DFX Intelligence

Greg Johnson

Memberat Prolog Ventures Lcf, LLC· MO

As of 2026-09-12 · this person's identity; each section below carries its own date

Current roles: 3
Investments attributed: 3
Board seats: 1

Ask DFX about this View relationships Find contacts Investments Board seats

As of 2026-09-12 · this person's identity; each section below carries its own date

2 additional roles and seats

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. Last change: 7 Jun 2013, Latest Singulex Form D equity offering ($12.2M) on 7 Jun 2013.

Relationship network

7 connected entities3 observed investment recordsinvestment records 2011 to 2013

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.

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Which companies and boards is Greg Johnson connected to?

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Greg Johnson: 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 Greg Johnson

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

Drawing the relationship network…

Roles

3 current, 2 past

Prolog Ventures Lcf, LLC Member
Dec 1, 2018 to present · “Schedule A: JOHNSON, GREG, MEMBER, since 12/2018, ownership NA, control person N”
Fact Form ADV
Prolog Ventures II, LLC Managing Director
Mar 1, 2004 to present · “Schedule A: JOHNSON, GREG, MANAGING DIRECTOR, since 03/2004, ownership C, control person Y”
Fact Form ADV
Prolog Ventures, LLC Managing Director
Jan 1, 2000 to present · “Schedule A: JOHNSON, GREG, MANAGING DIRECTOR, since 01/2000, ownership C, control person Y”
Fact Form ADV

Investments attributed to this person

Company	Round	Investor	Attribution	Date	Source
Singulex Inc	Form D equity offering · $12.2M	Prolog Ventures, LLC	strongly supported · board	Jun 7, 2013	Inference sec.gov
Singulex Inc	Form D equity offering · $15.3M	Prolog Ventures, LLC	strongly supported · board	Mar 15, 2012	Inference sec.gov
Singulex Inc	Form D equity offering · $7.5M	Prolog Ventures, LLC	strongly supported · board	May 23, 2011	Inference sec.gov

Board seats and vehicles

1 board, 1 vehicle

Singulex Inc board seat on a deal Jun 7, 2013 Inference
Prolog Capital IV, L.P. Director Jul 24, 2013

Timeline

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

Mar 27, 2023
Greg Johnson (Managing Director) no longer on Schedule A of Prolog Ventures Hl II, LLC
Person left Inference Prolog Ventures Hl II, LLC Form ADV
Mar 27, 2023
Greg Johnson (Managing Director) no longer on Schedule A of Prolog Ventures Hl, LLC
Person left Inference Prolog Ventures Hl, LLC Form ADV
Dec 1, 2018
Greg Johnson joined Schedule A of Prolog Ventures Lcf, LLC as Member
Person joined Fact Prolog Ventures Lcf, LLC Form ADV
Dec 1, 2018
Joined Prolog Ventures Lcf, LLC as Member
Role began Fact Prolog Ventures Lcf, LLC Form ADV
Jun 7, 2013
Form D equity offering in Singulex Inc (Prolog Ventures, LLC)
Attributed investment Inference Singulex Inc Form D

Full timeline · 9 entriesnewest first

Mar 27, 2023
Greg Johnson (Managing Director) no longer on Schedule A of Prolog Ventures Hl II, LLC
Person left Inference Prolog Ventures Hl II, LLC Form ADV
Mar 27, 2023
Greg Johnson (Managing Director) no longer on Schedule A of Prolog Ventures Hl, LLC
Person left Inference Prolog Ventures Hl, LLC Form ADV
Dec 1, 2018
Greg Johnson joined Schedule A of Prolog Ventures Lcf, LLC as Member
Person joined Fact Prolog Ventures Lcf, LLC Form ADV
Dec 1, 2018
Joined Prolog Ventures Lcf, LLC as Member
Role began Fact Prolog Ventures Lcf, LLC Form ADV
Jun 7, 2013
Form D equity offering in Singulex Inc (Prolog Ventures, LLC)
Attributed investment Inference Singulex Inc Form D
Mar 15, 2012
Form D equity offering in Singulex Inc (Prolog Ventures, LLC)
Attributed investment Inference Singulex Inc Form D
May 23, 2011
Form D equity offering in Singulex Inc (Prolog Ventures, LLC)
Attributed investment Inference Singulex Inc Form D
Mar 1, 2004
Joined Prolog Ventures II, LLC as Managing Director
Role began Fact Prolog Ventures II, LLC Form ADV
Jan 1, 2000
Joined Prolog Ventures, LLC as Managing Director
Role began Fact Prolog Ventures, LLC Form ADV

Record history

3 dated events on the change ledger, latest event first

Person left
2023-03-27source on record
Person left
2023-03-27source on record
Person joined
2018-12-01source on record

The ledger records every merge, rename and reclassification this record went through and the dated filings observed on it, so the identity on this page can be traced to the records it was built from. The ledger's own sentences name other records, so they show with the names.