Stocks making the biggest moves after hours: ON Semiconductor, Upwork, Chegg and more

Check out the companies making headlines after hours. ON Semiconductor — The semiconductor supplier dropped nearly 6% after posting fourth-quarter revenue of $1.53 billion, missing the LSEG consensus estimate of $1.54 billion. On the other hand, earnings of 64 cents per share, on an adjusted basis, topped the forecasted 62 cents per share. Upwork — Shares of the online marketplace for freelancers tumbled 22% after the company disclosed active clients at the end of 2025 was 785,000, down from 832,000 at the end of the prior year. Upwork also posted current-quarter revenue guidance in the range of $192 million to $197 million, below the $201 million consensus estimate from LSEG. Current-quarter adjusted earnings guidance also missed estimates. Chegg — The online tutoring company dropped 5%, after posting fourth-quarter adjusted EBITDA of $12.9 million. That’s down from roughly $37 million in the year-ago period. Revenue of $72.7 million was down 49% year over year. Aecom — Shares of the construction engineering company gained about 3% after Aecom posted first-quarter earnings of $1.29 per share, on an adjusted basis, on revenue of $1.85 billion. That bested the earnings of $1.17 per share on revenue of $1.76 billion expected by analysts polled by FactSet. Cincinnati Financial — The property and casualty insurer dipped 1% even after posting fourth-quarter operating earnings of $3.37 per share, topping the FactSet consensus estimate of $2.90 per share.