<PAGE> 1
------------------------------
OMB APPROVAL
------------------------------
OMB Number: 3235-0145
Expires: December 31, 1997
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. )*
DOCUMENTUM INC
-----------------------------------------
(Name of Issuer)
COMMON
-----------------------------------------
(Title of Class of Securities)
256159104
-----------------------------------------
(CUSIP Number)
Check the following box if a fee is being paid with this statement [X].
(A fee is not required only if the filing person: (1) has a previous statement
on file reporting beneficial ownership of more than five percent of the class
of securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)
*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 5 pages
<PAGE> 2
CUSIP NO. 256159104 SCHEDULE 13G PAGE 2 OF 5 PAGES
--------------------- ----- -----
(1) NAMES OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
SENECA CAPITAL MANAGEMENT, LLC
94-3239114
---------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [ ]
---------------------------------------------------------------------
(3) SEC USE ONLY
---------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
CALIFORNIA
---------------------------------------------------------------------
(5) SOLE VOTING POWER
NUMBER OF 844,640
SHARES --------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
OWNED BY N/A
EACH --------------------------------------------------------
REPORTING (7) SOLE DISPOSITIVE POWER
PERSON WITH 844,640
--------------------------------------------------------
(8) SHARED DISPOSITIVE POWER
N/A
--------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
844,640
---------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
SHARES* [ ]
---------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.8%
---------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
IA
---------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE> 3
CUSIP NO. 256159104 SCHEDULE 13G PAGE 3 OF 5 PAGES
--------------------- ----- -----
ITEM 1.
(a) Name of Issuer DOCUMENTUM INC
(b) Address of Issuer's Principal Executive Offices 5671 GIBRALTAR DRIVE,
PLEASANTON, CA 94588-8547
ITEM 2.
(a) Name of Person Filing SENECA CAPITAL MANAGEMENT, LLC
(b) Address of Principal Office or, if none, RESIDENCE 909 MONTGOMERY
ST., #500, SAN FRANCISCO, CA 94133
(c) Citizenship USA
(d) Title of Class of Securities COMMON
(e) CUSIP Number 256159104
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b), OR 13d-2(b),
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
(e) [X] Investment Adviser 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 Section 240.13d-1(b)(1)(ii)(F)
(g) [ ] Parent Holding Company, in accordance with Section
240.13d-1(b)(ii)(G)(Note: See Item 7)
(h) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(H)
ITEM 4. OWNERSHIP
If the percent of the class owned, as of December 31 of the year covered
by the statement, or as of the last day of any month described in Rule
13d-1(b)(2), if applicable, exceeds five percent, provide the following
information as of that date and identify those shares which there is a right to
acquire.
(a) Amount Beneficially Owned 844,640
(b) Percent of Class 5.8%
<PAGE> 4
CUSIP NO. 256159104 SCHEDULE 13G PAGE 4 OF 5 PAGES
-------------------- ----- -----
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 844,640
(ii) shared power to vote or to direct the vote N/A
(iii) sole power to dispose or to direct the disposition of 844,640
(iv) shared power to dispose or to direct the disposition of N/A
Instruction: For computations regarding securities which represent a right to
acquire an underlying security see Rule 13d-3(d)(1).
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 person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following [ ]
Instruction: Dissolution of a group requires a response to this item.
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
If any other person is known to have the right to receive or the power to
direct the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the
beneficiaries of employee benefit plan, pension fund or endowment fund is not
required.
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
If a parent holding company has filed this schedule, pursuant to Rule
13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the
identity and the Item 3 classification of the relevant subsidiary. If a parent
holding company has filed this schedule pursuant to Rule 13d-1(c), attach an
exhibit stating the identification of the relevant subsidiary.
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
If a group has filed this schedule pursuant to Rule 13d-1(b)(ii)(H), so
indicate under Item 3(h) and attach an exhibit stating the identity and Item 3
classification of each member of the group. If a group has filed this schedule
pursuant to Rule 13d-1(c), attach an exhibit stating the identity of each
member of the group.
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Notice of dissolution of a group may be furnished as an exhibit stating
the date of the dissolution and that all further filings with respect to
transactions in the security reported on will be filed, if required, by members
of the group, in their individual capacity. See Item 5.
ITEM 10. CERTIFICATION
The following certification shall be included if the statement is filed
pursuant to Rule 13d-1(b):
By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.
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.
2-12-98
---------------------------------
Date
/s/ SANDRA J. WESTHOFF
---------------------------------
Signature
Sandra J. Westhoff COO
---------------------------------
Name/Title
<PAGE> 5
CUSIP NO. 256159104 SCHEDULE 13G PAGE 5 OF 5 PAGES
--------------------- ----- -----
The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.
Note: Six copies of this statement, including all exhibits, should be filed
with the Commission.
ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)
ITEM 5. NOT APPLICABLE.
ITEM 6. KNOWN PERSONS HAVE THE RIGHT TO RECEIVE PROCEEDS FROM THE SALE OF SUCH
SECURITIES; SUCH INTEREST AMOUNT TO LESS THAN 5% OF THE CLASS.
ITEM 7. NOT APPLICABLE.
ITEM 8. NOT APPLICABLE.
ITEM 9. NOT APPLICABLE.
