Fidelity Investments has forged a pact with Credit Suisse that will offer retail clients access to initial public offerings and follow-on deals underwritten by the bank, a partnership that replaces an existing relationship with Deutsche Bank.

The agreement between the Swiss bank and Fidelity comes as US-listed IPOs reach their highest year-to-date levels since 2000. It will give Fidelity's brokerage and family office clients, as well as those working with registered investment advisers in the US, access to new deals underwritten by the bank, the firms said in a statement Monday.