TREX MEDICAL CORP
POS AM, 1998-03-26
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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        As filed with the Securities and Exchange Commission on 

        March 26, 1998                      Registration No. 333-18781
        --------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION 
                             Washington, DC  20549 
                         _______________________________
                         POST-EFFECTIVE AMENDMENT NO. 1
                             ON FORM S-3 TO FORM S-1
                             Registration Statement
                        Under the Securities Act of 1933
                        ________________________________

                            TREX MEDICAL CORPORATION 
             (Exact name of registrant as specified in its charter) 

                     Delaware                       06-1439626
         (State or other jurisdiction of         (I.R.S. Employer
          incorporation or organization)        Identification No.)
                                 _______________

                               36 Apple Ridge Road
                           Danbury, Connecticut 06810
                                 (203) 790-1188
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                                _______________ 

                          Sandra L. Lambert, Secretary 
                            Trex Medical Corporation 
                         c/o Thermo Electron Corporation
                                81 Wyman Street 
                                 P.O. Box 9046 
                       Waltham, Massachusetts  02254-9046 
                                 (781) 622-1000 
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                _______________ 

                                    Copy to:
                             Seth H. Hoogasian, Esq.
                                General Counsel 
                            Trex Medical Corporation 
                         c/o Thermo Electron Corporation
                                81 Wyman Street 
                                 P.O. Box 9046 
                       Waltham, Massachusetts  02254-9046 
                                 (781) 622-1000 
                                 _______________

        Approximate date of commencement of proposed sale to the public:
        From time to time after the effective date of this registration
        statement.
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        If the only securities being requested on this form are being
        offered pursuant to dividend or interest reinvestment plans,
        please check the following box. [  ]

        If any of the securities being registered on this form are to be
        offered on a delayed or continuous basis pursuant to Rule 415
        under the Securities Act of 1933, other than securities offered
        only in connection with dividend or interest reinvestment plans,
        check the following box. [X] 

        If this form is filed to register additional securities for an
        offering pursuant to Rule 462(b) under the Securities Act of
        1933, check the following box and list the Securities Act
        registration statement number of the earlier effective
        registration statement for the same offering. [  ] 

        If this form is a post-effective amendment filed pursuant to Rule
        462(c) under the Securities Act of 1933,  check the following box
        and list the Securities Act registration statement number of the
        earlier effective  registration statement for the same offering.
        [  ] 

        If delivery of the prospectus is expected to be made pursuant to
        Rule 434, check the following box. [  ] 


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<PAGE>





                   SUBJECT TO COMPLETION, DATED MARCH 26, 1998

        PROSPECTUS 
                                 300,000 Shares 

                            TREX MEDICAL CORPORATION

                                  Common Stock 

           This Prospectus relates to 300,000 shares (the "Shares") of
        Common Stock, par value $.01 per share (the "Common Stock"), of
        Trex Medical Corporation ("Trex Medical" or the "Company").  The
        Shares may be offered by certain shareholders of the Company (the
        "Selling Shareholders") from time to time in transactions on the
        American Stock Exchange, in negotiated transactions, through the
        writing of options on the Shares, or a combination of such
        methods of sale, at fixed prices that may be changed, at market
        prices prevailing at the time of sale, at prices related to such
        prevailing market prices or at negotiated prices.  The Selling
        Shareholders may effect such transactions by selling the Shares
        to or through broker-dealers, and such broker-dealers may receive
        compensation in the form of discounts, concessions or commissions
        from the Selling Shareholders and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).  The
        Selling Shareholder and any broker-dealer who acts in connection
        with the sales of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act of
        1933, as amended (the "Securities Act"), and any commissions
        received by them and profit on any resale of the Shares as
        principal might be deemed to be underwriting discounts and
        commissions under the Securities Act.  The Shares were originally
        sold by the Company in private placements pursuant to certain
        Stock Purchase Agreements with the Company dated December 19,
        1996.  See "Selling Shareholders."
                                _______________

        The Common Stock offered hereby involves a high degree of risk. 
                         See "RISK FACTORS" at page 5. 
                                _______________ 

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES
        COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
        STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
          OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE. 
                          ____________________________



           None of the proceeds from the sale of the Shares by the
        Selling Shareholders will be received by the Company.  The
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<PAGE>





        Company has agreed to bear all expenses (other than underwriting
        discounts and selling commissions, and fees and expenses of
        counsel or other advisers to the Selling Shareholders) in
        connection with the registration and sale of the Shares being
        registered hereby.  The Company has agreed to indemnify the
        Selling Shareholders against certain liabilities, including
        liabilities under the Securities Act as underwriter or otherwise.

           The Company is a majority-owned subsidiary of ThermoTrex
        Corporation ("ThermoTrex"), which is a majority-owned subsidiary
        of Thermo Electron Corporation ("Thermo Electron").  The Common
        Stock is traded on the American Stock Exchange under the symbol
        "TXM."  On March 25, 1998 the reported closing price of the
        Common Stock on the American Stock Exchange was $18.3125 per share.


                 The date of this Prospectus is March __, 1998.

                                _________________


           No dealer, salesman or other person has been authorized to
        give any information or to make any representations other than
        those contained or incorporated by reference in this Prospectus
        regarding the Company or the offering made by this Prospectus,
        and, if given or made, such information or representations must
        not be relied upon as having been authorized by the Company or by
        any other person.  Unless otherwise noted, all information
        contained in this Prospectus is as of the date of this
        Prospectus.  Neither the delivery of this Prospectus nor any sale
        or distribution and resale made hereunder shall, under any
        circumstances, create any implication that there has been no
        change in the affairs of the Company since the date hereof.  This
        Prospectus does not constitute an offer to sell or a solicitation
        of any offer to buy any security other than the securities
        covered by this Prospectus, nor does it constitute an offer to or
        solicitation of any person in any jurisdiction in which such
        offer or solicitation may not be lawfully made.

