<PAGE>
PROSPECTUS DATED MARCH 12, 1999 PRICING SUPPLEMENT NO. 18 TO
PROSPECTUS SUPPLEMENT REGISTRATION STATEMENT NO. 333-73405
DATED APRIL 15, 1999 DECEMBER 3, 1999
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: $ 125,000,000 Optional Conversion: N / A
Price To Public: 100.0000 % Notice Date: N / A
Underwriting Discount: 0.15000 %
Proceeds To Issuer: 99.85000 % Conversion Date: N / A
Settlement Date December 7, 1999 Interest Rate: N / A
(Original Issue Date):
Specified Currency: US Dollars Day Count: N / A
Authorized Denomination: $1,000 Interest Payment Dates: N / A
Maturity Date: January 8, 2001 First Payment: N / A
Interest Rate: 6.4500 % Optional Repayment Date: Non-Call / Life
Initial Redemption Date: N / A
Day Count: Actual/360 Initial Redemption N / A
Percentage:
Interest Payment Dates: At Maturity (January 8, Annual Redemption N / A
2001) Percentage Reduction:
Interest Determination Date: N/A Book Entry Note or B / E
Certificated Note:
First Interest Payment: January 8, 2001 Total Amount of OID: N / A
Settlement: DTC#: 443 CUSIP: 25766CBN3
</TABLE>
Capitalized terms not defined above have the meanings given to such terms in the
accompanying Prospectus Supplement.
DONALDSON, LUFKIN & JENRETTE
SECURITIES CORPORATION
