HBO & CO
S-3/A, 1996-11-14
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 14, 1996
    
   
                                                      REGISTRATION NO. 333-15093
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                         ------------------------------
   
                                   AMENDMENT
                                     NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
                         ------------------------------
                                 HBO & COMPANY
             (Exact Name of Registrant as Specified in Its Charter)
 
<TABLE>
<S>                             <C>
           DELAWARE                   37-0986839
 (State or Other Jurisdiction
              of                   (I.R.S. Employer
Incorporation or Organization)  Identification Number)
</TABLE>
 
                         ------------------------------
                           301 PERIMETER CENTER NORTH
                             ATLANTA, GEORGIA 30346
                                 (770) 393-6000
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
                         ------------------------------
                               CHARLES W. MCCALL
                                 PRESIDENT AND
                            CHIEF EXECUTIVE OFFICER
                                 HBO & COMPANY
                           301 PERIMETER CENTER NORTH
                             ATLANTA, GEORGIA 30346
                                 (770) 393-6000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                         ------------------------------
                                   COPIES TO:
 
<TABLE>
<S>                                   <C>
        LISA A. STATER, ESQ.                 RICHARD M. HULL, ESQ.
     Jones, Day, Reavis & Pogue             Gardere & Wynne, L.L.P.
     3500 One Peachtree Center                  1601 Elm Street
     303 Peachtree Street, N.E.                    Suite 3000
    Atlanta, Georgia 30308-3242               Dallas, Texas 75201
           (404) 521-3939                        (214) 999-3000
</TABLE>
 
                         ------------------------------
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
                         ------------------------------
 
    If the only securities being registered 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, please 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, 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 a prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE
 
   
    HBO & Company submitted a request for waiver to the Office of Chief
Accountant of the Securities and Exchange Commission (the "Commission") of
inclusion of certain financial information in the Registration Statement
pursuant to the rules adopted by the Commission in Release Nos. 33-7355 and
34-37802, which was granted on November 7, 1996. Accordingly, such financial
information has not been included herein.
    
 
                                       ii
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
                 SUBJECT TO COMPLETION DATED NOVEMBER 14, 1996
    
 
PROSPECTUS
 
                                 893,748 SHARES
                                 HBO & COMPANY
                                  COMMON STOCK
                               ------------------
 
    This Prospectus relates to 893,748 shares (the "Shares") of common stock,
par value $.05 per share (the "Common Stock"), of HBO & Company, a Delaware
corporation ("HBOC" or the "Company"), to be offered for the account of certain
stockholders of the Company (the "Selling Stockholders"). The Shares being
offered hereby were issued to the Selling Stockholders on September 19, 1996 in
connection with the acquisition by HBOC of all of the issued and outstanding
shares of capital stock of Management Software, Inc., a Missouri corporation
("MSI").
 
    The Common Stock is quoted on the Nasdaq Stock Market National Market
("Nasdaq NM") under the symbol "HBOC." The Company has been advised by the
Selling Stockholders that any or all of the Shares may be offered for sale and
sold by or on behalf of the Selling Stockholders from time to time in varying
amounts, including in block transactions, on the Nasdaq NM or the
over-the-counter market, in privately negotiated transactions, or otherwise, at
prices prevailing in such market or as may be negotiated at the time of the
sale. The Shares may be sold by the Selling Stockholders directly to one or more
purchasers, through agents designated from time to time or to or through
broker-dealers designated from time to time. In the event the Shares are
publicly offered through broker-dealers or agents, the Selling Stockholders may
enter into agreements with respect thereto. In order to comply with the
securities laws of certain states, sales of Shares offered hereby to the public
in such states may be made only through broker-dealers who are registered or
licensed in such states. To the extent required, the number of Shares to be
sold, the purchase price, the public offering price, if applicable, the name of
any such agent or broker-dealer, and any applicable commissions, discounts or
other items constituting compensation to such agents or broker-dealers with
respect to a particular offering will be set forth in a supplement or
supplements to this Prospectus (each, a "Prospectus Supplement"). As of the date
of this Prospectus, the Company is not aware of any selling arrangement between
any agent or broker-dealer and the Selling Stockholders. The aggregate proceeds
to the Selling Stockholders from the sale of the Shares so offered will be the
purchase price of the Shares sold, less the aggregate commissions, discounts and
other compensation, if any, paid by the Selling Stockholders to agents or
broker-dealers. See "Plan of Distribution." The Company will not receive any
proceeds directly from the sale of the Shares, but will bear certain expenses
thereof. See "Use of Proceeds" and "Plan of Distribution."
 
    The Selling Stockholders and any broker-dealers or agents that participate
with the Selling Stockholders in the distribution of any of the Shares may be
deemed to be "underwriters" within the meaning of the Securities Act of 1933, as
amended (the "Securities Act"), and any discount or commission received by
<PAGE>
them and any profits on the resale of the Shares purchased by them may be deemed
to be underwriting commissions or discounts under the Securities Act.
 
                            ------------------------
 
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.
 
                            ------------------------
 
   
               THE DATE OF THIS PROSPECTUS IS NOVEMBER 14, 1996.
    
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           -----
<S>                                                                        <C>
AVAILABLE INFORMATION AND SOURCES OF INFORMATION.........................     3
 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE........................     4
 
SUMMARY..................................................................     5
 
USE OF PROCEEDS..........................................................     7
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF HBOC...     7
 
SELLING STOCKHOLDERS.....................................................     9
 
PLAN OF DISTRIBUTION.....................................................     9
 
CERTAIN LEGAL MATTERS....................................................    10
 
EXPERTS..................................................................    10
</TABLE>
 
                                       2
<PAGE>
                AVAILABLE INFORMATION AND SOURCES OF INFORMATION
 
    HBOC 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"). The reports, proxy statements and other
information filed by HBOC with the Commission can be inspected and copied at the
public reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the Commission's Regional Offices
at 7 World Trade Center, 13th Floor, New York, New York 10048, and Citicorp
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of
such material also may be obtained by mail from the Public Reference Section of
the Commission, Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, at
prescribed rates. Additionally, the Commission maintains a Web site on the
Internet that contains reports, proxy and information statements and other
information regarding registrants that file electronically with the Commission
and that is located at http://www.sec.gov.
 
