<PAGE>
PROSPECTUS DATED MARCH 6, 2000 PRICING SUPPLEMENT NO. 15 TO
PROSPECTUS SUPPLEMENT REGISTRATION STATEMENT NO. 333-30928
DATED MARCH 15, 2000 AUGUST 23, 2000
RULE 424(b)(3)
Donaldson, Lufkin & Jenrette, Inc.
MEDIUM-TERM NOTES
Due Nine Months or More from Date of Issue
THE MEDIUM-TERM NOTES, AS FURTHER DESCRIBED BELOW AND IN THE PROSPECTUS
SUPPLEMENT UNDER DESCRIPTION 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.
<TABLE>
<S> <C> <C> <C>
Principal Amount: $ 5,000,000 Optional Conversion: N/A
Price To Public: 99.944% Optional Repayment Date: Non-Call/Life
Underwriting Discount: .25%
Percentage To Issuer: 99.694% Business Day Jurisdiction: New York
Settlement Date August 25, 2000 Initial Redemption N/A
(Original Issue Date): Percentage:
Specified Currency: US Dollars Initial Redemption Date: N/A
Authorized Denomination: $1,000 Annual Redemption N/A
Percentage Reduction:
Maturity Date: August 23, 2002 Book Entry Note or B/E
Certificated Note:
Interest Rate: 3 month USD Libor +
27 basis points
First Coupon: $ 87,966.67
Interest Payment Date: Quarterly, 23rd day of Total Amount of OID: N/A
May, Aug., Nov., and
Feb., or as modified
Interest Determination Date: 2 London business days Day Count: Act/360
prior to the Interest
Payment Dates
CUSIP: 25766CCQ5
First Interest Date: November 24, 2000
Paying Agent: The Chase Manhattan
Bank
Settlement: DTC#: 443
</TABLE>
CAPITALIZED TERMS NOT DEFINED ABOVE HAVE THE MEANINGS GIVEN TO SUCH TERMS IN THE
ACCOMPANYING PROSPECTUS SUPPLEMENT.
DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
