TENET HEALTHCARE CORP
424B1, 1997-04-18
GENERAL MEDICAL & SURGICAL HOSPITALS, NEC
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<PAGE>
PROSPECTUS SUPPLEMENT
 
(TO PROSPECTUS DATED APRIL 17, 1997)
 
                                6,635,207 SHARES
 
                                     [LOGO]
 
                          TENET HEALTHCARE CORPORATION
 
                                  COMMON STOCK
                                 --------------
 
    This Prospectus Supplement relates to 6,635,207 shares (the "Shares") of par
value $0.075 Common Stock (the "Common Stock") of Tenet Healthcare Corporation
("Tenet," the "Registrant" or the "Company") to be offered in an underwritten
public offering by the persons listed under the heading "Selling Shareholders"
(the "Selling Shareholders"). The Shares originally were issued to Joseph
Littlejohn & Levy Fund, L.P. ("JLL") in connection with the acquisition of OrNda
HealthCorp by Tenet in January 1997 and were subsequently distributed to the
Selling Shareholders who are limited partners of JLL. See "Underwriting" and
"Selling Shareholders." The Company will not receive any of the proceeds from
the sale of the Shares made hereunder.
 
    The Common Stock is listed on the New York Stock Exchange and the Pacific
Stock Exchange under the symbol "THC." On April 17, 1997, the closing price of
the Common Stock on the New York Stock Exchange Composite Tape was $25.875.
                              -------------------
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 SUPPLEMENT OR THE PROSPECTUS TO WHICH IT RELATES.
      ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                                               PROCEEDS TO
                                                  PRICE TO             UNDERWRITING              SELLING
                                                   PUBLIC               DISCOUNT(1)          SHAREHOLDERS(2)
<S>                                         <C>                    <C>                    <C>
Per Share.................................         $25.75                  $.71                  $25.04
Total.....................................      $170,856,580            $4,710,997            $166,145,583
</TABLE>
 
(1) The Company and the Selling Shareholders have agreed to indemnify the
    several Underwriters against certain liabilities, including liabilities
    under the Securities Act of 1933, as amended. See "Underwriting."
(2) Estimated expenses of $200,000 will be paid by the Company.
                              -------------------
 
    The shares of Common Stock are offered by the several Underwriters, subject
to prior sale, when, as and if issued to and accepted by them, subject to
certain conditions. The Underwriters reserve the right to withdraw, cancel or
modify such offer and to reject orders in whole or in part. It is expected that
delivery of the shares of Common Stock will be made in New York, New York on or
about April 22, 1997.
                              -------------------
 
MERRILL LYNCH & CO.
                  DONALDSON, LUFKIN & JENRETTE
                        SECURITIES CORPORATION
                                        GOLDMAN, SACHS & CO.
                                                               J.P. MORGAN & CO.
                                  ------------
 
           The date of this Prospectus Supplement is April 17, 1997.
<PAGE>
    CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE SHARES OFFERED
HEREBY. SUCH TRANSACTIONS MAY INCLUDE STABILIZING, THE PURCHASE OF COMMON STOCK
TO COVER SYNDICATE SHORT POSITIONS AND THE IMPOSITIONS OF PENALTY BIDS. FOR A
DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                                  THE COMPANY
 
    Tenet is the second largest investor-owned healthcare services company in
the United States. At February 28, 1997, Tenet's subsidiaries owned or leased
and operated 127 general hospitals (with 27,366 licensed beds) and related
healthcare facilities serving urban and rural communities in 22 states. Tenet's
subsidiaries and affiliates also owned or leased and operated various ancillary
healthcare businesses, including outpatient surgery centers, home healthcare
programs, ambulatory, occupational and rural healthcare clinics, a health
maintenance organization, a preferred provider organization and a managed care
insurance company as well as a small number of rehabilitation hospitals,
specialty hospitals, long-term care facilities and psychiatric facilities. In
addition, Tenet's subsidiaries hold the following investments in other
healthcare companies: (i) an approximately 12.1% interest in Vencor, Inc., which
operates nursing homes and other healthcare businesses, (ii) an approximately
11.3% interest in Total Renal Care Holdings, Inc., which operates kidney
dialysis units and certain related healthcare businesses and (iii) an
approximately 23% interest in Health Care Property Partners.
 
    On January 30, 1997, Tenet completed its acquisition (the "Merger") of OrNda
HealthCorp ("OrNda"), which, with 49 general hospitals (9,599 licensed beds) at
November 30, 1996, was the third largest investor-owned healthcare services
company in the United States. Many of the hospitals acquired in the Merger are
located in geographic areas where Tenet was already operating hospitals,
including southern California and south Florida. The Merger also expanded
Tenet's operations into several new geographic areas, including Arizona, Iowa,
Massachusetts, Mississippi, Nevada, Oregon, Washington, West Virginia and
Wyoming. The Merger was accounted for on a pooling of interests basis. OrNda
(now known as Tenet HealthSystem HealthCorp) is now a wholly owned subsidiary of
Tenet.
 
    The Company's principal executive offices are located at 3820 State Street,
Santa Barbara, California 93105, and its telephone number is (805) 563-7000.
 
                                USE OF PROCEEDS
 
    All of the Shares offered hereby are being offered by the Selling
Shareholders. The Company will not receive any proceeds from the sale of the
Shares. See "Selling Shareholders."
 
                              SELLING SHAREHOLDERS
 
    The following table sets forth information with respect to the number of
Shares owned by each of the Selling Shareholders and the number of Shares that
may be offered hereby by each Selling Shareholder. The Company has agreed to pay
the fees and expenses of registration, including the fees and expenses (not to
exceed $50,000) for one counsel on behalf of the Selling Shareholders, in
connection with the sale of the
 
                                      S-2
<PAGE>
Shares offered hereby (other than underwriting discounts and commissions, which
will be paid by the Selling Shareholders).
 
<TABLE>
<CAPTION>
                                                                    NUMBER OF
                                                                  SHARES OWNED     NUMBER OF           NUMBER OF
                                                                    PRIOR TO        SHARES           SHARES OWNED
                              NAME                                  OFFERING     BEING OFFERED    AFTER THE OFFFERING
- ----------------------------------------------------------------  -------------  -------------  -----------------------
<S>                                                               <C>            <C>            <C>
California Public Employees' Retirement System (1)..............     1,830,892      1,830,892                  0
New York State Common Retirement Fund (2).......................       812,797        812,797                  0
Pension Reserves Investment Management Board....................       732,385        732,385                  0
The Rockefeller Foundation......................................       366,266        366,266                  0
State of Wisconsin Investment Board.............................       366,266        366,266                  0
Virginia Retirement System......................................       732,385        732,385                  0
Yale University.................................................       366,266        366,266                  0
Oregon Public Employees' Retirement System......................     1,098,505      1,098,505                  0
EES Distressed Securities Fund L.P..............................       183,059        183,059                  0
Montana Board of Investments....................................        18,261         18,261                  0
State Universities Retirement System............................        54,932         54,932                  0
Orange County Employees Retirement System.......................        73,193         73,193                  0
                                                                                                               -
                                                                  -------------  -------------
    Total.......................................................     6,635,207      6,635,207                  0
</TABLE>
 
- ------------------------
 
1.  Does not include approximately 4,080,012 shares of Common Stock owned as of
    the date hereof by California Public Employees' Retirement System in
    addition to the shares received in the distribution from JLL.
 
2.  Does not include approximately 2,731,000 shares of Common Stock owned as of
    the date hereof by the New York State Common Retirement Fund in addition to
    the shares received in the distribution from JLL.
 