                                  _____________















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                              AVAILABLE INFORMATION

           The Company is subject to the informational requirements of
        the Securities Exchange Act of 1934, as amended (the "Exchange
        Act"), and in accordance therewith files reports, proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").  Such reports, proxy statements
        and other information can be inspected and copied at the public
        reference facilities maintained by the Commission at 450 Fifth
        Street, N.W., Washington, D.C. 20549, and at the following
        Regional Offices of the Commission:  500 West Madison Street,
        Suite 1400, Chicago, Illinois 60661, and 7 World Trade Center,
        Suite 1300, New York, New York 10048.  Copies of such material
        can also be obtained from the Public Reference Section of the
        Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at
        prescribed rates.  The Commission also maintains a Web site that
        contains reports, proxy and information statements and other
        information regarding registrants that file electronically with
        the Commission, including the Company; the address of such Web
        site is http://www.sec.gov.  The Common Stock of the Company is
        listed on the American Stock Exchange, and the reports, proxy
        statements and other information filed by the Company with the
        Commission can be inspected at the offices of the American Stock
        Exchange, 86 Trinity Place, New York, New York  10006.

           This Prospectus, which constitutes part of a Registration
        Statement filed by the Company with the Commission under the
        Securities Act, omits certain of the information contained in the
        Registration Statement.  Reference is hereby made to the
        Registration Statement and to the exhibits relating thereto for
        further information with respect to the Company and the Shares
        offered hereby.  Statements contained herein concerning
        provisions of documents are necessarily summaries of such
        documents, and each statement is qualified in its entirety by
        reference to the applicable document filed with the Commission.

           The Company undertakes to provide without charge to each
        person to whom a copy of this Prospectus has been delivered, on
        the written or oral request of such person, a copy of any or all
        of the documents that have been or may be incorporated in this
        Prospectus by reference, other than exhibits to such documents
        (unless such exhibits are specifically incorporated by reference
        therein).  Requests for such copies should be directed to:
        Sandra L. Lambert, Secretary, Trex Medical Corporation, c/o
        Thermo Electron Corporation, 81 Wyman Street, P. O. Box 9046,
        Waltham, Massachusetts 02254-9046 (telephone: (781) 622-1000).








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                                   THE COMPANY

           The Company is the worldwide leader in the design,
        manufacture and marketing of mammography equipment and minimally
        invasive stereotactic breast biopsy systems used for the
        detection of breast cancer, as well as a leading designer and
        manufacturer of general-purpose radiography (X-ray), cardiac
        catheterization and radiographic/fluoroscopic systems.  A
        mammography system is a dedicated radiographic system designed
        specifically to image breast tissue.  Minimally invasive
        stereotactic breast biopsy systems, which use a digitally guided
        hollow needle to extract breast tissue samples, offer a
        cost-effective, less invasive alternative to open surgery for the
        biopsy of suspicious breast lesions.  The mammography and breast
        biopsy markets are targeted by Lorad, a division acquired by the
        Company in 1992.  The Company has subsequently broadened its
        product base to serve a market estimated at approximately $2.5
        billion by acquiring (i) Bennett X-Ray Corporation ("Bennett"), a
        leading producer of specialty and general-purpose radiographic
        systems, including mammography systems, in September 1995; (ii)
        XRE Corporation, a manufacturer of X-ray imaging systems used for
        cardiac catheterization and angiography, in May 1996; and (iii)
        Continental X-Ray Corporation, a manufacturer of general-purpose
        radiographic systems and specialty radiographic systems including
        radiographic/fluoroscopic products, in September 1996. 

           Unless the context otherwise requires, references in this
        Prospectus to the Company refer to Trex Medical Corporation and
        its subsidiaries and their predecessors.  As of September 27,
        1997, ThermoTrex beneficially owned 79% of the Company's
        outstanding Common Stock, excluding 678,541 shares of Common
        Stock issuable upon the conversion of $8,000,000 principal amount
        of the Company's 4.2% convertible note due 2000, issued to
        ThermoTrex.  The Company's principal executive offices are
        located at 36 Apple Ridge Road, Danbury, Connecticut, and its
        telephone number is (203) 790-1188.


















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                                  RISK FACTORS

           In connection with the "safe harbor" provisions of the
        Private Securities Litigation Reform Act of 1995, the Company
        wishes to caution readers that the following important factors,
        among others, in some cases have affected, and in the future
        could affect, the Company's actual results and could cause its
        actual results in 1998 and beyond to differ materially from those
        expressed in any forward-looking statements made by, or on behalf
        of, the Company.

           Technological Change and New  Products .       The  market  for  the
           --------------------------------------
        Company's products  is  characterized by  rapid  and  significant
        technological change, evolving industry standards and new product
        introductions. Many of the Company's products are technologically
        innovative,   and   require    significant   planning,    design,
        development, and  testing  at  the  technological,  product,  and
        manufacturing   process   levels.   These   activities    require
        significant capital commitments  and investment  by the  Company.
        The high cost of technological innovation is matched by the rapid
        and significant change in the technologies governing the products
        that  are  competitive  in  the  Company's  market,  by  industry
        standards  that  may   change  on  short   notice,  and  by   the
        introduction of new  products and technologies  such as  magnetic
        resonance imaging  and  ultrasound,  which  may  render  existing
        products and technologies uncompetitive or obsolete. There can be
        no  assurance  that   the  Company's   products  or   proprietary
        technologies will not become uncompetitive or obsolete. 

          Risks Associated with  Acquisition Strategy.  The Company's
          -------------------------------------------
        strategy includes the acquisition of businesses and  technologies
        that complement or augment the Company's existing product  lines.
        For example, in October 1995, the Company acquired its Bennett   
        subsidiary,  a   manufacturer   of  general-purpose   X-ray   and
        mammography  equipment;  in  May   1996,  the  Company   acquired
        substantially all  of  the  assets  and  liabilities  of  XRE , a
        manufacturer of X-ray imaging systems  used in the diagnosis  and
        treatment  of  coronary   artery  disease   and  other   vascular
        conditions; in September 1996, the Company acquired substantially
        all of the assets and liabilities of Continental, a  manufacturer
        of general-purpose and specialized X-ray systems; and, in October
        1997, the  Company  acquired  substantially all  of  the  assets,
        subject  to  certain  liabilities,  of  Digitec  Corporation,   a
        manufacturer   of    physiological-monitoring    equipment    and
        digital-image archiving and  networking systems  used in  cardiac
        catheterization procedures. In December 1997, the Company entered
        into a nonbinding letter of  intent to acquire Trophy  Radiologie
        ("Trophy"), a leading French manufacturer of dental X-ray systems
        specializing in  digital technology.  There can  be no  assurance
        that the  Trophy acquisition  will be  successfully completed  or
        that, if such acquisition is completed, the Company will be  able
        to successfully integrate Trophy's  operations with those of  the
        Company and realize the  benefits expected from its  acquisition.

