SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
(Rule 13d-102)
INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
Under the Securities Exchange Act of 1934
(Amendment No. 5)
Tetra Technologies, Inc.
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
88162F105
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(CUSIP Number)
Check the following box if a fee is being paid with this statement [ ].
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*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).
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CUSIP No. 88162F105 13G Page 2 of 7 Pages
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1. NAME OF REPORTING PERSON(S)
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)
Morgan Stanley Dean Witter & Co.
IRS # 39-314-5972
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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
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3. SEC USE ONLY
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4. CITIZENSHIP OR PLACE OF ORGANIZATION
The state of organization is Delaware.
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NUMBER OF 5. SOLE VOTING POWER
SHARES 0
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6. SHARED VOTING POWER
EACH 777,700
REPORTING --------------------------------------------------------------
PERSON 7. SOLE DISPOSITIVE POWER
WITH 0
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8. SHARED DISPOSITIVE POWER
777,700
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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
777,700
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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
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11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.74%
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12. TYPE OF REPORTING PERSON*
IA, CO
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CUSIP No. 88162F105 13G Page 3 of 7 Pages
Item 1. (a) Name of Issuer:
Tetra Technologies, Inc.
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(b) Address of Issuer's Principal Executive Offices:
25025 I-45 North
Woodlands, TX 77380
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Item 2. (a) Name of Person Filing:
(a) Morgan Stanley Dean Witter & Co.
(b) Morgan Stanley Dean Witter Advisors Inc.
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(b) Address of Principal Business Office, or if None, Residence:
(a) 1585 Broadway
New York, New York 10036
(b) Two World Trade Center
New York, New York 10048
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(c) Citizenship:
Incorporated by reference to Item 4 of the
cover page pertaining to each reporting person.
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(d) Title of Class of Securities:
Common Stock
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(e) CUSIP Number:
88162F105
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Item 3. (a) Morgan Stanley Dean Witter & Co. is (e) an Investment
Adviser registered under Section 203 of the Investment
Advisers Act of 1940.
(b) Morgan Stanley Dean Witter Advisors Inc. is (e) an
Investment Adviser registered under Section 203 of the
Investment Advisers Act of 1940.
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CUSIP No. 88162F105 13-G Page 4 of 7 Pages
Item 4. Ownership.
Incorporated by reference to Items (5) - (9) and (11) of the
cover page.
Item 5. Ownership of Five Percent or Less of a Class.
Inapplicable
Item 6. Ownership of More Than Five Percent on Behalf of Another Person.
Accounts managed on a discretionary basis by Morgan Stanley
Dean Witter & Co. are 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. No such account
holds more than 5 percent of the class.
Item 7. Identification and Classification of the Subsidiary which Acquired
the Security Being Reported on By the Parent Holding Company.
Item 8. Identification and Classification of Members of the Group.
Item 9. Notice of Dissolution of Group.
Item 10. Certification.
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 purpose or effect.
<PAGE>
CUSIP No. 88162F105 13-G Page 5 of 7 Pages
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: April 10, 2000
Signature: /s/ Dennine Bullard
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Name/Title Dennine Bullard / Morgan Stanley & Co. Incorporated
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MORGAN STANLEY DEAN WITTER & CO.
(022597DTI)
<PAGE>
Page 7 of 7 Pages
EXHIBIT 1 -------------------
MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.
SECRETARY'S CERTIFICATE
I, Charlene R. Herzer, a duly elected and Assistant Secretary
of Morgan Stanley Dean Witter & Co., a corporation organized and
existing under the laws of the State of Delaware (the
"Corporation"), certify that Stuart J.M. Breslow, Robert G. Koppenol
and Dennine Bullard are authorized to sign reports to be filed under
Sections 13 and 16 of the Securities Exchange Act of 1934 (the "Act")
pursuant to the following:
(1) On May 31, 1997, the Board of Directors of the
Corporation granted authority to Stuart J.M.
Breslow and Robert G. Koppenol to sign reports to be
filed under Sections 13 and 16 of the Act on behalf of
the Corporation.
(2) On February 23, 2000, Donald G. Kempf, Jr., the Executive
Vice President, Chief Legal Officer and Secretary of the
Corporation, delegated authority to Dennine Bullard to
sign reports to be filed under Sections 13 and 16 of the
Act on behalf of the Corporation. Pursuant to Section
7.01 of the Bylaws of the Corporation and resolutions
approved by the Board of Directors of the Corporation on
September 25, 1998, the Chief Legal Officer is authorized
to enter into agreements and other instruments on behalf
of the Corporation and may delegate such powers to others
under his jurisdiction.
IN WITNESS WHEREOF, I have hereunto set my name and affixed the seal
of the Corporation as of the 1st day of March, 2000.
______________________________
Charlene R. Herzer
Assistant Secretary
