# Siemens acquires Altair Engineering revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Acquisition: [Siemens acquires Altair Engineering](/acquisitions/siemens-acquires-altair-2024.md)

_No events on file. Arc G is forward-only; the recorded event log accrues from Arc G adoption (2026-06-04). For the current state of this acquisition, see the acquisition page._

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /acquisitions/siemens-acquires-altair-2024/history. REST: /v1/acquisitions/81332f80-d827-4f45-aed1-29d7a27e655d/history. HTML: [/acquisitions/siemens-acquires-altair-2024/history](/acquisitions/siemens-acquires-altair-2024/history)._