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SteelPath was a Dallas-based investment advisory firm specializing exclusively in publicly traded master limited partnerships and midstream energy infrastructure.

Last updated August 31, 2026

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Overview

SteelPath was an American investment advisory firm headquartered in Dallas, Texas, whose business was devoted to the master limited partnership (MLP) asset class. It became notable for translating a specialized form of energy-infrastructure investing into investment products that could be accessed by a broader range of public-market investors. The business originated in 2004, when Gabriel Hammond founded Alerian. Alerian developed the Alerian MLP Index, identified as AMZ on the New York Stock Exchange, which was described as the first index of its kind and became a widely recognized benchmark for publicly traded MLPs. MLPs are commonly used by energy-infrastructure businesses and can generate distributable cash flows from assets such as pipelines and related midstream facilities. Their structure and tax treatment made them attractive to some income-oriented investors, while their partnership reporting requirements could make direct ownership cumbersome for individuals. In March 2010, Alerian's active-management operation was rebranded as SteelPath and separated from the index-focused Alerian business. SteelPath concentrated on managing portfolios invested in MLPs rather than on maintaining an index alone. The firm received particular attention in 2010 when it became the first investment adviser to offer open-ended mutual funds focused on MLPs. These vehicles were designed to provide access to the asset class through a regulated fund structure, with portfolio management handled centrally and tax reporting generally consolidated into a Form 1099 rather than the multiple state partnership filings that can accompany direct MLP ownership. SteelPath's investment approach focused exclusively on energy infrastructure and the emerging midstream MLP sector. The firm presented MLPs as an energy-infrastructure analogue to real estate investment trusts, emphasizing their public-market liquidity, distribution-oriented economics, and pass-through tax structure. Its offerings included open-ended mutual funds, private investment partnerships, and separately managed accounts. Gabriel Hammond and Stuart Cartner, both of whom had prior MLP-related experience at Goldman Sachs, managed the SteelPath funds. The firm remained an investment adviser registered with the U.S. Securities and Exchange Commission. In July 2012, OppenheimerFunds announced the acquisition of SteelPath Capital Management and SteelPath Fund Advisors for their MLP business. OppenheimerFunds subsequently became part of Invesco, and SteelPath is no longer presented as an independent operating investment-advisory brand in the available reference material. The acquisition marked the end of SteelPath's period as a standalone firm while preserving the strategic value of its specialized MLP investment platform within a larger asset-management organization.

History

SteelPath emerged from a business founded by Gabriel Hammond in 2004 under the name Alerian. The original enterprise combined specialized knowledge of the master limited partnership market with the development of investment-industry infrastructure. Its best-known early achievement was the creation of the Alerian MLP Index, identified by the NYSE symbol AMZ. The index was described as the first benchmark of its type and later became broadly recognized as a reference point for the MLP asset class. Alerian's work addressed a relatively specialized segment of the public markets. MLPs were commonly associated with energy infrastructure, particularly the midstream portion of the industry, and were structured to distribute a substantial portion of available cash flow to investors. They could therefore appeal to investors seeking income and exposure to infrastructure-related businesses. At the same time, direct ownership could involve partnership tax documents, including state-level filings, which created an administrative barrier for some investors. In March 2010, the active-management operation was rebranded SteelPath and separated from Alerian. The distinction allowed Alerian to remain associated with its index and benchmark activities while SteelPath focused on portfolio management and investment products. The new firm concentrated exclusively on MLPs and energy infrastructure. It registered with the U.S. Securities and Exchange Commission as an investment adviser and developed a family of open-ended mutual funds devoted to the asset class. The mutual-fund initiative was central to SteelPath's identity. The firm was described as the first investment adviser to offer open-ended MLP mutual funds. Instead of requiring each investor to buy individual partnership interests and manage the associated partnership reporting, the fund structure offered pooled exposure, centralized management, and a single Form 1099 for tax reporting as described in the reference material. SteelPath also managed private investment partnerships and separately managed accounts, giving institutional and qualified investors additional ways to obtain MLP exposure. The firm's investment specialists included Gabriel Hammond, who had previously handled MLPs at Goldman Sachs, and Stuart Cartner, who also had prior Goldman Sachs experience. They managed the SteelPath funds and helped establish the firm as a specialist rather than a diversified asset manager. Its positioning rested on the comparison between MLPs and real estate investment trusts: both were presented as publicly traded, distribution-oriented vehicles with distinctive tax characteristics, although the underlying assets and legal structures differed. In July 2012, OppenheimerFunds announced that it would acquire SteelPath Capital Management and SteelPath Fund Advisors. The transaction was directed at SteelPath's MLP business and brought the specialist platform into a larger investment-management company. OppenheimerFunds later became part of Invesco. On the available evidence, SteelPath should therefore be treated as a former standalone investment-advisory brand rather than an active independent firm. The available historical record emphasizes its role in expanding access to MLP investing and in helping establish dedicated MLP mutual funds as an investable product category.

