Every exchange-traded fund comes with a prospectus—a dense document that few investors read. Buried inside that boilerplate is a clause that should make anyone with money in a passive fund stop and squint. It permits the fund manager to trade against the very assets the fund holds. Securities lending, derivatives overlays, cross-trading between affiliated funds—all are allowed, often without meaningful limits. This is not a fringe practice; it is standard, disclosed only in legalese. The promise of passive investing is that you own a slice of the market and the manager simply tracks an index. But that promise has a footnote, and the footnote lets the manager bet against you.

The Prospectus Paragraph That Should Make You Squint

Open the prospectus of almost any US-listed ETF and search for the phrase "securities lending." You will find a paragraph authorizing the fund to lend its portfolio securities to broker-dealers, typically for short selling. The manager can earn revenue from these loans, which offsets fund expenses. What the paragraph does not say is that the same manager may also run a hedge fund or a separate account that is shorting those very securities. The conflict is not disclosed in any prominent way; it is embedded in a risk factor that reads like every other risk factor. This clause is legal under SEC rules. The Investment Company Act of 1940 permits lending as long as the fund receives collateral and marks the loans to market daily. But the act does not require the manager to avoid conflicts of interest when the lending agent is an affiliate. As of late 2024, the top five ETF issuers—BlackRock, Vanguard, State Street, Invesco, and Charles Schwab—all include such language in their prospectuses. Vanguard's 2024 prospectus for its Total Stock Market ETF (VTI) allows lending up to 33% of net asset value. BlackRock's iShares Core S&P 500 ETF (IVV) uses an internal lending agent with no explicit cap.

The contradiction with passive investing's core promise is stark. You buy an index fund to capture market returns without stock-picking risk. But when the manager lends your shares to a short seller, the fund's returns become partly dependent on how much short interest exists in its holdings. The fund gains a small lending fee, but the short seller's profit comes at the expense of the stock price—and thus the fund's NAV. The manager is effectively renting out your shares to someone who hopes they fall.

How One Clause Legalizes Internal Front-Running

The conflict is not hypothetical. Consider a large ETF that holds shares of a struggling retailer. A hedge fund wants to short that retailer. It borrows shares from the ETF through the fund's securities lending agent—often an affiliate of the manager. The hedge fund sells the borrowed shares, driving the price down. The ETF's NAV drops. The manager collects a lending fee, which reduces the fund's expense ratio slightly. But the ETF's shareholders absorb the full price decline, while the hedge fund profits.

In some cases, the manager itself runs a short-biased strategy in another vehicle. For example, a large asset manager may offer both a long-only S&P 500 ETF and a market-neutral fund that shorts overvalued stocks. The same research team that picks the shorts may also decide which ETF shares to lend. The lending desk knows which stocks are in high demand for shorting. That information could flow—even inadvertently—to the short fund's traders. The prospectus does not require a Chinese wall between the lending desk and the active management team.

Recent data from S&P Global Market Intelligence shows that the top five ETFs by assets each lent out roughly 10–15% of their portfolios in 2023. For the SPDR S&P 500 ETF (SPY), that meant about $40 billion in securities on loan at any given time. The revenue from lending is real: BlackRock reported $1.2 billion in securities lending revenue in 2023, up from $800 million in 2022. That revenue is shared with fund shareholders, typically keeping 60–70% for the fund and 30–40% for the lending agent. But the risk of loss—if a borrower defaults and the collateral falls short—is borne entirely by the fund.

The Three Ways Managers Exploit the Loophole

Securities lending is the most common method, but it is not the only one. Managers have at least three ways to profit from trading against their own funds.

Securities lending. As described, the fund lends shares to short sellers. The manager earns fees and splits them with the lending agent. The fund's returns are reduced by the performance drag from short selling, but the lending revenue partially offsets it. In years when short interest is high, the lending revenue can be significant—but the drag from falling stock prices can be larger. The net effect depends on the specific stocks lent and the timing of loans.

Derivatives overlay. Some ETFs use futures or swaps to gain exposure to an index. A manager might short index futures on the same index the fund tracks, creating a synthetic short position that hedges or speculates. This is disclosed in the prospectus under "derivative transactions" but rarely explained in plain language. For example, consider a commodity ETF that tracks the Bloomberg Commodity Index. The ETF holds futures contracts to replicate the index. The same asset manager may also run a hedge fund that shorts those same commodity futures to bet on price declines. If the hedge fund's short position is large relative to the ETF's long position, the hedge fund's trades could influence futures prices, affecting the ETF's returns. A 2021 study by the SEC's Office of the Investor Advocate examined the use of derivatives in ETFs and found that in some cases, the fund's derivative counterparties were affiliates of the manager, creating undisclosed conflicts. The study noted that the use of total return swaps allowed managers to create synthetic short exposure without borrowing shares, and the pricing of these swaps was sometimes opaque.

Cross-trading between affiliated funds. When one fund needs to sell a security and another affiliated fund wants to buy it, the manager can execute a cross-trade at a price that may be stale or advantageous to one side. The SEC permits cross-trades at the current market price, but if the price is based on the last trade rather than a real-time quote, one fund gets a slightly better deal. This is particularly common in fixed-income ETFs, where prices are less transparent. A 2021 study by the SEC's Office of the Investor Advocate found that cross-trades in bond ETFs often occurred at prices that deviated from contemporaneous market quotes by several basis points. For instance, a corporate bond ETF might cross-trade a bond with an affiliated high-yield fund at a price that favors the high-yield fund by a few basis points. Over many trades, this can shift value from one fund's shareholders to another's. The study analyzed over 10,000 cross-trades in 2020 and found that the average deviation was 3.2 basis points, with some trades deviating by more than 10 basis points. While each deviation is small, the cumulative effect over time can be significant.

