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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
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                               AMENDMENT NO. 1 TO
        
                                  FORM 10-K
 
(MARK ONE)
 
      [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998
 
                                       OR
 
      [ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
         FOR THE TRANSITION PERIOD FROM ____________ TO ____________ .
 
                         COMMISSION FILE NUMBER 1-8789
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                       AMERICAN SHARED HOSPITAL SERVICES
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 

                                            
                  CALIFORNIA                                     94-2918118
       (STATE OR OTHER JURISDICTION OF                         (IRS EMPLOYER
        INCORPORATION OR ORGANIZATION)                      IDENTIFICATION NO.)

 
    FOUR EMBARCADERO CENTER, SUITE 3620, SAN FRANCISCO, CALIFORNIA     94111
               (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (415) 788-5300
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
 


       TITLE OF EACH CLASS             NAME OF EACH EXCHANGE ON WHICH REGISTERED
       -------------------             -----------------------------------------
                                 
    COMMON STOCK NO PAR VALUE           AMERICAN STOCK EXCHANGE PACIFIC EXCHANGE

 
        SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: NONE
 
     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]
 
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  [ ]
 
     As of March 15, 1999, the aggregate market value of the common stock held
by non-affiliates of the registrant was approximately $3,286,054.
 
     Number of shares of common stock of the registrant outstanding as of March
15, 1999: 3,972,372.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Portions of the registrant's definitive Proxy Statement for the 1999 Annual
Meeting of its shareholders are incorporated by reference into Part III of this
report.
 
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                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          AMERICAN SHARED HOSPITAL SERVICES
                                          (Registrant)
 
March 29, 1999                            By:      /s/ ERNEST A. BATES
                                            ------------------------------------
                                                      Ernest A. Bates
                                                        Chairman and
                                                  Chief Executive Officer
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant in the capacities and on the dates indicated.
 


                     SIGNATURE                                      TITLE                    DATE
                     ---------                                      -----                    ----
                                                                                  
                /s/ ERNEST A. BATES                      Chief Executive Officer and    March 29, 1999
- ---------------------------------------------------         Chairman of the Board
                  Ernest A. Bates
 
               /s/ WILLIE R. BARNES                        Director and Secretary       March 29, 1999
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                 Willie R. Barnes
 
                /s/ JOHN F. RUFFLE                                Director              March 29, 1999
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                  John F. Ruffle
 
            /s/ STANLEY S. TROTMAN, JR.                           Director              March 29, 1999
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              Stanley S. Trotman, Jr.
 
            /s/ AUGUSTUS A. WHITE, III                            Director              March 29, 1999
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              Augustus A. White, III
 
               /s/ CHARLES B. WILSON                              Director              March 29, 1999
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                 Charles B. Wilson
 
                /s/ CRAIG K. TAGAWA                      Chief Operating Officer and    March 29, 1999
- ---------------------------------------------------        Chief Financial Officer
                  Craig K. Tagawa                      (Principal Accounting Officer)

 
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                               INDEX TO EXHIBITS
 


    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
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     2.1       Securities Purchase Agreement, dated as of March 12, 1998,         *
               by and among Alliance Imaging, Inc.; Embarcadero Holding
               Corp. I; Embarcadero Holding Corp. II; American Shared
               Hospital Services; and MMRI, Inc.(1)........................
     3.1       Articles of Incorporation of the Company, as amended.(2)....       *
     3.2       By-laws for the Company, as amended.(3).....................       *
     4.6       Form of Common Stock Purchase Warrant of American Shared           *
               Hospital Services.(3).......................................
     4.8       Registration Rights Agreement, dated as of May 17, 1995, by        *
               and among American Shared Hospital Services, the Holders
               referred to in the Note Purchase Agreement, dated as of May
               12, 1995 and General Electric Company, acting through GE
               Medical Systems.(3).........................................
    10.1       The Company's 1984 Stock Option Plan, as amended.(5)........       *
    10.2       The Company's 1995 Stock Option Plan, as amended.(6)........       *
    10.3       Form of Indemnification Agreement between American Shared          *
               Hospital Services and members of its Board of
               Directors.(5)...............................................
    10.4       Ernest A. Bates Stock Option Agreement dated as of August          *
               15, 1995.(7)................................................
    10.5       Operating Agreement for GK Financing, LLC, dated as of             *
               October 17, 1995.(3)........................................
    10.6       Amendments dated as of October 26, 1995 and as of December         *
               20, 1995 to the GK Financing, LLC Operating Agreement, dated
               as of October 17, 1995.(4)..................................
    10.7       Amendment dated as of October 16, 1996 to the GK Financing,        *
               LLC Operating Agreement, dated as of October 17, 1995.(1)...
    10.8       Amendment dated as of March 31, 1998 ("Fourth Amendment") to
               the GK Financing, LLC Operating Agreement dated as of
               October 17, 1995............................................
    10.9       Amendment dated as of March 31, 1998 ("Fifth Amendment") to
               the GK Financing, LLC Operating Agreement dated as of
               October 17, 1995............................................
    10.10      Amendment dated as of June 5, 1998 to the GK Financing, LLC
               Operating Agreement dated as of October 17, 1995............
    10.11a     Assignment and Assumption Agreement, dated as of December
               31, 1995, between American Shared Radiosurgery Services
               (assignor) and GK Financing, LLC (assignee).................
    10.11b     Assignment and Assumption Agreement, dated as of November 1,       *
               1995, between American Shared Hospital Services (assignor)
               and American Shared Radiosurgery Services (assignee).(4)....
    10.11c     Amendment Number One dated as of August 1, 1995 to the Lease
               Agreement for a Gamma Knife Unit between The Regents of the
               University of California and American Shared Hospital
               Services. (Confidential material appearing in this document
               has been omitted and filed separately with the Securities
               and Exchange Commission in accordance with Rule 24b-2,
               promulgated under the Securities and Exchange Act of 1934,
               as amended. Omitted information has been replaced with
               asterisks.).................................................

