Firms\u27 announcements to call in-the-money convertible securities for redemption essentially force their conversion into common stock, and such announcements are generally met with significant reductions in the calling firms\u27 equity values. An explanation based on liquidity costs is advanced and tested. The explanation implies that investors who choose to sell their shares early in the conversion period bear liquidity costs by selling at reduced prices. Consistent with the explanation, the average share price decline is short-lived, lasting most of the conversion period. Thus, a component of the call announcement effect appears to be due to liquidity costs
