<PAGE>
Filed Pursuant to
Rule 424(b)(3)
File No. 333-49413
PROSPECTUS SUPPLEMENT NO. 1 DATED SEPTEMBER 29, 1998
TO PROSPECTUS DATED SEPTEMBER 9, 1998
ASPECT DEVELOPMENT, INC.
2,592,918 SHARES
COMMON STOCK
This Prospectus Supplement should be read in conjunction with the
Prospectus dated September 9, 1998 (the "Prospectus"). The table on pages 11
and 12 of the Prospectus setting forth information concerning the Selling
Stockholders is superceded by the following table:
SELLING STOCKHOLDERS
The Selling Stockholders hold Shares that were issued by Aspect in connection
with the Merger. The following table sets forth certain information known to
the Company with respect to beneficial ownership of the Company's Common Stock
by each Selling Stockholder as of February 28, 1998, prior to the commencement
of the offering of the Shares hereunder. In addition, certain of the Selling
Stockholders are venture capital funds, corporations or trusts which may
distribute their shares to their partners, shareholders or trust beneficiaries,
respectively, which distributees may likewise distribute such shares to their
partners, shareholders or trust beneficiaries or any of their respective
distributees. Except as indicated, none of the Selling Stockholders has held
any position or office (other than a non-officer employment relationship) or had
any other material relationship with the Company or any of its affiliates within
the past three years other than as a result of the ownership of the Company's
Common Stock. The Company may amend or supplement this Prospectus from time to
time to update the disclosure set forth herein.
<TABLE>
<CAPTION>
SHARES BENEFICIALLY SHARES OFFERED SHARES BENEFICIALLY
OWNED PRIOR TO THE BY THIS OWNED AFTER
Selling Stockholders OFFERING (1) PROSPECTUS (2) THE OFFERING (1)
- ---------------------------------------------------- ---------------------- --------------- ----------------------
<S> <C> <C> <C>
Aperture Associates, L.P............................ 200,032 183,768 16,264
Christopher W. Beall................................ 20,484 18,820 1,664
Chancellor Venture Capital II, L.P. (3)............. 65,438 60,118 5,320
Sherrie L. Clapp.................................... 500 460 40
Commonwealth Venture Partners II, L.P............... 33,436 30,718 2,718
Drake & Co. for the Account of Citiventure III (3).. 263,130 241,736 21,394
Janet Eden-Harris................................... 3,462 1,122 2,340
Daniel J. Ellis..................................... 4,074 3,744 330
EOS Partners SBIC, L.P.............................. 126,122 115,868 10,254
Frontenac VI LP..................................... 358,582 329,426 29,156
Linda Gartner....................................... 32 30 2
Edward A. Green..................................... 13,044 11,984 1,060
Caroline D. Himes................................... 1,194 1,098 96
J.H. Whitney & Co................................... 53,282 48,950 4,332
Bruce A. Jacquemard................................. 5,094 4,680 414
Thomas S. Kavanagh.................................. 163,076 149,816 13,260
KME Venture III, L.P. (3)........................... 13,764 12,646 1,118
James L. Mann....................................... 5,104 4,690 414
Marquette Venture Partners II, L.P.................. 97,324 89,412 7,912
Venkat A. Mohan..................................... 47,562 43,696 3,866
John C. Morley...................................... 21,420(4) 19,312 2,108(4)
John D. Motycka..................................... 1,630 1,498 132
MVP II Affiliates Fund LP........................... 2,780 2,554 226
</TABLE>
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<TABLE>
<CAPTION>
SHARES BENEFICIALLY SHARES OFFERED SHARES BENEFICIALLY
OWNED PRIOR TO THE BY THIS OWNED AFTER
Selling Stockholders OFFERING (1) PROSPECTUS (2) THE OFFERING (1)
- ---------------------------------------------------- ------------------- -------------- -------------------
<S> <C> <C> <C>
Norwest Equity Partners V........................... 216,212 198,632 17,580
Samuel S. Pendleton................................. 486 448 38
Philadelphia Ventures II, L.P. (5).................. 106,380 97,730 8,650
Philadelphia Ventures Japan II, L.P................. 13,114 12,048 1,066
Robert E. King, Trustee for Heather Pines GS........ 3,334 3,064 270
Robert E. King, Trustee for M. Elizabeth King GS.... 3,334 3,064 270
Robert E. King, Trustee for Robert E. King, Jr. GS.. 3,334 3,064 270
Thomas Smallwood.................................... 336 310 26
Brooke E. Terpening................................. 6,522 5,992 530
The Hill Partnership III............................ 393,388 361,402 31,986
Transition Three Limited Partnership................ 94,134 86,480 7,654
Whitney 1990 Equity Fund L.P........................ 213,132 195,802 17,330
Todd A. Wichers..................................... 376 346 30
Wind Point Partners II, L.P......................... 270,374 248,390 21,984
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</TABLE>
(1) The number and percentage of shares beneficially owned is determined in
accordance with Rule 13d-3 promulgated under the Exchange Act. Under such
rule, beneficial ownership includes any shares as to which the individual
has sole or shared voting or investment power and also any shares which the
individual had the right to acquire within 60 days of the date set forth
above through the exercise of any stock option or other right. Unless
otherwise indicated in the footnotes, each person has sole voting and
investment power (or shares such powers with his or her spouse) with respect
to the shares shown as beneficially owned.
