Key facts
- FIRST RESERVE is a private equity firm based in STAMFORD, CT with 2 tracked portfolio companies.
- Notable positions include LineStar Integrity Services, WGI (Construction and Engineering).
- FIRST RESERVE has 12 funds on record, raising $9.0B across the 10 that report a size.
- FIRST RESERVE reports $3.6B in regulatory assets under management across 25 private funds, per its SEC Form ADV (2026-03).
Registered with the SEC
Form ADV · 2026-03 · CRD 157056- Regulatory AUM
- $3.6B
- Private fund assets
- $7.0B
- Private funds
- 25 · 25 private equity
- Staff
- 38
- Registered office
- STAMFORD, CT
- SEC status
- Approved
Discloses a disciplinary history on Form ADV. Reports custody of client assets.
Source: SEC Investment Adviser Public Disclosure, Form ADV (registered as FIRST RESERVE MANAGEMENT, L.P.).
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Portfolio, priced
2 companies · by our current valuations| Company | Industry | Valuation | First invested | Role |
|---|---|---|---|---|
| LineStar Integrity Services | — | — | — | |
| WGI (Construction and Engineering) | — | — | — |
Funds
6 of 12 recorded- First Reserve Ascent Opportunities Feeder Fund, L.P.2025$314.7M
- First Reserve Ascent Opportunities Fund, L.P.2025$488.2M
- First Reserve IOG Resources III, L.P.2025$200.0M
- First Reserve IOG Resources II, L.P.2022$150.0M
- First Reserve Legacy Opportunities Fund, L.P.2022—
- First Reserve Refuel Fund, L.P.2021$510.5M
$9.0B raised across the 10 funds that report a size
All 12 funds →Frequently asked
- What companies does FIRST RESERVE invest in?
- FIRST RESERVE has 2 recorded portfolio companies, including LineStar Integrity Services, WGI (Construction and Engineering).
- What is FIRST RESERVE's AUM?
- FIRST RESERVE manages approximately $3.6B in assets.