KING LUTHER CAPITAL MANAGEMENT CORP
SC 13G, 1998-02-13
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                      
                                      
                                 SCHEDULE 13G
                                      
                                      
                  UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (AMENDMENT NO.  )*
                                      

                                   ICO Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                Common Shares
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   44929420
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


Check the following box if a fee is being paid with this statement / /. (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 
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 3 pages
<PAGE>   2

CUSIP No.   44929420                      13G                  Page 2 of 3 Pages



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Luther King Capital Management Corporation     I.R.S. Identification No.
      301 Commerce, Suite 1600                       #75-0163033
      Fort Worth, TX  76102

- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       

      Shares are owned in accounts for the benefit of        (a) / /
      children of certain Luther King Capital Management     (b) /X/
      employees and certain Luther King Capital Management
      employees

- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION

      Fort Worth, Texas

- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER
                                     1,267,600 Luther King Capital Management
                                     7,500 Bryan King   4,000 Mason King     
          NUMBER OF                  5,000 Bryan & Mason King                
                                     12,000 Scot Hollmann                    
           SHARES             -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY
                               
          OWNED BY                   
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER
                                     1,267,600 Luther King Capital Management
          REPORTING                  7,500 Bryan King   4,000 Mason King     
                                     5,000 Bryan & Mason King                
           PERSON                    12,000 Scot Hollmann                    
                               ------------------------------------------------
            WITH               8     SHARED DISPOSITIVE POWER                  
                
                                     
        
- ------------------------------------------------------------------------------- 
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,296,100
        
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                6.0%

- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

                IA

- --------------------------------------------------------------------------------



                     *SEE INSTRUCTION BEFORE FILLING OUT!

                              Page 2 of 3 pages

<PAGE>   3
                                                                    Page 3 of 3


                                 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
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.



                     
                                                    February 11, 1998
                                                  ---------------------
                                                           Date



                                                     /s/ LUTHER KING
                                                  ---------------------
                                                        Signature



                                                  Luther King/President
                                                  ---------------------
                                                        Name/Title


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