Who Owns Mirion Company?

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Who owns Mirion Technologies now?

Mirion Technologies (NYSE: MIR) went public via a 2021 SPAC merger sponsored by affiliates of The Goldman Sachs Group, shifting ownership from founder and private equity control to a broadly held public cap table. The company serves nuclear, defense, medical, and research markets.

Key holders include large institutional investors, legacy private equity sponsors and insiders; by FY2024 Mirion reported roughly $1.1B revenue. See Mirion Porter's Five Forces Analysis for strategic context.

Founders and Early Ownership of Mirion centered on a 2005 platform led by Thomas D. Logan to consolidate radiation detection and monitoring assets, financed and controlled primarily by private equity with management retaining minority equity and standard vesting.

Founding Strategy

Thomas D. Logan executed a buy-and-build plan to scale fragmented radiation technologies under one brand.

Initial Sponsor

American Capital, Ltd. provided the majority of initial equity capital and held the controlling stake at inception.

Management Equity

Logan and senior management held minority positions with time-based vesting and performance incentives typical of PE-backed platforms.

Governance

Board control rested with the financial sponsor; economic participation for founders aligned to exit-oriented buy-sell provisions.

Early Financing

Co-invest vehicles and lenders supplemented American Capital to fund acquisitions during the platform build-out.

Ownership Evolution

Ownership shifted through sponsor-led M&A and secondary transactions without public founder disputes in the formative years.

Early ownership structures followed conventional private equity norms: sponsor-controlled governance, minority management equity with vesting, and capital deployed to support a roll-up model that expanded Mirion’s market position.

Key Facts and Context

Founding and early ownership highlights, reflecting Mirion ownership and private equity control dynamics relevant to who owns Mirion and Mirion Technologies ownership history.

• Founded in 2005 by Thomas D. Logan.
• Initial majority equity and control: American Capital, Ltd.; management held minority stakes.
• Equity for management subject to time-based vesting and performance incentives customary for PE-backed platforms.
• Ownership changes driven by sponsor-led acquisitions and co-investor/lender involvement; no public founder disputes reported.

For additional company context and values see Mission, Vision & Core Values of Mirion

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Key events reshaped Mirion ownership: private equity control under American Capital (2005–2015), transition to Charterhouse Capital Partners (2015–2021) with strategic add‑ons, and a public de‑SPAC listing on Oct 20, 2021 (NYSE: MIR) that shifted control toward diversified institutional investors through secondary offerings and index inclusion.

Post‑listing (2022–2025) the shareholder base diversified: large passive managers and active institutions amassed 5%+ stakes while Charterhouse reduced but retained a material minority holding; management ownership remained low‑ to mid‑single digits, aligning incentives without majority control.

Major shareholders and shifts

Ownership evolved from concentrated private equity control to dispersed institutional stewardship, affecting governance and capital allocation priorities.

• Charterhouse-affiliated funds — rolled into IPO, declining from controlling pre‑listing to low‑ to mid‑teens % in 2022–2024, falling further with secondaries
• BlackRock, Inc. — disclosed above the 5% threshold in 2024–2025 via index and active strategies
• The Vanguard Group — disclosed near or above 5% via index funds in 2024–2025
• Other institutional holders — State Street, Wellington, growth and quality active managers; no public holder with majority voting control

Key deal facts and figures: de‑SPAC listing occurred Oct 20, 2021 via GS Acquisition Holdings Corp II (NYSE: GSAH) with a PIPE led by blue‑chip institutions; initial enterprise value positioned Mirion as a multi‑billion dollar platform and FY2024–FY2025 SEC filings show public ownership concentration driven by BlackRock, Vanguard and other 13G filers.

For context on market positioning and customer targeting after these ownership changes see Target Market of Mirion

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Mirion’s board mixes executive leadership and independent directors; CEO Thomas D. Logan sits on the board alongside an independent non‑executive chair and industry operators, with prior sponsor representation reduced as Charterhouse sold down its stake.

Mirion operates a one‑share‑one‑vote common equity structure; no dual‑class or golden share provisions appear in SEC filings through 2025, so voting power tracks economic ownership and larger institutional holders and remaining private equity owners hold the most influence.

Board and Voting Snapshot

Voting aligns with share ownership; governance emphasizes independent oversight, financial discipline, and sector expertise.

• One‑share‑one‑vote common equity—no dual‑class structure
• Largest institutional holders exert outsized influence proportional to holdings
• Charterhouse Capital Partners formerly nominated directors during de‑SPAC; sell‑down reduced sponsor control
• No high‑profile proxy contests reported 2023–2025; shareholder focus on leverage, M&A pacing, margins

For additional context on corporate strategy and ownership evolution, see Marketing Strategy of Mirion.

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Since its public listing, Mirion ownership has shifted from concentrated private-equity control toward broader institutional and passive ownership, with Charterhouse reducing holdings via periodic secondary offerings and free float expanding through 2023–2025.

Capital allocation favored deleveraging, tuck-in M&A (notably building on the Sun Nuclear platform), and limited buybacks; most secondary activity was selling shareholders, limiting primary dilution while driving institutional concentration.

2023–2025 ownership shifts

Charterhouse executed staged secondary offerings; passive funds increased holdings, raising institutional concentration without a single controlling shareholder.

Institutional composition

Top 13F filings through 2025 show BlackRock, Vanguard and State Street among largest reported holders, reflecting index-driven ownership gains.

Capital and M&A priorities

Management prioritized deleveraging and targeted tuck-ins in nuclear instrumentation and medical QA, with disciplined M&A and adj. EBITDA growth guidance.

Industry ownership trends

Mirion followed sector patterns: legacy private-equity exits over a 2–4 year post-IPO window, indexation-driven passive ownership growth, and activist interest focused on margin and portfolio simplification.

Potential near-term catalysts for ownership mix include additional tuck-ins, opportunistic secondary sell-downs by remaining sponsor holders, and execution on earnings targets that could attract more long-only active institutional investors; see further detail on company revenue and model in Revenue Streams & Business Model of Mirion.

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