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Rainey Janke
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Rainey Janke

Vice President of Investor Relations

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At a glance

Full Name
Rainey Janke
Title
Senior Advisor - Investor Relations
Firm
Post Oak Energy Capital
Firm Type
Energy-focused private equity firm
Investment Stage
Lower-middle-market private equity; growth, development, acquisitions, and recapitalizations
Check Size
Not published as a standard check size; disclosed Post Oak commitments include $50 million to $300 million equity commitments, and Fund V closed with $600 million of capital commitments
Target Company Profile
Experienced oil and gas entrepreneurs and management teams with well-defined business plans and demonstrated records of shareholder value creation
Sector Focus
Upstream oil and gas, minerals and royalties, midstream, oilfield services
Geographic Focus
Domestic U.S. / North America, with recent activity in the Permian, Utica, Haynesville, Eagle Ford, SCOOP, and Southern Delaware Basin
Location
Houston, Texas

Background

Rainey Janke is Senior Advisor of Investor Relations at Post Oak Energy Capital, where she manages the firm’s investor base and raises private equity capital. Post Oak’s team page also states that she sits on the board of Nadel & Gussman N.V., LLC.

Before joining Post Oak, Janke was Vice President of Investor Relations at EnerVest, Ltd. In that role she managed investor needs, developed prospective investor relationships, helped raise five private equity funds totaling $7.5 billion, and helped raise several co-investment partnerships totaling $734 million. She also helped negotiate oil and gas credit facilities for institutional funds and hedged fund production through derivative products.

Earlier in her career, Janke served as Treasurer for Belden & Blake Corporation and was a member of EnerVest’s Defined Benefit and 401K Retirement Committee. She began her career at Frost National Bank in San Antonio, Texas.

Janke received a B.B.A. in Finance from the University of Texas at Austin. Post Oak notes that she was a Normandy Scholar in 1999 and was appointed to George W. Bush’s Juvenile Criminal Justice Committee in 1998-1999.

Investment Thesis & Focus

  • Post Oak is not presented in primary sources as an angel investor; it is a Houston-based private equity firm focused on the North American energy sector.
  • The firm states its goal is to “identify the best management teams with compelling business plans” and provide growth capital and strategic support.
  • Post Oak targets middle-market energy investments, a segment it says is underserved and likely to produce superior risk-adjusted returns.
  • The firm primarily targets private investments in upstream oil and gas and minerals and royalty assets, while also describing its broader focus as upstream, midstream, and oilfield services.
  • Fund V is focused on the lower-middle-market segment of North American upstream oil and gas and backs growth, development, acquisition, and recapitalization opportunities.
  • For minerals and royalties, Post Oak focuses on core producing basins in North America where it has current and legacy ownership positions, actively managing those positions for accelerated development and current cash yield.

Notable Investments

  • Tiburon Oil & Gas Partners - October 2024 equity commitment from Post Oak; pursuing leasehold acquisition and development in the liquids-rich Utica Shale in Ohio.
  • Ichthys Energy Partners - October 2024 equity commitment; Dallas-based E&P company focused on operated and non-operated leasehold acquisitions and strategic partnerships across the Permian Basin.
  • Quantent Energy Partners - September 2024 equity commitment from Post Oak Energy Partners V; Oklahoma City-based company targeting Haynesville and Bossier upstream natural gas assets in North Louisiana and East Texas.
  • Post Oak Minerals V - Formed in 2024 with a Post Oak Energy Partners V equity commitment; acquired more than $475 million of primarily Permian Basin minerals and royalties in 2024.
  • Midway Energy Partners - Post Oak-backed upstream platform focused on acquiring and developing operated positions in the Permian Basin; completed sale of Permian Basin assets to multiple operators in June 2026.
  • Switchgrass E&P Holdco - Post Oak-backed oil and gas operator focused primarily on Oklahoma’s SCOOP play; sold in June 2026.
  • UpCurve Energy Partners I and II - Post Oak announced the May 2026 sale of assets in the Southern Delaware Basin in West Texas.
  • Nadel and Gussman NV / Quantent Haynesville assets - Post Oak announced the May 2026 simultaneous sale of producing Haynesville natural gas assets; Janke is listed as a board member of Nadel & Gussman N.V., LLC.

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