Thursday's Small-Cap Winners & Losers

Smith Micro Software plummets.
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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) - Get Report

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) - Get Report

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.

Security-technology developer

MDI

(MDII)

, based in San Antonio, Texas, announced that the city's ABC news affiliate featured the company in a special on school security. Shares added 13.8% to $2.15 in recent trading. Meanwhile,

I-Flow

(IFLO)

jumped after two of its products -- ON-Q PainBuster and ON-Q SilverSoaker Antimicrobial Catheter -- yielded positive preliminary results in a trial evaluating the effects of the devices on surgical-site infections. Shares were trading up 13.2% to $16.50.

Connecticut-based

Playtex

(PYX) - Get Report

was 10.4% higher at $14.94 after the feminine-products maker bought out Hawaiian Tropic.

Ivanhoe Energy

(IVAN)

shot up 7.8% to $2.50 on word it will use its heavy-oil upgrading technology in order to jointly develop an Iraqi field with Inpex, if indeed the field is suitable.

And California's

Exponent

(EXPO) - Get Report

, which sells engineering consulting services, earned 31 cents a share in the first quarter -- a dime higher year over year and 8 cents past the sole analyst's estimate. Shares were leaping $1.81, or 8.8%, to $22.49.

The Russell 2000 Index gave up 0.5% to 820.32; the S&P SmallCap Index was off 0.3% at 422.06.