Ryan J. Maierson

  • Partner
  • Eryan.maierson@lw.com
  • 811 Main Street
  • Suite 3700
  • Houston, TX 77002
  • USA
  • T +1.713.546.7420


Ryan Maierson is a partner in the Houston office, the Chair of the Houston Corporate Department, and the Global Chair of Latham’s Public Company Representation Practice. Mr. Maierson has particular knowledge in M&A and corporate finance transactions in the energy industry.

  • Mergers and acquisitions
  • Representing issuers and underwriters in IPOs and other securities offerings
  • Representing both sponsors and portfolio companies in private equity transactions
  • Corporate governance

Mr. Maierson is an adjunct professor at the University of Houston Law Center, where he co-teaches “Doing Deals,” a course on M&A practice, with Professor Douglas Moll.


Representative Capital Markets transactions include advising on:
  • ProPetro Holding Corp. US$402 million initial public offering
  • Smart Sand, Inc. US$128.7 million initial public offering
  • Solaris Oilfield Infrastructure, Inc. US$121 million initial public offering
  • Antero Midstream GP LP US$875 million initial public offering
  • Emerge Energy Services LP US$131 million initial public offering and private placement of preferred units
  • PennTex Midstream Partners, LP US$225 million initial public offering
  • Antero Resources US$1.57 billion initial public offering of and the US$1 billion and US$600 million notes offerings
  • Enable Midstream Partners US$500 million initial public offering, the largest entity at IPO in the history of the MLP sector
  • Cypress Energy Partners, L.P. US$86.25 million initial public offering
  • JP Energy Partners LP US$275 million initial public offering
  • Southcross Energy Partners US$180 million initial public offering
  • Solaris Oilfield Infrastructure, Inc. US$121 million initial public offering
Representative M&A transactions include advising on:
  • Midstates Petroleum Company in its US$729 million merger of equals with Amplify Energy, an independent oil and natural gas company
  • UGI Corporation in its US$1.275 billion acquisition of Columbia Midstream Group, LLC from a subsidiary of TC Energy Corporation
  • Archrock, Inc. in its US$410 million acquisition of Elite Compression Services LLC’s midstream oil and gas infrastructure assets
  • EQM Midstream Partners in its US$1.03 billion acquisition of controlling interest in Eureka Midstream and Hornet Midstream and related US$1.00 billion preferred equity financing
  • IPSCO Tubulars, a producer of seamless and welded oil country tubular goods, in its US$1.02 billion sale to Tenaris (pending)
  • UGI in its US$5.375 billion acquisition of the remaining 74% stake in Amerigas, a retail propane distributor
  • WL Ross as major shareholder in the spin-merger of Diamond S Shipping, a Greece-based oil tanker company, and a subsidiary of Capital Product Partners
  • A global oil and gas company in its acquisition of Gulf of Mexico oil and gas properties in the bankruptcy proceedings of Cobalt International Energy
  • Rice Midstream Partners in its US$2.4 billion merger with EQT Midstream Partners
  • Buckeye Partners in its US$1.15 billion acquisition of 50% stake in VTTI
  • Energy Transfer Partners in its US$20 billion merger with Sunoco Logistics Partners
  • Energy Transfer Partners LP in its US$18 billion acquisition of Regency Energy Partners LP
  • Access Midstream Partners, LP in its US$50 billion merger with Williams Partners
  • VTTI in its US$1.03 billion acquisition of VTTI Energy Partners
  • Archrock, Inc. in its US$607 million acquisition of its master limited partnership, Archrock Partners LP
  • Layne Christensen Co. in its US$565 million sale to Granite Construction, Inc.
  • JP Energy Partners in its US$456 million merger with American Midstream Partners, to create a diversified midstream business operating in North American basins, including the Permian, Gulf of Mexico, Eagle Ford, and Bakken
  • Access Midstream Partners in its US$2.16 billion acquisition of gathering and processing assets from Chesapeake Energy and US$1.8 billion of related equity and debt capital markets offerings
  • Global Infrastructure Partners in its US$2.0 billion acquisition from Chesapeake Energy of general partner and limited partner interests in Chesapeake Midstream Partners
  • Archrock Holdings in the spin-off of its international services and global fabrication businesses to form Exterran Holdings
  • Exterran Partners, L.P. in its US$360 million acquisition of natural gas compression assets from MidCon Compression, L.L.C.   

Thought Leadership

  • Spin-offs Unraveled: Complex ‘IPOs’ With a Sophisticated Tax Overlay -  October 09, 2019
  • Boardroom Perspectives: 5 Key Takeaways on Cybersecurity -  June 01, 2018
  • Boardroom Perspectives: 5 Steps Toward a Workplace Without Sexual Misconduct -  December 19, 2017
  • Boardroom Perspectives: 3 Steps FPI Directors Can Take to Oversee Related-Party Transactions -  October 06, 2017
  • Proxy Access – Preparing for the 2016 Proxy Season -  October 30, 2015
  • Midstream MLP Merger Mania Maintains Momentum -  October 30, 2014
  • Four Trends in Master Limited Partnership M&A in 2014 -  October 01, 2014
  • 6 Oilfield Services Trends In Unconventional Resources  -  May 22, 2014
  • Master Limited Partnership Year in Review: 10 MLP Observations from 2013 -  January 15, 2014
  • Tracking Emerging Growth Cos. Under the JOBS Act -  May 16, 2013
  • Regulatory: Navigating the “Dual Track” IPO/M&A process -  April 10, 2013
  • Upstream M&A Trends in the Oil and Gas Industry -  March 13, 2013
Praised by clients for being “a great lawyer” whom they “love to work with.”Chambers USA 2019
Bar Qualification
  • Texas
  • JD, University of Texas School of Law, 1996
    With Honors, Order of the Coif
  • BS, Wharton School, University of Pennsylvania, 1992
    magna cum laude
  • Oil & Gas
  • Capital Markets
  • Master Limited Partnerships
  • Activism
  • Public Company Representation
  • Mergers & Acquisitions
  • Private Equity
  • Corporate Governance