TB Woods ( TBWC) skyrocketed 44.5% after the maker of industrial power transmission products agreed to sell itself to Altra Holdings ( AIMC) for $24.80 a share -- a 46% premium to Friday's closing price. The deal will likely close in April. Shares of Pennsylvania-based TB Woods were rising $7.57 to $24.57. Altra was up 15 cents, or 0.9%, to $16.55.

Cleveland's Lesco ( LSCO), which makes lawn care products, shot up by more than a third on news it will sell itself to farm-equipment maker Deere & Co. ( DE) in a $14.50-a-share deal that will probably close within the second quarter. Lesco shares were gaining $3.82 to $14.25. Deere was slipping 69 cents to $113.24.

In more acquisition news, food distributor Smart & Final ( SMF) said privately held Apollo Management will buy it for $22 a share, or about $812.9 million. As part of this venture, Apollo will buy out Smart & Final's majority shareholder, a subsidiary of France-based Casino Guichard-Perrachon, for a price to be determined by the amount of Smart & Final shares it owns at time of closing. The deal should close in the second quarter.

Los Angeles-based Smart & Final simultaneously reported plunging fourth-quarter profits of $5.1 million, or 16 cents a share, from $9.3 million, or 29 cents a share, a year ago. But shares were spiking $2.55, or 13.4%, to $21.61.

Las Vegas-based Empire Resorts ( NYNY) announced it had been cleared to build a "world-class casino" in upstate New York with its partner, the St. Regis Mohawk Tribe, the latter having received state approval to do so. Shares were up $1.92, or 19.2%, to $11.92.

Rock of Ages ( ROAC) posted fourth- quarter income from continuing operations of $1.5 million, or 20 cents a share, compared with $674,000, or 9 cents a share, a year ago. The Concord, N.H.-based company, which operates quarries for granite blocks used in cemeteries, also narrowed its full-year losses to $6 million, or 81 cents a share, compared with last year's $16.1 million, or $2.17 a share. Revenue for the quarter and year declined by 9% each, to $23.4 million and $81 million respectively. Shares were climbing 89 cents, or 20.2%, to $5.27.

Shares of Indiana's Brightpoint ( CELL) jumped after the wireless-products distributor said it will buy Denmark-based Dangaard Telecom. Brightpoint will issue 30 million new shares to pay for Dangaard, and expects the transaction to be accretive to earnings within the second full quarter following the deal's completion in June or July. Shares were up $1.34, or 13%, to $11.62.

Natus Medical ( BABY), which specializes in medical products for infants, reported soaring fourth-quarter revenue and flat profits that topped Street expectations. Excluding items, the San Carlos, Calif., company earned $2.9 million, or 13 cents a share, on $28.8 million in revenue. Last year's sales totaled $12.6 million. Analysts polled by Thomson Financial were seeking 12 cents a share on $28 million revenue. Shares were rising $1.58, or 10.8%, to $16.19.

Isonics ( ISOND) was higher on reshuffled management. The Golden, Colo.-based chemical developer said company founder, CEO and Chairman James Alexander is leaving to pursue other business interests. Christopher Toffales -- CEO of Isonics's 90%-owned surveillance-technology maker Senselt -- will serve as new board chairman; John Sakys, former chief financial officer, will serve as interim CEO and has been shifted to chief operating officer. Former director of financial reporting Kenneth Deane is replacing Sakys. Shares were up 14 cents, or 8%, to $1.90.

St. Louis-based Build-A-Bear Workshop ( BBW) was sinking after North American same-store sales slid 10.4% in the fourth quarter. The stuffed-animal retailer's overall revenue climbed 21.1% to $141.3 million, mostly from its 2006 acquisition of Britain-based The Bear Factory, but Wall Street was seeking $9.4 million more. Income came to $15.4 million, or 75 cents a share, which tops the 73-cent consensus, and represents a 44% per-share rise from last year. Still, shares were falling $3.27, or 10.7%, to $27.17.

Tefron ( TFR) was lower after the apparel maker reported an 8.7% decline in fourth-quarter operating income to $6.4 million. The Israel-based company said income from continuing operations more than doubled to $18.3 million, or 88 cents a share, largely due to sharply lower debt of $5.2 million, compared with $49 million a year ago. Sales rose 8.7% to $50 million. But shares were off 96 cents, or 9.5%, to $9.11.

Golden Star Resources ( GSS) will offer an as-yet-undetermined number of shares. The Littleton, Colo., gold miner plans to use the proceeds of the offering for a number of projects and for general corporate purposes. Shares were losing 31 cents, or 8%, to $3.55.

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