Blackstone Alums Launch $400M Fund with Backing from Sports Mogul Blitzer

NEW YORK, NY – April 08, 2026 – In a powerful signal of investor confidence, 154 Partners, a new private equity firm founded by former Blackstone colleagues, announced the final closing of its debut fund at its $400 million hard cap. The firm, launched in January 2025 by Isaac Harrouche and Mike Berlin, brings together a team with deep roots in one of the world's largest investment firms and adds a significant heavyweight to its corner: sports and finance titan David Blitzer.

Blitzer, a force in both private equity and professional sports, joins Harrouche and Berlin on the firm’s Investment Committee, reuniting a team that first worked together in Blackstone’s Tactical Opportunities group. The successful fundraise, completed in approximately 15 months, equips 154 Partners with substantial capital to execute its strategy of investing in founder- and family-led businesses in the lower-middle market, with a distinct focus on residential, business, and sports & live event services.

The Blackstone Pedigree and Blitzer’s Influence

The foundation of 154 Partners is built on the shared history and expertise of its leadership. Co-Founders Isaac Harrouche, who serves as CEO, and Mike Berlin, the firm's CIO, both began their careers under Blitzer's leadership at Blackstone's highly successful Tactical Opportunities (Tac Opps) division. This background provides them with extensive experience in structuring complex transactions and identifying unique investment opportunities across various industries.

David Blitzer’s involvement elevates the new firm beyond a typical spin-out. As the Chairman of Blackstone’s Tac Opps and Co-Founder of Harris Blitzer Sports & Entertainment (HBSE), which owns the Philadelphia 76ers and New Jersey Devils, Blitzer brings an unparalleled network and deep sectoral expertise. His personal investment portfolio is vast, with stakes in the Washington Commanders (NFL), Cleveland Guardians (MLB), Real Salt Lake (MLS), and several European soccer clubs, including Crystal Palace F.C. and Germany's FC Augsburg. He is noted as the first person to hold equity in teams across all five major U.S. professional sports leagues.

Blitzer’s enthusiasm for the new venture is clear. “I am thrilled to partner with Isaac and Mike again. I had the privilege of hiring them both at Tac Opps, and Isaac was instrumental in helping me launch and scale Bolt Ventures since 2018,” Blitzer stated. He specifically pointed to the firm’s potential in a key niche: “We believe that some of the most compelling opportunities exist at the smaller end of the market, especially in the sports and live events sector, where our relationships give us a differentiated ability to find these businesses and bring in the right resources to help drive meaningful growth.”

Targeting the Untapped Lower-Middle Market

154 Partners is deliberately steering clear of the mega-deals that dominate headlines, instead focusing on what it sees as an underserved and opportunity-rich segment: the lower-middle market. The firm targets profitable private companies generating between $2 million and $20 million in EBITDA, a space often occupied by founder- and family-run businesses that are too large for small business loans but too small for large-cap private equity funds.

This strategy is underpinned by a “partnership-driven approach” that the founders believe is crucial for success in this segment. Rather than pursuing hostile takeovers or purely financial engineering, the firm emphasizes collaboration with existing leadership to preserve the company's legacy while fueling growth. “Our goal is to balance value creation with capital preservation, helping businesses grow sustainably while honoring what founders have already built,” said Berlin. This philosophy is designed to resonate with owner-operators who are seeking not just capital, but a strategic partner to help them scale.

The firm’s approach includes providing operational resources, strengthening management teams, and executing strategic acquisitions to build stronger, more resilient platforms. “Our investors share our conviction in the lower-middle market and believe in our partnership-driven approach to structuring transactions that meets the needs of founders and owner-operators,” Harrouche commented.

A Niche Focus on Services and Sports

The firm’s investment thesis is concentrated on three core sectors known for their fragmentation and growth potential. The residential services market, valued at over $650 billion and dominated by small, regional operators, presents a significant opportunity for consolidation and modernization. Likewise, the business services sector offers stable, recurring revenue streams and is ripe for technology-driven efficiency gains and strategic M&A.

However, it is the focus on sports and live events that most clearly leverages the unique expertise of its leadership team. With Blitzer’s deep connections and the firm’s stated interest in the sector, 154 Partners is positioned to capitalize on the growing professionalization and investment surge in sports-adjacent businesses. These can include everything from guest services and logistics to technology platforms and fan engagement companies.

This strategy is already in motion. Since its launch last year, 154 Partners has made two platform investments: one in an accounting services consolidation platform, fitting its business services thesis, and another in a guest services platform focused on the sports and live events industry. These initial deals demonstrate a clear execution of their stated playbook, deploying capital into the exact niches they identified as having high potential.

A Strong Debut in a Competitive Market

Closing a debut fund at a $400 million hard cap is a notable achievement in any climate, but doing so in a competitive fundraising environment underscores the strength of the team’s pitch and pedigree. The process, completed in just over a year, is faster than the industry average for first-time funds, which often take 18 months or more. This success points to strong backing from a strategic group of investors, including Blitzer’s family office, Bolt Ventures, and other like-minded family offices seeking a more hands-on investment approach.

154 Partners plans to deploy $40 million to $100 million of equity per platform, using a combination of senior industry relationships and a dedicated in-house sourcing team to find deals. With its fund now closed and its team in place, the firm is fully capitalized and poised to become a significant new player in the lower-middle market. Its blend of large-firm discipline, entrepreneurial agility, and an unparalleled network gives it a formidable toolkit to begin building its portfolio and delivering on the promise that attracted its impressive roster of initial investors.