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Early movers: TRV, GM, LUV, UA, DHI, AXP & more
Michael Nagle | Bloomberg | Getty Images. These are the stocks posting the largest moves before the bell. · CNBC

Check out which companies are making headlines before the bell:

Travelers (NYSE: TRV) — The insurer earned $2.30 per share for the first quarter, missing estimates of $2.55 a share, but the miss was due entirely to casualty losses related to storms in Texas very late in the quarter. Revenue was above analysts' forecasts.

General Motors (NYSE: GM) — The automaker earned $1.26 per share for the first quarter, coming in 25 cents a share above estimates, while revenue was also well above Street forecasts. GM was helped by a more favorable sales mix, selling more of its higher profit margin SUVs and crossovers.

Southwest Airlines (NYSE: LUV) — The airline came in 4 cents above estimates with adjusted quarterly profit of 88 cents per share, while revenue also beat forecasts. Southwest was helped by lower fuel prices and the ongoing revamp of its jet fleet.

Under Armour (NYSE: UA) — The athletic apparel maker doubled estimates with quarterly profit of 4 cents per share, while revenue also beat Street estimates. Results were helped by strong apparel demand, as well as launches of new running and basketball shoes.

DR Horton (NYSE: DHI) — The home builder reported quarterly profit of 52 cents per share, 5 cents a share above estimates, while revenue also beat Street forecasts. The company also raised its profit margin guidance amid solid demand, with orders up 10 percent from a year ago.

PulteGroup (NYSE: PHM) — PulteGroup earned 24 cents per share for its latest quarter, 4 cents above estimates, with the home builder's revenue also exceeding forecasts. Net new orders were up 24 percent from a year earlier. Separately, founder Bill Pulte escalated his drive to oust CEO Richard Dugas, saying he would vote against the entire board at the home builder's annual meeting unless Dugas resigns immediately.

Stanley Black & Decker (NYSE: SWK) — The toolmaker came in 14 cents a share above estimates, with adjusted quarterly profit of $1.28 per share. Revenue beat estimates, as well. The company also raised its full-year forecast on stronger sales and a drop in restructuring costs.

American Express (NYSE: AXP) — The financial services giant reported quarterly profit of $1.45 per share, beating estimates by 10 cents a share. Revenue was slightly above expectations, as cardholder spending rose 6 percent.

Yum Brands (NYSE: YUM) — Yum earned an adjusted 95 cents per share for its latest quarter, 12 cents above estimates, with the restaurant chain's revenue essentially in line. The parent of KFC, Pizza Hut, and Taco Bell also raised its full-year profit outlook on faster sales growth.