    HBOC has filed with the Commission a Registration Statement on Form S-3
(including the exhibits and amendments thereto, the "Registration Statement")
under the Securities Act with respect to the Common Stock offered hereby. This
Prospectus does not contain all the information set forth in the Registration
Statement, certain portions of which are omitted in accordance with the rules
and regulations of the Commission and to which reference is hereby made.
Statements contained in this Prospectus as to the contents of any contract,
agreement or other document referred to are not necessarily complete. With
respect to each such contract, agreement or other document filed as an exhibit
to the Registration Statement or otherwise filed with the Commission, reference
is made to the exhibit or other filing for a more complete description of the
matter involved, and each such statement shall be deemed qualified in its
entirety by such reference. Copies of the Registration Statement together with
exhibits may be inspected at the office of the Commission in Washington, D.C.,
as indicated above, without charge and copies thereof may be obtained therefrom
upon payment of a prescribed fee.
 
    All information contained in this Prospectus relating to the Selling
Stockholders and to the proposed or potential methods of distribution of Common
Stock being offered hereby has been supplied by the Selling Stockholders.
 
    NO PERSONS HAVE BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION, OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY HBOC. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A
SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES IN ANY JURISDICTION TO OR FROM
ANY PERSON TO WHOM IT IS NOT LAWFUL TO MAKE ANY SUCH OFFER OR SOLICITATION IN
SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY DISTRIBUTION
OF SECURITIES MADE HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE AN IMPLICATION
THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE
HEREOF OR THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO
THE DATE HEREOF.
 
                                       3
<PAGE>
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    The information in the following documents filed by HBOC with the Commission
(File No. 0-9900) pursuant to the Exchange Act is incorporated by reference in
this Prospectus:
 
    1.  Annual Report on Form 10-K for the fiscal year ended December 31, 1995
filed with the Commission on March 13, 1996;
 
   
    2.  Quarterly Reports on Form 10-Q for the quarter ended March 31, 1996
filed with the Commission on May 3, 1996, for the quarter ended June 30, 1996
filed with the Commission on July 31, 1996 and for the quarter ended September
30, 1996 filed with the Commission on November 12, 1996;
    
 
    3.  Current Reports on Form 8-K: (i) dated and filed with the Commission on
June 23, 1995, as amended by Form 8-K(A), dated and filed with the Commission on
July 31, 1995, as amended by Form 8-K(A)(2), dated and filed with the Commission
on August 8, 1995, and as amended by Form 8-K(A)(3), dated and filed with the
Commission on June 5, 1996; (ii) dated and filed with the Commission on February
27, 1996; (iii) dated and filed with the Commission on May 21, 1996; (iv) dated
and filed with the Commission on August 27, 1996; (v) dated and filed with the
Commission on September 11, 1996; (vi) dated and filed with the Commission on
September 23, 1996; and (vii) dated and filed with the Commission on September
27, 1996;
 
    4.  Proxy Statement, dated as of April 3, 1996, filed in definitive form on
April 3, 1996 with the Commission with respect to the information required to be
included herein by Items 401 (management), 402 (executive compensation) and 404
(certain relationships and related transactions) of Regulation S-K promulgated
under the Securities Act and the Exchange Act; and
 
    5.  The description of Common Stock and Preferred Share Purchase Rights
contained in HBOC's Registration Statements on Form 8-A, filed with the
Commission on August 19, 1981, as amended, and February 19, 1991, as amended,
respectively.
 
    All documents filed by HBOC pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering of the Shares made hereby, shall be deemed to be
incorporated by reference in this Prospectus and to be a part hereof from the
date of filing of such documents. Any statement contained herein or in a
document 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 was deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
    The information relating to HBOC contained in this Prospectus should be read
together with the information in the documents incorporated by reference.
 
    THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED HEREWITH. SUCH DOCUMENTS (OTHER THAN EXHIBITS TO SUCH
DOCUMENTS UNLESS SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE) ARE
AVAILABLE WITHOUT CHARGE TO ANY PERSON, INCLUDING ANY BENEFICIAL OWNER, TO WHOM
THIS PROSPECTUS IS DELIVERED, UPON WRITTEN OR ORAL REQUEST. REQUESTS FOR SUCH
DOCUMENTS SHOULD BE DIRECTED TO HBO & COMPANY, 301 PERIMETER CENTER NORTH,
ATLANTA, GEORGIA 30346, ATTENTION: ANNE DAVENPORT, TELEPHONE: (800) 426-2411.
 
                                       4
<PAGE>
                                    SUMMARY
 
    THE FOLLOWING SUMMARY SHOULD BE READ IN CONJUNCTION WITH, AND IS QUALIFIED
IN ITS ENTIRETY BY, THE MORE DETAILED INFORMATION AND CONSOLIDATED FINANCIAL
STATEMENTS, INCLUDING NOTES THERETO, AND PRO FORMA FINANCIAL INFORMATION
INCLUDED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS. ALL SHARE AND PER
SHARE DATA REGARDING THE COMMON STOCK IN THIS PROSPECTUS HAVE BEEN ADJUSTED TO
GIVE EFFECT TO A TWO-FOR-ONE STOCK SPLIT OF THE COMMON STOCK, EFFECTED IN THE
FORM OF A STOCK DIVIDEND PAID JUNE 10, 1996 TO STOCKHOLDERS OF RECORD ON MAY 27,
1996.
 
                                  THE COMPANY
 
GENERAL
 
    HBOC develops integrated patient care, clinical, financial and strategic
management software solutions for the healthcare industry. These open systems
applications facilitate the integration of clinical, financial and
administrative data from a wide range of customer systems and software. HBOC's
broad product portfolio can be implemented in a variety of combinations from
stand-alone to enterprisewide, enabling customers to add incremental
capabilities to existing information systems without making prior capital
investments obsolete. HBOC also provides a full complement of network
communications technologies, including wireless capabilities, as well as
outsourcing services that are offered under contract management agreements
whereby its staff manages and operates data centers, information systems,
organizations and business offices of healthcare institutions of various sizes
and structures.
 