                                      S-3
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions set forth in the purchase agreement (the
"Purchase Agreement") among the Company, the Selling Shareholders and Merrill
Lynch, Pierce, Fenner & Smith Incorporated, Donaldson, Lufkin & Jenrette
Securities Corporation ("DLJ"), Goldman, Sachs & Co. and J.P. Morgan Securities
Inc. ("JPMSI") (collectively, the "Underwriters"), the Selling Shareholders
severally have agreed to sell to each of the Underwriters, and each of the
Underwriters has agreed to purchase from the Selling Shareholders the Shares, at
the public offering price set forth on the cover page of this Prospectus
Supplement, less the underwriting discounts and commissions. The respective
number of Shares that each Underwriter has agreed to purchase is set forth
opposite its name:
 
<TABLE>
<CAPTION>
                                                                                                       NUMBER OF
             UNDERWRITER                                                                                 SHARES
- -----------------------------------------------------------------------------------------------------  ----------
<S>                                                                                                    <C>
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated...............................................................................   1,658,804
Donaldson, Lufkin & Jenrette Securities Corporation..................................................   1,658,801
Goldman, Sachs & Co..................................................................................   1,658,801
J.P. Morgan Securities Inc...........................................................................   1,658,801
                                                                                                       ----------
          Total......................................................................................   6,635,207
                                                                                                       ----------
                                                                                                       ----------
</TABLE>
 
    In the Purchase Agreement, the Underwriters have agreed, subject to the
terms and conditions set forth in the Purchase Agreement, to purchase all of the
Shares being sold pursuant to the Purchase Agreement if any of such Shares being
sold pursuant to the Purchase Agreement are purchased.
 
    The Underwriters have advised the Selling Shareholders that they propose to
offer the Shares offered hereby to the public initially at the public offering
price set forth on the cover page of this Prospectus Supplement and to certain
dealers at such price less a concession not in excess of $.43 per Share. The
Underwriters may allow, and such dealers may reallow, a discount not in excess
of $.10 per Share on sales to certain other dealers. After the offering, the
public offering price, concession and discount may be changed.
 
    The Common Stock is traded on the New York Stock Exchange and the Pacific
Stock Exchange.
 
    The Underwriters are permitted to engage in certain transactions that
stabilize the price of the Common Stock. Such transactions consist of bids or
purchases for the purpose of pegging, fixing or maintaining the price of the
Common Stock.
 
    If the Underwriters create a short position in the Common Stock in
connection with the offering, i.e., if, they sell more shares of Common Stock
than are set forth on the cover page of this Prospectus Supplement, the
Underwriters may reduce that short position by purchasing Common Stock in the
open market.
 
    The Underwriters may also impose a penalty bid on certain selling group
members. This means that if the Underwriters purchase shares of Common Stock in
the open market to reduce the Underwriters short position or to stabilize the
price of the Common Stock, they may reclaim the amount of the selling concession
from the selling group members who sold those shares as part of the offering.
 
    In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher than
it might be in the absence of such purchases. The imposition of a penalty bid
might also have an effect on the price of a security to the extent that it were
to discourage resales of the security.
 
    Neither the Company nor the Underwriters make any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the Common
 
                                      S-4
<PAGE>
Stock. In addition, neither the Company nor the Underwriters make any
representation that the Underwriters will engage in such transactions or that
such transactions, once commenced, will not be discontinued without notice.
 
    DLJ has provided and is currently retained to provide certain investment
banking services to the Company for which it has received and is entitled to
receive usual and customary fees.
 
    JPMSI and certain of its affiliates have provided and are expected to
continue to provide certain investment banking and commercial banking services
to the Company for which they have received or will receive usual and customary
fees. Morgan Guaranty, an affiliate of JPMSI, was the arranging agent for the
Company's existing credit facility.
 
    The Company and the Selling Shareholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act.
 
                                 LEGAL MATTERS
 
    Certain legal matters with respect to the Shares offered hereby will be
passed upon for the Company by Scott M. Brown, Senior Vice President, Secretary
and General Counsel of the Company. As of March 31, 1997, Mr. Brown owned 2,794
shares of Common Stock and had outstanding options to purchase 201,634 shares of
Common Stock pursuant to Company benefit plans. The validity of the Shares
offered hereby will be passed upon for the Underwriters by Sullivan & Cromwell,
Los Angeles, California.
 
                                      S-5
<PAGE>
PROSPECTUS
 
                                9,580,644 SHARES
 
                                     [LOGO]
 
                          TENET HEALTHCARE CORPORATION
 
                                  COMMON STOCK
 
                               ------------------
 
    This Prospectus relates to 9,580,644 shares (the "Shares") of par value
$0.075 Common Stock (the "Common Stock") of Tenet Healthcare Corporation
("Tenet," the "Registrant" or the "Company") to be offered for sale by the
persons listed under the heading "Selling Shareholders" (the "Selling
Shareholders"). The Shares originally were issued by Tenet to Joseph Littlejohn
& Levy Fund, L.P. ("JLL") in connection with the acquisition of OrNda HealthCorp
("OrNda") by Tenet in January 1997 (the "Merger") and were subsequently
distributed to the Selling Shareholders who are partners in JLL. See "Selling
Shareholders." The distribution of the Shares by the Selling Shareholders may be
effected from time to time in underwritten public offerings, in ordinary
brokerage transactions on the New York Stock Exchange or the Pacific Stock
Exchange (collectively, the "Exchanges") at market prices prevailing at the time
of sale or in one or more negotiated transactions at prices acceptable to the
Selling Shareholders. In addition, the Selling Shareholders may sell the Shares
through or to brokers in the over-the-counter market. The brokers or dealers
through or to whom the Shares may be sold may be deemed underwriters of the
Shares within the meaning of the Securities Act of 1933, as amended (the
"Securities Act"), in which event all brokerage commissions or discounts and
other compensation received by such brokers or dealers may be deemed to be
underwriting compensation. To the extent required, the names of any underwriter
and applicable commissions or discounts and any other required information with
respect to any particular offer will be set forth in an accompanying Prospectus
Supplement. See "Plan of Distribution." The Company will not receive any of the
proceeds from sales of the Shares made hereunder.
 
    The Common Stock is listed on the Exchanges under the symbol "THC." On April
17, 1997, the closing price of the Common Stock on the New York Stock Exchange
Composite Tape was $25.875.
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 3 FOR A DISCUSSION OF CERTAIN FACTORS
THAT SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS IN EVALUATING AN INVESTMENT
IN THE COMMON STOCK.
 
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 April 17, 1997.
<PAGE>
                             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"). Reports, proxy
statements, registration statements and other information filed by the Company
with the Commission may 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: New York
Regional Office, Seven World Trade Center, New York, New York 10048; and Chicago
Regional Office, Citicorp Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661-2511; and copies of such material can be obtained from the Public
Reference Section of the Commission, 450 Fifth Street, N.W., Washington, D.C.
20549 at prescribed rates. The Commission also maintains a Web site at http://
www.sec.gov that contains reports, proxy statements and other information
regarding registrants that file electronically with the Commission. The reports,
proxy statements and other information filed by the Company also may be
inspected at the offices of the New York Stock Exchange, 20 Broad Street, New
York, New York 10005, and at the offices of the Pacific Stock Exchange
Incorporated, 301 Pine Street, San Francisco, California 94104. The Common Stock
is listed on such Exchanges.
 
    This Prospectus constitutes part of a Registration Statement on Form S-3
(together with all amendments and exhibits thereto, the "Registration
Statement") filed by the Company with the Commission under the Securities Act.
This Prospectus does not contain all of the information contained in the
Registration Statement and the exhibits and schedules thereto, and reference is
hereby made to the Registration Statement for further information with respect
to the Company and the Shares offered hereby. Any statements contained herein
concerning the provisions of any document filed as an exhibit to the
Registration Statement or otherwise filed with the Commission are not
necessarily complete, and in each instance reference is made to the copy of such
document so filed. Each such statement is qualified in its entirety by such
reference.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company with the Commission pursuant to
the Exchange Act (File No. I-7293) are incorporated in this Prospectus by
reference and are made a part hereof: (i) Annual Report on Form 10-K for the
fiscal year ended May 31, 1996, filed with the Commission on August 26, 1996
(the "Tenet 10-K"); (ii) Quarterly Report on Form 10-Q for the quarterly period
ended August 31, 1996, filed with the Commission on October 11, 1996; (iii)
Quarterly Report on Form 10-Q for the quarterly period ended November 30, 1996,
filed with the Commission on January 13, 1997; (iv) Quarterly Report on Form
10-Q for the quarterly period ended February 28, 1997, filed with the Commission
on April 15, 1997; (v) Current Report on Form 8-K, dated November 5, 1996, filed
with the Commission on November 5, 1996; (vi) Current Report on Form 8-K, dated
February 12, 1997, filed with the Commission on February 13, 1997; (vii) Current
Report on Form 8-K, dated April 10, 1997, filed with the Commission on April 11,
1997; (viii) Current Report on Form 8-K, dated April 16, 1997, filed with the
Commission on April 17, 1997; (ix) the description of the Common Stock of the
Company, which is contained in the Company's Registration Statement on Form 8-A
filed with the Commission on April 8, 1971, including any amendments or reports
filed for the purpose of updating such description; and (x) the description of
certain preferred stock purchase rights that have attached to the Common Stock,
which is contained in the Company's Registration Statement on Form 8-A filed
with the Commission on December 9, 1988, including any amendments or reports
filed for the purpose of updating such description.
 
