As Gamesindustry.biz (opens in new tab) notes, CD Projekt Red's share price peaked in late August with a market cap of 42.4 billion Polish złoty, which is about $US10.7 billion. The individual share price was just under 461 złoty per share, or $US116.50. Subsequently, the studio instituted mandatory extra hours (opens in new tab) to complete work on Cyberpunk 2077, and then announced a delayed release date (opens in new tab). The share price dropped to 331 złoty, and is currently at 335 złoty, which is about $US85.
I'd already forgotten there was a Witcher-themed augmented reality game in the vein of Pokemon Go (opens in new tab) announced in August, but that announcement coincided with the studio's share price peaking. The Cyberpunk 2077 hype obviously helped, and I suspect the idea of a new mobile game based on the Witcher wouldn't have seemed as appealing to investors before the Netflix show made it a household name.
CD Projekt Red's stock fell earlier this year when the impact of the Covid pandemic became obvious, rallying after president and co-CEO Adam Kiciński explained they already had another big singleplayer RPG (opens in new tab) with a "relatively clear concept" in the works, widely assumed to be the next game in the Witcher universe (opens in new tab).