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Blackstone Infrastructure-backed Safe Harbor agrees to acquire MarineMax

August 10, 2026 filing Manager profile

Summary: MarineMax filed an SEC Form 8-K and Exhibit 99.1 saying it entered into a definitive merger agreement under which Safe Harbor-related buyer entities would acquire MarineMax for $53.00 per share in cash, with an enterprise value of about $1.5 billion. The filed press-release exhibit identifies Safe Harbor as a Blackstone Infrastructure portfolio company.

Why it matters: The update may matter to due-diligence readers as a public-company transaction signal involving Blackstone Infrastructure and a marina/storage portfolio platform, while the sources do not support conclusions about closing certainty, regulatory outcome, fund exposure, valuation fairness, returns, suitability, or investment merit.

9AT filing context: Public adviser/profile context reviewed by 9AT maps the lane to Blackstone Management Partners L.L.C. and includes Blackstone Infrastructure Advisors L.L.C. as related infrastructure-platform context. This is identity/background context only; no 13F or Form 5500 context is included for the pending transaction.

Summary

MarineMax filed an SEC Form 8-K saying it entered into a definitive merger agreement with Safe Harbor-related buyer entities. The filed Exhibit 99.1 says Safe Harbor will acquire MarineMax common shares for $53.00 per share in cash, with an enterprise value of about $1.5 billion.

The filed press-release exhibit identifies Safe Harbor as a portfolio company of Blackstone Infrastructure. This post treats the SEC filing package as the controlling support and keeps the transaction framed as pending, subject to approvals and closing conditions.

Why it matters

For due-diligence readers, the useful signal is that Blackstone Infrastructure is publicly linked to a pending acquisition of a listed marine-retail, marina, and storage business through Safe Harbor. Manager-specific transaction announcements can help readers track where an infrastructure platform is appearing by sector, deal status, public-company process, and named operating platform.

The signal is bounded by the filing package. The SEC materials support the agreement, named buyer entities, Safe Harbor relationship, $53.00 per-share cash consideration, approximate enterprise value, and transaction-condition framing. They do not establish closing certainty, regulatory outcome, financing economics beyond source wording, valuation fairness, fund exposure, credit quality, expected returns, suitability, or investment merit.

Source notes

9AT filing context

Public adviser/profile context reviewed by 9AT maps this lane to Blackstone Management Partners L.L.C. and includes Blackstone Infrastructure Advisors L.L.C. as related infrastructure-platform filing-company context. That context supports broad platform identity/background only.

That context should not be used to identify which Blackstone vehicle, fund, or account would have exposure to MarineMax or Safe Harbor. The MarineMax transaction terms, buyer identity, conditions, and timing should remain attributed to the SEC filing package and the filed press-release exhibit.

No 13F or Form 5500 context is included. 9AT did not identify a useful 13F filer/history or Form 5500 angle for this item. Those datasets would not explain the pending acquisition terms, regulatory approvals, shareholder approval, fund exposure, closing probability, valuation fairness, or investment merit.

What to watch

Watch for MarineMax shareholder materials, shareholder-vote timing, regulatory-approval updates, amended merger filings, closing-condition disclosures, Safe Harbor or Blackstone Infrastructure statements, and any later SEC filings that identify buyer entities, financing details, transaction timing, or changed terms.

Until those details are public, coverage should stay centered on the MarineMax SEC filing package and filed press-release exhibit. Filing context should remain limited to Blackstone and Blackstone Infrastructure platform identity rather than implying transaction merit, fund exposure, regulatory outcome, credit quality, or investment advice.

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