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    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
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    10.11d     Lease Agreement dated as of July 3, 1990 for a Gamma Knife
               Unit between American Shared Hospital Services and The
               Regents of the University of California. (Confidential
               material appearing in this document has been omitted and
               filed separately with the Securities and Exchange Commission
               in accordance with Rule 24b-2, promulgated under the
               Securities and Exchange Act of 1934, as amended. Omitted
               information has been replaced with asterisks.)..............
    10.12      Amendment Number Two dated as of February 6, 1998 to the
               Lease Agreement for a Gamma Knife Unit between UCSF-Stanford
               Health Care and GK Financing, LLC. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.13      Assignment and Assumption Agreement, dated as of February 3,       *
               1996, between American Shared Radiosurgery Services
               (assignor) and GK Financing, LLC (assignee).(4).............
    10.14      Lease Agreement for a Gamma Knife Unit dated as of April 6,
               1994, between Ernest A. Bates, M.D. and NME Hospitals, Inc.
               dba USC University Hospital. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.15      Assignment and Assumption and Agreement dated as of February
               1, 1996 between Ernest A. Bates, M.D. and GK Financing, LLC
               with respect to the Lease Agreement for a Gamma Knife dated
               as of April 6, 1994 between Ernest A. Bates, M.D. and NME
               Hospitals, Inc. dba USC University Hospital. ...............
    10.16      Lease Agreement for a Gamma Knife Unit dated as of October
               31, 1996 between Hoag Memorial Hospital Presbyterian and GK
               Financing, LLC. (Confidential material appearing in this
               document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................

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    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
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    10.17      Addendum to Lease Agreement for a Gamma Knife Unit dated as
               of December 1, 1998 between Hoag Memorial Hospital
               Presbyterian and GK Financing, LLC. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.18      Lease Agreement for a Gamma Knife Unit dated as of October
               29, 1996 between Methodist Healthcare Systems of San
               Antonio, Ltd., dba Southwest Texas Methodist Hospital and GK
               Financing, LLC. (Confidential material appearing in this
               document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................
    10.19      Lease Agreement for a Gamma Knife Unit dated as of April 10,
               1997 between Yale-New Haven Ambulatory Services Corporation
               and GK Financing, LLC. (Confidential material appearing in
               this document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................
    21.        Subsidiaries of American Shared Hospital Services. .........
    23.1       Consent of Grant Thornton, LLP. ............................
    23.2       Consent of Ernst & Young, LLP. .............................
    27.        Financial Data Schedule for the year ended December 31,
               1998. ......................................................

 
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(1) These documents were filed as Exhibits 2.1 and 10.13b, respectively, to the
    registrant's Annual Report on Form 10-K for fiscal year ended December 31,
    1997, which is incorporated herein by this reference.
 
(2) This document was filed as Exhibit 3.1 to registrant's Registration
    Statement on Form S-2 (Registration No. 33-23416), which is incorporated
    herein by this reference.
 
(3) These documents were filed as Exhibits 3.2, 4.6 and 4.8, respectively, to
    registrant's Registration Statement on Form S-1 (Registration No. 33-63721)
    filed on October 26, 1995, which is incorporated herein by this reference.
 
(4) These documents were filed as Exhibits 4.14 and 10.13, respectively, to the
    registrant's Pre-Effective Amendment No. 1 to registrant's Registration
    Statement on Form S-1 (Registration No. 33-63721) filed on March 29, 1996,
    which is incorporated herein by this reference.
 
(5) These documents were filed as Exhibits 10.24 and 10.35 respectively, to
    registrant's Registration Statement on Form S-2 (Registration No. 33-23416),
    which is incorporated herein by this reference.
 
(6) This document was filed as Exhibit A to registrant's Proxy Statement, filed
    on August 31, 1995, which is incorporated herein by this reference.
 
(7) This document was filed as Exhibit B to registrant's Proxy Statement, filed
    on August 31, 1995, which is incorporated herein by this reference.