Cisco–Astrix and SailPoint–Entro both closed on 29 June, Okta–Permiso on 26 August and Cyera–Oasis on 3 September, and every one of them is about non-human or agent identity, which tells you where the money thinks the problem lives.
Only Cyera put a number on it ($1B); SailPoint said outright that terms were not disclosed. Any other figures floating about are reported, not confirmed, so file them under gossip.
Sources: Cisco · SailPoint · Okta 10-Q (SEC) · Cyera via Business Wire