    HBOC markets its products and services to integrated health delivery
networks, hospitals, physicians' offices, home health providers, pharmacies,
reference laboratories, managed care providers and payers. At December 31, 1995,
HBOC had 2,700 customers of which 2,200 were United States community hospitals.
There were a total of 5,300 community hospitals in the United States at December
31, 1995. HBOC also sells its products and services internationally through
subsidiaries and/or distribution agreements in the United Kingdom, Canada,
Ireland, Saudi Arabia, Australia, Puerto Rico and New Zealand.
 
    The address and telephone number of the principal executive offices of HBOC
are 301 Perimeter Center North, Atlanta, Georgia 30346, (770) 393-6000.
 
RECENT DEVELOPMENTS
 
    CYCARE TRANSACTION.  On August 21, 1996, the Company acquired all of the
outstanding capital stock of CyCare Systems, Inc. ("CyCare") in exchange for
approximately 4,400,000 shares of HBOC Common Stock. CyCare was a leading
provider of physician practice management software systems and electronic data
interchange services to the healthcare industry, including physicians, medical
group practices, faculty practice plans and medical enterprises.
 
    MSI TRANSACTION.  On September 19, 1996, the Company acquired all of the
issued and outstanding shares of capital stock of MSI from the Selling
Stockholders in exchange for the 893,748 Shares and cash in lieu of two
additional shares. MSI was a Missouri based provider of software solutions for
the homecare industry with approximately 600 customers. The Company has filed
the Registration Statement of which this Prospectus is a part in satisfaction of
its obligations to register such Shares for resale by the Selling Stockholders.
 
   
    CONCURRENT OFFERING.  On September 23, 1996, the Company, HBO & Company of
Georgia, a wholly owned subsidiary of the Company ("HBOC-GA"), and GMIS Inc.
("GMIS") entered into an Agreement of Merger (the "Merger Agreement") pursuant
to which GMIS is to be merged (the "Merger") with and into HBOC-GA and each
outstanding share of the common stock of GMIS is to be converted into .42 of a
share of Common Stock of HBOC, subject to certain adjustments. GMIS, a
Pennsylvania based company, is a developer of data quality and decision support
software for the payer marketplace. On November 6, 1996, the Commission declared
effective a registration statement filed by the Company registering 4,932,624
shares of Common Stock, the maximum number of shares to be issued in connection
with the GMIS transaction, assuming approval of the transaction by stockholders
of GMIS at a special meeting to be held December 9, 1996. The availability for
sale of a substantial number of shares of HBOC Common Stock as a result of such
offering or otherwise could have a significant adverse effect on the market
price for the HBOC Common Stock.
    
 
                                       5
<PAGE>
                             SUMMARY FINANCIAL DATA
 
    The following summary historical financial data for HBOC should be read in
conjunction with the financial statements and notes thereto of HBOC,
incorporated by reference in this Prospectus.
 
                               HBO & COMPANY (1)
                          (FROM CONTINUING OPERATIONS)
                    (000 OMITTED EXCEPT FOR PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                     AT AND FOR THE NINE
                                                                                                    MONTHS ENDED SEPTEMBER
                                                  AT AND FOR THE YEAR ENDED DECEMBER 31,                     30,
                                        ----------------------------------------------------------  ----------------------
                                         1991(2)       1992        1993        1994      1995(3)     1995(4)     1996(5)
                                        ----------  ----------  ----------  ----------  ----------  ----------  ----------
<S>                                     <C>         <C>         <C>         <C>         <C>         <C>         <C>
Income Statement Data:
  Revenue.............................  $  263,591  $  309,065  $  342,627  $  421,740  $  571,461  $  404,376  $  544,986
  Operating Income....................  $    9,313  $   26,256  $   24,973  $   60,959  $  101,544  $   73,456  $  120,721
  Income Before Income Taxes..........  $    7,481  $   25,738  $   28,396  $   61,426  $  101,466  $   73,191  $  122,959
  Net Income..........................  $    5,563  $   17,354  $   14,141  $   38,370  $   62,462  $   45,015  $   74,320
  Primary Earnings Per Share..........  $      .08  $      .23  $      .18  $      .49  $      .74  $      .54  $      .83
  Fully Diluted Earnings Per Share....  $      .08  $      .23  $      .18  $      .49  $      .74  $      .54  $      .83
  Weighted Average Shares Outstanding
    (Fully Diluted)...................      69,846      75,634      77,825      78,583      84,380      83,365      89,608
  Cash Dividends Per Share............  $     .075  $     .075  $     .075  $      .08  $      .08  $      .06  $      .06
Balance Sheet Data:
  Working Capital.....................  $   27,493  $   34,576  $   54,996  $   26,977  $   66,959  $   33,266  $  145,199
  Total Assets........................  $  182,848  $  191,564  $  211,690  $  317,004  $  589,886  $  541,430  $  677,339
  Long-Term Debt......................  $   29,127  $    7,200  $    6,133  $    4,715  $    3,642  $    4,123  $      213
  Stockholders' Equity................  $   64,972  $  102,578  $  116,371  $  156,452  $  356,865  $  327,988  $  440,556
</TABLE>
    
 
- ------------------------
 
   
(1) All share and per share amounts have been restated to reflect the 1996
    two-for-one stock split effected in the form of a stock dividend. All
    periods have been restated for the 1996 acquisitions of CyCare and MSI in
    pooling transactions.
    
 
   
(2) 1991 Income Statement related items exclude the nonrecurring charge of
    $10,883 and include the dilutive effect of stock options. The net loss was
    ($2,620) and fully diluted loss per share was ($.04) including the
    nonrecurring charge.
    
 
   
(3) 1995 Income Statement related items exclude the nonrecurring charge of
    $136,481 and include the dilutive effect of stock options. The net loss was
    ($19,427) and fully diluted loss per share was ($.24) including the
    nonrecurring charge.
    
