After-Hours Movers | Roblox Surges 11%; Reddit Jumps 4%; Fortinet Gains 3%; IREN Tumbles 20%; Microchip Sinks over 7%; Affirm Drops about 6%

Videogame platform Roblox reported a huge increase in fourth-quarter revenue. But the bigger news was its surge in bookings, daily average users, and hours engaged on its platform, all of which beat Wall Street estimates. Shares rose 11.44% in after-hours trading.

Reddit forecast first-quarter revenue above analysts' estimates on Thursday, as artificial intelligence-powered enhancements to its ad platform help the social media platform draw more marketers.

Shares of the company rose 4% after-hours as Reddit also announced its maiden share repurchase plan of up to $1 billion.

Affirm shares fell 5.8% despite it recorded a 30% increase in sales in its fiscal second quarter. The buy now, pay later company on Thursday posted a net income of $7.45 million, or 37 cents a share, in the quarter-ended Dec. 31, compared with a loss of $38.4 million, or 23 cents a share, a year earlier.

Iren reported fiscal Q2 net loss late Thursday of $0.52 per diluted share, wider than a loss of $0.10 a year earlier. Analysts polled by FactSet expected a net loss of $0.11. Total revenue for the quarter ended Dec. 31 was $184.7 million, up from $116.1 million a year earlier. Shares of IREN tumbled 19.7% in after-hours trading.

Chipmaker Microchip Technology forecast fourth-quarter profit below Wall Street estimates on Thursday, raising concerns about the impact of a memory-supply crunch on the wider semiconductor industry.

Shares of the Chandler, Arizona-based company fell more than 7% in extended trading.

Fortinet forecast fiscal 2026 revenue above Wall Street expectations on Thursday, signaling strong enterprise spending on its cybersecurity services amid growing online threats, sending its shares up around 3% in extended trading.