Hydrazine Capital GP, LLC

Micro VCSEC exempt reporting adviserClassification probable

Micro VC, reporting $28.1M of fund assets on its funds' Form ADV filings.

Composed from this organization's classification, location and filed figures.

Reported fund assets
$28.1M
sum of its funds' Form ADV filings, last 30 months
New companies, 12 mo
2
Investment team
2
Latest vintage
2015
Contact decision makers
More
Ask DFX about thisView relationshipsFind contactsInvestments (2)Team (2)Funds
As of · the latest observation of this organization; filed figures are as of its latest Form ADV

1 additional investment, fund or LP, 1 event, 1 verified contact (1 firm phone)

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

  1. 2 companies
    new in 12 months

    2 new companies in the last 12 months. Took 1 board seat on new Form D filings in 90 days (Antares Nuclear).

    A firm writing cheques this quarter is one a founder can pitch now.

    Factfunding announcements, Form D, the firm's portfolio pageFor Founders, co-investorsInvestments →
  2. 1 company
    portfolio raising

    One portfolio company has new financing on record in 6 months without this firm named on the round; the latest on 3 Aug 2026 ($60M sold on Form D).

    A portfolio company raising again is a follow-on decision for the firm and a co-investment opening for others.

    FactSEC Form D filingsFor Co-investors, LPs, lendersInvestments →

People to know

View all people
  • Sam Altman
    Managing Director Of Hydrazine Capital Gp, Llc
    Why: Managing director
    No route on file yet
  • Jack Altman
    Member Of Hydrazine Capital Gp, Llc
    Why: Named with investment responsibility
    No route on file yet

Relationship network

8 connected entities

From financing rounds and every investor named in them, Form ADV and Form D filings, the firm's funds and team, and disclosed LP commitments in the venture capital graph. A round's amount is the size of the round, not money that moved between two investors.

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

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

Reading the network
  • Company
  • Fund or vehicle
  • Person
›How strength and recency are read

Co-investors are read from the rounds: three or more shared rounds is a strong observed relationship, two a repeat co-investor, one a single round. Funds and people are structural. Nothing is scored that a reader cannot check.

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

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Hydrazine Capital GP, LLC: 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 Hydrazine Capital GP, LLC

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

Investing

2 companies on record, 2 new in 12 months

Investments on record

2 companies, 2 partner-attributed
CompanyRoundRolePartnerRound sizeThis investorDateSource
Antares Nuclear, Inc.board seatunknown · boardJack Altman (strongly supported)unknownunknownAug 18, 2026Inference Form D
Copilot Labs, Inc. \ DEboard seatunknown · boardJack Altman (strongly supported)unknownunknownJan 23, 2026Inference Form D
Redditboard seatunknown · boardSAM Altman (strongly supported)unknownunknownAug 26, 2021Inference Form D

Stated thesis versus observed behaviour

2 observed deals
Stated (the firm’s website)
Sectors
not stated or not yet read
Stages
not stated or not yet read
Geography
not stated
Check size
not stated; DFX does not estimate checks from round sizes
Observed (from deals on record)
Stage at participation: no observed deals yet
Stage at first entry: no observed deals yet
Sectors
Other Energy 50%Other Technology 50%
lead rate no observed dealsfollow-on rate no observed dealsnew companies, 12 months 2

Team

2 current, 0 departed

Decision makers

who to call first, and why; then everyone else by function
  • Sam Altman · Managing Director Of Hydrazine Capital Gp, Llc
    Why this person: Managing director; Named with investment responsibility
  • Jack Altman · Member Of Hydrazine Capital Gp, Llc
    Why this person: Named with investment responsibility

Ranked by the role the firm or its filing states, a route on file and deals led. Every reason is read from the record, never inferred. Routes are published by the person or the firm (their bio, the team page or a filing) and are revealed on a plan; data bought from a provider is never shown, and a route printed at a firm the person has since left is held back.

Investment team

2 current, 0 departed
  • Jack Altman
    Member Of Hydrazine Capital Gp, Llc · 2 deals attributed
  • Sam Altman
    Managing Director Of Hydrazine Capital Gp, Llc · 2 deals attributed

Contacts

1 firm phone

1 firm phone on record, each with its source. Values open with the complete profile.

Funds and LPs

1 vehicle, 0 LPs disclosed

Funds and vehicles

1 reported, 1 no longer reported
VehicleTypeVintageLifecycleReported GAVOwnersForm D soldLatest Form D
Hydrazine Capital, L.P.FundunknownUnknown$28.1M
Nov 25, 2024
5unknownunknown
Hydrazine Capital II, L.P.Fund2015 adv first reportedWound down$322M
Feb 20, 2020
5unknownunknown

Limited partners

0 LPs, 0 disclosed commitments
No LP commitment on record. An LP edge needs a public disclosure with a quote: a pension report (see Limited partners for the plans read), a fund announcement naming the LP, or a Form ADV owner. The fund page carries the LP’s reported performance.

