- May 27 - Free - 13,926,173 breached accounts
- May 23 - Operation Endgame 2.0 - 15,436,844 breached accounts
- May 22 - Fédération Francaise de Rugby - 281,977 breached accounts
- May 08 - OnRPG - 1,047,640 breached accounts
- May 01 - TehetségKapu - 54,357 breached accounts
- May 28 - Global high-performance proof-of-stake blockchain with erasure coding
- May 28 - Show HN: Connecting People Through AI-Powered Video Sentiment Matching
- May 28 - Show HN: AutoThink – Boosts local LLM performance by 43% with adaptive reasoning
- May 28 - Theory of Stupidity [pdf]
- May 28 - Using Postgres pg_test_fsync tool for testing low latency writes