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  1. Professionals

David Lange

Partner

Dallas

+1 214-453-6436

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  • Overview
  • Experience
  • Credentials
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Named a Super Lawyers “Rising Star” and D Magazine “Best Lawyer in Dallas,” David represents private and public companies and private equity funds on complex business transactions.

His experience including mergers and acquisitions, private equity and venture capital investments, leveraged buyouts, recapitalizations, senior and subordinated debt financings, securities offerings, and corporate governance matters.

David’s client experience spans a broad range of corporate and securities matters and transactions as well as a variety of industries, including energy, hospitality, business services, manufacturing, technology, and health care.

Key Matters

Some of the experience represented below may have been handled at a previous firm.

Representative Experience
  • Representation of CSL Capital Management, in a number of transactions, including:
    • the acquisition of the well services, well workover, fluid management, well completions and snubbing operations and related equipment rental operations of Bayou Workover Services, LLC and Bayou Well Services, LLC;
    • the acquisition, out of a receivership, of multiple water management businesses;
    • the disposition of Independence Oilfield Chemicals, LLC to Innospec, Inc.;
    • the sale of the water treatment and recycling division of Fountain Quail Energy Services, LLC to XRI Holdings, LLC;
    • representation of Sentinel Energy Services, a portfolio company of CSL Capital Management, LP and a special purpose acquisition, in connection with multiple proposed acquisitions;
    • representation of High Roller Sand, a joint venture of CSL Capital Management, LP and other oil and gas investors, in the sale of its state-of-the-art hydraulic fracturing sand mine, located in Winkler County, Texas to Schlumberger;
    • representation of CSL Capital Management in connection with its recapitalization of BJ Energy Solutions;
    • representation of CSL Ventures, the venture capital arm of CSL Capital Management, LP, in its Series A investment in REDLIST; and
    • the structuring, formation, and day-to-day representation of various portfolio companies.
  • Representation of Transition Capital Partners in its acquisition and disposition of various portfolio companies and financing transactions, including:
    • the acquisition of Hayes Software Systems, an Austin, Texas-based provider of education software and its subsequent disposition to Frontline Education, a Thoma Bravo portfolio company;
    • the acquisition of SuccessEd, a leading provider of education regulatory compliance software;
    • representation of PostUp Digital, an Austin-based digital marketing software provider and portfolio company of Dallas private equity sponsor Transition Capital Partners, in connection with its sale to Upland Software;
    • representation of Highstreet IT Solutions, a Maryland-based information technology services provider and portfolio company of Dallas private equity sponsor Transition Capital Partners, in the sale of its Highstreet Network Solutions division to Axispoint Technology Solutions Group; and
    • representation of Hospice Source, a Dallas-based durable medical equipment provider and portfolio company of Transition Capital Partners, in its acquisition of more than ten acquisitions of DME assets.
  • Representation of NextGen Growth Partners in connection with numerous acquisition and financing transactions, including its acquisitions of Record Connect and Sunrise Landscape.
  • Representation of Miramar Equity Partners in connection with numerous acquisition and equity and debt financing transactions.
  • Representation of PEAG, LLC in connection with the sale of JLab Audio to Noritsu Koki Co. Ltd. for US$370M.
  • Representation of Argenta Partners in connection with multiple investment transactions, including its acquisition of Sonic Connectors, a leading manufacturer and installer of wellhead solutions for the oil and gas industry.
  • Representation of FABco, a leading provider of concrete construction materials and supplies including engineered steel rebar and associated construction products, in connection with its sale to Argonaut Private Equity.
  • Representation of TRC Companies, a leading provider of end-to-end engineering, consulting and construction management services in connection with multiple acquisition and disposition transactions.
  • Representation of numerous public and private companies and family offices in connection with mergers and acquisitions and investment transactions.
Recent Experience
Winston Represented Lincoln Property Company in its Strategic Investment in Centennial
Winston Represented Woolpert in its Acquisition of Murphy Geospatial
Winston Represented Highstreet IT Solutions in its Sale to CIVC Partners
ProFrac Holdings Corp. Affiliate's Acquisition of Performance Proppants
ProFrac Holdings II, LLC, Acquires Monarch Silica, LLC
Ranger Energy Services, Inc.'s Acquisition of PerfX Wireline Services
PEAG, LLC dba JLab Sale Transaction
Hospice Source's Acquisition of Superior Healthcare Inc.
Transition Capital Partners's Sale of SuccessEd to Frontline Education
Acquisition of Certain Fracturing and Intellectual Property Assets of BJ Services

  • The Best Lawyers in America®, Mergers and Acquisitions Law, 2025
  • The Legal 500 US, “key lawyer,” M&A/Corporate and Commercial – Private Equity Buyouts (2023–2024)
  • The Legal 500 US, M&A/Corporate and Commercial – Venture Capital and Emerging Companies (2016)
  • D Magazine, “Best Lawyer in Dallas” (2018, 2020–2022, 2024–2025)
  • Super Lawyers, “Rising Star” (2016)

  • Member, State Bar of Texas

Capabilities

Transactions
Private Equity
Mergers & Acquisitions
Capital Markets
Corporate Governance
Technology, Media & Telecommunications
Health Care
Financial Services
Energy
Oil & Gas

Key Matters

Some of the experience represented below may have been handled at a previous firm.