  • 2012

    OppenheimerFunds announces acquisition

    [1]

    OppenheimerFunds announced the acquisition of SteelPath Capital Management and SteelPath Fund Advisors for their MLP investment business.

  • 2010

    Active-management business becomes SteelPath

    [1]

    Alerian's active-management operation was rebranded SteelPath and separated from the index business.

  • 2010

    First open-ended MLP mutual funds are offered

    [1]

    SteelPath launched a family of open-ended mutual funds focused on master limited partnerships, becoming the first investment adviser identified in the source to offer this product type.

  • 2004

    Alerian is founded

    [1]

    Gabriel Hammond founded Alerian, the business from which SteelPath later emerged.

  • 2004

    Alerian MLP Index is created

    [1]

    Alerian created the Alerian MLP Index, identified as AMZ and described as the first index dedicated to the MLP asset class.

Products and positioning

A specialist asset manager providing public-market access to energy infrastructure and master limited partnerships, with an emphasis on income-oriented investing, focused portfolios, and simplified access relative to direct MLP ownership.

  • Mutual funds · 2010

    SteelPath open-ended MLP mutual funds

    A family of open-ended mutual funds designed to provide diversified exposure to publicly traded master limited partnerships, particularly businesses associated with midstream energy infrastructure. The structure offered pooled portfolio management and was intended to make MLP investing more accessible than direct ownership, including simpler tax reporting through a Form 1099 rather than the partnership K-1 process described in the source.

  • Private investment vehicles

    Private investment partnerships

    Privately offered investment partnerships managed for investors seeking focused exposure to the master limited partnership and energy-infrastructure sector. The available material identifies these vehicles as part of SteelPath's broader product range but does not provide individual fund names, launch dates, or performance figures.

  • Managed accounts

    Separately managed accounts

    Customized portfolios managed directly for eligible clients and invested according to SteelPath's MLP-focused strategy. These accounts complemented the firm's pooled mutual funds and private partnerships, although the available reference material does not specify account mandates, minimums, or client categories.

Brand decisions

  • 2012

    Sell the SteelPath platform to OppenheimerFundsM&A

    Background

    SteelPath had built a specialist MLP investment platform spanning mutual funds, private partnerships, and separately managed accounts.

    Action taken

    OppenheimerFunds announced the acquisition of SteelPath Capital Management and SteelPath Fund Advisors.

    Aftermath

    The transaction ended SteelPath's period as an independent investment adviser and transferred its MLP business into OppenheimerFunds, which later became part of Invesco.

  • 2010

    Separate and rebrand the active-management operationStrategy

    Background

    Alerian had developed both an MLP index business and an active investment-management operation. The active-management side was separated so it could operate under a distinct specialist identity.

    Action taken

    The active-management business was rebranded SteelPath and focused exclusively on MLP investing and energy infrastructure.

    Aftermath

    The separation established SteelPath as a dedicated MLP asset manager while Alerian remained associated with the index and benchmark side of the business.

  • 2010

    Launch open-ended mutual funds focused on MLPsProduct launch

    Background

    Direct investment in MLPs could be administratively difficult for some investors because of partnership tax reporting and multiple state filings.

    Action taken

    SteelPath created a family of open-ended mutual funds offering pooled, unleveraged access to the MLP asset class and centralized investment management.

    Aftermath

    The launch attracted press attention and positioned SteelPath as an early specialist in making MLP exposure available through a conventional mutual-fund format.

Sources1 sources

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