 
   
(4) September 1995 Income Statement related items exclude the nonrecurring
    charge of $136,481 and include the dilutive effect of stock options. The net
    loss was ($36,874) and fully diluted loss per share was ($.46) including the
    nonrecurring charge.
    
 
   
(5) September 1996 Income Statement related items exclude the nonrecurring
    charge of $26,214. Net income was $58,591 and fully diluted earnings per
    share was $.65 including the nonrecurring charge.
    
 
                                       6
<PAGE>
                                USE OF PROCEEDS
 
    The Company will not receive any proceeds directly from the sale of any of
the Shares offered hereby. A portion of the proceeds, at the option of the
Selling Stockholders, may be used to replace any of the 89,373 Shares which are
currently held in escrow pursuant to the terms of the Stock Purchase Agreement,
dated September 10, 1996, by and among HBOC, MSI and the Selling Stockholders
(the "Stock Purchase Agreement"). Under the terms of the Stock Purchase
Agreement, if HBOC is entitled to indemnification thereunder, it shall first
collect the amount of such indemnification from the funds in escrow. See
"Selling Stockholders."
 
     SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF HBOC
 
   
    The following table sets forth, as of October 31, 1996, unless otherwise
indicated, certain information with respect to all stockholders known to HBOC to
beneficially own more than five percent of the HBOC Common Stock, and
information with respect to HBOC Common Stock beneficially owned by each
director of HBOC, the Chief Executive Officer of HBOC, HBOC's other executive
officers who were the most highly compensated for the year ended December 31,
1995 and who continued to be employed by HBOC on September 30, 1996 and all
directors and executive officers of HBOC as a group. Except as otherwise
indicated, the stockholders listed in the table have sole voting and investment
powers with respect to HBOC Common Stock owned by them.
    
 
   
<TABLE>
<CAPTION>
                                                                            AMOUNT AND NATURE OF
NAME AND ADDRESS OF BENEFICIAL OWNER                                        BENEFICIAL OWNERSHIP    PERCENT OF CLASS
- -------------------------------------------------------------------------  ----------------------  -------------------
<S>                                                                        <C>                     <C>
American Express Financial Corporation...................................        5,035,614(1)                5.8%
  IDS Tower 10
  Minneapolis, Minnesota 55440
FMR Corp.................................................................        5,166,500(2)                6.0%
  82 Devonshire Street
  Boston, Massachusetts 02109
Putnam Investments, Inc..................................................        5,196,136(3)                6.0%
  One Post Office Square
  Boston, Massachusetts 02109
Alfred C. Eckert III.....................................................           30,000(4)               *
Holcombe T. Green, Jr....................................................        1,238,860(5)                1.4%
Philip A. Incarnati......................................................           35,000(4)               *
Alton F. Irby III........................................................           30,000(4)               *
Gerald E. Mayo...........................................................           82,000(4)               *
Charles W. McCall........................................................        1,476,120(6)                1.7%
James V. Napier..........................................................           67,088(7)               *
Charles E. Thoele........................................................           22,000(8)               *
Donald C. Wegmiller......................................................           15,000(4)               *
Jay P. Gilbertson........................................................           25,098(9)               *
Albert J. Bergonzi.......................................................           50,372(10)              *
Russell G. Overton.......................................................           10,264                  *
All Directors and Executive Officers as a Group (12 persons).............        3,081,802                   3.6%
</TABLE>
    
 
- --------------------------
 *  Less than 1%
 
 (1) According to the joint Schedule 13G as of December 31, 1995, of American
    Express Company ("AEC") and American Express Financial Corporation ("AEFC"),
    each of AEC and AEFC has shared voting
 
                                       7
<PAGE>
    power with respect to 2,123,814 shares and has shared dispositive power with
    respect to 5,035,614 shares. Neither has sole voting nor sole dispositive
    power with respect to such shares. AEC, the parent holding company of AEFC,
    disclaims beneficial ownership of all such shares.
 
 (2) According to the Schedule 13G as of December 31, 1995, of FMR Corp.
    ("FMR"), FMR has sole dispositive power with respect to all of such shares
    and sole voting power with respect to 499,700 shares.
 
 (3) According to the joint Schedule 13G as of December 31, 1995, of Putnam
    Investments, Inc. ("PI"), its parent, Marsh & McLennan Companies, Inc. and
    PI's subsidiaries, Putnam Investment Management, Inc. ("PIM") and The Putnam
    Advisory Company, Inc. ("PAC"), PAC has shared voting and shared dispositive
    power with respect to 4,419,136 of such shares and PI has shared voting and
    shared dispositive power with respect to 535,300 and 5,196,136 of such
    shares.
 
 (4) Represents shares that may be acquired through the exercise of presently
    exercisable stock options.
 
 (5) Includes 440,000 shares that Mr. Green may acquire through the exercise of
    presently exercisable stock options; 11,460 shares held in an IRA for the
    benefit of Mr. Green; 663,300 shares held by a limited partnership of which
    Mr. Green's wife is a general partner and with respect to which beneficial
    ownership is disclaimed, except to the extent of his pecuniary interest
    therein; and 124,100 shares held by HTG Corp. which is wholly owned by Mr.
    Green.
 
 (6) Includes 845,322 shares that may be acquired through the exercise of
    presently exercisable stock options.
 
 (7) Includes 600 shares owned by Mr. Napier's daughter and 40,000 shares that
    may be acquired through the exercise of presently exercisable stock options.
 
 (8) Includes 20,000 shares that may be acquired through the exercise of
    presently exercisable stock options.
 
 (9) Includes 16,000 shares that may be acquired through the exercise of
    presently exercisable stock options.
 
(10) Includes 48,400 shares that may be acquired through the exercise of
    presently exercisable stock options.
 
