Securities Lending Explained: How It Works and What's Changing in 2026

Securities lending is the temporary transfer of a security — typically a stock or bond — from one party to another, in exchange for collateral and a fee. It sits quietly behind a lot of market activity that finance professionals interact with regularly: short selling, market-making, and settlement all depend on a working securities lending market, even though the mechanism itself rarely makes headlines. It is also, as of 2026, in the middle of its biggest regulatory overhaul in decades, which makes it a useful topic to actually understand rather than treat as back-office plumbing.

How a securities loan actually works

The mechanics are simpler than the name suggests. A lender — often a large institutional holder such as a pension fund or asset manager, acting through its custodian — temporarily transfers legal title of a security to a borrower, commonly a broker-dealer or hedge fund. In return, the borrower posts collateral worth more than the security's value (historically almost always cash, though this is changing, see below) and pays the lender a fee for the duration of the loan. The lender keeps the economic benefit of owning the security, such as dividend-equivalent payments, while the borrower gets the ability to deliver that security — most commonly to cover a short sale, but also to support market-making, settlement fails, or various arbitrage and financing strategies.

Why collateral flexibility just changed for the first time in 54 years

For decades, US broker-dealer securities lending collateral rules effectively meant cash was the default. That changed with a 2026 revision to SEC Rule 15c3-3, which for the first time in 54 years permits eligible equity collateral in certain securities lending transactions rather than requiring cash exclusively. This matters operationally: it gives borrowers and lenders more flexibility in how a loan is collateralised, but it also means finance and risk teams now need the infrastructure to value, monitor and manage equity collateral in addition to cash — a meaningfully different risk profile, since equity collateral can move in value alongside broader market stress in a way cash cannot.

Retail investors are entering the market too

Securities lending has traditionally been an institutional activity, largely invisible to individual investors even when their broker was lending out shares on their behalf under standard custody agreements. Canada's CIRO reforms, effective 27 April 2026, change that by enabling fully paid client securities and excess margin securities to be used in lending arrangements, provided proper client consent and disclosure are in place — allowing retail investors to participate in securities lending at scale for the first time. Expect similar retail-facing securities lending programmes, where brokers pass a share of lending revenue back to individual clients in exchange for consent, to keep expanding as the infrastructure and disclosure frameworks catch up.

Transparency is coming, just slowly

The other major regulatory thread is transparency. SEC Rule 10c-1a will require securities loans to be reported, with confirmed timelines now showing RNSA reporting beginning 28 September 2028 and public data dissemination starting 29 March 2029 — dates that have already been pushed back more than once since the rule was first proposed, reflecting how much operational build-out is involved. A related rule, 13f-2 (an amendment expanding Form SHO), has a compliance deadline of 2 January 2028, with the first filing due in February 2028 covering the January 2028 reporting period. Together these rules are the US equivalent of what Europe's Securities Financing Transactions Regulation (SFTR) already requires: giving regulators (and eventually the public) much better visibility into who is lending what, to whom, and at what rate — visibility that was largely absent from the US market until now.

How securities lending connects to other financing markets

Securities lending is one of a family of secured financing techniques that also includes repurchase agreements (repo) — both involve a temporary transfer against collateral, though repo is structured as a sale-and-repurchase of the underlying security rather than a loan of it, and cash is typically what moves rather than the security itself being the object being financed. Both markets also intersect with money market funds, which are often on the lending side of securities lending programmes as a way to generate incremental yield on their holdings, and both raise the same underlying question covered in our piece on counterparty risk: what happens if the other side of the transaction fails before it unwinds.

FAQ

Is securities lending the same as a repo?
No, though they are closely related secured-financing techniques. A repo is structured as a sale of a security with an agreement to repurchase it later, typically used to raise cash against collateral. A securities loan is structured as a loan of the security itself, most often used to enable a short sale or cover a settlement need.

Do individual investors get paid when their shares are lent out?
Increasingly, yes, where brokers offer dedicated securities lending programmes with client consent and revenue-sharing — a trend regulatory reforms like CIRO's 2026 changes are specifically designed to expand.

Why does securities lending transparency matter?
Regulators want better visibility into short-selling and financing activity across the market, which the new US reporting rules and Europe's existing SFTR regime are both designed to provide, even though the US rollout timeline stretches out to 2028–2029.

Securities financing activity is one of the five priority areas in the FSB's non-bank financial intermediation reform agenda, specifically around standardising margining and haircut frameworks to dampen procyclicality.

Topics like this are part of building genuine depth in market financing and risk — see Learnsignal's CPD courses for finance professionals looking to formalise that knowledge.

Regulatory requirements around short selling, including the UK's reformed short selling disclosure regime under FCA PS26/5, directly shape demand for borrowed securities and how prime brokers track client short activity.

Hedge funds typically access securities lending for short sales through their prime broker, which bundles borrowing, financing, and custody into a single consolidated relationship rather than requiring the fund to source borrows independently.