Each of these methods is disclosed somewhere in the prospectus—in footnotes, risk factors, or appendices. None is described in a way that an average investor would understand as "the manager can bet against your holdings." The cumulative drag on returns from these practices is estimated by some industry analysts at 0.2–0.5% annually, depending on the fund and market conditions.

Vanguard, BlackRock, and the Fine Print Arms Race

The three largest ETF issuers—BlackRock, Vanguard, and State Street—have been competing on expense ratios for years, driving fees toward zero. Securities lending revenue has become a crucial part of the business model. It allows these firms to offer low-cost funds while still making a profit. But the fine print reveals an arms race in how aggressively they can lend.

Vanguard's prospectus for its flagship Total Stock Market ETF (VTI) includes a lending limit of one-third of the fund's assets. That is a high ceiling: if fully utilized, $1.5 trillion in assets could be lent out. In practice, Vanguard's lending program is more conservative, but the prospectus gives the manager wide latitude. BlackRock's iShares ETFs do not disclose a specific cap; instead, they state that lending will be "subject to board oversight" and "consistent with the fund's investment objective." State Street's SPDR ETFs, including SPY, allow lending without any stated cap on the percentage of assets that can be lent, and they can reinvest cash collateral in short-term instruments that carry their own risks.

In 2023, all three firms reported record securities lending revenue. BlackRock's $1.2 billion was a 50% increase from 2021. Vanguard's lending revenue was $700 million, up from $500 million. State Street's Global Advisors division reported $400 million. Much of this revenue came from ETFs that track broad market indices—the very funds that investors buy for low-cost, hands-off exposure. The revenue sharing means that fund shareholders get some of that money back, typically in the form of slightly lower expenses. But the risk is asymmetrical: the fund bears the credit risk if a borrower defaults, and the manager earns fees regardless of fund performance.

This is not a secret. The SEC requires disclosure of securities lending policies in the statement of additional information (SAI), a document that accompanies the prospectus. But few investors read the SAI, and even fewer understand the implications. The fine print has become a competitive tool: firms that lend more aggressively can offer lower headline expense ratios, attracting more assets. The investor who chooses a fund based solely on the expense ratio may be picking a fund that lends more of its portfolio, exposing them to greater conflict risk.

The Academic Study That Quantified the Damage

How much does this actually cost investors? A 2022 paper in the Journal of Finance by Aggarwal, Saffi, and Sturgess examined over 2,000 US equity ETFs over a ten-year period ending in 2019. They found that securities lending reduced annual returns by an average of 0.15%. But that average masked wide variation. In years when short interest was high—such as 2008 and 2009—the drag was larger. The worst-case funds lost 0.8% per year due to lending.

The mechanism is straightforward: when a stock is heavily shorted, its price tends to underperform. If the ETF lends that stock, it amplifies the shorting activity, contributing to the underperformance. The lending fee the fund earns is typically a fraction of the price decline. The paper also found that ETFs with higher lending revenue tended to have higher expense ratios, suggesting that managers were using lending revenue to subsidize fees rather than pass all savings to investors.

The compounding effect is what matters for long-term investors. A 0.15% annual drag over 20 years reduces a $10,000 investment by about $300 in real terms. A 0.8% drag reduces it by nearly $1,500. For a retiree with a $1 million portfolio, the difference could be tens of thousands of dollars. The paper's authors noted that the drag is concentrated in funds that lend the most, and that investors have little way to predict which funds will lend heavily.

Some industry defenders argue that securities lending is a net benefit because it increases market liquidity and allows short sellers to correct overpriced stocks. That may be true for the market as a whole, but for the individual ETF holder, the benefit is indirect and the cost is direct. The fund's lending revenue is shared, but the price impact of short selling is borne entirely by the fund's NAV. The manager's incentive to maximize lending revenue is not aligned with the shareholder's incentive to maximize long-term returns.

What a Contract-Aware Investor Can Actually Do

Investors who want to avoid this conflict have several options, though none is perfect. The first step is to read the prospectus—or at least the SAI—for any ETF you own or are considering. Search for the terms "securities lending," "cross-trade," and "derivative transactions." Look for a cap on lending as a percentage of assets. Funds that explicitly limit lending to 25% or less are more conservative. Vanguard's international ETFs, for example, often have lower lending limits than its US funds.

Second, check the fund's lending revenue as a percentage of its expense ratio. This figure is reported in the fund's annual report under "securities lending income." If lending revenue is more than half of the expense ratio, the fund is relying heavily on lending to keep fees low. That fund may be more aggressive in its lending practices. Third, avoid funds where the same manager also runs active short strategies or hedge funds. This information is in the fund's statement of additional information under "conflicts of interest."

For large taxable holdings, consider separately managed accounts (SMAs) that hold individual stocks directly. SMAs do not lend shares unless you specifically authorize it, and you can negotiate the terms. The trade-off is higher fees and more complexity. For most investors, the simplest solution is to choose ETFs from issuers that have a reputation for conservative lending practices. Vanguard, for example, has historically been less aggressive than BlackRock or State Street, though its recent prospectus changes suggest it is competing harder.

None of these steps eliminates the conflict entirely. The structure of the ETF industry is built on revenue from lending and other ancillary activities. Even the most conservative funds engage in some lending. The key is to be aware of the trade-off: a slightly higher expense ratio may be worth it if it means less lending and fewer conflicts. This is not a call to abandon ETFs—they remain a powerful tool for diversified investing. But it is a call to read the fine print and understand the trade-offs involved.

This article is for informational purposes only and does not constitute personalized investment advice. The considerations discussed are general in nature and may not be suitable for your specific financial situation. Consult a qualified financial professional for advice tailored to your circumstances.