can drive that to 25%+. Annual reports disclose the average and peak utilisation.
Can a fund lend out 100% of its holdings?
Theoretically possible but extremely rare. UCITS rules don't impose a hard cap on the % of fund that can be on loan, but lending agents typically self-impose limits (40-50% maximum) for operational reasons. In practice, the demand side is the constraint — there isn't constant demand to borrow every position.
Do I have to vote my shares while they're on loan?
For a UCITS ETF holder you don't vote individual shares anyway — the fund holds the shares and votes them, or doesn't. When shares are on loan, voting rights typically transfer to the borrower. Funds usually recall lent positions before key votes (annual general meetings, major resolutions) so they can vote them. ESG-aware funds publish their recall policies.
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