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Updated from 11:22 a.m. EDT

Winners

21st Century Holding

(TCHC)

, a financial services company, reported first-quarter earnings of 33 cents a share, up from 15 cents in the same period a year ago. The stock was up 17% to $10.10.

Airborne

( ABF) was up 15% to $21.03 after the shipping company reported first-quarter earnings of 11 cents a share, including a gain of 2 cents. In the same quarter a year ago, the company lost 35 cents a share. According to First Call, analysts expected a loss of 9 cents in the latest quarter. Total revenue for the first quarter, which had one less operating day than the year-ago period, declined 4.3% to $789 million. Airborne is targeting 130,000 ground product shipments a day in the second quarter, with 10% to 15% sequential quarterly growth. The company continues to expect sequential quarterly growth of 3% to 5% in airborne@home shipments.

Building products maker

Emco Ltd.

(EMLTF)

was gaining 9% to $7.10 after posting first-quarter earnings of 21 cents a share, compared with a loss of 29 cents in the year-ago quarter. The company also raised its full-year earnings expectation to $1.05 to $1.20 a share from a prior estimated range of 80 cents to 90 cents.

HNC Software

( HNCS) was up 13% to $19.75 after

TheStreet Recommends

Fair Isaac

( FIC) agreed to acquire the company for $810 million in stock. Fair Isaac was down 9% to $58.24.

Prime Group Realty Trust

( PGE) was up 7% to $7.54 on news the company received an unsolicited cash-and-stock acquisition proposal from

American Realty Investors

(ARL) - Get American Realty Investors, Inc. Report

. Prime Group's board of trustees plans to address the proposal "promptly and in an orderly manner." American was up 3% to $8.95.

Tyson Foods

(TSN) - Get Tyson Foods, Inc. Class A Report

was climbing 7% to $13 after the company posted second-quarter earnings of 18 cents a share, reversing a loss of 3 cents in the year-ago period and matching estimates. Second-quarter sales jumped to $5.84 billion from $1.86 billion last year, thanks in part to the acquisition of

IBP

. The company expects third-quarter earnings of 24 cents to 28 cents a share and full-year earnings of $1.10 to $1.20. Analysts are looking for third-quarter earnings of 28 cents and a full-year profit of $1.14.

Losers

Specialty pharmaceutical outfit

Biovail

( BVF) was dropping 15% to $39.60 after Banc of America Securities downgraded the stock to a sell rating, citing worries about the quality of the company's financial statements, the valuation of its stock and its management's handling of a settlement with the Federal Trade Commission.

Edison Schools

(EDSN)

was sliding 23% to $5.60 after Merrill Lynch cut its long-term rating on the stock to buy from strong buy.

Lennox International

(LII) - Get Lennox International Inc. Report

plans to sell $100 million of convertible subordinated notes due 2009 in a private placement. The notes will be convertible into common stock. The company, which makes heating, ventilation and air conditioning equipment, will use the proceeds to repay part of the debt from its existing credit facility. Shares of Lennox were lower by 10% to $14.35.

Micro Therapeutics

( MTIX) was falling 16% to $5.89 after US Bancorp Piper Jaffray downgraded the stock to outperform from strong buy as a result of weak Onyx sales and sluggish enrollment in a U.S. aneurysm trial.

Storage Technology

(STK) - Get Columbia Seligman Premium Technology Growth Func Inc Report

was losing almost 9% to $20.63 after Goldman Sachs downgraded the stock to market perform from market outperform because of its valuation.

U.S. Laboratories

(USLB) - Get Invesco Russell 1000 Low Beta Equal Weight ETF Report

, a provider of quality control services to the construction, energy, public works and other industries, was losing 12% to $12.71 on the heels of the company's latest quarterly report. For the first quarter, U.S. Laboratories earned 16 cents a share, up from 14 cents in the year-ago quarter, but missing analysts' estimates by 3 cents.