(2) As of the date of this Prospectus, approximately 121,632 shares of Common
Stock have been sold hereunder.
(3) Chancellor LGT Asset Management, Inc. ("Chancellor LGT") is the investment
manager for KME Venture III, L.P., Chancellor Venture Capital II, L.P. and
Drake & Co. for the Account of Citiventure III (the "Chancellor Selling
Stockholders") and other separately managed clients (the "Chancellor LGT
Separate Accounts"). On behalf of the Chancellor Selling Stockholders and
the Chancellor LGT Separate Accounts, Chancellor LGT has full discretion as
to the voting and dispositive power and therefore may have "beneficial"
ownership under the securities laws of 563,532 shares of Common Stock. As of
March 31, 1998, Chancellor LGT had voting and dispositive power over 342,332
shares of Common Stock purchased in privately negotiated transactions for
the account of the Chancellor Selling Stockholders and 221,200 shares of
Common Stock purchased in the public market on behalf of the Chancellor LGT
Separate Accounts of which Drake & Co. for the Account of Citiventure III
holds 8,200 shares.
(4) Includes 400 shares held by McDonald & Co. for the account of John C.
Morley.
(5) Includes shares distributed to the following limited partners of
Philadelphia Ventures II, L.P., each of whom may sell such shares hereunder,
in the pro rata portions indicated: Walter Aikman, 7,036; Charles A. Burton,
7,036 shares; Corestates Employees' Retirement Plan, 1,900 shares;
Crossroads Capital II, L.P., 3,230 shares; Crossroads SF L.P., 3,230 shares;
Crossroads Constitution L.P., 4,560 shares; Boston Safe Deposit and Trust,
Trustee for Southwestern Bell Corporation Master Pension Trust, 2,280
shares; Leslie A. Davies, 474 shares; DRT Industries, Inc. Profit Sharing
Plan, 190 shares; Family Ventures V L.P., 476 shares; First Union Investors,
Inc. (formerly First Fidelity, Inc.), 950 shares; Marian Morris Trust Dated
June 2, 1938, 476 shares; Residuary Trust U/W Leon Levy, 286 shares; Elf
Atochem North America, Inc., 3,800 shares; Meritor Savings Bank Pension Plan
Trust, 2,850 shares; Paul F. Miller, Jr., 950 shares; Thomas Morse, 5,474
shares; Rohm and Haas Pension Trust, 4,560 shares; George Strawbridge, Jr.,
950 shares; University of Pennsylvania, 2,850 shares; Woods Hole
Oceanographic Institution, 950 shares; L. Austin Weeks, 474 shares; Kermit
A. Weeks, 474 shares; Marta S. Weeks, 474 shares; Welles Associates, 474
shares; Wellesley College, 1,426 shares; CoreStates Holdings, Inc. (formerly
Meredian Investments, Inc.), 1,900 shares; State of Wisconsin Investment
Board, 7,600 shares; The Permanent University Fund of the State of Texas,
13,300 shares; The Board of Regents of the University of Texas System, 1,900
shares; Sinking Fund Commission of the City of Philadelphia, 1,900 shares;
Shell Pension, 13,300 shares.
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