                                       8
<PAGE>
                              SELLING STOCKHOLDERS
 
    All of the 893,748 Shares offered hereby are being sold by the Selling
Stockholders. Such Shares were issued to the Selling Stockholders on September
19, 1996 in connection with the sale of all of the outstanding capital stock of
MSI to the Company. The Company has filed the Registration Statement in
satisfaction of its obligations to register the Shares for resale by the Selling
Stockholders. HBOC has agreed to indemnify the Selling Stockholders against
certain liabilities, including liabilities under the Securities Act. HBOC is
entitled to indemnification from the Selling Stockholders in the event of a
breach of certain representations, warranties and covenants set forth in the
Stock Purchase Agreement, and an aggregate of 89,373 Shares are presently held
in escrow pursuant to the Stock Purchase Agreement, which Shares may be used to
satisfy any indemnification obligations of the Selling Stockholders. The Selling
Stockholders may elect to sell such escrowed Shares and substitute the proceeds
of such sale in the escrow.
 
    The following table sets forth certain information as of the date of this
Prospectus regarding the beneficial ownership of Common Stock by the Selling
Stockholders:
 
<TABLE>
<CAPTION>
                                    BENEFICIAL OWNERSHIP PRIOR TO
                                            THE OFFERING                                        BENEFICIAL OWNERSHIP AFTER
                                -------------------------------------                                THE OFFERING(1)
                                   NUMBER OF                                           --------------------------------------------
                                   SHARES OF         PERCENTAGE OF                       NUMBER OF SHARES OF       PERCENTAGE OF
NAME                              COMMON STOCK      COMMON STOCK(2)    SHARES OFFERED       COMMON STOCK          COMMON STOCK(2)
- ------------------------------  ----------------  -------------------  --------------  -----------------------  -------------------
<S>                             <C>               <C>                  <C>             <C>                      <C>
Jim Atteberry.................      288,979                *                288,979                   0                 --
Wayne W. Clements.............      288,979(3)             *                288,979                   0                 --
Russell L. Still..............      288,979(4)             *                288,979                   0                 --
Stanley Bell..................        8,937                *                  8,937                   0                 --
Dan Cobb......................        8,937                *                  8,937                   0                 --
Charles Daniels...............        8,937                *                  8,937                   0                 --
                                                                                                      -
                                    -------                 ---             -------                                       ---
      Total...................      893,748                 1.0%            893,748                   0                 --
                                                                                                      -
                                                                                                      -
                                    -------                 ---             -------                                       ---
                                    -------                 ---             -------                                       ---
</TABLE>
 
- ------------------------
 
 * Less than 1%.
 
(1) Assuming that each Selling Stockholder sells all of the Shares owned by such
    person in this offering.
 
(2) Represents the number of Shares beneficially owned by each Selling
    Stockholder, expressed as a percentage of all shares of Common Stock
    actually outstanding as of September 30, 1996.
 
(3) Represents Shares held as tenants in common with Susan Clements.
 
(4) Represents Shares held as tenants in common with Sara S. Still.
 
    Each of the Selling Stockholders is employed by HBOC-GA, a wholly owned
subsidiary of HBOC, and is subject to a Confidentiality and Noncompetition
Agreement in favor of HBOC-GA. Prior to the acquisition of MSI by HBOC, the
Selling Stockholders were stockholders, and Messrs. Atteberry, Clements and
Still were executive officers, of MSI.
 
    In connection with the sale of the Shares to the Selling Stockholders, HBOC,
MSI and Messrs. Atteberry, Still and Clements entered into an agreement dated
September 10, 1996, pursuant to which HBOC agreed to grant to each of Messrs.
Atteberry, Still and Clements incentive stock options to purchase 15,000 shares
and to grant to each of Messrs. Bell, Cobb and Daniels incentive stock options
to purchase 6,000 shares. Each option will vest over a period of five (5) years
at twenty percent (20%) per year and is conditioned upon the option holder's
compliance with the terms of the Confidentiality and Noncompetition Agreement.
 
                              PLAN OF DISTRIBUTION
 
    Any or all of the Shares offered by the Selling Stockholders hereby may be
offered for sale and sold by or on behalf of the Selling Stockholders from time
to time in varying amounts, including in block
 
                                       9
<PAGE>
transactions, on the Nasdaq NM or the over-the-counter market, in privately
negotiated transactions, or otherwise, at prices prevailing in such market or as
may be negotiated at the time of the sale. The Shares may be sold by the Selling
Stockholders directly to one or more purchasers, through agents designated from
time to time or to or through broker-dealers designated from time to time. In
the event the Shares are publicly offered through broker-dealers or agents, the
Selling Stockholders may enter into agreements with respect thereto. Such
broker-dealers or agents may receive compensation in the form of discounts,
concessions or commissions from the Selling Stockholders and/or the purchasers
of the Shares. The Selling Stockholders and any such broker-dealers or agents
that participate in the distribution of the Shares may be deemed to be
underwriters within the meaning of the Securities Act, and any profit on the
sale of the Shares by them and any discounts, commissions or concessions
received by them may be deemed to be underwriting discounts and commissions
under the Securities Act. Any such broker-dealers and agents may engage in
transactions with, and perform services for, the Company. At the time a
particular offer of Shares is made by the Selling Stockholders, to the extent
required, a Prospectus Supplement will be distributed which will set forth the
aggregate number of Shares being offered, and the terms of the offering,
including the public offering price thereof, the name or names of any
broker-dealers or agents, any discounts, commissions and other items
constituting compensation from, and the resulting net proceeds to, the Selling
Stockholders.
 
    In order to comply with the securities laws of certain states, sales of
Shares offered hereby to the public in such states may be made only through
broker-dealers who are registered or licensed in such states. Sales of Shares
offered hereby must also be made by the Selling Stockholders in compliance with
other applicable state securities laws and regulations.
 
    The Company has been advised by the Selling Stockholders that they have not,
as of the date of this Prospectus, entered into any arrangement with an agent or
broker-dealer for the sale of the Shares owned by them being offered hereby.
 
                             CERTAIN LEGAL MATTERS
 
    The validity of the Shares of HBOC Common Stock offered hereby will be
passed upon for HBOC by Jones, Day, Reavis & Pogue, Atlanta, Georgia.
 
                                    EXPERTS
 
    The audited financial statements and schedule of HBOC incorporated by
reference in this Prospectus and elsewhere in the Registration Statement of
which this Prospectus is a part, to the extent and for the periods indicated in
their reports, have been audited by Arthur Andersen LLP, independent public
accountants, and are included herein in reliance upon the authority of said firm
as experts in giving said reports.
 
