DFX Intelligence

Sam Altman

Managing Director Of Hydrazine Capital Ii Gp, Llcat Hydrazine Capital II GP, LLC

As of 2026-10-01 · this person's identity; each section below carries its own date

Current roles: 5
Investments attributed: 2
Board seats: 2

Ask DFX about this View relationships Find contacts Investments Board seats

As of 2026-10-01 · this person's identity; each section below carries its own date

4 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.

What matters now

2020
since
Managing Director Of Apollo Projects Gp, Llc at Apollo Projects GP, LLC since 1 Jul 2020.
Tenure says how settled this partner is at the firm.
FactForm ADV Schedule A and the firm's team pageFor Founders, LPsRoles →

Relationship network

10 connected entities2 observed investment recordsinvestment records 2015 to 2021

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 SAM Altman connected to?

How am I connected?

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

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

Drawing the relationship network…

Roles

5 current, 2 past

Apollo Projects GP, LLC Managing Director Of Apollo Projects Gp, Llc
Jul 1, 2020 to present · “Schedule A: ALTMAN, SAM, MANAGING DIRECTOR OF APOLLO PROJECTS GP, LLC, since 07/2020, ownership E, control person Y”
Fact Form ADV
Hydrazine Capital III GP, LLC Director
Jul 1, 2014 to present · “Schedule A: ALTMAN, SAM, DIRECTOR, since 07/2014, ownership E, control person Y”
Fact Form ADV
Hydrazine Capital II GP, LLC Managing Director Of Hydrazine Capital Ii Gp, Llc
Jul 1, 2014 to present · “Schedule A: ALTMAN, SAM, MANAGING DIRECTOR OF HYDRAZINE CAPITAL II GP, LLC, since 07/2014, ownership E, control person Y”
Fact Form ADV

Investments attributed to this person

Company	Round	Investor	Attribution	Date	Source
Reddit	board only	Hydrazine Capital GP, LLC	strongly supported · board	Aug 26, 2021	Inference sec.gov
Helion Energy	board only	Hydrazine Capital GP, LLC	strongly supported · board	Jul 6, 2015	Inference sec.gov

Board seats and vehicles

2 boards, 2 vehicles

Reddit Director Aug 26, 2021 Inference
Helion Energy Director Jul 6, 2015 Inference
Openai Startup Fund Management, LLC Executive Officer May 24, 2023
Apollo Projects Spv-B, L.P. Promoter Aug 24, 2021

Timeline

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

Mar 29, 2024
SAM Altman (Member & Manager) no longer on Schedule A of Openai Startup Fund Management, LLC
Person left Inference Openai Startup Fund Management, LLC Form ADV
Aug 26, 2021
Board seat at Reddit (Hydrazine Capital GP, LLC)
Board seat Inference Reddit Form D
Jul 1, 2020
Joined Apollo Projects GP, LLC as Managing Director Of Apollo Projects Gp, Llc
Role began Fact Apollo Projects GP, LLC Form ADV
Mar 6, 2020
SAM Altman (Ceo; President Y Combinator Management, Llc) no longer on Schedule A of Y Combinator
Person left Inference Y Combinator Form ADV
Jul 6, 2015
Board seat at Helion Energy (Hydrazine Capital GP, LLC)
Board seat Inference Helion Energy Form D

Full timeline · 7 entriesnewest first

Mar 29, 2024
SAM Altman (Member & Manager) no longer on Schedule A of Openai Startup Fund Management, LLC
Person left Inference Openai Startup Fund Management, LLC Form ADV
Aug 26, 2021
Board seat at Reddit (Hydrazine Capital GP, LLC)
Board seat Inference Reddit Form D
Jul 1, 2020
Joined Apollo Projects GP, LLC as Managing Director Of Apollo Projects Gp, Llc
Role began Fact Apollo Projects GP, LLC Form ADV
Mar 6, 2020
SAM Altman (Ceo; President Y Combinator Management, Llc) no longer on Schedule A of Y Combinator
Person left Inference Y Combinator Form ADV
Jul 6, 2015
Board seat at Helion Energy (Hydrazine Capital GP, LLC)
Board seat Inference Helion Energy Form D
Jul 1, 2014
Joined Hydrazine Capital III GP, LLC as Director
Role began Fact Hydrazine Capital III GP, LLC Form ADV
Jul 1, 2014
Joined Hydrazine Capital II GP, LLC as Managing Director Of Hydrazine Capital Ii Gp, Llc
Role began Fact Hydrazine Capital II GP, LLC Form ADV

Record history

2 dated events on the change ledger, latest event first

Person left
2024-03-29source on record
Person left
2020-03-06source 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.