Auction rate securities are long-term bonds or preferred shares whose rates reset through auctions, with liquidity depending on successful bids or a secondary sale.
Auction rate securities (ARS) are long-term or perpetual bonds and preferred shares whose interest rates or dividend rates reset through periodic auctions. Their coupons may reset every few weeks, but the securities themselves do not mature at each auction. An investor who wants to exit generally needs a successful sell order, a secondary-market buyer, an issuer redemption, or eventual repayment under the security’s terms.
This distinction is central: a short reset interval does not make ARS a cash equivalent. If an auction fails, the holder can remain locked into a long-dated or perpetual security even though a document-defined rate applies for the next period.
Auction procedures vary, but a simplified process includes:
The auction agent administers the stated procedure; it does not guarantee that enough buyers will participate. Program dealers can solicit orders and may submit bids for their own accounts, but investors should not assume they will support every auction.
Assume a series has 1,000 securities outstanding. Existing investors unconditionally hold 300 and offer 700 for sale. The auction receives these buy or hold-at-rate orders:
| Order | Quantity | Minimum acceptable rate |
|---|---|---|
| A | 200 | 3.0% |
| B | 300 | 3.4% |
| C | 250 | 4.0% |
The auction needs demand for all 700 securities offered. Orders A and B cover 500; another 200 from order C is needed. The simplified clearing rate is therefore 4.0%. Successful positions receive 4.0% for the next reset period, even if an investor bid at a lower rate.
Now assume order C is absent. Demand covers only 500 of the 700 securities offered. The auction fails. If the documents specify a 6.5% maximum rate in this situation, the coupon resets to 6.5%, but investors who submitted sell orders generally continue holding because the auction did not produce enough buyers.
The higher rate compensates the holder only according to the formula. It does not create a buyer, restore access to principal, or prevent the security’s market value from falling.
| Outcome | What happened | Rate for the next period | Liquidity implication |
|---|---|---|---|
| Successful auction | Sufficient orders clear all securities offered | Clearing rate | Accepted sell orders can be filled under allocation rules |
| All-hold auction | Existing holders all choose to retain their positions | Document-defined all-hold rate | No auction sale occurs because no holder offered securities |
| Failed auction | Demand is insufficient at or below the permitted maximum | Document-defined maximum or failed-auction rate | Some or all requested sales remain unfilled |
The maximum rate can be fixed, formula based, or linked to an index and issuer or security characteristics. It is not necessarily punitive enough to attract new buyers, and it can be capped below the rate the market would otherwise require.
| Feature | Auction rate security | Variable-Rate Demand Obligation | Floating-Rate Note |
|---|---|---|---|
| Rate reset | Auction clearing process | Remarketing or stated mode | Benchmark plus or minus a spread |
| Holder exit mechanism | Successful auction or secondary sale | Commonly a contractual tender or put, subject to documents and support | Secondary sale or maturity unless a put exists |
| Liquidity facility | Generally not the same standing feature as a VRDO put | Often supports tendered bonds | Not inherent |
| Main failure mode | Auction does not clear | Remarketing or liquidity provider fails under applicable terms | Credit spread, benchmark, or secondary liquidity changes |
Rate variability alone does not make these instruments economically interchangeable.
ARS historically included:
Tax treatment, credit support, redemption, maturity, maximum-rate formulas, and investor rights vary. A municipal ARS is not automatically federally tax exempt for every investor, and preferred shares are equity claims rather than debt.
ARS had often been marketed or understood as highly liquid because frequent auctions historically allowed investors to submit sell orders near par. In early 2008, widespread auctions failed when sell orders exceeded buy demand and dealers stopped or reduced support bidding. Many holders continued receiving interest or dividends but could not obtain principal through the auction process.
The episode demonstrated that auction liquidity was contingent on market participation. It also showed why a security can continue making contractual payments while becoming illiquid and trading below par.
An investor may be unable to sell through the auction. The available secondary market can be limited, especially after repeated failures.
The underlying security can remain outstanding for decades or indefinitely. A frequent reset does not create a frequent repayment right.
Issuer, borrower, collateral, insurer, guarantor, or fund performance can weaken. Auction failure and payment default are distinct, but both can affect value.
The failed-auction rate may be capped or linked to an index that does not compensate for credit and liquidity conditions. The formula can also impose high costs on the issuer.
Auction participation can depend heavily on a small group of broker-dealers. Past support bids do not create a continuing obligation unless documents say otherwise.
An issuer may redeem a series when doing so is favorable to the issuer. Partial redemptions can leave some holders invested and require allocation among positions.
Limited trades can make price estimates uncertain. Par auction history is not evidence that a current secondary-market sale is available at par.
This article provides general financial education, not individualized investment, tax, legal, or securities advice. The official statement, prospectus, auction procedures, and current market information control the rights and risks of a specific ARS.