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A Structured Investment Vehicle is a special-purpose entity that borrows money at short-term interest rates and invests it in longer-term, higher-yielding securities. The profit is the spread between the low borrowing cost and the higher investment return. Citibank created the first one, called Alpha Finance Corporation, in 1988, and the model spread across the banking industry over the next two decades. By mid-2007, approximately 36 SIVs held assets exceeding $400 billion. By October 2008, none remained active.
Think of an SIV like a bank that borrows overnight to fund 10-year mortgages: the strategy works well as long as short-term funding remains available.
SIVs raised capital from equity investors and then issued commercial paper and medium-term notes at short-term interest rates. They used those proceeds to buy long-term assets, primarily securitized products like mortgage-backed securities, asset-backed securities, and corporate bonds. The net credit spread between what the SIV paid on its short-term liabilities and earned on its long-term assets flowed back to investors.
Banks kept SIVs off their balance sheets, which meant the SIV's assets and liabilities did not appear in the bank's regulatory capital calculations. This allowed banks to generate fee income from structuring and managing SIVs without committing their own capital.
The SIV model had a fatal structural weakness: it depended on the continuous ability to roll over short-term borrowings. When credit markets seized in summer 2007 following concerns about subprime mortgage losses, the commercial paper market shut down for many structured products. SIVs could no longer issue new short-term notes to repay maturing ones.
Simultaneously, the long-term assets they held, particularly mortgage-backed securities, fell sharply in value. SIVs faced a simultaneous funding crisis and asset value collapse. Most were either restructured or wound down. In October 2008, Sigma Finance, the last surviving SIV, entered liquidation.
Post-crisis reforms made it effectively impossible to re-create the classic SIV structure. The Financial Accounting Standards Board changed the rules governing off-balance sheet treatment of special purpose entities, requiring genuine economic independence between the bank and the vehicle. Under the post-Enron consolidation rules further tightened after 2008, banks were required to bring SIV assets back onto their balance sheets. This eliminated the off-balance sheet capital advantage that made SIVs appealing in the first place.
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