Ex-Blackstone Partners Launch $400M Fund With David Blitzer

Two former Blackstone executives have officially left the mega-fund world behind. Isaac Harrouche and Mike Berlin announced the final close of their debut fund at $400 million, with billionaire investor David Blitzer signing on as anchor investor and strategic partner. The fund targets control buyouts in the North American lower mid-market — companies generating $10 million to $50 million in EBITDA.

The close marks a clean break from the Blackstone playbook. While their former employer deploys billions per deal, Harrouche and Berlin are building a firm designed for the $50 million to $200 million equity check range — a segment they argue offers better risk-adjusted returns and less competition from the mega-funds that have migrated upmarket in recent years.

Blitzer's involvement isn't just capital. The founder of Dynamo Software and co-owner of multiple sports franchises brings operational expertise and a network that matters when you're trying to source proprietary deals below the institutional radar. According to the announcement, he'll work directly with the firm on deal origination and portfolio company support — not the passive LP role most anchors play.

The fundraise wasn't without friction. Launched in mid-2024, the fund took roughly 18 months to close — longer than the 12-month sprint typical of sponsor-backed spinouts. LPs have grown cautious on emerging managers, particularly those without a standalone track record. Harrouche and Berlin leaned heavily on their Blackstone tenure and early portfolio performance to get across the line.

Harrouche and Berlin both spent over a decade at Blackstone, working primarily within the firm's tactical opportunities and corporate private equity groups. They led deals across industrials, business services, and niche manufacturing — sectors where operational improvement, not financial engineering, drives returns.

But Blackstone's fund sizes have ballooned. The firm's latest flagship buyout fund closed at $30.4 billion in 2022, pushing minimum deal sizes well into the billion-dollar range. For investment professionals who cut their teeth on $100 million equity checks, the mega-fund model leaves little room to lead transactions or own outcomes.

"We spent years working on deals where we could implement change quickly and see results in 18 months, not five years," Harrouche said in the announcement. "As fund sizes grew, so did deal complexity and hold periods. We wanted to get back to what we loved — hands-on operational work with founder-owned businesses."

The lower mid-market also offers structural advantages that large funds can't access. Family-owned businesses and founder-led companies dominate the segment, and most sellers prioritize certainty and speed over price maximization. That creates opportunities for firms that can move quickly and offer operational partnership rather than just capital.

David Blitzer's participation is the headline. The Dynamo Software founder built and sold a financial technology platform used by over 1,000 investment firms globally. He's also a prolific sports investor — co-owning the Philadelphia 76ers, New Jersey Devils, and Crystal Palace FC, among other franchises.

His background in operational software and portfolio management gives him an unusual lens on private equity infrastructure. Dynamo's platform tracks LP relationships, deal pipelines, and portfolio performance for hundreds of GPs. Blitzer knows what works and what doesn't because he's seen the data across the industry.

According to sources familiar with the partnership structure, Blitzer committed a substantial anchor check and will serve on the fund's advisory board. He's also expected to introduce the firm to potential add-on acquisition targets and help portfolio companies implement performance management systems — a direct carryover from his Dynamo playbook.

The LP base skews toward institutional investors — pension funds, endowments, and insurance companies — with a meaningful allocation from family offices and funds-of-funds focused on emerging managers. The fund did not disclose specific LP names, but sources indicate participation from at least two top-quartile fund-of-funds that specialize in first-time fund managers with institutional pedigrees.

Anchor investors provide more than capital. In a first-time fund, the anchor's brand validates the GP's credibility with other LPs. A $100 million commitment from a respected investor signals that someone with access and experience believes in the team. That opens doors with institutional LPs who won't lead a fundraise but will follow if the right anchor is in.

The fund targets North American companies generating $10 million to $50 million in EBITDA — a segment defined by fragmentation, limited institutional ownership, and high seller motivation. These businesses are too small for Blackstone and too large for search funds. That middle ground is where Harrouche and Berlin see the opportunity.

Sector focus leans toward industrial services, niche manufacturing, and B2B distribution — businesses with recurring revenue models, defensible market positions, and clear paths to operational improvement. The firm specifically avoids consumer-facing businesses and technology platforms, which they view as overhyped and overcapitalized in the current market.

The thesis is straightforward: buy founder-owned businesses at reasonable multiples (6x to 9x EBITDA), implement professional management infrastructure, pursue targeted add-on acquisitions, and exit at 10x to 12x EBITDA within four to six years. The math works if you can execute operational improvements and avoid overpaying upfront.

But the lower mid-market is crowded. Over 2,000 private equity firms now target the segment, up from fewer than 1,000 a decade ago, according to PitchBook data. Many are former mega-fund executives making the same migration Harrouche and Berlin just completed. The differentiation challenge is real.

Their edge, they argue, is speed and certainty. While independent sponsors and search funds struggle with financing, and larger funds require multiple approval layers, Harrouche and Berlin can move from LOI to close in 60 to 90 days. That matters when competing for proprietary deals sourced directly from business owners.

Fragmentation is the key. In sectors like HVAC services, specialty manufacturing, and industrial distribution, the top 10 players often control less than 20% of the market. That creates room for roll-up strategies and regional consolidation — the exact playbook Harrouche and Berlin plan to deploy across multiple portfolio companies.

The risk is execution. Roll-ups sound simple but fail frequently. Integration challenges, cultural mismatches, and hidden liabilities destroy value faster than revenue synergies can create it. The firm will need to prove it can operate, not just acquire.

