What does Mason Wells invest in?
Mason Wells invests most often at Series A and Series B (100% of the rounds on record), in sectors such as Security, Therapeutics and Biotechnology.

United States · Investor
Filed with the SEC to raise a fund in Oct 2026, closing $833M. Last cheque observed Sep 2010.
QuietNew fund $833M, Oct 2026Private equity
2 rounds on record
Mostly Series A and Series B: 100% of its rounds
Filed 3 private fund offerings with the SEC, the most recent in 2020-05From their own website
Every round we can evidence, newest first2 appearances
1 round
1 round
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
Named by the firm itself, on a filing, its Form ADV or its company registration11 named
We also hold 29 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
From the firm's own filings with the SEC, which it must file accurately by law
Funds on its Form ADV
6 private funds, $2.1B in gross assets · filed Mar 2024
The investors most often in the same rounds as Mason Wells. A count of rooms they were both in, not a relationship either has claimed.
Mason Wells invests most often at Series A and Series B (100% of the rounds on record), in sectors such as Security, Therapeutics and Biotechnology.
2 investments on record, 0 of them in the last 12 months. The most recent was in Sept 2010.
The median round it joins is $20M.
No investments in the last 12 months; the latest was in Sept 2010.
Most often CHL Medical Partners (2 rounds together), Highland Capital Partners (2 rounds together) and Versant Ventures (2 rounds together).
Mason Wells is a private equity firm based in Milwaukee, United States.
About $1.4B, as regulatory assets under management (Oct 2026).
Its latest fund filing with the SEC was in Oct 2026, reporting $833M raised.
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