                                        5
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        In addition, promising acquisitions are difficult to identify and
        complete for  a number  of reasons,  including competition  among
        prospective  buyers  and  the  need  for  regulatory   approvals,
        including antitrust approvals. There can be no assurance that the
        Company will be able to complete future acquisitions or that  the
        Company will  be  able  to successfully  integrate  any  acquired
        businesses. In  order to  finance such  acquisitions, it  may  be
        necessary for  the  Company  to raise  additional  funds  through
        public or private  financings. Any equity  or debt financing,  if
        available at all, may be on  terms that are not favorable to  the
        Company and,  in the  case  of equity  financing, may  result  in
        dilution to the Company's stockholders. 

          Intense Competition  .     The Company  encounters and expects to
          -------------------
        continue to  encounter intense  competition in  the sale  of  its
        products. The  Company believes  that the  principal  competitive
        factors affecting  the market  for its  products include  product
        features, product performance and reputation, price, and service.
        The   Company's   competitors    include   large    multinational
        corporations and their operating units, including the GE  Medical
        Systems division of General Electric Company, the Philips Medical
        Systems North  America Company  subsidiary of  Philips N.V.,  the
        Siemens Corporation subsidiary of Siemens AG ("Siemens"), Toshiba
        American  Medical  Systems,  Inc.,  Toshiba  America  MRI,  Inc.,
        Shimadzu, and  Picker  International, Inc.  These  companies  and
        certain of  the Company's  other competitors  have  substantially
        greater  financial,  marketing,  and  other  resources  than  the
        Company. As a result, they may  be able to adapt more quickly  to
        new  or   emerging   technologies   and   changes   in   customer
        requirements, or to devote greater resources to the promotion and
        sale of their products than the Company. Moreover, a  significant
        portion of  the Company's  sales are  to United  States  Surgical
        Corporation  ("U.S.  Surgical")  through  an  original  equipment
        manufacturer ("OEM") arrangement. The  products sold by such  OEM
        customers compete with products  offered by the Company  directly
        and through its independent  dealers. Competition could  increase
        if new  companies enter  the market  or if  existing  competitors
        expand their product lines  or intensify efforts within  existing
        product lines.  There  can be  no  assurance that  the  Company's
        current products,  products  under  development,  or  ability  to
        discover new  technologies will  be sufficient  to enable  it  to
        compete effectively with its competitors. 

          Dependence Upon Significant OEM Relationships.   A significant
          ---------------------------------------------
        portion of the Company's  sales are to  U.S. Surgical through  an
        OEM arrangement. Sales to U.S. Surgical accounted for 17% and 11%
        of  the  Company's  total  revenues  in  fiscal  1997  and  1996,
        respectively.  The  Company's  sales  depend,  in  part,  on  the
        continuation of this and other OEM arrangements and the level  of
        end-user sales by such OEMs. There  can be no assurance that  the
        Company will be able to maintain its existing, or establish  new,
        OEM relationships. 



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          Risks  Associated   With   Pending   and   Threatened   Patent
          --------------------------------------------------------------
        Litigation.   In  April   1992,   Fischer 
        ----------
        ("Fischer") commenced  a lawsuit  in the  United States  District
        Court,  District  of  Colorado,   against  the  Company's   Lorad
        division,  alleging  that  Lorad's  prone  breast-biopsy   system
        infringes  a   Fischer  patent   on  a   precision   mammographic
        needle-biopsy system. The Company expects the trial to begin with
        respect to this  lawsuit before  the end  of fiscal  1998. As  of
        September 27, 1997, the Company had recognized aggregate revenues
        of approximately $107.1  million from sales  of such systems,  of
        which $34.4 million represents sales  prior to October 16,  1995
        (the date on which Lorad was transferred to the Company). The suit
        requests a  permanent injunction,  treble damages,  and attorneys'
        fees and expenses. If  the Company is unsuccessful  in defending 
        this lawsuit, it may be enjoined from manufacturing and selling its
        StereoGuideR system  without a license from  Fischer.  No assurance 
        can be given that the Company will be able to obtain such a license,
        if required, on commercially reasonable terms, if at all. In
        addition,  the Company may be  subject to damages  for past 
        infringement. No assurance  can be given  as to whether  the Company
        will be subject to such damages or, if so, the amount  of damages 
        that  the Company  may be  required to  pay. The  Company believes 
        the costs of litigating this matter may be substantial.
         
          In connection with the organization of the Company, ThermoTrex
        agreed to indemnify the Company for  any and all cash damages  in
        connection with the Fischer lawsuit with respect to sales of  the
        Company's products  occurring prior  to  October 16,  1995,  when
        Lorad  was  transferred  to  the  Company.  Notwithstanding  this
        indemnification, the Company  would be required  to report as  an
        expense the full  amount, including any  reimbursable amount,  of
        any damages in  excess of  the amount  accrued (approximately  $2
        million as  of  September  27, 1997),  with  any  indemnification
        payment  it  receives   from  ThermoTrex  being   treated  as   a
        contribution to shareholders' investment. 

          The Company  is also  aware of  two U.S.  patents  owned by  a
        former employee  that  have  been asserted  against  the  Company
        relating to its  high-transmission cellular  ("HTC") TM    grid used
        with  its  mammography  systems.  If  the  former  employee  were
        successful in  enforcing  such  patents,  the  Company  could  be
        subject to damages  and enjoined from  manufacturing and  selling
        the HTC grid. 