The fund has already deployed roughly $120 million across three platform investments, according to sources familiar with the deals. Two are in industrial services — one focused on commercial facility maintenance, the other on specialty logistics — and the third operates in niche manufacturing with exposure to aerospace and defense end markets.

None of the portfolio companies have been publicly disclosed, which is standard practice for lower mid-market funds that prioritize stealth over press. The firm did confirm it's in active discussions on two additional platform acquisitions and has identified over 30 potential add-on targets across its existing portfolio.

Deal sourcing leans heavily on direct outreach rather than banker-led processes. The firm employs a dedicated business development team that cold-calls business owners, attends industry conferences, and builds relationships with intermediaries who specialize in off-market transactions. That approach mirrors Blackstone's tactical opportunities group, where Harrouche spent the majority of his tenure.

The fund structure includes a traditional 2% management fee and 20% carried interest with an 8% preferred return — industry-standard terms for a first-time fund. The firm did not disclose whether it negotiated any fee step-downs or LP-friendly terms, which have become more common as institutional investors push back on GP economics.

Auction processes have become brutally competitive. When a quality lower mid-market asset hits the market through an investment bank, 40 to 60 buyers receive the CIM. Pricing gets pushed into the double-digit EBITDA multiple range, and returns compress. Off-market deals — sourced directly from owners before a formal process launches — avoid that dynamic entirely.

But direct sourcing requires infrastructure. You need people making calls, building databases, and maintaining relationships with business owners who aren't actively selling. That takes time and money, and it doesn't scale the way banker relationships do. Most emerging managers underinvest here. If Harrouche and Berlin get it right, it becomes a sustainable competitive advantage.

The fundraising environment for first-time managers remains challenging despite high-profile successes like this one. According to Preqin, only 22% of debut private equity funds closed at or above their initial target in 2024, down from 38% in 2021. LPs have shifted capital toward established managers with proven track records, leaving emerging managers to fight for a shrinking pool of risk-tolerant capital.

Harrouche and Berlin had advantages most first-timers don't. Their Blackstone pedigree opened doors. Blitzer's anchor commitment provided credibility. Early portfolio performance gave LPs evidence that the strategy works. Even with all that, they took 18 months to close a $400 million fund — a size that would have been a 12-month sprint in 2021.

The message to other emerging managers: brand matters, anchors matter, and early execution matters. If you don't have at least two of those three, you're looking at a multi-year fundraise or a failed launch.

For LPs, the calculus is shifting. Emerging managers offer access to less-picked-over markets and closer GP-LP alignment, but they also carry higher operational risk and less proven infrastructure. The firms that succeed will be those that combine institutional discipline with entrepreneurial execution — exactly the balance Harrouche and Berlin are trying to strike.

The fund targets a 2.5x to 3.0x gross multiple of invested capital (MOIC) and a 20% to 25% gross IRR — in line with top-quartile lower mid-market buyout funds over the past decade. Achieving those returns requires disciplined entry multiples, operational value creation, and timely exits.

The risk is the exit environment. Lower mid-market companies face a narrower buyer universe than large-cap assets. Strategic acquirers dominate, but their appetite fluctuates with economic cycles and access to financing. Secondary buyouts — selling to another private equity firm — remain an option, but pricing often disappoints relative to GP expectations.

The fund's target returns exceed the historical median for the segment, which means they need to execute better than most of their peers. That's the bet LPs are making — that Blackstone-trained operators with hands-on sector expertise can outperform the broader market.

But the data also shows how hard it is. Lower mid-market funds have underperformed large-cap buyout funds over the past decade, driven by multiple compression, integration challenges, and limited exit optionality. The firms that succeed are those that drive real operational improvements — not just financial engineering.

With the fund closed, the focus shifts to deployment. The firm plans to invest across six to eight platform companies over the next 24 to 36 months, with an additional 15 to 20 add-on acquisitions layered in across the portfolio. That pace is aggressive but achievable if the deal pipeline holds.

Hiring will be a priority. The firm currently employs five investment professionals and two operations partners. Scaling to a dozen-plus deals requires at least three to five additional hires, split between deal execution and portfolio support. Finding talent that can operate at Blackstone speed without Blackstone resources is the challenge.

Longer-term, the question is Fund II. Most emerging managers need to deploy 60% to 70% of Fund I and show strong early performance before they can credibly fundraise for a successor vehicle. That puts the Fund II launch somewhere in 2028 or 2029 — assuming the portfolio performs.

If it doesn't, the firm becomes another cautionary tale in a market littered with them. Emerging managers that fail to deliver on Fund I rarely get a second chance.

Harrouche and Berlin are part of a broader migration. Over the past five years, more than 200 senior private equity professionals have left mega-funds to launch their own firms, according to data compiled by Private Equity International. Apollo, KKR, Carlyle, and Blackstone have all seen talent walk out the door to start lower mid-market and middle-market shops.

The drivers are consistent: autonomy, carry, and deal size. Senior professionals at mega-funds often work on one or two deals per year with minimal direct impact. Launching a firm means leading every transaction, owning every decision, and capturing a much larger share of the economic upside.

But the trade-off is infrastructure. Mega-funds provide deal flow, operational resources, portfolio company expertise, and LP relationships that take decades to build. Emerging managers have to construct all of that from scratch while simultaneously deploying capital and generating returns. Most don't make it.

The ones that do — firms like Harrouche and Berlin's — have three things in common: institutional pedigrees that open doors, anchor investors who provide credibility, and early portfolio performance that proves the model works. Without all three, the odds are long.