I put together a list of companies that actually offer a real 4-day workweek (4 days, 8 hours each), not just compressed schedules or seasonal 4 day week. I made sure each company explicitly mentions this benefit on their website or in their job ads.

Some companies claim to have a 4-day workweek but either don't stick with it after trials or end up having a 4.5-day week. I didn't include those.

Most of these companies are hiring right now through their career pages and many are fully remote.