    All documents filed by the Company with the Commission pursuant to Section
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 hereby of the Common
Stock, 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
 
                                       2
<PAGE>
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
statement. Any statement so modified or superseded shall not be deemed, except
as so modified or superseded, to constitute a part of this Prospectus.
 
    This Prospectus incorporates documents by reference which are not presented
herein or delivered herewith. Copies of all documents incorporated by reference
in this Prospectus (other than exhibits to such documents unless such exhibits
are specifically incorporated by reference into such documents) will be provided
without charge to each person to whom a copy of this Prospectus is delivered,
upon written or oral request of such person. Request for such copies should be
directed to Scott M. Brown, Secretary, Tenet Healthcare Corporation, P.O. Box
31907, Santa Barbara, California 93130, telephone number (805) 563-7000.
 
                                  RISK FACTORS
 
    IN ADDITION TO THE OTHER INFORMATION CONTAINED OR INCORPORATED BY REFERENCE
IN THIS PROSPECTUS, PROSPECTIVE INVESTORS SHOULD CONSIDER CAREFULLY THE
FOLLOWING FACTORS BEFORE PURCHASING THE COMMON STOCK OFFERED HEREBY.
 
CERTAIN FINANCING CONSIDERATIONS; LEVERAGE
 
    As of February 28, 1997, Tenet had $4.9 billion of outstanding indebtedness,
which amounted to approximately 58.5% of its total capitalization including
short-term borrowings and notes and the current portion of long-term debt.
 
    In connection with the Merger, on January 30, 1997, Tenet entered into a new
$2.3 billion credit agreement (the "New Credit Facility"). The New Credit
Facility includes covenants limiting, among other things, borrowings by, and
liens on the assets of, Tenet and its subsidiaries, investments, the sale of all
or substantially all assets and prepayment of subordinated debt, and prohibiting
the repurchase of Tenet stock or the payment of dividends, in addition to a
minimum consolidated net worth requirement and certain coverage ratio tests. In
addition, the indentures governing Tenet's outstanding public debt include,
among other things, covenants limiting the incurrence of additional debt and
liens and the payment of dividends. Tenet's failure to comply with any of these
covenants could result in an event of default under the New Credit Facility or
the public debt indentures, which in turn could cause an event of default to
occur under substantially all of Tenet's debt. An event of default could have a
material adverse effect on Tenet's business, financial condition and results of
operations.
 
    The degree to which Tenet is leveraged and the covenants applicable to its
outstanding indebtedness may adversely affect Tenet's ability to finance its
future operations and could limit its ability to pursue business opportunities
that may be in the interests of Tenet and its securityholders. In particular,
changes in medical technology, existing, proposed and future legislation,
regulations and the interpretation thereof, and the increasing importance of
managed care contracts and integrated healthcare delivery systems may require
significant investment in facilities, equipment, personnel or services. Although
Tenet believes that cash generated from operations, amounts available under its
New Credit Facility and its ability to access capital markets will be sufficient
to allow it to make such investments, there can be no assurance that Tenet will
be able to obtain the funds necessary to make such investments. Furthermore,
tax-exempt or government-owned competitors have certain financial advantages
such as endowments, charitable contributions, tax-exempt financing and exemption
from sales, property and income taxes not available to Tenet, providing them
with a potential competitive advantage in making such investments.
 
RISKS ASSOCIATED WITH ACQUISITION STRATEGY
 
    Tenet's ability to continue to compete successfully for managed care
contracts or to expand and enhance its integrated healthcare delivery systems
may depend upon, among other things, Tenet's ability to increase the number of
its facilities and services offered. Part of Tenet's business strategy is to
expand its
 
                                       3
<PAGE>
healthcare delivery systems and services through the acquisition of and
partnerships with hospitals, groups of hospitals, other healthcare businesses,
ancillary healthcare providers, physician practices and physician practice
assets. There can be no assurance that suitable acquisitions and partnerships
can be consummated on terms favorable to Tenet or that financing, if necessary,
can be obtained for such acquisitions. Further, there is no assurance that, as
Tenet continues to acquire or enter into partnerships with additional facilities
and related healthcare service providers in the geographic areas in which it
currently operates, it will not face constraints on its ability to grow from
Federal and state regulatory agencies. In addition, there can be no assurance
that Tenet will be able to operate profitably any hospitals, facilities,
businesses or other assets it may acquire or enter into partnerships with,
effectively integrate the operations of such acquisitions or partnerships or
otherwise achieve the intended benefits of such acquisitions and partnerships.
While management believes that certain cost savings may be realized as a result
of the Merger, there can be no assurance that any such savings will actually be
realized or as to the timing thereof.
 
COMPETITION
 
    The healthcare industry has been characterized in recent years by increased
competition for patients and staff physicians, excess capacity at general
hospitals, a shift from inpatient to outpatient treatment settings and increased
consolidation. New competitive strategies of hospitals and other healthcare
providers place increasing emphasis on the use of alternative healthcare
delivery systems (such as home health services, outpatient surgery and emergency
and diagnostic centers) that eliminate or reduce lengths of hospital stays. The
principal factors contributing to these trends are advances in medical
technology and pharmaceuticals, cost-containment efforts by managed care payors,
employers and traditional health insurers, changes in regulations and
reimbursement policies, increases in the number and type of competing healthcare
providers and changes in physician practice patterns. The revenues and operating
results of most of Tenet's hospitals are significantly affected by the
hospitals' ability to negotiate favorable contracts with managed care payors.
Tenet's future success will depend, in part, on the ability of Tenet's hospitals
to continue to attract and retain staff physicians, to enter into managed care
contracts and to organize and structure integrated healthcare delivery systems
with other healthcare providers and physician practice groups. There can be no
assurance that Tenet's hospitals will continue to be able to, on terms favorable
to Tenet, attract and retain physicians to their staffs, enter into managed care
contracts or organize and structure integrated healthcare delivery systems, for
which other healthcare companies with greater financial resources or a wider
range of services may be competing.
 
LIMITS ON REIMBURSEMENT
 
    Tenet derives a substantial portion of its net operating revenues from
third-party payors, including the Medicare and Medicaid programs. Changes in
government reimbursement programs have resulted in limitations on, increases in,
and in some cases reduced levels of, reimbursement for healthcare services, and
additional changes are anticipated. Such changes are likely to result in further
limitations on reimbursement levels especially because, in order to reach a
balanced budget, the U.S. Congress and the President are in favor of legislating
savings under both the Medicare and Medicaid programs. In addition, private
payors, including managed care payors, increasingly are demanding discounted fee
structures or the assumption by healthcare providers of all or a portion of the
financial risk through prepaid capitation arrangements. Inpatient utilization,
average lengths of stay and occupancy rates continue to be negatively affected
by payor-required pre-admission authorization and utilization review and by
payor pressure to maximize outpatient and alternative healthcare delivery
services for less acutely ill patients. In addition, efforts to impose reduced
allowances, greater discounts and more stringent cost controls by government and
other payors are expected to continue. Although Tenet is unable to predict the
effect these changes will have on its operations, as the number of patients
covered by managed care payors increases, significant limits on the scope of
services reimbursed and on reimbursement rates and fees could have a material
adverse effect on its business, financial condition and results of operations.
 