   
    With respect to the unaudited interim financial information of HBOC for the
quarters ended March 31, June 30, and September 30, 1995 and 1996, which are
incorporated by reference herein, Arthur Andersen LLP has applied limited
procedures in accordance with professional standards for a review of that
information. However, their separate report thereon states that they did not
audit and they do not express an opinion on that interim financial information.
Accordingly, the degree of reliance on their report on that information should
be restricted in light of the limited nature of the review procedure applied. In
addition, the accountants are not subject to the liability provisions of Section
11 of the Securities Act, for their report on the unaudited interim financial
information because that report is not a "report" or a "part" of the
Registration Statement prepared or certified by the accountants within the
meaning of Sections 7 and 11 of the Securities Act.
    
 
    The financial statements of the Health Services Business of First Data
Health Systems Corporation at December 31, 1993 and 1994, and for each of the
three years in the period ended December 31, 1994 incorporated herein and in the
Registration Statement of which this Prospectus is a part have been audited by
Ernst & Young LLP, independent auditors, as set forth in their reports thereon,
and are incorporated herein in reliance upon such reports given upon the
authority of such firm as experts in accounting and auditing.
 
                                       10
<PAGE>
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    Estimated expenses in connection with the issuance and distribution of the
securities to be registered, other than underwriting discounts and commissions,
are as follows:
 
<TABLE>
<CAPTION>
ITEM                                                                                  AMOUNT*
- -----------------------------------------------------------------------------------  ---------
 
<S>                                                                                  <C>
Registration fee...................................................................  $  15,302
Printing and engraving expenses....................................................     10,000
Legal fees and expenses............................................................     30,000
Accounting fees and expenses.......................................................      9,000
Miscellaneous expenses.............................................................      5,698
                                                                                     ---------
    Total..........................................................................  $  70,000
                                                                                     ---------
                                                                                     ---------
</TABLE>
 
- ------------------------
 
 *  All amounts estimated except the Registration fee.
 
All such expenses will be borne by the Company.
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    HBO & Company's (the "Company") By-Laws (Article IX, Section 1) provide that
every person who was or is a party or is threatened to be made a party to or is
involved in any action, suit or proceeding, whether civil, criminal,
administrative or investigative, by reason of the fact that he or a person of
whom he is the legal representative is or was a director or officer of the
corporation or is or was serving at the request of the corporation or for its
benefit as a director or officer of another corporation, or as its
representative in a partnership, joint venture, trust or other enterprise, shall
be indemnified and held harmless to the fullest extent legally permissible under
and pursuant to any procedure specified in the General Corporation Law of the
State of Delaware, as amended from time to time, against all expenses,
liabilities and losses (including attorneys' fees, judgments, fines and amounts
paid or to be paid in settlement) reasonably incurred or suffered by him in
connection therewith. Such right of indemnification shall be a contract right
that may be enforced in any manner by such person. Such right of indemnification
shall not be exclusive of any other right which such directors, officers or
representatives may have or thereafter acquire and, without limiting the
generality of such statement, they shall be entitled to their respective rights
of indemnification under any bylaw, agreement, vote of stockholders, provision
of law or otherwise, as well as their rights under such article.
 
    Article IX, Section 2 of the Company's By-Laws provides that the Board of
Directors may cause the corporation to purchase and maintain insurance on behalf
of any person who is or was a director or officer of the corporation, or is or
was serving at the request of the corporation as a director or officer of
another corporation, or as its representative in a partnership, joint venture,
trust or other enterprise against any liability asserted against such person and
incurred in any such capacity or arising out of such status, whether or not the
corporation would have the power to indemnify such person.
 
    With respect to indemnification of officers and directors, Section 145 of
the Delaware General Corporation Law provides that a corporation shall have the
power to indemnify any person who was or is a party or is threatened to be made
a party to any threatened, pending or completed action, suit or proceeding,
whether civil, criminal, administrative or investigative (other than an action
by or in the right of the corporation) by reason of the fact that he is or was a
director, officer, employee or agent of the corporation, or is or was serving at
the request of the corporation as a director, officer, employee or agent of
another corporation, partnership, joint venture, trust or other enterprise,
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably
 
                                      II-1
<PAGE>
believed to be in or not opposed to the best interests of the corporation, and,
with respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful. Under this provision of the Delaware General
Corporation Law, the termination of any action, suit or proceeding by judgment,
order, settlement, conviction or upon a plea of nolo contendere or its
equivalent, shall not, of itself, create a presumption that the person did not
act in good faith and in a manner which he reasonably believed to be in or not
opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had reasonable cause to believe that his conduct
was unlawful.
 
    Furthermore, the Delaware General Corporation Law provides that a
corporation shall have power to indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending, or completed action or
suit by or in the right of the corporation to procure a judgment in its favor by
reason of the fact that he is or was a director, officer, employee, or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee, or agent of another corporation, partnership, joint
venture, trust, or other enterprise, against expenses (including attorneys'
fees), actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability, but in view of all
circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper.
 
    In addition, the General Corporation Law of Delaware enables a Delaware
corporation to include in its certificate of incorporation a provision
eliminating or limiting a director's liability to the corporation or its
stockholders for monetary damages for breaches of a director's fiduciary duty as
a director. The statute provides, however, that liability for (a) breach of the
director's duty of loyalty, (b) acts or omissions not in good faith or involving
intentional misconduct or knowing violations of law, (c) the unlawful purchase
or redemption of stock or unlawful dividends or (d) transactions from which a
director derived an improper personal benefit cannot be eliminated or limited in
this manner. The Company's Certificate of Incorporation contains such
provisions.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
    (a) Exhibits. The following exhibits are filed as part of this Registration
Statement.
 
   
<TABLE>
<CAPTION>
EXHIBIT
NUMBER   DESCRIPTION
- -------  -----------------------------------------------------------------------
<S>      <C>
 4*      Registration Rights Agreement, dated September 19, 1996, by and among
           HBO & Company and the Shareholders (as defined therein).
 
