Someone made a compilation of academic reviews and blogposts here: https://community.signalusers.org/t/wiki-overview-of-third-party-security-audits/13243 but none of them seem to be real security audit reports, ex. compare with real security audits to Delta Chat: https://delta.chat/en/help#security-audits
This was first published in 2021. There are some interesting points made.
https://dessalines.github.io/essays/why_not_signal.html
It has had a few updates since, then but I cannot vouch for its accuracy.
It doesn’t cover audits per sé, but I feel there is important information that is tangentially related, since security audits become kind of moot if some of the items mentioned are true (i.e. CIA funding and US govt. tactics).
Full disclosure, I still use Signal for a family group chat. I have very little economic value, thus my threat model is minimal. It mentions cats several times. I neither have cats, nor interact with them frequently enough to warrant their inclusion in a threat model.
Right, always this link to show that signal isn’t trustworthy and then lists “good alternatives” that are either less secure or less usable