Small stocks underperformed the rest of the market on Thursday for the second straight session, and helping things along was Smith Micro Software's ( SMSI) plunge. Jeffries cut the maker of wireless-communications software to hold from buy, sending shares down $3.02, or 15.3%, to $16.71. Boots & Coots International Well Control ( WEL), a Houston-based company that sells services to the oil and gas industry, offered 26 million shares at $2.10 apiece before underwriting discounts and commissions, half of which are being sold by the company itself. There's a 3.9-million-share underwriter's option in case of overallotment. Shares were losing 30 cents, or 12%, to $2.21. Maryland's TVI ( TVIN), which makes shelter systems and other products, plummeted 21.6% to $1.09 after saying Chief Executive Richard Priddy and Executive VP Charles Sample had both resigned from the company. Wireless-equipment maker KVH Industries ( KVHI) slid 9.1% to $8.67 after breaking even in the first quarter. Analysts polled by Thomson Financial were looking for a profit of 4 cents a share; a year ago, the Middletown, R.I., company made 8 cents a share. On the upside, North Carolina's PokerTek ( PTEK) surged 18.8% to $12 on word it will exclusively provide casino operator Harrah's Entertainment ( HET) with "live, player-banked, automated poker tables," pursuant to a "multi-year" deal. Harrah's recently lost 6 cents to $85.41.