 5       Opinion of Jones, Day, Reavis & Pogue re legality.
 
23(a)    Consent of Arthur Andersen LLP.
 
23(b)    Consent of Ernst & Young LLP.
 
23(c)    Consent of Jones, Day, Reavis & Pogue (included in Exhibit 5).
 
24*      Power of Attorney (included in signature page).
</TABLE>
    
 
- ------------------------
 
   
*Previously filed.
    
 
                                      II-2
<PAGE>
    The following exhibits filed with the Securities and Exchange Commission are
incorporated by reference as shown below.
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER    DESCRIPTION
- ------    ----------------------------------------------------------------------
<C>    <S>
          ON MAY 13, 1981, AS PART OF ITS REGISTRATION STATEMENT ON FORM S-1
            (REGISTRATION NUMBER 2-72275):
  4    a) -- Specimen forms of certificates for Common Stock of Registrant.
 
          ON FEBRUARY 15, 1991, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            2-75987):
  4    -- HBO & Company 1981 Incentive Stock Option Plan, as amended.
 
          ON FEBRUARY 22, 1991, AS PART OF ITS FORM 8-K:
  4    -- HBO & Company Rights Agreement.
 
          ON MARCH 26, 1991, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            2-92030):
  4    -- HBO & Company Nonqualified Stock Option Plan, as amended.
 
          ON MARCH 27, 1991, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-12051):
  4    -- HBO & Company 1986 Employee Nonqualified Stock Option Plan, as
            amended.
 
          ON AUGUST 12, 1993, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-67300):
  4    -- HBO & Company 1993 Stock Option Plan for Nonemployee Directors.
 
          ON JUNE 14, 1994, AS PART OF ITS FORM 8-K REPORT DATED JUNE 13, 1994,
            AS AMENDED BY FORM 8-KA DATED JUNE 30, 1994 AND FILED WITH THE
            COMMISSION ON JULY 1, 1994:
  2    -- Asset Purchase Agreement among IBAX Healthcare Systems, Baxter
            Healthcare Corporation, International Business Machines Corporation,
            Baxter Systems, Inc., HCPG Corporation, HBO & Company and HBO &
            Company of Georgia dated May 31, 1994.
 
          ON JULY 20, 1994, AS PART OF THE FORM S-4 REGISTRATION STATEMENT DATED
            JULY 19, 1994, AS AMENDED BY AMENDMENT NO. 1 TO FORM S-4 DATED
            AUGUST 10, 1994, AND FILED WITH THE COMMISSION ON AUGUST 11, 1994,
            AND FURTHER AMENDED BY AMENDMENT NO. 2 TO FORM S-4 DATED AUGUST 10,
            1994, AND FILED WITH THE COMMISSION AUGUST 11, 1994:
  2    -- Agreement of Merger dated June 30, 1994, by and among HBO & Company,
            HBO & Company of Georgia and Serving Software, Inc.
  3    -- Amended Bylaws.
 
          ON AUGUST 17, 1994, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-82962):
  4    -- HBO & Company 1990 Executive Incentive Plan, as amended.
 
          ON SEPTEMBER 15, 1994, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-84034):
  4    -- 1986 Incentive Stock Option Plan of Serving Software, Inc.
 
          ON MARCH 17, 1995, AS PART OF ITS FORM 10-K FOR THE YEAR ENDED
            DECEMBER 31, 1994:
  4    -- Chief Executive Officer Incentive Plan.
 
          ON MAY 9, 1995, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-59173):
  4    -- HBO & Company 1986 Nonqualified Stock Option Agreement, HBO & Company
            1991 Nonqualified Stock Option Agreement 1 and HBO & Company 1991
            Nonqualified Stock Option Agreement 2.
 
          ON JUNE 23, 1995, AS PART OF ITS FORM 8-K DATED JUNE 23, 1995, AS
            AMENDED BY FORM 8-KA DATED JULY 31, 1995, AND FILED WITH THE
            COMMISSION ON JULY 31, 1995, AS FURTHER AMENDED BY FORM 8-KA2 DATED
            AUGUST 8, 1995 AND FILED WITH THE COMMISSION ON AUGUST 8, 1995:
  2    -- Stock Purchase Agreement, dated as of May 16, 1995, among First Data
            Corporation, FDC Health, Inc., First Data Health Systems
            Corporation, HBO & Company, and HBO & Company of Georgia, as amended
            by letter agreement dated June 17, 1995.
 
          ON AUGUST 17, 1995, AS PART OF ITS FORM S-4 REGISTRATION STATEMENT
            DATED AUGUST 17, 1995, AS AMENDED BY AMENDMENT NO. 1 TO FORM S-4
            DATED SEPTEMBER 1, 1995, AND FILED WITH THE COMMISSION ON SEPTEMBER
            1, 1995:
</TABLE>
 
                                      II-3
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT
NUMBER    DESCRIPTION
- ------    ----------------------------------------------------------------------
<C>    <S>
  2    -- Agreement of Merger dated July 14, 1995, by and among HBO & Company,
            HBO & Company of Georgia and CliniCom Incorporated.
 
          ON OCTOBER 5, 1995, AS PART OF ITS FORM S-8 (REGISTRATION NUMBER
            33-63213):
  4    -- 1985 Employee Stock Option Plan of CliniCom Incorporated.
 
          ON MARCH 13, 1996, AS PART OF ITS FORM 10-K FOR THE YEAR ENDED
            DECEMBER 31, 1995:
  4    -- HBO & Company 1983 Employee Discount Stock Purchase Plan, as restated.
 
          ON MAY 21, 1996, AS PART OF ITS FORM 8-K DATED MAY 21, 1996, AND FILED
            WITH THE COMMISSION ON MAY 21, 1996:
  3    i) -- Amended and Restated Certificate of Incorporation of Registrant.
 
          ON OCTOBER 18, 1995, AS PART OF ITS FORM S-4 REGISTRATION STATEMENT AS
            FILED WITH THE COMMISSION ON OCTOBER 18, 1996:
  4    -- Agreement of Merger dated September 23, 1996, by and among HBO &
            Company, HBO & Company of Georgia and GMIS Inc.
</TABLE>
 
    (b) Financial Statement Schedules.
 
