I love reading these but I often forget where I have saved them and then spend ages looking for them. So this is just my online place to keep the recent important ones handy.
Most are links to the direct in-browser or PDF version for simple access. Where there is a registration I point to that page and not to the post registration link to respect the document owners release method.
Mandiant M-Trends Report
2023: Still behind a sign-up-wall https://www.mandiant.com/m-trends
Blackberry Global threat intelligence report
FBI Internet Crime Report
NCC Group Threat Monitor
2023 (I think) its online and flickery but ok: https://www.trendmicro.com/vinfo/us/security/research-and-analysis/threat-reports/roundup/annual-trend-micro-email-threats-report
Great Report resource
Threat Miner (click on the Reports tab): https://www.threatminer.org/
These require registration to see the report 🙁