The company plans to use the financing to fund part of its 21.4 billion pending acquisition of GE Biopharma.
The firm will offer €4.4 billion of euro-denominated notes and $900 million in dollar-denominated notes. It will redeem another $4.5 billion in outstanding notes.
The firm said that on Oct. 13 it will redeem all of its outstanding 5 percent unsecured notes due in 2021.
Thermo Fisher Scientific said today that it plans to redeem two classes of senior notes later this month, with a total aggregate principal amount of $1.1 billion.
About $770 million in net proceeds will go toward the repayment of outstanding debt under its senior unsecured revolving credit facility.
The company said it will use the funds to repay the $75 million outstanding under its 2018 Note Purchase Agreement, to expand internationally, and on general operations.
The company plans to use the proceeds to fund the redemption of its outstanding 5.00 percent senior notes due 2020.
The company announced its European subsidiary priced an offering of €6.20 billion ($6.83 billion) in senior notes to fund part of its purchase of GE's Biopharma business.
The company said it will use the proceeds to repay outstanding debts including $300 million in senior notes due April 2019 and for general corporate purposes.
The company said it will use part of the proceeds to repurchase some of its senior notes due in January 2025, and the rest for corporate purposes.