          The unfavorable  outcome  of any  one  or  both of  the  above
        described matters could  have a  material adverse  effect on  the
        Company's  business,   financial   condition   and   results   of
        operations. The  Company's  competitors and  other  parties  hold
        other various patents  and patent applications  in the fields  in
        which the Company operates.  There can be  no assurance that  the
        Company will not be found  to have infringed third-party  patents
        and, in  the event  of such  infringement, the  Company could  be
        required to alter its products or processes, pay licensing  fees,
        or cease  making  and selling  any  infringing products  and  pay
        damages for past infringement. 

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          No Assurance of Development and Commercialization  of Products
          --------------------------------------------------------------
        Under Development.   A number of the Company's potential products
        -----------------
        are  currently  under   development.  There  are   a  number   of
        technological  challenges  that  the  Company  must  successfully
        address to  complete  any  of its  development  efforts.  Product
        development involves  a  high  degree of  risk,  and  returns  to
        investors  are   dependent   upon  successful   development   and
        commercialization of such  products. Proposed  products based  on
        the Company's  technologies will  require significant  additional
        research and development. There can  be no assurance that any  of
        the products currently being developed  by the Company, or  those
        to  be  developed  in  the   future  by  the  Company,  will   be
        technologically feasible or accepted by the marketplace, or  that
        any such development  will be  completed in  any particular  time
        frame. 

          Government Regulation; No Assurance of Regulatory Approval.
          ----------------------------------------------------------
        The Company's products are subject to regulation by the U.S. Food
        and Drug Administration  (the "FDA") and  equivalent agencies  in
        foreign countries. Failure to  comply with applicable  regulatory
        requirements  can  result  in,  among  other  things,  civil  and
        criminal fines, suspensions of approvals, recalls or seizures  of
        products, injunctions, and criminal prosecutions. 

          To date, all of the Company's products have been classified by
        the FDA as Class  II medical devices and  have been eligible  for
        FDA marketing clearance  pursuant to the  FDA's 510(k)  premarket
        notification process, which  is generally shorter  than the  more
        involved premarket approval ("PMA") process. The Company believes
        that most  of  its  currently  anticipated  future  products  and
        substantial modifications to existing  products will be  eligible
        for the 510(k) premarket  notification process. However, the  FDA
        has not  yet classified  full-field digital  mammography  systems
        such as  the  one  being  developed by  the  Company.  While  not
        classifying such systems,  the FDA  has issued  a final  guidance
        document relating  to the  protocol  for marketing  clearance  of
        full-field digital  mammography systems.  This document  suggests
        that  clearance  may  be  obtained  through  an  enhanced  510(k)
        application with more extensive clinical trials. The protocol set
        forth in the final guidance document calls for clinical trials on
        520 subjects  prior  to applying  to  the FDA  for  clearance  to
        commercially market such a system. Accordingly, in December 1997,
        the Company submitted a 510(k) application with clinical data for
        its full-field  digital  mammography  system.  There  can  be  no
        assurance that full-field digital mammography systems will not be
        classified by the FDA as Class III medical devices subject to the
        PMA process. If such systems are classified as Class III devices,
        the Company would be required to file for FDA marketing  approval
        for its  full-field  digital  mammography system  under  the  PMA
        process or the Product Development Protocol ("PDP"), which  would
        likely require  substantial  additional  clinical  trials  before
        being accepted by  the FDA, if  at all. Regardless  of whether  a
        510(k), a PMA, or a PDP is finally accepted by the FDA, there can

                                        8
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        be no assurance that the product will receive marketing clearance
        or approval. In addition, full-field digital mammography  systems
        will be subject  to alternate quality  assurance standards  under
        the Mammography Quality Standards Act. These alternate  standards
        will be  submitted by  the Company  to the  FDA for  review.  The
        Company can make no  prediction as to when  the FDA will  approve
        such standards, if at all. In addition, there can be no assurance
        that the necessary clearances for  any of the Company's  products
        will be obtained on a timely basis, if at all. 

          FDA regulations also require manufacturers of  medical devices
        to adhere to current good manufacturing practices as set forth in
        the quality  system regulation  ("QSR"), which  include  testing,
        quality control,  and  documentation  procedures.  The  Company's
        manufacturing facilities are  subject to  periodic inspection  by
        the FDA. No assurances can be given that the FDA will not in  the
        future find the Company to be in violation of the QSRs. 

          In June  1993,  the  European Economic  Community  issued  the
        European  Directive  Concerning  Medical  Devices  93/42/EEC,   a
        directive applying  essential  requirements  to  the  design  and
        manufacture of medical devices to assure the safety and health of
        the users of  such devices.  The directive  requires all  medical
        devices, including dental  devices, marketed and  sold in  Europe
        after June 14, 1998,  to bear the "CE"  marking to indicate  that
        they comply with the requirements  of the directive. On or  after
        June 14, 1998, any medical device without the CE marking may  not
        be sold in Europe until such time as the CE marking is awarded to
        such product. In addition, failure  to obtain the CE marking  may
        adversely affect a manufacturer's ability to market its  products
        in countries outside of Europe. To date, Trophy has not  obtained
        the right to use  the CE marking  on any of  its products and  no
        assurance can be given  that Trophy will obtain  such right on  a
        timely basis or at all. 

          Healthcare Reform; Uncertainty of Patient Reimbursement.   The
          -------------------------------------------------------
        Federal government  has  in the  past,  and may  in  the  future,
        consider, and certain  state and  local as  well as  a number  of
        foreign governments are considering  or have adopted,  healthcare
        policies intended to curb rising healthcare costs. Such  policies
        include  rationing   of   government-funded   reimbursement   for
        healthcare services and imposing price controls upon providers of
        medical products and  services. The Company  cannot predict  what
        healthcare reform  legislation or  regulation,  if any,  will  be
        enacted in the United States or elsewhere. Significant changes in
        the healthcare  systems in  the United  States or  elsewhere  are
        likely to have a  significant impact over time  on the manner  in
        which the Company conducts its business. In addition, the federal
        government regulates reimbursement of fees for certain diagnostic
        examinations and  capital equipment  acquisition costs  connected
        with  services   to  Medicare   beneficiaries.   Cost-containment
        policies may  have  the  effect  of  reducing  reimbursement  for
        certain procedures, and as a result may inhibit or reduce  demand
        by healthcare providers for products in the markets in which  the

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        Company competes. While  the Company cannot  predict what  effect
        the policies of government entities and other third party  payors
        will have on future sales of the Company's products, there can be
        no assurance that such policies would not have an adverse  impact
        on the operations of the Company. 

