Stocks to Watch: NextPower, Sellas, System1, Arteris

Dow Jones07:12

By Katherine Hamilton

NextPower raised its sales outlook and said it plans to make an acquisition to support its entry into the power-conversion industry. The stock gained 11% to $138.91 in after-hours trading Tuesday.

Sellas Life Sciences said one of its trials is close to being ready for a data review. The stock climbed 13% to $5.88 after the bell.

System1 said its revenue halved during the first quarter. Shares slid 27% to $3.25 in late trade.

Arteris raised its full-year revenue outlook. Shares rose 9% to $35.39.

Write to Katherine Hamilton at katherine.hamilton@wsj.com

(END) Dow Jones Newswires

May 12, 2026 19:12 ET (23:12 GMT)

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The stock gained 11% to $138.91 in after-hours trading Tuesday. \n\n\n  Sellas Life Sciences said one of its trials is close to being ready for a data review. The stock climbed 13% to $5.88 after the bell. \n\n\nSystem1 said its revenue halved during the first quarter. Shares slid 27% to $3.25 in late trade. \n\n\n  Arteris raised its full-year revenue outlook. 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