                                       4
<PAGE>
EXTENSIVE REGULATION
 
    The healthcare industry is subject to extensive Federal, state and local
regulation relating to licensure, conduct of operations, ownership of
facilities, addition of facilities and services and prices for services. In
particular, Medicare and Medicaid antikickback, antifraud and abuse amendments
codified under Section 1128B(b) of the Social Security Act (the "Antikickback
Amendments") prohibit certain business practices and relationships that might
affect the provision and cost of healthcare services reimbursable under Medicare
and Medicaid, including the payment or receipt of remuneration for the referral
of patients whose care will be paid for by Medicare or other governmental
programs. Sanctions for violating the Antikickback Amendments include criminal
penalties and civil sanctions, including fines and possible exclusion from
government programs such as the Medicare and Medicaid programs. Pursuant to the
Medicare and Medicaid Patient and Program Protection Act of 1987, the Department
of Health and Human Services ("HHS") has issued regulations that describe some
of the conduct and business relationships permissible under the Antikickback
Amendments ("Safe Harbors"). The fact that a given business arrangement does not
fall within a Safe Harbor does not render the arrangement PER SE illegal.
Business arrangements of healthcare service providers that fail to satisfy the
applicable Safe Harbor criteria, however, risk increased scrutiny by enforcement
authorities. Because Tenet may be less willing than some of its competitors to
enter into business arrangements that do not clearly satisfy the Safe Harbors,
it could be at a competitive disadvantage in entering into certain transactions
and arrangements with physicians and other healthcare providers. See "--Certain
Legal Proceedings."
 
    The "Health Insurance Portability and Accountability Act of 1996," which
became effective January 1, 1997, amends, among other things, Title XI (42
U.S.C. 1301 ET SEQ.) to broaden the scope of current fraud and abuse laws to
include all health plans, whether or not they are reimbursed as a Federal
program.
 
    In addition, Section 1877 of the Social Security Act, which restricts
referrals by physicians of Medicare and other government-program patients to
providers of a broad range of designated health services with which they have
ownership or certain other financial arrangements, was amended effective January
1, 1995, to significantly broaden the scope of prohibited physician referrals
under the Medicare and Medicaid programs to providers with which they have
ownership or certain other financial arrangements (the "Self-Referral
Prohibitions"). Many states have adopted or are considering similar legislative
proposals, some of which extend beyond the Medicaid program to prohibit the
payment or receipt of remuneration for the referral of patients and physician
self-referrals regardless of the source of the payment for the care. Tenet's
participation in and development of joint ventures and other financial
relationships with physicians and others could be adversely affected by these
amendments and similar state enactments. The Company systematically reviews all
of its operations to ensure that it complies with the Social Security Act and
similar state statutes.
 
    Both Federal and state government agencies have announced heightened and
coordinated civil and criminal enforcement efforts. One pilot project, Operation
Restore Trust, is focused on investigating healthcare providers in the home
health and nursing home industries as well as on medical suppliers to these
providers in California, Florida, Texas, Illinois and New York. Tenet provides
home health and nursing home care in California, Florida and Texas.
 
    Some states require state approval for construction and expansion of
healthcare facilities, including findings of need for additional or expanded
healthcare facilities or services. Certificates of Need, which are issued by
governmental agencies with jurisdiction over healthcare facilities, are at times
required for capital expenditures exceeding a prescribed amount, changes in bed
capacity or services and certain other matters. Following a number of years of
decline, the number of states requiring Certificates of Need is once again on
the rise as state legislators once again are looking at the Certificate of Need
process as a way to contain rising healthcare costs. At February 28, 1997, Tenet
operated hospitals in 18 states that require state approval under Certificate of
Need programs. Tenet is unable to predict whether it will be able to obtain any
Certificates of Need in any jurisdiction where such Certificates of Need are
required.
 
                                       5
<PAGE>
    Tenet is unable to predict the future course of Federal, state and local
regulation or legislation, including Medicare and Medicaid statutes and
regulations. Further changes in the regulatory framework could have a material
adverse effect on Tenet's business, financial condition and results of
operations.
 
HEALTHCARE REFORM LEGISLATION
 
    Healthcare is one of the largest industries in the United States and
continues to attract much legislative interest and public attention. Medicare,
Medicaid, mandatory and other public and private hospital cost-containment
programs, proposals to limit healthcare spending, proposals to limit prices and
industry competitive factors are highly significant to the healthcare industry.
In addition, the healthcare industry is governed by a framework of Federal and
state laws, rules and regulations that are extremely complex and for which the
industry has the benefit of little or no regulatory or judicial interpretation.
Although Tenet believes it is in compliance in all material respects with such
laws, rules and regulations, if a determination is made that the Company was in
material violation of such laws, rules or regulations, its business, financial
condition and results of operations could be materially adversely affected.
 
    There continue to be Federal and state proposals that would, and actions
that do, impose more limitations on government and private payments to providers
such as Tenet and proposals to increase co-payments and deductibles from program
and private patients. At the Federal level, both Congress and the President have
in the past, and are expected to in the future, propose healthcare budgets that
substantially reduce payments under the Medicare and Medicaid programs. For
example, in May 1996, both houses of Congress passed bills that would have
significantly reduced Medicare and Medicaid funding by limiting future increases
to the funding for such programs. Although President Clinton vetoed those bills,
the President's own proposals also propose to limit or reduce increases in
future Medicare and Medicaid payments.
 
    Many states have enacted or are considering enacting measures that are
designed to reduce their Medicaid expenditures and to make certain changes to
private healthcare insurance. Various states have applied, or are considering
applying, for a Federal waiver from current Medicaid regulations to allow them
to serve some of their Medicaid participants through managed care providers.
Tennessee has implemented such a revision and Texas has passed a law mandating
the state to apply for such a waiver. Louisiana also is considering wider use of
managed care for its Medicaid populations. California has created a voluntary
health insurance purchasing cooperative that seeks to make healthcare coverage
more affordable for businesses with five to 50 employees and, effective January
1, 1995, began changing the payment system for participants in its Medicaid
program in certain counties from fee-for-service arrangements to managed care
plans. Florida limits the amount by which a hospital's net revenues per
admission may be increased each year, has enacted a program creating a system of
local purchasing cooperatives and has proposed other changes that have not yet
been enacted. Florida has adopted, and other states are considering adopting,
legislation imposing a tax on revenues of hospitals to help finance or expand
those states' Medicaid systems. A number of other states are considering the
enactment of managed care initiatives designed to provide universal low-cost
coverage. These proposals also may attempt to include coverage for some people
who presently are uninsured.
 
    While Tenet anticipates that payments to hospitals will be reduced as a
result of future federal and state legislation, it is uncertain at this time
what legislation regarding healthcare reform may ultimately be enacted or
whether other changes in the administration or interpretation of governmental
healthcare programs will occur. There can be no assurance that future healthcare
legislation or other changes in the administration or interpretation of
governmental healthcare programs will not have a material adverse effect on
Tenet's business, financial condition and results of operations. A significant
reduction in the amount of payments received by hospitals under government
programs such as Medicare and Medicaid could have a material adverse effect on
Tenet's business, financial condition and results of operations.
 
                                       6
<PAGE>
CERTAIN LEGAL PROCEEDINGS
 
    Tenet continues to defend a greater than normal level of litigation relating
to its subsidiaries' former psychiatric operations. The majority of the lawsuits
filed contain allegations of medical malpractice as well as allegations of fraud
and conspiracy against Tenet and certain of its subsidiaries and former
employees. Also named as defendants are numerous doctors and other healthcare
professionals. Tenet believes that the increase in litigation arose primarily
from advertisements made by certain lawyers seeking former psychiatric patients
in order to file claims against Tenet and certain of its subsidiaries. The
advertisements focused, in many instances, on Tenet's settlement of past
disputes involving the operations of its discontinued psychiatric business,
including Tenet's 1994 resolution of the Federal government's investigation and
a corresponding criminal plea agreement involving such discontinued psychiatric
business of Tenet. Among the suits filed during fiscal 1995 were two lawsuits in
Texas state court with approximately 740 individual plaintiffs at present who
purport to have been patients in certain Texas psychiatric facilities. During
fiscal 1996, 64 plaintiffs voluntarily withdrew from one of the lawsuits and
Tenet's motion to recuse the original trial judge in that lawsuit has been
granted. The cases of three of the 740 individual plaintiffs within one of the
lawsuits currently are set for trial in April 1997.
 
    During fiscal 1995 and 1996, lawsuits with approximately 210 plaintiffs at
present who purport to have been patients in certain Washington, D.C.
psychiatric facilities, containing allegations similar to those contained in the
Texas cases described above, were filed in the District of Columbia.
 
    In addition to the above, a purported class action was filed in Texas state
court in May 1995, containing allegations of fraud and conspiracy similar to
those described in the preceding paragraphs. The plaintiff purports to represent
all persons who were voluntarily admitted to one of 11 psychiatric hospitals in
Texas between January 1, 1981 and December 31, 1991, and satisfied certain other
criteria. In February 1996, this case was removed to Federal court. A motion by
the plaintiff to remand the case to Texas state court has been denied. A class
has not been certified and Tenet believes that a class is not capable of being
certified.
 
