TRANSPORT CORPORATION OF AMERICA INC
SC 13G, 1995-02-13
TRUCKING & COURIER SERVICES (NO AIR)
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<PAGE>   1
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                  SCHEDULE 13G
 
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (AMENDMENT NO.    )*
 
                     Transport Corporation of America, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
 
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
 
                                    8938P102
- --------------------------------------------------------------------------------
                                 (CUSIP Number)
 
Check the following box if a fee is being paid with this /X/ 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 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).
 
                        (Continued on following page(s))
 
                               Page 1 of 5 Pages
 
SEC 1745 (10-85)
<PAGE>   2
 
                                      13G
CUSIP NO. 8938P102
                                                               PAGE 2 OF 5 PAGES
 
<TABLE>
<S>   <C>
- --------------------------------------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      Massachusetts Financial Services Company ("MFS")
        I.R.S. Identification No.:   04-2747644
- --------------------------------------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 
      (a)  / /       (b)  / /
- --------------------------------------------------------------------------------------------------------------
  3   SEC USE ONLY
- --------------------------------------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION
 
      Delaware
- --------------------------------------------------------------------------------------------------------------
      NUMBER OF      5     SOLE VOTING POWER
       SHARES              692,516 shares of common stock
    BENEFICIALLY     -----------------------------------------------------------------------------------------
      OWNED BY       6     SHARED VOTING POWER
        EACH               
      REPORTING      -----------------------------------------------------------------------------------------
       PERSON        7     SOLE DISPOSITIVE POWER
        WITH               692,516 shares of common stock
                     -----------------------------------------------------------------------------------------      
                     8     DISPOSITIVE POWER
                           
- --------------------------------------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      692,516 of which shares are also beneficially owned by MFS Series Trust II --
       MFS Emerging Growth Fund as well as MFS (see page 3).
- --------------------------------------------------------------------------------------------------------------
 10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------------------------------------
 11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
      10.9%
- --------------------------------------------------------------------------------------------------------------
 12   TYPE OF REPORTING PERSON*
      IA
- --------------------------------------------------------------------------------------------------------------
 

- --------------------------------------------------------------------------------------------------------------
</TABLE>
 
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   3
 
CUSIP NO. 8938P102
                                      13G
                                                               PAGE 3 OF 5 PAGES
<TABLE>
<S>   <C>
- --------------------------------------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      MFS Series Trust II -- MFS Emerging Growth Fund ("MEG")
      I.R.S. Identification No.:   04-6551722
- --------------------------------------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 
      (a)  / /       (b)  / /
- --------------------------------------------------------------------------------------------------------------
  3   SEC USE ONLY
- --------------------------------------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION
 
      Massachusetts
- --------------------------------------------------------------------------------------------------------------
      NUMBER OF      5     SOLE VOTING POWER
       SHARES
    BENEFICIALLY     -----------------------------------------------------------------------------------------
      OWNED BY       6     SHARED VOTING POWER
        EACH
      REPORTING      -----------------------------------------------------------------------------------------
       PERSON        7     SOLE DISPOSITIVE POWER
        WITH
                     -----------------------------------------------------------------------------------------
                     8     SHARED DISPOSITIVE POWER

- ---------------------------------------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      692,516 shares which are also beneficially owned by MFS as well as MEG
      (see page 2).
- --------------------------------------------------------------------------------------------------------------
 10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------------------------------------
 11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
      10.9%
- --------------------------------------------------------------------------------------------------------------
 12   TYPE OF REPORTING PERSON*
      IV
- --------------------------------------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------------------------------------
</TABLE>
 
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   4
 
SCHEDULE 13G                                                   Page 4 of 5 Pages
 
<TABLE>
<S>         <C>    <C>
Item 1:     (a)    Name of Issuer:
                   Transport Corporation of America, Inc.
            (b)    Address of Issuer's Principal Executive Offices:
                   c/o Jon A. Dobson
                   Lindquist & Vennum PLLP
                   4200 IDS Center
                   80 South Eighth Street
                   Minneapolis, MN 55402
Item 2:     (a)    Name of Person Filing:
                   Massachusetts Financial Services Company ("MFS")*
            (b)    Address of Principal Business Office or, if none, Residence:
                   For MFS and MEG:
                   500 Boylston Street
                   Boston, MA 02116
            (c)    Citizenship:
                   For MFS, see Item 4 on page 2; for MEG, see Item 4 on Page 3
            (d)    Title of Class of Securities:
                   Common Stock
            (e)    CUSIP Number:
                   8938P102
Item 3:            For MFS, see Item 12 on page 2; for MEG, see Item 12 on page 3
Item 4:     (a)    Amount Beneficially Owned:
                   For MFS, see Item 9 on page 2; for MEG, see Item 9 on page 3
            (b)    Percent of Class:
                   For MFS, see Item 11 on page 2; for MEG, see Item 11 on page 3
            (c)    Number of shares as to which such person has:
                   See Items 5 and 7 on page 2
</TABLE>
 
- ---------------
* This Schedule 13G is filed pursuant to Rule 13d-1(f) on behalf of MFS Series
  Trust II -- MFS Emerging Growth Fund ("MEG") (see page 3 and Exhibit 1
  attached hereto).
<PAGE>   5
 
SCHEDULE 13G                                                   Page 5 of 5 Pages
 
<TABLE>
<S>                <C>
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:
                   INAPPLICABLE
Item 7:            Identification and Classification of the Subsidiary Which Acquired
                   the Security Being Reported on By the Parent Holding Company:
                   INAPPLICABLE
Item 8:            Identification and Classification of Members of the Group:
                   INAPPLICABLE
Item 9:            Notice of Dissolution of Group:
                   INAPPLICABLE
Item 10:           Certification:
</TABLE>
 
         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.
         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: February 6, 1995
 
Massachusetts Financial Services Company
 
   
By:       ARNOLD D. SCOTT
    ------------------------------
          Arnold D. Scott
 Senior Executive Vice President,
      Secretary and Director
<PAGE>   6
 
                                                                       EXHIBIT 1
 
                     MFS EMERGING GROWTH FUND, A SERIES OF
                              MFS SERIES TRUST II
               500 BOYLSTON STREET - BOSTON - MASSACHUSETTS 02116
                                 617 - 954-5000
 
                                        February 8, 1994
 
Massachusetts Financial Services Company
500 Boylston Street
Boston, MA 02116
 
      Re:   Rule 13d-1
 
Gentlemen:
 
      This letter is to memorialize our agreement that you shall file all
statements on Schedule 13G required to be filed on behalf of MFS Emerging Growth
Fund, a series of MFS Series Trust II, pursuant to Rule 13d-1 under the
Securities Exchange Act of 1934. If the foregoing is acceptable to you, please
sign and return to us the enclosed copy of this letter.
 
                                        Very truly yours,

                                        W. THOMAS LONDON

                                        W. Thomas London 
                                        Treasurer
 
The foregoing is acceptable.
 
MASSACHUSETTS FINANCIAL SERVICES COMPANY
 
            
By:         ARNOLD D. SCOTT
    --------------------------------
            Arnold D. Scott
         Senior Executive Vice 
              President,
         Secretary and Director


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