# Old Ironsides Energy

Old Ironsides Energy is a Private Equity based in Waltham, United States.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Waltham, United States
- **Region:** North America
- **Address:** 500 Totten Pond Road, Suite 630, Waltham, Massachusetts 02451, United States
- **Founded:** 2013
- **Assets under management:** Undisclosed
- **Website:** www.oldironsidesenergy.com
- **LinkedIn:** https://www.linkedin.com/company/old-ironsides-energy-llc

## Regulatory record

- **CRD number:** 168670
- **SEC file number:** 801-78440
- **Registration status:** Registered
- **Reports private funds:** Yes
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/168670

## About

Old Ironsides Energy is a long-term private energy investor with roots in oil and gas asset development and private equity. It has generated over a billion dollar investing platform that seeks to join oil and gas assets with established upstream and midstream management teams. The firm has helped build or establish more than 20 energy companies and asset-level joint ventures, with the goal of delivering results for its investors.

## Sectors

- Energy
- Infrastructure

## People

- Sean O'Neill — Principal
- Daniel Rioux — Principal

## Questions

### Who runs investment decisions at Old Ironsides Energy?

Principals Sean O'Neill and Daniel Rioux lead investment decisions. The firm lists four additional investment professionals — Edward Joullian, Eric Jones, Erick Dominguez Ortiz, and Eihab Khan — who support sourcing, diligence, and portfolio management. O'Neill and Rioux have worked together since before the firm's 2013 founding.

### How does Old Ironsides Energy source proprietary deal flow?

Old Ironsides sources deal flow by partnering directly with established upstream and midstream management teams to form asset-level joint ventures and new operating companies. The firm does not appear to run a competitive auction-based sourcing model, relying instead on its principals' relationships and basin-specific expertise to originate opportunities.

### Does Old Ironsides Energy participate in fund commitments or only direct deals?

Old Ironsides invests directly by forming joint ventures and operating companies alongside management teams. It does not market itself as a fund-of-funds investor and does not advertise a strategy of committing to third-party energy funds.

### What investment stages and structures does Old Ironsides Energy typically target?

The firm targets both upstream and midstream assets, forming new operating companies or asset-level joint ventures. It focuses on established management teams with basin-specific development plans rather than early-stage exploration concepts. Disclosed structures include direct co-investment-style partnerships rather than majority-control buyouts.

### Which basins and geographies does Old Ironsides Energy invest in?

Old Ironsides invests exclusively in North America. Its upstream portfolio companies have drilled and developed acreage across the Permian Basin, Powder River Basin, DJ Basin, Piceance Basin, Eagle Ford shale, East Texas, northwest Louisiana, and the Mid-Continent, as disclosed on its website.

### Does Old Ironsides Energy invest in energy transition or renewables?

Old Ironsides does not publicly disclose investments in renewable energy or energy transition themes. Its stated strategy centers on upstream oil and gas development and midstream infrastructure such as crude oil gathering, natural gas processing, and produced water disposal, with no mention of solar, wind, carbon capture, or similar sectors.

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- [Old Greenwich Capital Partners](https://altss.com/profile/old-greenwich-capital-partners)
- [Old Line Capital Partners](https://altss.com/profile/old-line-capital-partners)

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Last updated: 2026-08-11T15:07:41.444Z

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