<PAGE>
-------------------------------
/ OMB APPROVAL /
-------------------------------
/ OMB Number: 3235-0145 /
/ Expires: November 30, 1999 /
/ Estimated average burden /
/ hours per response....14.90 /
-------------------------------
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No._____)*
Illuminet Holdings, Inc.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
- --------------------------------------------------------------------------------
(Title of Class of Securities)
452334105
------------------------------
(CUSIP Number)
December 31, 1999
- --------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
[_] Rule 13d-1(b)
[_] Rule 13d-1(c)
[X] Rule 13d-1(d)
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
Page 1 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 2 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Spectrum Equity Investors L.P.
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,368,580
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,368,580
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,368,580
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
4.584%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
PN
- ------------------------------------------------------------------------------
Act but shall be subject to all other provisions of the Act (however, see the
Notes).
Page 2 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 3 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Spectrum Equity Associates L.P.
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
1,368,580
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
1,368,580
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
1,368,580
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
4.584%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
PN
- ------------------------------------------------------------------------------
Page 3 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 4 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Spectrum Equity Investors II, L.P.
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
2,313,760
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
2,313,760
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
2,313,760
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
7.750%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
PN
- ------------------------------------------------------------------------------
Act but shall be subject to all other provisions of the Act (however, see the
Notes).
Page 4 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 5 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Spectrum Equity Associates II, L.P.
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
2,313,760
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
2,313,760
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
2,313,760
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
7.750%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
PN
- ------------------------------------------------------------------------------
Page 5 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 6 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Brion B. Applegate
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
3,682,340
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
3,682,340
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
3,682,340
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
12.335%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
IN
- ------------------------------------------------------------------------------
Page 6 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 7 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
William P. Collatos
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
3,682,340
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
3,682,340
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
3,682,340
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
12.335%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
IN
- ------------------------------------------------------------------------------
Page 7 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 8 of 18
- ----------------------- -----------------
- ------------------------------------------------------------------------------
NAMES OF REPORTING PERSONS
1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Kevin J. Maroni
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
2 (a) [_]
(b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
United States
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF -0-
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
2,313,760
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING -0-
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
2,313,760
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
2,313,760
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10 (SEE INSTRUCTIONS)
[_]
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
7.750%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
IN
- ------------------------------------------------------------------------------
Page 8 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 9 of 18
- ----------------------- -----------------
Item 1(a). Name of Issuer: Illuminet Holdings, Inc.(the "Issuer").
--------------
Item 1(b). Address of Issuer's Principal Executive Offices:
-----------------------------------------------
4501 Intelco Loop, S.E., Lacey, WA 98503
Item 2(a). Names of Persons Filing: Spectrum Equity Investors, L.P. ("SEI LP"),
-----------------------
and Spectrum Equity Associates, L.P. ("SEA LP"), which is the sole
general partner of SEI LP; Spectrum Equity Investors II, L.P. ("SEI
II LP"), and Spectrum Equity Associates II, L.P.("SEA II LP"), which
is the sole general partner of SEI II LP, and Messrs. Brion B.
Applegate and William P. Collatos, (the "General Partners"), each of
whom is a general partner of SEA LP and Messrs. Brion B. Applegate,
William P. Collatos, and Kevin J. Maroni, (the "General Partners
II"), each of whom is a general partner of SEA II LP. The persons
named in this paragraph are sometimes referred to herein
individually as a "Reporting Person" and collectively as the
"Reporting Persons.")
Item 2(b). Address of Principal Business Office or, if None, Residence: The
-----------------------------------------------------------
principal business office of the SEI LP, SEA LP, SEI II LP, and SEA
II LP and William P. Collatos and Kevin J. Maroni is One
International Place, 29/th/ Floor, Boston, Massachusetts, 02110. The
principal business office of Brion B. Applegate is 333 Middlefield
Road, Suite 200, Menlo Park, California, 94025.
Item 2(c). Citizenship: Each of SEI LP, SEI II LP, SEA LP, and SEA II LP which
-----------
are limited partnerships formed under the laws of the State of
Delaware. Each of the General Partners is a United States citizen.
Item 2(d). Title of Class of Securities: Common Stock, $.01 par value per
----------------------------
share.
Item 2(e). CUSIP Number: 452334105
------------
Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
------------------------------------------------------------------
check whether the person filing is a:
------------------------------------
(a) [_] Broker or Dealer registered under Section 15 of the
Securities Exchange Act of 1934 (the "Act").
(b) [_] Bank as defined in Section 3(a)(6) of the Act.
(c) [_] Insurance Company as defined in Section 3(a)(19) of the
Act.
(d) [_] Investment Company registered under Section 8 of the
Investment Company Act of 1940.
(e) [_] Investment Advisor registered under Section 203 of the
Investment Advisers Act of 1940.
