SECURITIES & EXCHANGE COMMISSION
Washington, D.C. 20549
______________________
SCHEDULE 13G*
(Rule 13d-102)
INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO 13d-2(b)
(Amendment No. 1)
Natural Microsystems Corporation
(Name of Issuer)
Common Stock
(Title of Class of Securities)
638882100
(CUSIP Number)
November 4, 1998
(Date of event which requires filing of this statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule 13G is filed:
[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)
(Page 1 of 12 Pages)
________________
*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 purposes 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)
CUSIP No. 638882100 13G Page 2 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Lone Spruce, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
10,711
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
10,711
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
10,711
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.1%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
PN
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 3 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Lone Balsam, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
28,067
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
28,067
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
28,067
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.3%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
PN
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 4 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Lone Sequoia, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
28,068
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
28,068
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
28,068
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.3%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
PN
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 5 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Lone Pine Associates LLC
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
66,846
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
66,846
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
66,846
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.6%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
OO
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 6 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Lone Pine Capital LLC
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
302,454
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
302,454
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
302,454
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.8%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
IA
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 7 of 12 Pages
____________________________________________________________________________
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO.
OF ABOVE PERSONS (ENTITIES ONLY)
Stephen F. Mandel, Jr.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
(a) [X]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
-0-
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
369,300
OWNED BY ___________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
-0-
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
369,300
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
369,300
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
3.4%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON **
IN
_____________________________________________________________________________
** SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 638882100 13G Page 8 of 12 Pages
This Amendment No. 1 amends and restates in its entirety the initial
Schedule 13G (the "Schedule 13G") initially filed on June 9, 1998, as follows:
Item 1(a). Name of Issuer:
The name of the issuer is Natural Microsystems Corporation. (the
"Company").
Item 1(b). Address of Issuer's Principal Executive Offices:
The Company's principal executive offices are located at 100 Crossing
Boulevard, Framingham, Massachusetts 01702.
Item 2(a). Name of Person Filing:
This statement is filed by:
(i) Lone Spruce, L.P., a Delaware limited partnership ("Lone
Spruce"), (PN) with respect to the shares of Common Stock
(defined in Item 2(d) below) directly owned by it;
(ii) Lone Balsam, L.P., a Delaware limited partnership ("Lone
Balsam"), (PN) with respect to the shares of Common Stock
directly owned by it;
(iii) Lone Sequoia, L.P., a Delaware limited partnership ("Lone
Sequoia"), (PN) with respect to the shares of Common Stock
directly owned by it;
(iv) Lone Pine Associates LLC, a Delaware limited liability company
("Lone Pine"), (OO) with respect to the shares of Common Stock
directly owned by Lone Spruce, Lone Balsam and Lone Sequoia;
(v) Lone Pine Capital LLC, a Delaware limited liability company
("Lone Pine Capital"), (IA) which serves as investment manager
to Lone Cypress, Ltd., a Cayman Islands exempted company ("Lone
Cypress"), with respect to the shares of Common Stock directly
owned by Lone Cypress;
(vi) Stephen F. Mandel, Jr. ("Mr. Mandel"), (IN) with respect to the
shares of Common Stock directly owned by each of Lone Spruce,
Lone Balsam, Lone Sequoia and Lone Cypress.
The foregoing persons are hereinafter sometimes
collectively referred to as the "Reporting Persons". Any
disclosures herein with respect to persons other than the
Reporting Persons are made on information and belief after
making inquiry to the appropriate party.
Item 2(b). Address of Principal Business Office or, if None, Residence:
The address of the business office of each of the Reporting Persons is Two
Greenwich Plaza, Greenwich, Connecticut 06830.
CUSIP No. 638882100 13G Page 9 of 12 Pages
Item 2(c). Citizenship:
Lone Spruce, Lone Balsam and Lone Sequoia are limited partnerships
organized under the laws of the State of Delaware. Lone Pine Associates LLC
and Lone Pine Capital LLC are limited liability companies organized under the
laws of the State of Delaware. Mr. Mandel is a United States citizen.