    Tenet expects that additional lawsuits with similar allegations will be
filed. Tenet believes it has a number of defenses to each of these actions and
will defend these and any additional lawsuits vigorously. Until the lawsuits are
resolved, however, Tenet will continue to incur substantial legal expenses.
Although, based upon information currently available to it, management believes
that the amount of damages, if any, in excess of the reserves Tenet has recorded
for unusual litigation costs that may be awarded in any of the foregoing
unresolved legal proceedings cannot reasonably be estimated, management does not
believe it is likely that any such damages will have a material adverse effect
on Tenet's business, financial condition and results of operations. There can be
no assurance, however, that the ultimate liability will not exceed such
reserves, which primarily represent the estimated costs of defending the
actions.
 
    Two additional Federal class actions filed in August 1993 were consolidated
into one action pending in the U.S. District Court in the Central District of
California captioned In re: National Medical Enterprises Securities Litigation
II. These consolidated actions are on behalf of a purported class of
shareholders who purchased or sold stock of Tenet between January 14, 1993 and
August 26, 1993, and allege that each of the defendants violated Section 10(b)
of the Exchange Act. Based on these claims, plaintiffs seek compensatory
damages, injunctive relief, attorneys' fees, interest and costs. Tenet believes
it has meritorious defenses to this action and will defend this litigation
vigorously.
 
                                       7
<PAGE>
                                  THE COMPANY
 
    Tenet is the second largest investor-owned healthcare services company in
the United States. At February 28, 1997, Tenet's subsidiaries owned or leased
and operated 127 general hospitals (with 27,366 licensed beds) and related
healthcare facilities serving urban and rural communities in 22 states. Tenet's
subsidiaries and affiliates also owned or leased and operated various ancillary
healthcare businesses, including outpatient surgery centers, home healthcare
programs, ambulatory, occupational and rural healthcare clinics, a health
maintenance organization, a preferred provider organization and a managed care
insurance company as well as a small number of rehabilitation hospitals,
specialty hospitals, long-term care facilities and psychiatric facilities. In
addition, Tenet's subsidiaries hold the following investments in other
healthcare companies: (i) an approximately 12.1% interest in Vencor, Inc., which
operates nursing homes and other healthcare businesses, (ii) an approximately
11.3% interest in Total Renal Care Holdings, Inc., which operates kidney
dialysis units and certain related healthcare businesses and (iii) an
approximately 23% interest in Health Care Property Partners.
 
    On January 30, 1997, Tenet completed its acquisition of OrNda, which, with
49 general hospitals (9,599 licensed beds) at November 30, 1996, was the third
largest investor-owned healthcare services company in the United States. Many of
the hospitals acquired in the Merger are located in geographic areas where Tenet
was already operating hospitals, including southern California and south
Florida. The Merger also expanded Tenet's operations into several new geographic
areas, including Arizona, Iowa, Massachusetts, Mississippi, Nevada, Oregon,
Washington, West Virginia and Wyoming. The Merger was accounted for on a pooling
of interests basis. OrNda (now known as Tenet HealthSystem HealthCorp) is now a
wholly owned subsidiary of Tenet.
 
    The Company's principal executive offices are located at 3820 State Street,
Santa Barbara, California 93105, and its telephone number is (805) 563-7000.
 
                                USE OF PROCEEDS
 
    All of the Shares offered hereby are being offered by the Selling
Shareholders. The Company will not receive any proceeds from the sale of the
Shares. See "Selling Shareholders."
 
                               BUSINESS STRATEGY
 
    The Company's strategic objective is to provide quality healthcare services
responsive to the current managed care environment. Tenet believes that
competition among healthcare providers occurs primarily at the local level.
Accordingly, the Company tailors its local strategies to address the specific
competitive characteristics of the geographic areas in which it operates,
including the number of facilities operated by Tenet, the nature and structure
of physician practices and physician groups, the extent of managed care
penetration, the number and size of competitors and the demographic
characteristics of the area. Key elements of the Company's strategy are:
 
    - to develop integrated healthcare delivery systems by coordinating the
      operations and services of the Company's facilities with other hospitals
      and ancillary care providers and through alliances with physicians and
      physician groups;
 
    - to reduce costs through enhanced operating efficiencies while improving
      the quality of care provided;
 
    - to develop and maintain its strong relationships with physicians and
      generally to foster a physician-friendly culture;
 
    - to enter into discounted fee for service arrangements, capitated contracts
      and other managed care contracts with third party payors; and
 
                                       8
<PAGE>
    - to acquire and enter into strategic partnerships with hospitals, groups of
      hospitals, other healthcare businesses, ancillary healthcare providers,
      physician practices and physician practice assets where appropriate to
      expand and enhance quality integrated healthcare delivery systems
      responsive to the current managed care environment.
 
                              BUSINESS DESCRIPTION
 
    The Company's subsidiaries own or lease and operate 127 general hospitals
(27,366 licensed beds) serving communities in 22 states. In addition, the
Company's subsidiaries own or lease and operate numerous ancillary healthcare
facilities, including a small number of rehabilitation hospitals, long-term care
facilities and psychiatric facilities located on the same campus as, or nearby,
their general hospitals, and operated all or a substantial part of 145 medical
office buildings as of February 28, 1997. With the exception of one general
hospital that was acquired in fiscal 1996 and is in the process of becoming
accredited for the first time, each of the Company's facilities that is eligible
for accreditation is fully accredited by the Joint Commission on Accreditation
of Healthcare Organizations ("JCAHO"), or another appropriate accreditation
agency. With such accreditation, the Company's hospitals are eligible to
participate in the Medicare and Medicaid programs.
 
    Each of Tenet's general hospitals offers acute care services and most offer
operating and recovery rooms, radiology services, intensive care and coronary
care nursing units, pharmacies, clinical laboratories, respiratory therapy
services, physical therapy services and outpatient facilities. A number of the
hospitals also offer tertiary care services such as open heart surgery, neonatal
intensive care, neuroscience, orthopedics services and oncology services. Three
of the Company's hospitals, Memorial Medical Center (formerly known as
MercyBaptist Medical Center), USC University Hospital and Sierra Medical Center,
offer quartenary care in such areas as heart, lung, liver and kidney transplants
and USC University Hospital and Sierra Medical Center also offer gamma knife
brain surgery.
 
    Technological developments permitting more procedures to be performed on an
outpatient basis, in conjunction with pressures to contain healthcare costs,
have led to a shift from inpatient care to ambulatory or outpatient care. Tenet
has responded to this trend by enhancing its hospitals' outpatient service
capabilities, including (i) establishing freestanding outpatient surgery centers
at or near certain of its hospital facilities, (ii) reconfiguring certain
hospitals to more effectively accommodate outpatient treatment by, among other
things, providing more convenient registration procedures and separate
entrances, and (iii) restructuring existing surgical capacity to allow a greater
number and range of procedures to be performed on an outpatient basis. Tenet's
facilities will continue to emphasize those outpatient services that can be
provided on a quality, cost-effective basis and that the Company believes will
experience increased demand. The patient volumes and net operating revenues at
both the Company's general hospitals and its outpatient surgery centers are
subject to seasonal variations caused by a number of factors, including but not
necessarily limited to, seasonal cycles of illness, climate and weather
conditions, vacation patterns of both patients and physicians and other factors
relating to the timing of elective procedures.
 
    In addition, inpatient care is continuing to move from acute care to
sub-acute care, where a less-intensive level of care is provided. Tenet has been
proactive in the development of a variety of sub-acute inpatient services to
utilize a portion of its unused capacity, thereby retaining a larger share of
overall healthcare expenditures. By offering cost-effective ancillary services
in appropriate circumstances, Tenet is able to provide a continuum of care where
the demand for such services exists. For example, in certain hospitals the
Company has developed transitional care, rehabilitation and long-term care
sub-acute units. Such units utilize less intensive staffing levels to provide
the range of services sought by payers with a lower cost structure.
 