(f) [_] Employee Benefit Plan, Pension Fund which is subject to the
provisions of the Employee Retirement Income Security Act
of 1974 or Endowment Fund: see Rule 13d-1(b)(1)(ii)(f); of
the Act.
(g) [_] Parent Holding Company, in accordance with Rule 13d-
1(b)(ii)(G) of the Act.
(h) [_] Group, in accordance with Rule 13d-1(b)(1)(ii)(H) of the
Act.
Not Applicable.
Page 9 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 10 of 18
- ----------------------- -----------------
Item 4. Ownership.
---------
(a) Amount Beneficially Owned: SEI LP holds a record 1,368,580
shares of Common Stock and SEI II LP hold of record 2,313,760
shares of Common Stock of the Issuer (the "Record Shares").
SEA LP, as the sole general partner of the SEI LP and SEA II
LP, as the sole general partner of SEI II LP, may be deemed to
beneficially own all the Record Shares. Each General Partner,
as a general partner of SEA LP and SEA II LP, may be deemed to
beneficially own all of the Record Shares.
(b) Percent of Class: 12.335% for certain Reporting Persons (based
on the 29,853,780 shares of Common Stock reported to be
outstanding on September 30, 1999 in the Issuer's 10Q and
including for purposes of calculation of beneficial ownership
the securities of the Issuer held by the SEI LP and SEI II
LP).
(c) Number of shares as to which the person has:
(i) sole power to vote or to direct the vote: no shares
(ii) shared power to vote or to direct the vote:
3,682,340 shares
(iii) sole power to dispose or to direct the disposition of:
no shares
(iv) shared power to dispose or to direct the disposition of:
3,682,340 shares
Each Reporting Person expressly disclaims beneficial ownership of any
securities of the Issuer not held of record by such Reporting Person.
Item 5. Ownership of Five Percent or Less of a Class.
--------------------------------------------
Not Applicable.
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
---------------------------------------------------------------
Not Applicable.
Item 7. Identification and Classification of the Subsidiary Which Acquired
------------------------------------------------------------------
the Security Being Reported on By the Parent Holding Company.
------------------------------------------------------------
Not Applicable.
Item 8. Identification and Classification of Members of the Group.
---------------------------------------------------------
Not Applicable.
Item 9. Notice of Dissolution of Group.
------------------------------
Not Applicable.
Item 10. Certification.
-------------
Not Applicable. This statement on Schedule 13G is not filed pursuant
to Rule 13d-1(b).
Page 10 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 11 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
SPECTRUM EQUITY INVESTORS, L.P.
By: Spectrum Equity Associates, L.P.
Its Sole General Partner
By: ____________________________
General Partner
Page 11 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 12 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
SPECTRUM EQUITY ASSOCIATES, L.P.
By: ____________________________
General Partner
Page 12 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 13 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
SPECTRUM EQUITY INVESTORS II, L.P.
By: Spectrum Equity Associates II, L.P.
Its Sole General Partner
By: _______________________________
General Partner
Page 13 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 14 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
SPECTRUM EQUITY ASSOCIATES II, L.P.
By: ________________________________
General Partner
Page 14 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 15 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
_____________________________________
Brion B. Applegate
Page 15 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 16 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February __, 2000
_____________________________________
William P. Collatos
Page 16 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 17 of 18
- ----------------------- -----------------
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February 14, 2000
/s/ Kevin J. Maroni
------------------------------------
Kevin J. Maroni
Page 17 of 18 pages
<PAGE>
- ----------------------- -----------------
CUSIP No. 452334105 13G Page 18 of 18
- ----------------------- -----------------
Exhibit 1
- ---------
AGREEMENT
---------
Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the beneficial ownership
by each of the undersigned of shares of stock of Illuminet, Inc.
Executed this 14th day of February 2000.
SPECTRUM EQUITY INVESTORS, L.P.
By: Spectrum Equity Associates, L.P.
Its Sole General Partner
By: /s/ William P. Collatos
----------------------------
General Partner
SPECTRUM EQUITY ASSOCIATES, L.P.
By: /s/ William P. Collatos
--------------------------------
General Partner
SPECTRUM EQUITY INVESTORS II, L.P.
By: Spectrum Equity Associates II, L.P.
Its Sole General Partner
By: /s/ William P. Collatos
----------------------------
General Partner
SPECTRUM EQUITY ASSOCIATES II, L.P.
By: /s/ William P. Collatos
--------------------------------
General Partner
/s/ Brion B. Applegate
-------------------------------------
Brion B. Applegate
/s/ William P. Collatos
-------------------------------------
William P. Collatos
/s/ Kevin J. Maroni
-------------------------------------
Kevin J. Maroni
Page 18 of 18 pages