GATX CORP — Form 8-K

On June 30, 2026, GATX Corporation exercised its first call option under the Call Option Agreement dated January 1, 2026, to acquire an additional interest in GABX Leasing Holding LLC (the 'Blocker'), indirectly increasing GATX's ownership in the underlying joint venture (GABX Leasing LLC) from 30% to approximately 33.535%. Concurrent with the exercise, the Blocker's LLC agreement was amended and restated to admit GATX as a member with joint approval rights over fundamental matters (amendments, equity issuances, debt, capital calls, major transactions). Brookfield (Michigan U.S. Holdings LP) remains Managing Member. GATX holds 25 total call options under the agreement, capable of reaching 100% ownership if fully exercised.