    No financial statement schedules are required to be filed herewith.
 
ITEM 17. UNDERTAKINGS.
 
    The undersigned Registrant hereby undertakes:
 
        (1) 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;
 
        (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.
 
    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 the
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.
 
    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.
 
                                      II-4
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this amendment to the
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Atlanta, in the State of Georgia, on the 13th
day of November, 1996.
    
 
                                          HBO & COMPANY
 
   
                                          By: _______/s/_CHARLES W. MCCALL______
                                                      Charles W. McCall
    
                                                PRESIDENT AND CHIEF EXECUTIVE
                                                         OFFICER
 
   
    Pursuant to the requirements of the Securities Act of 1933, this Amendment
to the Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated:
    
 
   
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                   DATE
- ------------------------------  --------------------------  -----------------
 
<S>                             <C>                         <C>
    /s/ CHARLES W. MCCALL       Director, President and
- ------------------------------    Chief Executive Officer   November 13, 1996
     (Charles W. McCall)          (Principal Executive
                                  Officer)
 
    /s/ JAY P. GILBERTSON       Senior Vice
- ------------------------------    President--Finance,       November 13, 1996
     (Jay P. Gilbertson)          Chief Financial Officer,
                                  Principal Accounting
                                  Officer, Treasurer and
                                  Assistant Secretary
                                  (Principal Financial
                                  Officer and Principal
                                  Accounting Officer)
 
              *
- ------------------------------  Chairman of the Board of
   (Holcombe T. Green, Jr.)       Directors
 
              *
- ------------------------------  Director
    (Alfred C. Eckert III)
 
              *
- ------------------------------  Director
    (Philip A. Incarnati)
 
              *
- ------------------------------  Director
     (Alton F. Irby III)
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                   DATE
- ------------------------------  --------------------------  -----------------
 
<S>                             <C>                         <C>
              *
- ------------------------------  Director
       (Gerald E. Mayo)
 
              *
- ------------------------------  Director
      (James V. Napier)
 
              *
- ------------------------------  Director
     (Charles E. Thoele)
 
              *
- ------------------------------  Director
    (Donald C. Wegmiller)
 
    /s/ CHARLES W. MCCALL
- ------------------------------
      *Charles W. McCall                                    November 13, 1996
       Attorney-in-Fact
 
    /s/ JAY P. GILBERTSON
- ------------------------------
      *Jay P. Gilbertson                                    November 13, 1996
       Attorney-in-Fact
</TABLE>
    
<PAGE>
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
EXHIBITS                                                                                                        PAGE
- ---------                                                                                                     ---------
 
<S>        <C>                                                                                                <C>
4*         Registration Rights Agreement, dated September 19, 1996, by and among HBO & Company and the
             Shareholders (as defined therein).
 
5          Opinion of Jones, Day, Reavis & Pogue re legality.
 
23(a)      Consent of Arthur Andersen LLP.
 
23(b)      Consent of Ernst & Young LLP.
 
23(c)      Consent of Jones, Day, Reavis & Pogue (included in Exhibit 5).
 
24*        Power of Attorney (included in signature page).
</TABLE>
    
 
- ------------------------
 
   
*Previously filed.
    

<PAGE>
                           JONES, DAY, REAVIS & POGUE
                           3500 ONE PEACHTREE CENTER
                              303 PEACHTREE STREET
                             ATLANTA, GEORGIA 30308
 
   
                                                               November 13, 1996
    
 
HBO & Company
301 Perimeter Center North
Atlanta, Georgia 30346
 
Gentlemen:
 
   
    We have acted as counsel to HBO & Company, a Delaware corporation (the
"Company"), in connection with the registration of 893,748 shares of Common
Stock, $.05 par value per share, of the Company (the "Shares"), pursuant to a
Registration Statement on Form S-3 (File No. 333-15093) (the "Registration
Statement"), filed with the Securities and Exchange Commission, to which this
opinion appears as Exhibit 5.
    
 
    We have examined originals or certified or photostatic copies of such
records of the Company, certificates of officers of the Company, and public
officials and such other documents as we have deemed relevant or necessary as
the basis of the opinion set forth below in this letter. In such examination, we
have assumed the genuineness of all signatures, the conformity to original
documents submitted as certified or photostatic copies, and the authenticity of
originals of such latter documents. Based on the foregoing, we are of the
following opinion:
 
        The Shares have been duly authorized and are validly issued, fully paid
    and nonassessable.
 
    We hereby consent to the filing of this opinion as Exhibit 5 to the
Registration Statement and the reference to this Firm under the heading "Certain
Legal Matters" in the Prospectus constituting part of the Registration
Statement.
 
                                          Sincerely,
                                          /s/ JONES, DAY, REAVIS & POGUE
                                          Jones, Day, Reavis & Pogue

<PAGE>
                                                                   EXHIBIT 23(A)
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our reports dated February 6, 1996
included or incorporated by reference in HBO & Company's Form 10-K for the year
ended December 31, 1995 and to all references to our firm included in this
registration statement.
 
                                          /s/ ARTHUR ANDERSEN LLP
                                          --------------------------------------
                                          ARTHUR ANDERSEN LLP
 
   
Atlanta, Georgia
November 12, 1996
    

<PAGE>
                                                                   EXHIBIT 23(B)
 
                        CONSENT OF INDEPENDENT AUDITORS
 
    We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of HBO & Company for
the registration of 893,748 shares of its common stock and to the incorporation
by reference therein of our reports dated January 26, 1995 (except for Note 12,
as to which the date is June 17, 1995) and March 31, 1995 (except for Note 11,
as to which the date is June 17, 1995), with respect to the financial statements
of the Health Services Business of First Data Health Systems Corporation
included in the Current Report on Form 8-K of HBO & Company dated July 31, 1995,
filed with the Securities and Exchange Commission.
 
                                          /s/ ERNST & YOUNG LLP
                                          --------------------------------------
                                          ERNST & YOUNG LLP
 
   
Denver, Colorado
November 12, 1996
    


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