Known LPs and allocators

0 relationships across the firm's funds, from public pensions and the allocator graph
No allocator names this firm or its funds in a public disclosure DFX holds.

Relationships across DFX

0 co-investors

Co-investors

0 counted from shared deals, for the whole firm
No co-investor relationship yet: these are derived only from rounds and portfolio listings the graph has seen both investors on.

Evidence and history

6 dated events, 27 observations from 2 sources

Timeline

6 dated events
  1. Mar 23, 2021
    Hydrazine Capital II Spv, LLC no longer reported on Form ADV by Hydrazine Capital GP, LLC
    Fund no longer reportedFundsInferenceHydrazine Capital II Spv, LLCForm ADV
  2. Mar 23, 2021
    Hydrazine Capital II, L.P. no longer reported on Form ADV by Hydrazine Capital GP, LLC
    Fund no longer reportedFundsInferenceHydrazine Capital II, L.P.Form ADV
  3. Feb 23, 2016
    Hydrazine Capital II Spv, LLC first reported on Form ADV by Hydrazine Capital GP, LLC (Venture Capital Fund), GAV $5,000,000
    Fund first reported on Form ADVFundsFactHydrazine Capital II Spv, LLCForm ADV
  4. Mar 30, 2015
    Hydrazine Capital II, L.P. first reported on Form ADV by Hydrazine Capital GP, LLC (Venture Capital Fund), GAV $40,000,000
    Fund first reported on Form ADVFundsFactHydrazine Capital II, L.P.Form ADV
  5. Oct 26, 2012
    Hydrazine Capital, L.P. first filed Form ADV (ERA, venture capital fund adviser exemption)
    First SEC adviser filingOrganizationFactForm ADV

Identity and regulatory footprint

Address, phone, Form ADV filing and ownersForm ADV filed Nov 25, 2024 · 1 private fundsShow
Headquarters
unknown
Office address
unknown
Business phone
unknownadviserinfo.sec.gov
Website
unknown
SEC adviser type
Exempt reporting adviseradviserinfo.sec.gov
SEC exemption claimed
unknown
Latest Form ADV
Nov 25, 2024
Private funds reported
1 (1 venture capital funds)adviserinfo.sec.gov
Private fund gross assets, adviser total
$28.1Madviserinfo.sec.govreported GAV of the funds, the adviser's own number; not fund size, not dry powder

Classification history

Every classification this record has carried1 on recordShow
  1. Sep 12, 2026
    Micro VC (probable, 80%)
    Venture manager, reported GAV $28.1M across 1 vehicle

Evidence

27 observations from 2 sources
Every observation behind this profile, with its source, date and class
FactValueEffectiveClassSource
SEC adviser typeExempt reporting adviserNov 25, 2024FactForm ADV
First Form ADV filing2012-10-26Nov 25, 2024FactForm ADV
Adv history loadedadv-hist-1Sep 12, 2026FactForm ADV
Latest Form ADV filing2024-11-25Nov 25, 2024FactForm ADV
Venture share of reported funds1Nov 25, 2024FactForm ADV
Business phoneNov 25, 2024FactForm ADV
Legal formLimited Liability CompanyNov 25, 2024FactForm ADV
Private funds reported1Nov 25, 2024FactForm ADV
Private fund gross assets (reported)$28.1MNov 25, 2024FactForm ADV
Schedule a diffsadiff-1Oct 1, 2026FactForm ADV
Venture funds reported1Nov 25, 2024FactForm ADV
How this is scored
Scores, classification basis and filing advisersMicro VC, probableShow
Importance
11
low
Active deployment
8
low
Emerging
0
low
Freshness
100
high
Micro VC · probableSEC exempt reporting adviser

Venture manager, reported GAV $28.1M across 1 vehicle

The inputs behind each score
importance
gav: 0.14 · funds: 0.17 · people: 0.08 · investments: 0.11 · co investors: 0
active deployment
investments 12m: 0.25 · fund raising 18m: 0 · people joined 12m: 0 · vintage within 3y: 0 · latest investment at: 2026-08-18
emerging manager
fund count: 2 · reported gav: $28.1M · first adv filing: 2012-10-26 · years since first filing: 13.9

Fits, record history and connections

scored matches for this investor, every identity change, every edge

Record history

1 dated event on the change ledger, latest event first
  • Adviser's first ADV filing
    2012-10-26source 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.