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The securities lending business boils down to one concept: exchanging a security that someone needs for a different security or cash. The business is driven by the need of the dealer community to cover short positions, be it in stocks, Treasurys, agencies, corporate bonds, ADRs, or even ETFs. When a dealer is looking to cover a short position, they first check what are colloquially known as the “sec lenders.” The securities lending group will pull the security out of the end-user portfolio and lend it into the Repo market. When a securities lending group loans a security, they either receive cash or bonds in return. If they receive cash, they reinvest the cash. If they receive a bond, they earn a fee on the spread between where they loan the bond and borrow the other. In the case of cash, they need to invest it. They need an investment that generates a sufficient return to make the business viable, yet, at the same time, without taking too much risk. The safest and easiest way to invest is in overnight Treasury repo. The problem is that there’s very little profit lending a Treasury and reinvesting in a Treasury. In order to enhance returns, the securities lending groups take some risk. It’s not necessarily a lot of risk, but increasing returns involves increasing risk. It can be either interest rate risk, credit risk, or liquidity risk. Technically a combination of all three is possible, too, but that’s pretty dangerous. The yield curve is upward sloping most of the time, so investing for a longer period of time generally generates a higher yield. Let’s say the overnight rate is 2.00%, the one-month rate is 2.05%, and the three-month rate is at 2.15%. Instead of reinvesting cash overnight, there’s an extra 15 basis points for investing for three months. Since the end-investor clients usually hold their bonds to maturity, there’s only a small chance they will sell a bond during that three-month period. On top of that, the securities lending groups run multi-billion dollar portfolios, so they can ladder their investments.
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Scott E.D. Skyrm (The Repo Market, Shorts, Shortages, and Squeezes)