<Page> <Table> PRICING SUPPLEMENT NO. 2 DATED JULY 1, 2002 REGISTRATION STATEMENT NO. 333-71850 (TO PROSPECTUS SUPPLEMENT DATED MAY 16, 2002 FILED PURSUANT TO RULE 424(b)(2) AND PROSPECTUS DATED APRIL 29, 2002) CREDIT SUISSE FIRST BOSTON (USA), INC. MEDIUM-TERM NOTES DUE NINE MONTHS OR MORE FROM DATE OF ISSUE THE MEDIUM-TERM NOTES, AS FURTHER DESCRIBED BELOW AND IN THE ACCOMPANYING PROSPECTUS SUPPLEMENT UNDER "DESCRIPTION OF NOTES", WILL BEAR INTEREST FROM THE DATE OF ISSUANCE UNTIL THE PRINCIPAL AMOUNT THEREOF IS PAID OR MADE AVAILABLE FOR PAYMENT AT THE RATE SET FORTH BELOW. Agent: Credit Suisse First Boston Corporation Principal Amount: 55MM Optional Conversion: N/A Price To Public: 100.00% Optional Repayment Date: Non Call/ Life Underwriting Discount: N/A Percentage To Issuer: 100.00% Business Day Jurisdiction: New York Settlement Date July 1, 2002 Initial Redemption Percentage: N/A (Original Issue Date): Specified Currency: US Dollar Initial Redemption Date: N/A Authorized Denomination: $1,000 and integral Annual Redemption N/A multiples thereof Percentage Reduction: Optional Extension of Maturity: Maturity Date: July 1, 2004 Form of Note: Book Entry Fixed Rate or Floating Rate Note: Floating Rate Note Initial Interest Rate: 2.03 Interest Rate Basis: 3 MONTH LIBOR Maximum/Minimum N/A Initial Interest Reset Date: October 1st 2002 Interest Rate: Interest Reset Date(s): The 1st of each October, January, April, July. Spread to Index: +17 basis points Interest Payment Date: Quarterly. Pays the Specify if Note is indexed, N/A 1st of each October, renewable, dual currency, January, April, July amortizing, or OID, if applicable: and maturity. Subject to the modified following business convention. Interest Determination Date: Quarterly 2 London Day Count: ACT/360 business days prior to interest pay date. Telerate page 3750. CUSIP: 22541FCV6 First Interest Payment Date: October 1st 2002 Settlement: DTC #355 ---------------------------------------------------------------- CREDIT SUISSE FIRST BOSTON </Table>