    Tenet's subsidiaries, including OrNda, have acquired 17 general hospitals
(or interests in general hospitals) since June 1, 1995: (1) in July 1995, a
one-third interest (which subsequently was increased to a
 
                                       9
<PAGE>
50% interest) in the 82-bed St. Clair Hospital located outside of Birmingham,
Alabama, which formerly was a not-for-profit general hospital; (2 and 3) in
August 1995, Memorial Medical Center (formerly known as MercyBaptist Medical
Center), formerly a not-for-profit system, consisting of two general hospitals
with an aggregate of 759 licensed beds located in New Orleans, Louisiana, and
related physician practices; (4) in September 1995, Providence Memorial Hospital
located in El Paso, Texas, which also was a not-for-profit general hospital.
Providence is licensed for 471 general hospital beds (34 of which may be used as
skilled nursing beds) and is licensed for 30 additional rehabilitation and
subacute care beds; (5) in October 1995, a long-term lease of the 49-bed Medical
Center of Manchester and its home health business, in central Tennessee; (6) in
November 1995, the 104-bed Methodist Hospital of Jonesboro, a not-for-profit
general hospital located in Jonesboro, Arkansas. That hospital now is owned by a
limited liability company of which Tenet owns 95% and is the manager and Tenet's
not-for-profit partner St. Vincent TotalHealth Corporation, owns 5%; (7) in
November 1995, the 202-bed University Medical Center (subsequently re-named
Florida Medical Center--South) located in Plantation, Florida; (8) in January
1996, the 498-bed Houston Northwest Medical Center located in Houston, Texas;
(9) in June 1996, the 378-bed Hialeah Hospital located in Hialeah, Florida; (10)
in July 1996, the 136-bed Cypress Fairbanks Medical Center located in Houston,
Texas; (11) in August 1996, the 400-bed Centinela Hospital Medical Center
located in Inglewood, California; (12) in September 1996, the 329-bed Saint
Vincent Hospital located in Worcester, Massachusetts; (13) in October 1996, the
319-bed Lloyd Noland Hospital located in Birmingham, Alabama; (14 and 15) in
December 1996, the 296-bed Western Medical Center located in Santa Ana,
California and the 193-bed Western Medical Center-Anaheim located in Anaheim,
California; (16 and 17) in January 1997, the 357-bed North Shore Medical Center
located in Miami, Florida and a long-term lease of the 312-bed Brookside
Hospital located in San Pablo, California.
 
    In addition, in August 1995, Tenet entered into an agreement with the
Cleveland Clinic Florida to develop a new 150-bed general hospital in western
Broward County, Florida. Completion of that project is subject to governmental
approvals. In the fourth quarter of fiscal 1996, Tenet converted the Jo Ellen
Smith general hospital in New Orleans, Louisiana, into a specialty hospital. In
April 1997, Tenet signed a definitive agreement for a long-term lease of the
398-bed Desert Hospital located in Palm Springs, California. That transaction is
expected to close by the end of May.
 
                        KEY ELEMENTS OF TENET'S STRATEGY
 
    DEVELOP INTEGRATED HEALTHCARE DELIVERY SYSTEMS.  In most geographic areas it
serves, Tenet has established or is developing an integrated healthcare delivery
system to offer a full range of quality patient care responsive to the current
managed care environment by coordinating the services offered by its hospitals
and related facilities with the services offered by other providers. The Company
believes that general hospitals will serve as the hubs for the development of
integrated healthcare delivery systems due to their highly developed
infrastructure, extensive service base, sophisticated equipment and skilled
personnel.
 
    The Company's strategy is implemented in a number of ways depending upon the
characteristics of the local area. In areas where there is significant managed
care penetration or in which the Company anticipates such penetration, the
Company encourages physicians practicing at its hospitals to form independent
physician associations ("IPAs"). As part of its strategy, the Company intends to
form physician hospital organizations ("PHOs") that bring together its hospitals
and IPAs, physicians or physician groups under a variety of arrangements to
negotiate for managed care contracts, including capitated contracts. Tenet has
formed a PHO for the New Orleans area and is in the process of forming PHOs in
several other geographic areas. The Company also has formed management service
organizations ("MSOs"), which provide management and administrative services to
physicians, physician group practices and IPAs, and which enter into managed
care contracts on behalf of these groups and, in certain circumstances in the
future, PHOs. Where appropriate, the Company also purchases physician and
physician group practices and employs such physicians or purchases the assets of
those practices and manages such practices through its MSOs or otherwise.
 
                                       10
<PAGE>
    The Company uses various combinations of one or all of the foregoing methods
in each geographic area to create a community of interest between its hospitals
and the physicians who practice there, to which it adds additional resources,
where necessary, to create an integrated healthcare delivery system capable of
providing a full range of healthcare services to the community. In areas where
the Company has a significant presence, such as southern California, south
Florida, and the greater New Orleans area, it uses its own resources to
establish and expand its integrated healthcare delivery systems.
 
    For example, in California, the Company is developing the Tenet California
HealthSystem, an integrated healthcare delivery system linking Tenet's 45
general hospitals (33 of which are in southern California) and other health care
facilities in California with physicians and other healthcare professionals as
well as other healthcare providers' facilities in geographic areas throughout
the state. In south Florida, the Company has created the Tenet South Florida
HealthSystem, an integrated healthcare delivery system consisting of 12 general
hospitals (six of which are tertiary care hospitals), and numerous related
healthcare operations. In the greater New Orleans area the Company has
established and is expanding the Tenet Louisiana HealthSystem, an integrated
healthcare delivery system with eight general hospitals, several specialty care
hospitals and numerous other healthcare operations.
 
    Another example of how this integrated delivery strategy is being
implemented is the Company's Redding Medical Center, a tertiary care hospital
located in a primarily rural area in northern California, around which hospital
the Company is developing such a system, with the hospital itself acting as the
hub. Affiliations with physician practices, non-Tenet primary care hospitals, an
outpatient surgery center developed in partnership with local physicians and
affiliated ancillary care providers in the surrounding area enable this system
to provide a full range of healthcare services. In addition, the Company has
introduced its HMO product to this geographic area. The Company believes that
the development of such integrated healthcare delivery systems will enhance its
ability to contract with payors in those areas that have experienced or will
experience a high degree of managed care penetration.
 
    REDUCE COSTS THROUGH ENHANCED OPERATING EFFICIENCY WHILE IMPROVING THE
QUALITY OF CARE.  The Company continues to position itself as a provider of
quality healthcare services responsive to the current managed care environment
by enhancing operating efficiencies at the hospital, regional and corporate
levels. For example, the Company has implemented programs at the hospital level
to monitor and adjust staffing levels in response to patient acuity and hospital
census, and to improve service and the quality of outcomes while reducing
operating expenses through the reengineering of the delivery of patient care in
its hospitals. At several of the Company's hospitals, job functions have been
redefined and services have been moved directly to the patient floors. Tenet
believes that increasing the amount of patient care delivered at the bedside
will increase patient satisfaction while reducing costs. This initiative also
has enhanced the ability of professionals to focus their attention on higher
levels of patient care.
 
    In order to reduce costs and achieve economies of scale at the regional
level, the Company has combined the hospital business offices of facilities
located in close geographic proximity. Consolidating business offices allows the
Company's hospitals to reduce staffing levels while enhancing the effectiveness
of their billing and collection efforts. The Company also has reduced costs and
achieved economies of scale at the hospital, regional and corporate levels by
consolidating the collection of accounts receivable through its Syndicated
Office Systems debt collection subsidiary and negotiating purchase contracts
that take greater advantage of its group purchasing program. In addition,
management believes that certain cost savings may be realized following the
Merger. No assurances can be made as to the amount of cost savings, if any, that
actually will be realized.
 
    DEVELOP AND MAINTAIN STRONG RELATIONSHIPS WITH PHYSICIANS.  Tenet believes
that its success will depend in large part on maintaining strong relationships
with physicians. To better serve the needs of its patients, Tenet has devoted
substantial management effort and resources to establishing and maintaining such
relationships and to fostering a physician-friendly culture at each of its
hospitals. The Company attracts physicians to its hospitals by equipping its
hospitals with technologically advanced equipment, sponsoring
 
                                       11
<PAGE>
training programs to educate physicians on advanced medical procedures, using
governing boards for each hospital, the primary voting members of which are
physicians and community members and otherwise creating an environment within
which physicians prefer to practice. The Company often is at the forefront in
introducing new services, medical equipment and medical technologies designed to
improve patient care and assist physicians. These efforts serve the dual
purposes of developing and maintaining strong relationships with physicians and
better serving the needs of patients.
 
