Edition-over-edition diff for the EFROS US AI Vendor Governance Index. Every change to a score, axis, or vendor inclusion is documented with effective date and rationale.
Vendor governance posture changes between editions. A BAA gets added. A SOC 2 Type II report lands. A vendor change of ownership shifts the subprocessor chain. An ISO/IEC 42001 certificate finally arrives. If the Index simply re-published quarterly without showing what moved, buyers couldn't tell whether a score change reflects vendor effort or methodology refinement. The changelog closes that gap — every score movement is dated, attributed to the vendor's public action, and linked back to the source that triggered the re-score.
Edition cadence
We publish quarterly. Material out-of-cycle changes — a new BAA, a new certification, a vendor change of ownership, a public model card revision — trigger a mid-quarter changelog entry but don't shift the headline edition number. The current edition is Q2 2026 — Inaugural Edition; the next edition is targeted for 2026-Q3.
Change types we record
added — vendor enters the universe (with rationale)
→Best-in-class composite: Abridge (healthcare, A grade) — only vendor with explicit HHS-OCR Section 1557 algorithmic non-discrimination engagement
→No vendor in the inaugural edition holds ISO/IEC 42001 attestation — the largest cross-category gap
→Sector-vertical vendors (legal, healthcare, banking) outperform foundation models on the composite because of sector-overlay weight amplification
→Upstart is the only vendor in the Index with a CFPB no-action letter history — uniquely deep fair-lending audit defensibility
Changes from previous edition
Inaugural edition — no prior baseline to diff against.
Want to challenge a scoring decision?
If a vendor's score doesn't match the most recent public evidence — a new BAA, a new certification, a documented policy change — email research@efros.com with the specific cell and the public source URL. We re-score and publish the change with the next quarterly edition (or as a mid-quarter changelog entry if the change is material).