Private Equity

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Industrial Growth Partners

Industrial Growth Partners is a San Francisco-based private equity firm focused exclusively on middle-market industrial buyouts.

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Industrial Growth Partners

Industrial Growth Partners was founded in 1997 in San Francisco by William Drew, Roger Miller, and Andrew Valentine, three investors who built their careers identifying value in the kinds of precision manufacturing and industrial service businesses that broad-market generalists often overlook. The firm has raised five institutional private equity funds, closing Fund V at $850 million in 2018 (per Buyouts, 2018). IGP invests solely in lower-middle-market industrial companies, a focus maintained with unusual consistency for more than two decades. The firm pursues control buyouts of North American industrial businesses across engineered products, specialty services, and niche manufacturing. IGP targets companies with $5 million to $25 million in EBITDA and enterprise values between $50 million and $300 million. The strategy spans aerospace and defense components, energy services and equipment, transportation and logistics, and high-performance materials. Confirmed portfolio investments have included Petersen Precision Engineering, a provider of precision components for aerospace, medical, and semiconductor end markets, and related industrial assets in flow control and specialty fabrication (per public record). IGP structures its investments as control equity, with management teams retaining meaningful ownership alongside the fund. IGP operates from its San Francisco headquarters with a dedicated team focused on origination, operational partnerships, and portfolio oversight. In September 2024, the firm closed Industrial Growth Partners VI at $1.1 billion, exceeding its target and marking the largest fund in the firm's history (per the firm, 2024). The fund attracted commitments from public pension funds, endowments, and family offices, reflecting the institutional market's appetite for disciplined industrial specialists. IGP's partners typically hold board seats at portfolio companies and maintain a deep bench of operating advisors with backgrounds in manufacturing, supply chain, and engineered products. IGP's structural differentiator is a multi-decade refusal to drift from its lower-middle-market industrial mandate — a posture that contrasts with the sector-agnostic or multi-strategy models common at peer firms. The partnership has managed succession internally, with senior partners retaining active investment roles through successive funds, and maintains a flat organizational structure that emphasizes partner-level involvement in every transaction. No philanthropic foundation or adjacent vehicle has been publicly disclosed.

General information

Firm type

Private Equity

Year founded

1997

AUM

$500M—$1.5B (Altss estimate)

Location

Region

North America

Country

United States

City

San Francisco

Corporate office

San Francisco, CA, United States

Principals

William E. Drew

Managing Partner

Andrew C. Valentine

Partner

Roger J. Miller

Partner

Sector focus

Industrial TechManufacturingAerospace & DefenseEnergy Services & EquipmentTransportation & LogisticsSpecialty Materials

Frequently asked questions

What is Industrial Growth Partners' investment focus?

IGP invests exclusively in lower-middle-market industrial businesses based in North America. The firm targets control buyouts of engineered products, specialty services, and niche manufacturing companies with $5 million to $25 million in EBITDA. IGP has maintained this industrial-only mandate since its founding in 1997 and does not deviate into software, healthcare, or consumer sectors.

Who makes investment decisions at IGP?

The firm is led by its three founding partners: William Drew, Roger Miller, and Andrew Valentine. All major investment decisions are made collectively by the partnership. IGP maintains a flat organizational structure with senior partner involvement in every transaction and board seat held by a partner at each portfolio company.

How large is IGP's most recent fund?

IGP closed its sixth institutional fund, Industrial Growth Partners VI, at $1.1 billion in September 2024, exceeding its target (per the firm, 2024). The prior fund, Fund V, closed at $850 million in 2018. The firm has raised five funds since 1997, with Fund VI being the largest in its history.

How does IGP source its deals?

IGP sources investments through a proprietary network of industrial intermediaries, former operating executives, and long-standing relationships with founder- and family-owned businesses. The firm's narrow sector focus — 27 years in the same mandate — creates a competitive advantage in origination by signaling serious intent to sellers who seek a buyer that understands their operations rather than a financial engineer.

Does IGP invest in venture-stage or growth-stage industrial companies?

IGP's strategy is control buyouts of profitable, lower-middle-market industrial companies. The firm does not invest in venture-stage or pre-revenue industrial technology businesses. Its typical target has a demonstrated operating history and requires operational partnership rather than speculative capital.

What industrial sub-sectors does IGP prioritize?

The firm invests across aerospace and defense components, energy services and equipment, transportation and logistics, specialty materials, and high-performance manufacturing. IGP avoids sectors such as software, healthcare services, and consumer goods, adhering strictly to its industrial mandate.

How is the firm structured, and is it still managed by the founders?

IGP remains an independent partnership managed by its original founders — William Drew, Roger Miller, and Andrew Valentine — since 1997. The firm has not sold a stake to an external financial buyer and manages succession internally, with senior partners holding enduring investment roles through each successive fund.

Profile maintained by using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.

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