    The Company looks to physicians to play an active role in the governance of
its hospitals. For example, each of the Company's hospitals has a governing
board, the members of which primarily are physicians who are members of the
medical staff and local community members. These boards develop short and
long-term plans for the hospitals and review and approve, as appropriate,
actions of the medical staff, including staff appointments, credentialing, peer
review and quality assurance. The Company also maintains a physician advisory
board that provides advice to the Company with respect to long-term strategy,
emerging technologies, training programs and significant hospital operational
issues. This advisory board serves as another vehicle through which physicians
on the staffs of the Company's hospitals can communicate their views to the
Company.
 
    ENTER INTO MANAGED CARE CONTRACTS.  The Company believes that its extensive
experience operating in California, which has a high degree of managed care
penetration, will enhance its ability to compete successfully in other
geographic areas that are experiencing an increase in managed care. Pressures to
control healthcare costs have resulted in a continuing increase in the
percentage of the United States population that is covered by managed healthcare
plans. To increase the cost-effectiveness of healthcare delivery, managed care
payors have introduced new utilization review systems, increased the use of
discounted and capitated fee arrangements and have attempted, where appropriate,
to direct patients to less intensive alternatives along the continuum of patient
care. Managed care payors typically require members or provide financial
incentives for members to utilize only those healthcare providers that have
contracted with such payors to provide care on a discounted or capitated basis.
Accordingly, in order to maintain and increase their patient base as managed
care penetration increases, it is important for providers to enter into such
contracts. In determining with which providers to contract, payors consider,
among other factors, the quality of care provided, the range of services, the
geographic coverage and the cost-effectiveness of the care provided. Tenet
believes that the development and expansion of its integrated healthcare
delivery systems will enable it to better compete for managed care contracts,
which, in turn, should allow it to expand its patient volume and cash flow,
notwithstanding the reduced rates at which services may be provided under such
contracts.
 
    PURSUE STRATEGIC ACQUISITIONS AND PARTNERSHIPS.  The Company intends to
continue to pursue aggressively strategic acquisitions of and partnerships with
hospitals, other healthcare businesses, ancillary healthcare providers,
physician practices and physician practice assets, where appropriate, to expand
and enhance its integrated healthcare delivery systems. Examples of recent
strategic acquisitions are the Company's June 1996 acquisition of Hialeah
Hospital, a 378-bed general hospital located in Hialeah, Florida and the January
1997 acquisition of North Shore Medical Center, a 357-bed general hospital
located in Miami, Florida. Hialeah Hospital's location in Hialeah and North
Shore Medical Center's location in Miami, both in north Dade County, have
enhanced the geographic coverage of the Tenet South Florida HealthSystem and
increased the number of general hospitals in that system to 12. Tenet believes
that significant opportunities exist to enter into additional partnerships and
make strategic acquisitions, where appropriate, in the furtherance of its
strategy.
 
                                       12
<PAGE>
                              DOMESTIC PROPERTIES
 
    The following table sets forth certain information relating to each of the
127 hospitals (27,366 licensed beds) operated by the Company at February 28,
1997. Two of those hospitals currently are being independently managed pursuant
to an agreement entered into with the Federal Trade Commission in connection
with the Merger, one of which the Company expects to sell by August 1, 1997, and
the other of which will resume being managed by the Company upon the sale of the
first.
<TABLE>
<CAPTION>
                                                                                                               LICENSED
     GEOGRAPHIC AREA/STATE                            FACILITY                              LOCATION             BEDS
- -------------------------------  ---------------------------------------------------  ---------------------  -------------
<S>                              <C>                                                  <C>                    <C>
Southern California              Alvarado Hospital Medical Center                     San Diego                      231
                                 Brotman Medical Center                               Culver City                    438
                                 Centinela Hospital Medical Center                    Inglewood                      400
                                 Century City Hospital (1)                            Los Angeles                    190
                                 Chapman Medical Center (1)                           Orange                         135
                                 Coastal Communities Hospital (2)                     Santa Ana                      177
                                 Community Hospital of Huntington Park (1)            Huntington Park                 99
                                 Encino Hospital (1)(3)                               Encino                         151
                                 Fountain Valley Regional Hospital and Medical
                                   Center                                             Fountain Valley                413
                                 Garden Grove Hospital and Medical Center             Garden Grove                   167
                                 Garfield Medical Center                              Monterey Park                  211
                                 Greater El Monte Community Hospital                  South El Monte                 113
                                 Harbor View Medical Center                           San Diego                      156
                                 Irvine Medical Center (1)                            Irvine                         176
                                 John F. Kennedy Memorial Hospital                    Indio                          130
                                 Lakewood Regional Medical Center                     Lakewood                       161
                                 Los Alamitos Medical Center                          Los Alamitos                   173
                                 Medical Center of North Hollywood                    North Hollywood                160
                                 Midway Hospital Medical Center                       Los Angeles                    225
                                 Mission Hospital of Huntington Park                  Huntington Park                127
                                 Monterey Park Hospital                               Monterey Park                  102
                                 Placentia Linda Community Hospital                   Placentia                      114
                                 San Dimas Community Hospital                         San Dimas                       93
                                 Santa Ana Hospital Medical Center (1)                Santa Ana                       90
                                 South Bay Medical Center (1)                         Redondo Beach                  201
                                 St. Luke Medical Center                              Pasadena                       165
                                 Suburban Medical Center (1)                          Paramount                      184
                                 Tarzana Regional Medical Center (1)(3)               Tarzana                        233
                                 USC University Hospital (4)                          Los Angeles                    286
                                 Western Medical Center--Anaheim                      Anaheim                        193
                                 Western Medical Center                               Santa Ana                      296
                                 Whittier Hospital Medical Center                     Whittier                       159
                                 Woodruff Community Hospital                          Long Beach                      96
Northern and Other California    Brookside Hospital (1)                               San Pablo                      312
                                 Community Hospital & Rehabilitation Center of Los
                                   Gatos (1)                                          Los Gatos                      164
                                 Doctors Hospital of Manteca                          Manteca                         73
                                 Doctors Medical Center of Modesto                    Modesto                        433
                                 Doctors Hospital of Pinole (1)                       Pinole                         137
                                 French Hospital Medical Center (5)                   San Luis Obispo                147
                                 Redding Medical Center                               Redding                        185
                                 San Ramon Regional Medical Center                    San Ramon                      123
                                 Sierra Vista Regional Medical Center                 San Luis Obispo                199
                                 Twin Cities Community Hospital                       Templeton                       84
                                 Valley Community Hospital (1)(6)                     Santa Maria                     70
South Florida                    Coral Gables Hospital (7)                            Coral Gables                   273
                                 Delray Community Hospital                            Delray Beach                   224
                                 Florida Medical Center (8)                           Ft. Lauderdale                 459
                                 Florida Medical Center, South (8)                    Plantation                     202
 
<CAPTION>
 
     GEOGRAPHIC AREA/STATE        STATUS
- -------------------------------  ---------
<S>                              <C>
Southern California              Owned
                                 Owned
                                 Owned
                                 Leased
                                 Leased
                                 Owned
                                 Leased
                                 Leased
 
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Leased
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Leased
                                 Leased
                                 Owned
                                 Leased
                                 Leased
                                 Leased
                                 Owned
                                 Owned
                                 Owned
                                 Owned
Northern and Other California    Leased
 
                                 Leased
                                 Owned
                                 Owned
                                 Leased
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Leased
South Florida                    Owned
                                 Owned
                                 Owned
                                 Owned
</TABLE>
 