Item 2(d). Title of Class of Securities:
Common Stock, $0.01 par value (the "Common Stock")
Item 2(e). CUSIP Number:
638882100
Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a:
(a) [ ] Broker or dealer registered under Section 15 of 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 Adviser in accordance with Rule
13d-1 (b)(1)(ii)(E),
(f) [ ] Employee Benefit Plan or Endowment Fund in accordance with
13d-1 (b)(1)(ii)(F),
(g) [ ] Parent Holding Company or control person in accordance
with Rule 13d-1 (b)(1)(ii)(G),
(h) [ ] Savings Association as defined in Section 3(b) of the
Federal Deposit Insurance Act,
(i) [ ] Church Plan that is excluded from the definition of an
investment company under Section 3(c)(14) of the
Investment Company Act of 1940,
(j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
If this statement is filed pursuant to Rule 13d-1(c), check this box: [X]
CUSIP No. 638882100 13G Page 10 of 12 Pages
Item 4. Ownership.
A. Lone Spruce, L.P.
(a) Amount beneficially owned: 10,711
(b) Percent of class: 0.1% The percentages used herein and in the
rest of Item 4 are calculated based upon the 10,960,751 shares of Common Stock
issued and outstanding as of July 31, 1998 as reported in the Company's Form
10-Q for the period ending June 30, 1998.
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 10,711
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 10,711
B. Lone Balsam, L.P.
(a) Amount beneficially owned: 28,067
(b) Percent of class: 0.3%
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 28,067
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 28,067
C. Lone Sequoia, L.P.
(a) Amount beneficially owned: 28,068
(b) Percent of class: 0.3%
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 28,068
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 28,068
D. Lone Pine Associates LLC
(a) Amount beneficially owned: 66,846
(b) Percent of class: 0.6%
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 66,846
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 66,846
C. Lone Pine Capital LLC
(a) Amount beneficially owned: 302,454
(b) Percent of class: 2.8%
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 302,454
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 302,454
D. Stephen F. Mandel, Jr.
(a) Amount beneficially owned: 369,300
(b) Percent of class: 3.4%
(c)(i) Sole power to vote or direct the vote: -0-
(ii) Shared power to vote or direct the vote: 369,300
(iii) Sole power to dispose or direct the disposition: -0-
(iv) Shared power to dispose or direct the disposition: 369,300
CUSIP No. 638882100 13G Page 11 of 12 Pages
Item 5. Ownership of Five Percent or Less of a Class.
If this statement is being filed to report the fact that as of the date
hereof, the Reporting Persons have ceased to be the beneficial owner of more
than five percent of the class of securities, check the following: [X]
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
Item 6 is hereby restated as follows:
Not applicable.
Item 10. Certification.
Item 10 is hereby restated as follows:
Each of the Reporting Persons hereby makes the following certification:
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held
for the purpose of or with the effect of changing or influencing the control
of the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose or
effect.
CUSIP No. 638882100 13G Page 12 of 12 Pages
SIGNATURES
After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.
DATED: November 20, 1998
LONE SPRUCE, L.P.
By: Lone Pine Associates LLC,
General Partner
By: /s/ Stephen F. Mandel, Jr.
Stephen F. Mandel, Jr.
Managing Member
LONE BALSAM, L.P.
By: Lone Pine Associates LLC,
General Partner
By: /s/ Stephen F. Mandel, Jr.
Stephen F. Mandel, Jr.
Managing Member
LONE SEQUOIA, L.P.
By: Lone Pine Associates LLC,
General Partner
By: /s/ Stephen F. Mandel, Jr.
Stephen F. Mandel, Jr.
Managing Member
LONE PINE ASSOCIATES LLC,
By: /s/ Stephen F. Mandel, Jr.
Stephen F. Mandel, Jr.
Managing Member
LONE PINE CAPITAL LLC,
By: /s/ Stephen F. Mandel, Jr.
Stephen F. Mandel, Jr.
Managing Member
STEPHEN F. MANDEL, JR.
/s/ Stephen F. Mandel, Jr.
