An auction rate security (ARS) typically refers to a debt instrument with a long-term nominal maturity (20 or 30 years) for which the interest rate is reset through a Dutch auction. It could also refer to preferred stocks for which the dividend is reset through the same process; notably preferred stocks have no maturity date. In a Dutch auction, a broker-dealer submits bids to the auction-agent on behalf of current and prospective investors. Based on the submitted bids, the auction agent will set the next interest rate by determining the lowest rate to clear the total outstanding amount of ARS.
Auction-rate securities were invented in 1988; and, until 2004, were classified as cash equivalents, since investors could redeem their securities at auctions held every seven, 28, or 35 days. In the beginning, ARS auction failure was rare, with most underlying bonds being issued by municipal and corporate entities rated at AAA or AA. (Auction failure occurs when supply of ARS outstrips demand.)
However, the ARS market, which had grown to well over $330 billion in 2007, had become more risky with the rise of preferred stock auction-rate securities issued by closed-end funds; these issues had reached 20% of the ARS market. At the same time (in late 2007), auction-rate securities had morphed from a product sold mainly to corporations to one marketed heavily to retail investors; minimum investments were dropped to $25,000 (with the average retail investment at $300,000). By the start of 2008, corporate investment had dropped to less than 30 percent of the ARS market.