          Dependence on Patents  and Proprietary Rights.    The  Company
          ---------------------------------------------
        places considerable  importance  on obtaining  patent  and  trade
        secret protection for significant new technologies, products, and
        processes because of    the length  of time and  expense associated
        with bringing new products through the development and regulatory
        approval process and  to the marketplace.  The Company's  success
        depends in part on whether it can develop patentable products and
        obtain and enforce patent protection for its products both in the
        United States and in other countries. The Company has filed,  and
        intends to file, applications as appropriate for patents covering
        both its products and  manufacturing processes. No assurance  can
        be given  that patents  will  issue from  any pending  or  future
        patent applications owned  by, or  licensed to,  the Company,  or
        that  the  claims  allowed  under  any  issued  patents  will  be
        sufficiently  broad  to  protect  the  Company's  technology.  In
        addition, no assurance can be given that any issued patents owned
        by,  or  licensed  to,  the  Company  will  not  be   challenged,
        invalidated,  or  circumvented,  or   that  the  rights   granted
        thereunder will provide  competitive advantages  to the  Company.
        The Company could incur substantial costs in defending itself  in
        suits brought against  it or in  suits in which  the Company  may
        assert its patent rights  against others. If  the outcome of  any
        such litigation  is unfavorable  to  the Company,  the  Company's
        business and results of operations could be materially  adversely
        affected. 

          The Company relies on  trade secrets and proprietary  know-how
        that it seeks to protect, in part, by confidentiality  agreements
        with its collaborators, employees, and consultants. There can  be
        no assurance that these agreements will not be breached, that the
        Company would have adequate remedies for any breach, or that  the
        Company's trade secrets  will not  otherwise become  known or  be
        independently developed by competitors. 

          Potential Product Liability.     The Company's  business exposes
          ---------------------------
        it to potential product liability  claims, which are inherent  in
        the manufacturing, marketing, and sale of medical devices, and as
        such the Company may face  substantial liability to patients  for
        damages resulting  from  the  faulty  design  or  manufacture  of
        products.  The  Company  currently  maintains   product-liability
        insurance, but there can be no assurance that this insurance will
        provide sufficient coverage  in the  event of a  claim, that  the
        Company will  be able  to maintain  such coverage  on  acceptable
        terms, if at  all, or  that a product-liability  claim would  not
        materially adversely affect the  business or financial  condition
        of the Company.



                                       10
PAGE
<PAGE>





          Risks Associated With International Operations.  International
          ----------------------------------------------
        sales accounted for 17%, 22% and 21% of the Company's revenues in
        fiscal 1997, 1996 and 1995, respectively.  The Company intends to
        continue  to  expand  its  presence  in  international   markets.
        International  revenues  are  subject  to  a  number  of   risks,
        including the following:  agreements may be difficult to  enforce
        and receivables difficult to collect through a foreign  country's
        legal system, foreign custom  ers may have longer  payment cycles;
        foreign countries  may  impose additional  withholding  taxes  or
        otherwise tax  the Company's  foreign income,  impose tariffs  or
        adopt other restrictions on  foreign trade; U.S. export  licenses
        may be difficult  to obtain; and  the protection of  intellectual
        property in foreign countries may be more difficult to enforce. 

          Control by ThermoTrex.  The  Company's stockholders  do not
          ---------------------
        have the right to cumulate  votes for the election of  directors.
        ThermoTrex, which currently  owns 79% of  the outstanding  Common
        Stock of the Company, has the power to elect the entire Board  of
        Directors of  the  Company  and  to  approve  or  disapprove  any
        corporate  actions  submitted   to  a  vote   of  the   Company's
        stockholders. 
         
          Potential Conflicts of Interest.  The Company  may be subject
          -------------------------------
        to potential conflicts of interest from time to time as a  result
        of its  relationship with  Thermo  Electron and  ThermoTrex.  For
        example, conflicts may arise in the development and licensing  of
        digital detector  technology by  ThermoTrex to  the Company,  the
        manufacture of digital  detectors by ThermoTrex  for sale to  the
        Company and the  Company's manufacturing  of lasers  for sale  to
        ThermoLase Corporation.  Certain officers of the Company are also
        officers of ThermoTrex, Thermo Electron and/or other subsidiaries
        of Thermo Electron, and are full-time employees of ThermoTrex  or
        Thermo Electron.  Such officers  will devote  only a  portion  of
        their working time to the  affairs of the Company. For  financial
        reporting purposes, the Company's financial results are  included
        in the consolidated financial statements of ThermoTrex and Thermo
        Electron. The members of  the Board of  Directors of the  Company
        who are also affiliated with  Thermo Electron or ThermoTrex  will
        consider not  only the  short-term and  the long-term  impact  of
        operating decisions on the Company,  but also the impact of  such
        decisions on the consolidated financial results of ThermoTrex and
        Thermo Electron. In some instances  the impact of such  decisions
        could be  disadvantageous to  the Company  while advantageous  to
        ThermoTrex or Thermo Electron,  or vice versa.  The Company is  a
        party to various agreements with  Thermo Electron that may  limit
        the Company's operating flexibility.

          Significant Additional Shares Eligible for Future Sale.  The
          ------------------------------------------------------ 
        22,882,420 shares  of  Common Stock  owned  by ThermoTrex  as  of
        January 3,  1998  are eligible  for  resale under  Rule  144.  In
        addition, as long as  ThermoTrex is able to  elect a majority  of
        the Company's Board  of Directors,  it will have  the ability  to
        cause the Company  at any time  to register for  resale all or  a
        portion of the Common Stock owned by ThermoTrex. 

