Prospectus supplement

Summary

• Parker-Hannifin is offering $525,000,000 of 4.750% notes due 2028, $500,000,000 of 4.875% notes due 2029, $750,000,000 of 5.125% notes due 2031, and $625,000,000 of 5.300% notes due 2033.
• Net proceeds of approximately $2,387,760,000, together with net proceeds from a concurrent 2,025,000,000 Euro notes offering and cash on hand, will repay borrowings under the 364-Day Credit Agreement tied to the FGC Acquisition.
• Parker completed the FGC Acquisition on August 13, 2026 for a cash purchase price of $9.25 billion, funded with Term Loans, commercial paper, and cash on hand.
• After giving effect to the Financing Transactions, at June 30, 2026 Parker would have had approximately $15.8 billion in aggregate principal amount of outstanding indebtedness, versus $8.6 billion outstanding on a consolidated basis at that date.
• Parker also announced the pending CIRCOR Acquisition of CIRCOR International's Commercial and Defense Aerospace business for approximately $2.55 billion in cash, to be financed in part by a planned CIRCOR Credit Agreement of up to $2.0 billion.
• The notes are unsecured senior obligations, redeemable at Parker's option, and repurchasable at 101% of principal upon a change of control triggering event.

Why it mattersThe notes refinance short-term acquisition debt from Parker's $9.25 billion Filtration Group purchase into fixed-rate senior notes. The filing also discloses financing plans for the pending CIRCOR aerospace acquisition.