SAN FRANCISCO (MarketWatch) — General Motors Co. rallied in after-hours activity late Monday on its expected re-inclusion into the S&P 500, while shares of G-III Apparel Group jumped after the apparel licenser raised its outlook for the year.

General Motors GM, -0.29% shares rose 3.6% to $35.65 in heavy volume after Standard & Poor’s said it was re-including the automaker in the S&P 500 SPX, -1.43% after a four-year absence. GM was removed from the S&P 500 in June 2009 after the automaker filed for bankruptcy protection.

G-III Apparel Group Ltd. GIII, -1.26% shares rose 7.6% to $46.00 after the company reported earnings of 5 cents a share on revenue of $272.6 million. Analysts expected a loss of 5 cents a share on revenue of $267.4 million.

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G-III, licensee for brands including Calvin Klein and Tommy Hilfiger, also raised it full-year outlook to a range of $3.20 and $3.30 a share from a previous $3.10 and $3.20 range. Analysts expect $3.20 a share.

SAIC Inc. US:SAI fell 2.2% to $14.52 a share in light volume after the government-services contractor posted earnings of 23 cents a share on revenue of $2.71 billion.

The company was expected to post first-quarter earnings of 25 cents on revenue of $2.58 billion, according to analysts surveyed by FactSet.

SAIC also forecast annual earnings of $1.16 to $1.33 a share on revenue of $10 billion to $10.7 billion. Analysts see $1.16 a share on revenue of $10.28 billion.

Verint Systems Inc. VRNT, -4.11% shares slipped 3.8% to $32.71 on light volume after the company reported adjusted quarterly earnings of 44 cents a share on revenue of $205.4 million, while analysts expected 52 cents a share on revenue of $203.4 million.

The data analysis firm forecast annual earnings of $2.70 to $2.80 a share. Analysts expected $2.76 a share.

Shares of ABM Industries Inc. ABM, +2.19% rose 4.1% to $25.60 after the facilities services provider reported quarterly earnings of 35 cents a share on revenue of $1.17 billion. Analysts expected 33 cents a share on revenue of $1.18 billion.

ABM also raised its annual adjusted earnings forecast to a range of $1.40 to $1.50 a share. Analysts expect $1.40 a share.

FedEx Corp. FDX, -2.37% shares dropped 0.9% to $96.81 in light volume after the shipper announced a dividend hike and plans to speed up the retirement of some aircraft.

Zynga Inc. ZNGA, +0.30% shares wobbled back and forth after hours. Shares were up 0.6% to $3.01 on heavy volume at last check. During the session, they dropped 12% after the social-media games maker said it would cut nearly a fifth of its work force.

Bristol-Myers Squibb Co. BMY, -0.72% and Merck & Co. MRK, -0.35% shares continued gaining in moderate volume after the closing bell.

2013 Cadillac made by General Motors. General Motors

Shares of Bristol-Myers advanced 0.6% to $47.85 in moderate volume. Shares gained 3.4% to close at $47.59 during the session.

Merck shares rose 0.3% to $48.61 in after-hours activity, after gaining 3.8% during the session.

Shares of both firms were on a roll following presentations made over the weekend at the American Society of Clinical Oncology.