                                       11
PAGE
<PAGE>






        Additional shares  of  Common  Stock issuable  upon  exercise  of
        options granted  under  the  Company's  stock-based  compensation
        plans will become available for future sale in the public  market
        at prescribed times. Sales of  a significant number of shares  of
        Common Stock  in the  public market  could adversely  affect  the
        market price of the Common Stock. 

          Potential Volatility of Stock Price.   Since public trading of
          -----------------------------------
        the Company's Common  Stock commenced  in June  1996, the  market
        price  has  fluctuated  considerably,  and  it  may  continue  to
        fluctuate in  the future.  Factors such  as fluctuations  in  the
        Company's  operating  results,  announcements  of   technological
        innovations or new contracts  or products by  the Company or  its
        competitors, government regulation and approvals, developments in
        patent or  other proprietary  rights  and market  conditions  for
        stocks  of  companies  similar  to  the  Company  could  have   a
        significant impact on the market price of the Common Stock. 

          Lack of  Dividends.  The  Company anticipates  that for
          ------------------
        foreseeable future  the  Company's  earnings,  if  any,  will  be
        retained for use in the business and that no cash dividends  will
        be paid  on the  Common Stock.  Declaration of  dividends on  the
        Common  Stock  will  depend  upon,  among  other  things,  future
        earnings, the operating and  financial condition of the  Company,
        its capital requirements and general business conditions. 


                              SELLING SHAREHOLDERS

           The following table shows the names of the Selling
        Shareholders, the number of Shares that may be offered by each of
        them pursuant to this Prospectus and the number of Shares each
        will own after completion of the offering, assuming all of the
        Shares being offered hereby are sold.

                                     Shares of
                                      Common                Shares
                                    Stock Owned  Shares      Owned
              Selling Shareholder    Prior to     Being      after
              -------------------
                                        the      Offered  Completion
                                                 -------
                                    Offering(1)             of the
                                    ----------
                                                           Offering
                                                           --------
           Wessel Corporation N.V.    100,000    100,000           0


           Thermo Opportunity         50,000     50,000            0
           Fund, Inc.
           Primespecial               20,000     20,000            0
           John D. Byran              20,000     20,000            0

           Union Bancaire Privee      18,000     18,000            0
           Robert E. Kirby            15,000     15,000            0


                                       12
PAGE
<PAGE>





           Yiska Moser Trust          15,000     15,000            0
           George & Elizabeth         10,000     10,000            0
           Harvey

           Myles Tanebaum             10,000     10,000            0
           Frank Argano               10,000     10,000            0
           Joseph N. Cunningham       10,000     10,000            0

           Howard Blitman             10,000     10,000            0
           Gestielle B                 5,000      5,000            0
           BCI Dollar Equity           5,000      5,000            0

           Gestielle America           2,000      2,000            0

        (1)Except as otherwise reflected in the footnotes to this table,
           all share ownership includes Shares owned by the Selling
           Shareholders and shares that the Selling Shareholders had the
           right to acquire within 60 days of September 28, 1996,
           through the exercise of stock options.

           The Shares are being registered to permit public secondary
        trading of the Shares from time to time by the Selling
        Shareholders.  All of the Shares being offered by the Selling
        Shareholders were sold by the Company in private placement
        transactions pursuant to Stock Purchase Agreements with the
        Company dated December 19, 1996  (collectively, the "Purchase
        Agreements").

           In the Purchase Agreements, the Company agreed, among other
        things, to bear all expenses (other than underwriting discounts,
        selling commissions, and fees and expenses of counsel and other
        advisors to the Selling Shareholders) in connection with the
        registration and sale of the Shares being offered by the Selling
        Shareholders. See "Sale of Shares."  The Company has agreed to
        prepare and file such amendments and supplements to the
        Registration Statement of which this Prospectus forms a part as
        may be necessary to keep the Registration Statement effective
        until all the Shares offered hereby have been sold pursuant
        thereto or until such Shares are no longer, by reason of Rule
        144(k) under the Securities Act or any other rule of similar
        effect, required to be registered for the public sale thereof by
        the Selling Shareholders.


                                 SALE OF SHARES

           The Company has been advised that the Selling Shareholders
        may sell Shares from time to time in transactions on the American
        Stock Exchange, in negotiated transactions, through the writing
        of options on the Shares, or a combination of such methods of
        sale, at fixed prices which may be changed, at market prices
        prevailing at the time of sale, at prices related to such
        prevailing market price or at negotiated prices.  The Selling


                                       13
PAGE
<PAGE>





        Shareholders may effect such transactions by selling the Shares
        to or through broker-dealers, and such broker-dealers may receive
        compensation in the form of discounts, concessions or commissions
        from the Selling Shareholders and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).

           The Selling Shareholders and any broker-dealers who act in
        connection with the sale of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act, and
        any commissions received by them and profit on any resale of the
        Shares as principal might be deemed to be underwriting discounts
        and commissions under the Securities Act.  The Company has agreed
        to indemnify the Selling Shareholders against certain
        liabilities, including liabilities under the Securities Act as
        underwriter or otherwise.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

             The following documents previously filed with the Commission
        by the Company (File No. 1-11827) are hereby incorporated in this
        Prospectus by reference:

             (a)  Annual Report on Form 10-K for the fiscal year ended
                  September 27, 1997;

             (b)  Quarterly Report on Form 10-Q for the fiscal quarter
                  ended January 3, 1998; and

             (c)  The description of the Common Stock which is contained
                  in the Company's Registration Statement on Form 8-A
                  filed under the Exchange Act, as such description may
                  be amended from time to time.

             All documents filed by the Company pursuant to Sections
        13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the
        date of this Prospectus and prior to the termination of the
        offering made hereby shall be deemed to be incorporated by
        reference into this Prospectus and to be a part hereof from the
        respective dates of filing of such documents.  Any statement
        contained herein or in a document all or any portion of which is
        incorporated or deemed to be incorporated by reference herein
        shall be deemed to be modified or superseded for purposes of this
        Prospectus to the extent that a statement contained herein or in
        any other subsequently filed document which also is or is deemed
        to be incorporated by reference herein modifies or supersedes
        such earlier statement.  Any statement so modified or superseded
        shall not be deemed, except as so modified or superseded, to
        constitute a part of this Prospectus.  

