Hi Connie,
This isn't a company per se, but both AAMD and AAM have had pretty extensive salary surveys over the years, covering all museums positions. Sadly AAM's last was in 2017, they had a very high sample size. AAMD has stayed current with theirs, but has fewer participants. I did a thorough analysis in 2017 and found AAM's number 2% higher than AAMD's. So you could take AAMD's survey and add 2% as a starting point. I hope that helps you.
Matt
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Matthew Isble
Exhibit Designer & Founder of MuseumTrade.org
misble@crockerartmuseum.orgCrocker Art Museum
Sacramento CA
misble@crockerartmuseum.org------------------------------