Representative Experience
  • Representation of CSL Capital Management, in a number of transactions, including:
    • the acquisition of the well services, well workover, fluid management, well completions and snubbing operations and related equipment rental operations of Bayou Workover Services, LLC and Bayou Well Services, LLC;
    • the acquisition, out of a receivership, of multiple water management businesses;
    • the disposition of Independence Oilfield Chemicals, LLC to Innospec, Inc.;
    • the sale of the water treatment and recycling division of Fountain Quail Energy Services, LLC to XRI Holdings, LLC;
    • representation of Sentinel Energy Services, a portfolio company of CSL Capital Management, LP and a special purpose acquisition, in connection with multiple proposed acquisitions;
    • representation of High Roller Sand, a joint venture of CSL Capital Management, LP and other oil and gas investors, in the sale of its state-of-the-art hydraulic fracturing sand mine, located in Winkler County, Texas to Schlumberger;
    • representation of CSL Capital Management in connection with its recapitalization of BJ Energy Solutions;
    • representation of CSL Ventures, the venture capital arm of CSL Capital Management, LP, in its Series A investment in REDLIST; and
    • the structuring, formation, and day-to-day representation of various portfolio companies.
  • Representation of Transition Capital Partners in its acquisition and disposition of various portfolio companies and financing transactions, including:
    • the acquisition of Hayes Software Systems, an Austin, Texas-based provider of education software and its subsequent disposition to Frontline Education, a Thoma Bravo portfolio company;
    • the acquisition of SuccessEd, a leading provider of education regulatory compliance software;
    • representation of PostUp Digital, an Austin-based digital marketing software provider and portfolio company of Dallas private equity sponsor Transition Capital Partners, in connection with its sale to Upland Software;
    • representation of Highstreet IT Solutions, a Maryland-based information technology services provider and portfolio company of Dallas private equity sponsor Transition Capital Partners, in the sale of its Highstreet Network Solutions division to Axispoint Technology Solutions Group; and
    • representation of Hospice Source, a Dallas-based durable medical equipment provider and portfolio company of Transition Capital Partners, in its acquisition of more than ten acquisitions of DME assets.
  • Representation of NextGen Growth Partners in connection with numerous acquisition and financing transactions, including its acquisitions of Record Connect and Sunrise Landscape.
  • Representation of Miramar Equity Partners in connection with numerous acquisition and equity and debt financing transactions.
  • Representation of PEAG, LLC in connection with the sale of JLab Audio to Noritsu Koki Co. Ltd. for US$370M.
  • Representation of Argenta Partners in connection with multiple investment transactions, including its acquisition of Sonic Connectors, a leading manufacturer and installer of wellhead solutions for the oil and gas industry.
  • Representation of FABco, a leading provider of concrete construction materials and supplies including engineered steel rebar and associated construction products, in connection with its sale to Argonaut Private Equity.
  • Representation of TRC Companies, a leading provider of end-to-end engineering, consulting and construction management services in connection with multiple acquisition and disposition transactions.
  • Representation of numerous public and private companies and family offices in connection with mergers and acquisitions and investment transactions.
Recent Experience
Winston Represented Lincoln Property Company in its Strategic Investment in Centennial
Winston Represented Woolpert in its Acquisition of Murphy Geospatial
Winston Represented Highstreet IT Solutions in its Sale to CIVC Partners
ProFrac Holdings Corp. Affiliate's Acquisition of Performance Proppants
ProFrac Holdings II, LLC, Acquires Monarch Silica, LLC
Ranger Energy Services, Inc.'s Acquisition of PerfX Wireline Services
PEAG, LLC dba JLab Sale Transaction
Hospice Source's Acquisition of Superior Healthcare Inc.
Transition Capital Partners's Sale of SuccessEd to Frontline Education
Acquisition of Certain Fracturing and Intellectual Property Assets of BJ Services

Credentials

Education

David received his B.A., with honors, in 2004 from Texas A&M University, and he received his J.D., with honors, in 2007 from The University of Texas School of Law, where he was Staff Editor of the Texas Journal of Oil, Gas, and Energy Law.

    Admissions
    • Texas

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    Capabilities

    Transactions
    Private Equity
    Mergers & Acquisitions
    Capital Markets
    Corporate Governance
    Technology, Media & Telecommunications
    Health Care
    Financial Services
    Energy
    Oil & Gas
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