UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO.___________________)* Mannatech, Incorporated - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 563771-10-4 -------------------------------------------------------- (CUSIP Number) March 31, 2000 - -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: /X/ Rule 13d-1(b) / / Rule 13d-1(c) / / 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 9 Pages
SCHEDULE 13G CUSIP NO. 563771-10-4 Page 2 of 9 Pages - ------------------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Salomon Smith Barney Inc. - ------------------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) / / (b) / / - ------------------------------------------------------------------------------- (3) SEC USE ONLY - ------------------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ---------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 5,027,999 OWNED BY ---------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ---------------------------------------------------- PERSON (8) SHARED DISPOSITIVE POWER 5,027,999 WITH: - ------------------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,027,999 - ------------------------------------------------------------------------------- (10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) / / - ------------------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 20.2% - ------------------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) BD - -------------------------------------------------------------------------------
SCHEDULE 13G CUSIP NO. 563771-10-4 Page 3 of 9 Pages - ------------------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Salomon Brothers Holding Company Inc - ------------------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) / / (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 5,027,999 OWNED BY ---------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ---------------------------------------------------- PERSON (8) SHARED DISPOSITIVE POWER 5,027,999 WITH: - ------------------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,027,999 - ------------------------------------------------------------------------------- (10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) / / - ------------------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 20.2% - ------------------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) HC - -------------------------------------------------------------------------------
SCHEDULE 13G CUSIP NO. 563771-10-4 Page 4 of 9 Pages - ------------------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Salomon Smith Barney Holdings Inc. - ------------------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) / / (b) / / - ------------------------------------------------------------------------------- (3) SEC USE ONLY - ------------------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - ------------------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ---------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 5,032,099 OWNED BY ---------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ---------------------------------------------------- PERSON (8) SHARED DISPOSITIVE POWER 5,032,099 WITH: - ------------------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,032,099 - ------------------------------------------------------------------------------- (10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) / / - ------------------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 20.2% - ------------------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) HC - -------------------------------------------------------------------------------
SCHEDULE 13G CUSIP NO. 563771-10-4 Page 5 of 9 Pages - ------------------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Citigroup Inc. - ------------------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) / / (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 5,032,099* OWNED BY ---------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ---------------------------------------------------- PERSON (8) SHARED DISPOSITIVE POWER 5,032,099* WITH: - ------------------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,032,099* - ------------------------------------------------------------------------------- (10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) / / - ------------------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 20.2%* - ------------------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) HC - ------------------------------------------------------------------------------- * Includes shares held by the other reporting persons.
Item 1(a). Name of Issuer: Mannatech, Incorporated Item 1(b). Address of Issuer's Principal Executive Offices: 600 S. Royal Lane, Suite 200 Coppell, Texas 75019 Item 2(a). Name of Person Filing: Salomon Smith Barney Inc. ("SSB") Salomon Brothers Holding Company Inc ("SBHC") Salomon Smith Barney Holdings Inc. ("SSB Holdings") Citigroup Inc. ("Citigroup") Item 2(b). Address or Principal Office or, if none, Residence: The address of the principal office of each of SSB, SBHC and SSB Holdings is: 388 Greenwich Street New York, NY 10013 The address of the principal office of Citigroup is: 153 East 53rd Street New York, NY 10043 Item 2(c). Citizenship or Place of Organization: SSB and SSB Holdings are New York corporations. SBHC and Citigroup are Delaware corporations. Item 2(d). Title of Class of Securities: Common Stock Item 2(e). Cusip Number: 563771-10-4 Page 6 of 9 Pages
Item 3. If this Statement is Filed Pursuant to Sections 240.13d-1(b) or 240.13d-2(b) or (c), Check Whether the Person Filing is a(n): (a) [X] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o); (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c); (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c); (d) [ ] Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8); (e) [ ] Investment adviser in accordance with Section 240.13d-1(b)(1)(ii)(E); (f) [ ] Employee benefit plan or endowment fund in accordance with Section 240.13d-1(b)(1)(ii)(F); (g) [X] Parent holding company or control person in accordance with Section 240.13d-1(b)(1)(ii)(G); (h) [ ] Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (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 (15 U.S.C. 80a-3) (j) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(J). Item 4. Ownership. (as of March 31, 2000) (a) Amount beneficially owned: See item 9 of cover pages (b) Percent of Class: See item 11 of cover pages (c) Number of shares as to which the person has: (i) sole power to vote or to direct the vote: (ii) shared power to vote or to direct the vote: (iii) sole power to dispose or to direct the disposition of: (iv) shared power to dispose or to direct the disposition of: See Items 5-8 of cover pages Page 7 of 9 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 person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]. 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. SBHC is the sole stockholder of SSB; SSB Holdings is the sole stockholder of SBHC; and Citigroup is the sole stockholder of SSB Holdings. Item 8. Identification and Classification of Members of the Group. Not Applicable. Item 9. Notice of Dissolution of Group. Not Applicable. Page 8 of 9 Pages
Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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. 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. Dated: April 7, 2000 SALOMON SMITH BARNEY INC. By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary SALOMON BROTHERS HOLDING COMPANY INC By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary SALOMON SMITH BARNEY HOLDINGS INC. By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary CITIGROUP INC. By: /s/ Joseph B. Wollard -------------------------------------------- Name: Joseph B. Wollard Title: Assistant Secretary Page 9 of 9 Pages
EXHIBIT INDEX TO SCHEDULE 13G ----------------------------- EXHIBIT 1 - --------- Agreement among SSB, SBHC, SSB Holdings and Citigroup as to joint filing of Schedule 13G EXHIBIT 2 - --------- Disclaimer of beneficial ownership by SSB Holdings and Citigroup
EXHIBIT 1 --------- AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G -------------------------------------------- Each of the undersigned hereby affirms that it is individually eligible to use Schedule 13G, and agrees that this Schedule 13G is filed on its behalf. Date: April 7, 2000 SALOMON SMITH BARNEY INC. By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary SALOMON BROTHERS HOLDING COMPANY INC By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary SALOMON SMITH BARNEY HOLDINGS INC. By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary CITIGROUP INC. By: /s/ Joseph B. Wollard -------------------------------------------- Name: Joseph B. Wollard Title: Assistant Secretary
EXHIBIT 2 --------- DISCLAIMER OF BENEFICIAL OWNERSHIP ---------------------------------- Each of the undersigned disclaims beneficial ownership of the securities referred to in the Schedule 13G to which this exhibit is attached, and the filing of this Schedule 13G shall not be construed as an admission that any of the undersigned is, for the purpose of Section 13(d) or 13(g) of the Securities Exchange Act of 1934, as amended, the beneficial owner of any securities covered by this Schedule 13G. Date: April 7, 2000 SALOMON SMITH BARNEY HOLDINGS INC. By: /s/ Howard M. Darmstadter -------------------------------------------- Name: Howard M. Darmstadter Title: Assistant Secretary CITIGROUP INC. By: /s/ Joseph B. Wollard -------------------------------------------- Name: Joseph B. Wollard Title: Assistant Secretary