             Pursuant to Item 11(b) of Form S-3, the financial statements
        of Bennett X-Ray Corporation are incorporated by reference into
        this Prospectus from the Company's prospectus dated June 27, 1996

                                       14
PAGE
<PAGE>





        forming a part of the Company's Registration Statement on Form
        S-1 (Registration Number 333-2926).  

             The Company will provide without charge to any person to
        whom this Prospectus is delivered, upon the written or oral
        request of such person, a copy of any or all of the foregoing
        documents incorporated herein by reference (other than certain
        exhibits to such documents).  Requests for such copies should be
        directed to Sandra L. Lambert, Secretary, Trex Medical
        Corporation, c/o Thermo Electron Corporation, 81 Wyman Street,
        P.O. Box 9046, Waltham, Massachusetts 02254-9046 (telephone:
        (781) 622-1000).




                                  LEGAL MATTERS

           Certain legal matters relating to the Shares offered hereby
        have been passed upon for the Company by Seth H. Hoogasian, Esq.,
        General Counsel of Thermo Electron, ThermoTrex and the Company.
        As of the date of such opinion, Mr. Hoogasian owned or had the
        right to acquire 6,000 shares of Common Stock, 7,800 shares of
        common stock of ThermoTrex and 115,927 shares of common stock of
        Thermo Electron. 


                                    EXPERTS

          The financial statements of the Company incorporated by
        reference in this Prospectus, the financial statements of Bennett
        X-Ray Corporation incorporated by  reference in the  Registration
        Statement of which this Prospectus forms a part and the financial
        statement schedules incorporated by reference in the Registration
        Statement of which this Prospectus forms a part have been audited
        by Arthur Andersen  LLP, independent public  accountants, to  the
        extent and for  the periods  as indicated in  their reports  with
        respect thereto,  and are  incorporated  by reference   herein  in
        reliance upon the  authority of  said firm as  experts in  giving
        said reports. 















                                       15
PAGE
<PAGE>






                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

             Item 14.  Other Expenses of Issuance and Distribution.

           The expenses incurred by the Company in connection with the
        issuance and distribution of the securities being registered are
        as follows.  All amounts are estimated except the Securities and
        Exchange Commission registration fee.
                                                           Amount
                                                           ------
           Registration fee - Securities and Exchange      1,323.87
           Commission ...................................

           Legal fees and expenses ......................  10,000.0
                                                                  0
           Accounting fees and expenses .................  10,000.0
                                                                  0
           Miscellaneous ................................  8,676.13

                Total ...................................  30,000.0
                                                                  0

             Item 15.  Indemnification of Directors and Officers.

             The Delaware General Corporation Law and the Company's
        Certificate of Incorporation and By-Laws limit the monetary
        liability of directors to the Company and to its stockholders and
        provide for indemnification of the Company's officers and
        directors for liabilities and expenses that they may incur in
        such capacities. In general, officers and directors are
        indemnified with respect to actions taken in good faith in a
        manner reasonably believed to be in, or not opposed to, the best
        interests of the Company and, with respect to any criminal action
        or proceeding, actions that the indemnitee had no reasonable
        cause to believe were unlawful.  The Company also has
        indemnification agreements with its directors and officers that
        provide for the maximum indemnification allowed by law.  

             Thermo Electron Corporation has an insurance policy which
        insures the directors and officers of Thermo Electron and its
        subsidiaries, including the Company, against certain liabilities
        which might be incurred in connection with the performance of
        their duties.

             The Selling Shareholders are obligated under the Purchase
        Agreements to indemnify directors, officers and controlling
        persons of the Registrant against certain liabilities, including
        liabilities under the Securities Act.

             Item 16.  Exhibits



                                       16
PAGE
<PAGE>





             See the Exhibit Index included immediately preceding the
        exhibits to this Registration Statement.


             Item 17.  Undertakings.

             (a)  The undersigned Registrant hereby undertakes as
        follows:

                   (1) To file, during any period in which offers or
                       sales are being made, a post-effective amendment
                       to this registration statement:

                       (i)  To include any prospectus required by Section
                            10(a)(3) of the Securities Act of 1933;

                       (ii) To reflect in the prospectus any facts or
                            events arising after the effective date of
                            the registration statement (or the most
                            recent post-effective amendment thereof)
                            which, individually or in the aggregate,
                            represent a fundamental change in the
                            information set forth in the registration
                            statement.  Notwithstanding the foregoing,
                            any increase or decrease in volume of
                            securities offered (if the total dollar value
                            of securities offered would not exceed that
                            which was registered) and any deviation from
                            the low or high end of the estimated maximum
                            offering range may be reflected in the form
                            of prospectus filed with the Commission
                            pursuant to Rule 424(b) if, in the aggregate,
                            the changes in volume and price represent no
                            more than 20 percent change in the maximum
                            aggregate offering price set forth in the
                            "Calculation of Registration Fee" table in
                            the effective registration statement;

                       (iii)To include any material information with
                            respect to the plan of distribution not
                            previously disclosed in the registration
                            statement or any material change to such
                            information in the registration statement.

                            Provided, however, that paragraphs (a)(1)(i)
                       and (a)(1)(ii) do not apply if the information
                       required to be included in a post-effective
                       amendment by those paragraphs is contained in
                       periodic reports filed with or furnished to the
                       Commission by the Registrant pursuant to Section
                       13 or Section 15(d) of the Securities Exchange Act
                       of 1934 that are incorporated by reference in the
                       registration statement.


                                       17
PAGE
<PAGE>





                  (2)  That, for the purpose of determining any liability
                       under the Securities Act of 1933, each such
                       post-effective amendment shall be deemed to be a
                       new registration statement relating to the
                       securities offered therein, and the offering of
                       such securities at that time shall be deemed to be
                       the initial bona fide offering thereof.

                  (3)  To remove from registration by means of a
                       post-effective amendment any of the securities
                       being registered which remain unsold at the
                       termination of the offering.

