DFX Intelligence

Brian G. Atwood

Managing Member, Versant Venture Management, Llcat Versant Venture Management, LLC· CA

As of 2026-09-23 · this person's identity; each section below carries its own date

Current roles: 5
Investments attributed: 10
Board seats: 6

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As of 2026-09-23 · this person's identity; each section below carries its own date

5 additional roles and seats, 7 additional attributed investments

Every relationship, signal and contact on this record, with the source on each.

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

Nothing material in the last 365 days.

Relationship network

8 connected entities10 observed investment records6 dated investment records shown here, 2009 to 2025

From the roles sources name this person in, the investments a source attributes to them, and the boards and funds Form D names them on.

Some relationships on this record are counted rather than named here. They open with the full profile.

Click any name or line for the investment records and sources behind it. Line weight is investment records together; dashed lines are inferred.

Reading the network

Organization
Company
Fund or vehicle

›How strength and recency are read

Venture relationships are not scored. Each line names its claim: a round led or joined, a board seat or a filing that names the firm, a listing on a portfolio page (dated by when DFX saw it, never by when the investment was made), a disclosed LP commitment, or a co-investor pair counted from observed participations. Observed means a named source says so; Derived means DFX counted it from observed rows; Inferred means a match that may be wrong.

Darker lines were active in the last 24 months or are current; lighter lines are older or undated.

Ask DFX about this network

Which companies and boards is Brian G. Atwood connected to?

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Brian G. Atwood: a shared portfolio company or board, a prior employer, a co-investor, a shared LP or service provider. Every step is a filed or published record with its source; none is a guess about who knows whom.

See how you connect to Brian G. Atwood

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

Drawing the relationship network…

Roles

5 current, 0 past

Versant Venture Management, LLC Managing Member, And Trustee Of Atwood- Iv, Llc
Jul 1, 2008 to present · “Schedule A: ATWOOD, BRIAN, G., MANAGING MEMBER, AND TRUSTEE OF ATWOOD- IV, LLC, since 07/2008, ownership A, control person Y”
Fact Form ADV
Versant Venture Management, LLC Managing Member, And Trustee Of Atwood-Edminster Trust Dtd 4/2/2000, Versant Ventures Iv, Llc
Jul 1, 2008 to present · “Schedule A: ATWOOD, BRIAN, G., MANAGING MEMBER, AND TRUSTEE OF ATWOOD-EDMINSTER TRUST DTD 4/2/2000, VERSANT VENTURES IV, LLC, since 07/2008, ownership A, contro”
Fact Form ADV
Versant Venture Management, LLC Managing Member Of Stonehelm Llc, Versant Ventures Iii, Llc
Nov 1, 2005 to present · “Schedule A: ATWOOD, BRIAN, G., MANAGING MEMBER OF STONEHELM LLC, VERSANT VENTURES III, LLC, since 11/2005, ownership B, control person Y”
Fact Form ADV

Investments attributed to this person

Company	Round	Investor	Attribution	Date	Source
Cero Therapeutics Holdings, Inc.	board only	Versant Venture Management, LLC	strongly supported · board	May 6, 2025	Inference sec.gov
Phaserx Inc	Form D equity offering · $1.6M	Versant Venture Management, LLC	strongly supported · board	Jul 6, 2012	Inference sec.gov
Phaserx Inc	Form D equity offering · $3.6M	Versant Venture Management, LLC	strongly supported · board	Feb 14, 2012	Inference sec.gov

Board seats and vehicles

6 boards, 1 vehicle

Cero Therapeutics Holdings, Inc. Director May 6, 2025 Inference
Phaserx Inc board seat on a deal Jul 6, 2012 Inference
Groove Biopharma Corp board seat on a deal Dec 20, 2011 Inference
Versant Side Fund II, L.P. Director Mar 23, 2012

Timeline

5 dated entries: events, attributed deals, board seats and role changes

May 6, 2025
Board seat at Cero Therapeutics Holdings, Inc. (Versant Venture Management, LLC)
Board seat Inference Cero Therapeutics Holdings, Inc. Form D
Jul 6, 2012
Form D equity offering in Phaserx Inc (Versant Venture Management, LLC)
Attributed investment Inference Phaserx Inc Form D
Feb 14, 2012
Form D equity offering in Phaserx Inc (Versant Venture Management, LLC)
Attributed investment Inference Phaserx Inc Form D
Jul 1, 2008
Joined Versant Venture Management, LLC as Managing Member, And Trustee Of Atwood- Iv, Llc
Role began Fact Versant Venture Management, LLC Form ADV
Nov 1, 2005
Joined Versant Venture Management, LLC as Managing Member Of Stonehelm Llc, Versant Ventures Iii, Llc
Role began Fact Versant Venture Management, LLC Form ADV