United States · Investor

Mason Wells

Filed with the SEC to raise a fund in Oct 2026, closing $833M. Last cheque observed Sep 2010.

QuietNew fund $833M, Oct 2026Private equity

SeedSeries ASeries BSecurityTherapeuticsBiotechnology

Cheques on record
0%of best year0cheques in 12 months, 2 on record
Since the last cheque5872days00hrs00min00sec
Median round$20MRounds led0 of 2
Pitch Mason Wells

Mason Wells highlights

  1. 01

    2 rounds on record

  2. 02

    Mostly Series A and Series B: 100% of its rounds

What they do

Filed 3 private fund offerings with the SEC, the most recent in 2020-05From their own website
Type
Private equity (from a list, unverified)
Cheque size
Not stated
Stages
SeedSeries ASeries BGrowth
Sectors
SecurityTherapeuticsBiotechnology
Based in
Milwaukee, United States
Cold pitches
Not stated

The record

Every round we can evidence, newest first2 appearances

  1. 2010

    1 round

  2. Sept
    OpGenSeries B · US · opgen.com$17MWith 4 others
  3. 2007

    1 round

  4. Sept
    OpGenSeries A · US · opgen.com$24MWith 4 others

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.

The team

Named by the firm itself, on a filing, its Form ADV or its company registration11 named

ASAsim S KhanExecutive OfficeriFiling they signed
BLBenjamin Lincoln HolbrookExecutive OfficeriFiling they signed
DFDeborah FigueroaCorporate SecretaryiForm ADV
GJGregory J MyersExecutive OfficeriFiling they signed
JSJames S. DomachVice President, Chief Financial Officer, Chief Compliance Officer and Assistant SecretaryiForm ADV
JJJay J. RadtkeExecutive Managing Director of the General PartneriFiling they signed
JLJohn L MartinExecutive OfficeriFiling they signed
JTJohn T ByrnesExecutive Officer, DirectoriFiling they signed
KPKevin P KenealeyExecutive OfficeriFiling they signed
TGThomas Gordon SmithChairman, President, and Chief Executive OfficeriForm ADV
WGWilliam G KruglerExecutive OfficeriFiling they signed

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.

What the register says

From the firm's own filings with the SEC, which it must file accurately by law

$1.4Bassets it managesOct 2026
Registeredinvestment adviserfull reporting to the SEC
Legal name
Mason Wells, Inc.
SEC number
CRD 173069

Funds on its Form ADV

6 private funds, $2.1B in gross assets · filed Mar 2024

  1. Mason Wells Buyout Fund IV, L.P.Private equity52 investors$1.3B
  2. Mason Wells Buyout Fund V, L.P.Private equity101 investors$686M
  3. MW Buyout Executive Fund IV, LLCPrivate equity69 investors$63M
  4. MW Buyout Executive Fund V, LLCPrivate equity87 investors$36M
  5. Mason Wells Buyout Fund III, L.P.Private equity32 investors$24M
  6. MW Buyout Executive Fund III, LLCPrivate equity63 investors$1.7M

Who they invest alongside

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.

Quick answers about Mason Wells

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.

How active is Mason Wells?

2 investments on record, 0 of them in the last 12 months. The most recent was in Sept 2010.

How big are Mason Wells's cheques?

The median round it joins is $20M.

Is Mason Wells investing now?

No investments in the last 12 months; the latest was in Sept 2010.

Who does Mason Wells invest alongside?

Most often CHL Medical Partners (2 rounds together), Highland Capital Partners (2 rounds together) and Versant Ventures (2 rounds together).

What kind of investor is Mason Wells?

Mason Wells is a private equity firm based in Milwaukee, United States.

How much does Mason Wells manage?

About $1.4B, as regulatory assets under management (Oct 2026).

Has Mason Wells raised a new fund?

Its latest fund filing with the SEC was in Oct 2026, reporting $833M raised.

Raising now?

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Built from the rounds we watched, its filings and its own website, refreshed every night. How we count · Report a correction · Is this your firm? Claim it