             (b)  The undersigned Registrant hereby undertakes that, for
        purposes of determining any liability under the Securities Act of
        1933, each filing of the Registrant's annual report pursuant to
        Section 13(a) or Section 15(d) of the Securities Exchange Act of
        1934 (and, where applicable, each filing of an employee benefit
        plan's annual report pursuant to Section 15(d) of the Securities
        Exchange Act of 1934) that is incorporated by reference in this
        registration statement shall be deemed to be a new registration
        statement relating to the securities offered therein, and the
        offering of such securities at that time shall be deemed to be
        the initial bona fide offering thereof.

             (c)  Insofar as indemnification for liabilities arising
        under the Securities Act of 1933 may be permitted to directors,
        officers and controlling persons of the Registrant pursuant to
        the foregoing provisions, or otherwise, the Registrant has been
        advised that in the opinion of the Securities and Exchange
        Commission such indemnification is against public policy as
        expressed in the Act and is, therefore, unenforceable.  In the
        event that a claim for indemnification against such liabilities
        (other than the payment by the Registrant of expenses incurred or
        paid by a director, officer or controlling person of the
        Registrant in the successful defense of any action, suit or
        proceeding) is asserted by such director, officer or controlling
        person in connection with the securities being registered, the
        Registrant will, unless in the opinion of its counsel the matter
        has been settled by controlling precedent, submit to a court of
        appropriate jurisdiction the question whether such
        indemnification by it is against public policy as expressed in
        the Act and will be governed by the final adjudication of such
        issue.











                                       18
PAGE
<PAGE>




                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant has duly caused this Post-Effective Amendment No.
        1 on Form S-3 to Registration Statement on Form S-1 to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 25th
        day of March, 1998.

                                           TREX MEDICAL CORPORATION

                                           By:  /s/ Hal Kirshner
                                              -------------------
                                                Hal Kirshner
                                                President and Chief
                                                Executive Officer

             Pursuant to the requirements of the Securities Act of 1933,
        this Post-Effective Amendment No. 1 on Form S-3 to Registration
        Statement on Form S-1 has been signed by the following persons in
        the capacities and on the dates indicated.

          Signature                        Title             Da
          ---------                        -----             ----
                                                             Date
                                                             ----

        /s/ Hal Kirshner            President, Chief   March 25, 1998
        -------------------------
        Hal Kirshner                Executive Officer 
                                    and Director (Principal
                                    Executive Officer)

        John N. Hatsopoulos*        Chief Financial    March 25, 1998
        -------------------------
        John N. Hatsopoulos         Officer and Senior Vice President
                                    (Principal Financial Officer)

        Paul F. Kelleher*           Chief Accounting   March 25, 1998
        -------------------------
        Paul F. Kelleher            Officer (Principal 
                                    Accounting Officer)

        Gary S. Weinstein*          Chairman of the    March 25, 1998
        -------------------------
        Gary S. Weinstein           Board and Director

        Dr. Elias P. Gyftopoulos*   Director           March 25, 1998
        -------------------------
        Dr. Elias P. Gyftopoulos

        John T. Keiser              Director           March   , 1998
        -------------------------                            --
        John T. Keiser

        Dr. James W. May, Jr.*      Director           March 25, 1998
        -------------------------
        Dr. James W. May, Jr.

        Hutham S. Olayan*           Director           March 25, 1998
        -------------------------
        Hutham S. Olayan

        Firooz Rufeh*               Director           March 25, 1998
        -------------------------
        Firooz Rufeh





                                       19
PAGE
<PAGE>





        *    The undersigned Sandra L. Lambert, by signing her name
        hereto, does hereby execute this Post-Effective Amendment No. 1
        on Form S-3 to Registration Statement on Form S-1 on behalf of
        each of the above-named persons pursuant to powers of attorney
        executed by such persons and filed with the Securities and
        Exchange Commission.

                                           /s/ Sandra L. Lambert
                                           --------------------------
                                           Sandra L. Lambert
                                           Attorney-in-Fact













































                                       20
PAGE
<PAGE>






                                  EXHIBIT INDEX


         Exhibit                  Description of Exhibit
         -------                  ----------------------
           No.
           ---
             4.1  Specimen Common Stock Certificate (filed as Exhibit
                  4.1 to the Registrant's Registration Statement on
                  Form S-1 [Registration No. 333-2926]  and
                  incorporated herein by  reference).

             4.2  $42,000,000  4.2% Convertible Subordinated Note due
                  2000 issued by the Registrant to ThermoTrex
                  Corporations(filedtastExhibitt4.2ntootheorm S-1
                  [Registration No. 333-2926] and incorporated herein
                  by reference).

              5   Opinion of Seth H. Hoogasian, Esq. (previously
                  filed)
            23.1  Consent of Arthur Andersen LLP
            23.2  Consent of Arthur Andersen LLP

            23.3  Consent of Seth H. Hoogasian, Esq. (contained in
                  Exhibit 5)
             24   Power of Attorney (previously filed)





        AA980390005
























                                       21
PAGE
<PAGE>





                                                             Exhibit 23.1



                    Consent of Independent Public Accountants
                    -----------------------------------------


        To Trex Medical Corporation:

            As independent public accountants, we hereby consent to the
        incorporation by reference of our reports dated November 3, 1997,
        incorporated by reference in this registration statement and to
        all references to our firm included in or made a part of this
        registration statement on Form S-3.


                                                    Arthur Andersen LLP


        Boston, Massachusetts
        March 24, 1998


































                                       22
PAGE
<PAGE>






                                                             Exhibit 23.2



                    Consent of Independent Public Accountants
                    -----------------------------------------


        To Bennett X-Ray Corporation:

            As independent public accountants, we hereby consent to the
        incorporation by reference in this registration statement of our
        report dated November 3, 1995, included in Trex Medical
        Corporation's registration statement on Form S-1, and to all
        references to our firm included in or made a part of this
        registration statement on Form S-3.


                                                    Arthur Andersen LLP


        Boston, Massachusetts
        March 24, 1998



































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