Merck closes $6B multi-tranche debt offering: floating-rate notes due 2027 to 5.700% notes due 2055

Merck & Co., Inc.

Offered $500M floating rate notes due 2027, $750M 3.850% notes due 2027, $750M 4.150% notes due 2030.
Offered $1B 4.550% notes due 2032, $1.75B 4.950% notes due 2035, $1.25B 5.700% notes due 2055.
Total aggregate principal amount of the offering is $6 billion, closed on September 9, 2025.
Proceeds use not specified; offering was underwritten public under existing shelf registration.

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