I got into a discussion with someone last week regarding the “best price” concept as it applies to securities lending. It would seem to be an obvious and straightforward one, but never has been. Unlike a straightforward trade execution where the measurement is an absolute price in the context of the day’s trading range, securities lending pricing has other factors that influence the assessment.
While there are overriding risk issues such as legal, tax and operation that apply to stock loans, these are germane to the business and don’t have an influence on individual trade prices for comparative purposes. Counterparty risk and collateral management are two transaction-specific issues that have a direct impact on the assessment of whether “best price” has been achieved.
Counterparty Risk
Each market participant makes its own decision on the counterparties with which it will trade. There is no centralised or commonly agreed rating or ranking on counterparties, so it is an individual selection based on the credit analysis and judgement of its trading partners.
For example, Lender “A” may have a different view than Lender “B” as to the creditworthiness of Borrower “C”. Except with hindsight, there is no way to determine whether either or both views are correct.
Collateral Management
What is the purpose of collateral in stock loan transactions? It seems there are two broad approaches.
One is that collateral is to be used as a safety net in the event of a borrower default. The collateral is then liquidated and used to repurchase the stocks and bonds that were loaned out to the borrower. This approach suggests that securities are taken as collateral against securities on loan. Even here there are differing views. Some look at “AAA” rated government bonds as the best type of collateral. To the extent that they are unlikely to default, and are typically very liquid, there is merit to the argument. The other view is that in line with normal investment criteria, the key is correlation. That is to say that in order to replace a wide range of securities that are loaned to a given counterparty, the best collateral is to take a diversified portfolio that broadly resembles the securities on loan. In other words, a portfolio of international equities and bonds is best collateralised by another basket of international equities and bonds. The values of the portfolio on loan and the collateral portfolio should move in similar directions in terms of total value.
The second approach carries the same underlying purpose of asset replacement protection, but adds in the potential for enhanced returns. This extra performance is achieved by taking cash collateral which is in turn used to buy money market instruments. In essence, the purchase of additional securities adds an element of leverage to the portfolio and adds incremental risk to the transaction. Hopefully it also adds additional income. Since this entails an actual investment transaction, the caveat that prices go up as well as down, and that historical performance is not necessarily a guide to the future is appropriate. Making this decision requires investigation and analysis to ensure that one understands the pitfalls.
Summary
Best price is not something that can practically be achieved in the context of a mulit-layer risk transaction like securities lending. The best anyone can hope for is a meaningful discussion and analysis of revenue attribution and the risks pertain while achieving the income.
Sorry, I wish there was a more straightforward answer. Do you agree/disagree? Let me have your comments on this issue.
P.S.
The Dutch regulator AFM has announced that the short selling ban on financial stocks, including insurers will expire on 1 June.

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