                                       13
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               LICENSED
     GEOGRAPHIC AREA/STATE                            FACILITY                              LOCATION             BEDS
- -------------------------------  ---------------------------------------------------  ---------------------  -------------
<S>                              <C>                                                  <C>                    <C>
                                 Hialeah Hospital                                     Hialeah                        378
                                 Hollywood Medical Center                             Hollywood                      324
                                 North Ridge Medical Center                           Ft. Lauderdale                 391
                                 North Shore Medical Center                           Miami                          357
                                 Palm Beach Gardens Medical Center (1)                Palm Beach Gardens             204
                                 Palmetto General Hospital                            Hialeah                        360
                                 Parkway Regional Medical Center (9)                  North Miami                    689
                                 West Boca Medical Center                             Boca Raton                     185
Tampa/St. Petersburg, Florida    Memorial Hospital of Tampa Area                      Tampa                          174
                                 North Bay Medical Center                             New Port Richey                122
                                 Palms of Pasadena Hospital                           St. Petersburg                 310
                                 Seven Rivers Community Hospital                      Crystal River                  128
                                 Town and Country Hospital                            Tampa                          201
New Orleans, Louisiana Area      Doctors Hospital of Jefferson (1)                    Metairie                       138
                                 Kenner Regional Medical Center                       Kenner                         300
                                 Meadowcrest Hospital                                 Gretna                         200
                                 Memorial Medical Center Mid-City                     New Orleans                    272
                                 Memorial Medical Center Uptown                       New Orleans                    526
                                 Northshore Regional Medical Center (1)               Slidell                        174
                                 St. Charles General Hospital                         New Orleans                    173
Phoenix/Tucson, Arizona          Community Hospital Medical Center                    Phoenix                         43
                                 Mesa General Hospital Medical Center (1)             Mesa                           125
                                 St. Luke's Medical Center (1)                        Phoenix                        276
                                 Tempe St. Luke's Hospital (1)                        Tempe                          110
                                 Tucson General Hospital                              Tucson                         119
Dallas, Texas Area               Doctors Hospital                                     Dallas                         268
                                 Garland Community Hospital                           Garland                        113
                                 Lake Pointe Medical Center (10)                      Rowlett                         92
                                 RHD Memorial Medical Center (1)                      Dallas                         190
                                 Trinity Medical Center (1)                           Carrollton                     149
Houston, Texas Area              Cypress Fairbanks Medical Center                     Houston                        149
                                 Houston Northwest Medical Center (11)                Houston                        498
                                 Park Plaza Hospital (12)                             Houston                        468
                                 Sharpstown General Hospital                          Houston                        190
                                 Twelve Oaks Hospital                                 Houston                        336
Other Texas                      Brownsville Medical Center                           Brownsville                    177
                                 Mid-Jefferson Hospital                               Nederland                      138
                                 Nacogdoches Medical Center                           Nacogdoches                    150
                                 Odessa Regional Hospital (13)                        Odessa                         100
                                 Park Place Medical Center                            Port Arthur                    244
                                 Providence Memorial Hospital                         El Paso                        471
                                 Sierra Medical Center                                El Paso                        365
                                 South Park Hospital and Medical Center               Lubbock                        101
                                 Southwest General Hospital                           San Antonio                    286
                                 Trinity Valley Medical Center                        Palestine                      150
Alabama                          Brookwood Medical Center                             Birmingham                     586
                                 Lloyd Noland Hospital                                Birmingham                     319
                                 St. Clair Hospital (1)(14)                           Birmingham                      82
Arkansas                         Central Arkansas Hospital                            Searcy                         193
                                 Methodist Hospital of Jonesboro (15)                 Jonesboro                      104
                                 National Park Medical Center                         Hot Springs                    165
                                 St. Mary's Regional Hospital                         Russellville                   170
Georgia                          North Fulton Regional Hospital (1)                   Roswell                        167
                                 Spalding Regional Hospital                           Griffin                        160
Indiana                          Culver Union Hospital                                Crawfordsville                 120
                                 Winona Memorial Hospital                             Indianapolis                   148
Missouri                         Columbia Regional Hospital (16)                      Columbia                       265
                                 Lucy Lee Hospital (1)                                Poplar Bluff                   201
                                 Lutheran Medical Center                              St. Louis                      408
 
<CAPTION>
 
     GEOGRAPHIC AREA/STATE        STATUS
- -------------------------------  ---------
<S>                              <C>
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Leased
                                 Owned
                                 Owned
                                 Owned
Tampa/St. Petersburg, Florida    Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
New Orleans, Louisiana Area      Leased
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Leased
                                 Owned
Phoenix/Tucson, Arizona          Owned
                                 Leased
                                 Leased
                                 Leased
                                 Owned
Dallas, Texas Area               Owned
                                 Owned
                                 Owned
                                 Leased
                                 Leased
Houston, Texas Area              Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
Other Texas                      Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
Alabama                          Owned
                                 Owned
                                 Leased
Arkansas                         Owned
                                 Owned
                                 Owned
                                 Owned
Georgia                          Leased
                                 Owned
Indiana                          Owned
                                 Owned
Missouri                         Owned
                                 Leased
                                 Owned
</TABLE>
 
                                       14
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               LICENSED
     GEOGRAPHIC AREA/STATE                            FACILITY                              LOCATION             BEDS
- -------------------------------  ---------------------------------------------------  ---------------------  -------------
<S>                              <C>                                                  <C>                    <C>
                                 Twin Rivers Regional Medical Center                  Kennett                        118
North Carolina                   Central Carolina Hospital                            Sanford                        137
                                 Frye Regional Medical Center (1)                     Hickory                        355
Oregon                           Eastmoreland Hospital                                Portland                       100
                                 Woodland Park Hospital (4)                           Portland                       209
South Carolina                   East Cooper Community Hospital                       Mount Pleasant                 100
                                 Hilton Head Hospital (17)                            Hilton Head                     64
                                 Piedmont Medical Center                              Rock Hill                      268
Tennessee                        John W. Harton Regional Medical Center               Tullahoma                      137
                                 Medical Center of Manchester (1)                     Manchester                      49
                                 Saint Francis Hospital                               Memphis                        693
                                 University Medical Center                            Lebanon                        261
Nine additional states           Davenport Medical Center                             Davenport, IA                  150
                                 Gulf Coast Medical Center                            Biloxi, MI                     189
                                 Lake Meade Hospital Medical Center                   North Las Vegas, NV            198
                                 Lander Valley Medical Center                         Lander, WY                     102
                                 Minden Medical Center                                Minden, LA                     121
                                 Plateau Medical Center                               Oak Hill, WV                    91
                                 Puget Sound Hospital                                 Tacoma, WA                     160
                                 Saint Joseph Hospital (18)                           Omaha, NE                      374
                                 Saint Vincent Hospital                               Worcester, MA                  329
 
<CAPTION>
 
     GEOGRAPHIC AREA/STATE        STATUS
- -------------------------------  ---------
<S>                              <C>
                                 Owned
North Carolina                   Owned
                                 Leased
Oregon                           Owned
                                 Leased
South Carolina                   Owned
                                 Owned
                                 Owned
Tennessee                        Owned
                                 Leased
                                 Owned
                                 Owned
Nine additional states           Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
                                 Owned
</TABLE>
 
- ------------------------------
 
(1) Leased from a third party.
 
(2) Owned by a partnership in which a Tenet subsidiary owns 50% and is the
    managing general partner and individual physicians own the remaining
    interests.
 
(3) Leased by a partnership in which Tenet's subsidiaries own a 75% interest.
 
(4) On leased land.
 
(5) Independently managed and being held for sale.
 
(6) Independently managed until French Hospital Medical Center is sold, at which
    time Valley Community Hospital will resume being managed by a Tenet
    subsidiary.
 
(7) Owned by a partnership in which Tenet's subsidiaries own a 94% interest and
    individual physicians own the remaining interests.
 
(8) Owned by a partnership in which Tenet's subsidiaries own an 95% interest and
    individual physicians own the remaining interests.
 
(9) Effective September 1, 1996, the 352 bed license of Golden Glades Medical
    Center was combined with the license of this nearby hospital resulting in
    this hospital's licensed beds increasing to 689 licensed beds.
 
(10) Owned by a partnership in which Tenet's subsidiaries own an 80% interest
    and individual physicians own the remaining interests.
 
(11) Owned by a partnership in which Tenet's subsidiaries own a 70% interest and
    individual physicians own the remaining interests.
 
(12) Excludes the 38-bed Plaza Specialty Hospital in Houston, Texas, the
    financial results of which are combined with Park Plaza Hospital.
 
(13) Owned by a partnership in which Tenet's subsidiaries own an 78% interest
    and individual physicians own the remaining interests.
 
(14) A Tenet subsidiary owns a 50% interest in the limited liability company
    that leases this hospital. This hospital's financial results are not
    consolidated with Tenet's financial results and it is not included in the
    count of the total number of hospitals owned or leased by Tenet because
    Tenet does not manage or control the management of this hospital.
 
(15) Owned by a limited liability company of which a Tenet subsidiary owns 95%
    and is the managing member.
 
(16) Excludes the 64-bed Keller Memorial Hospital in Columbia, Missouri, the
    financial results of which were combined with the Columbia Regional
    Hospital. The lease for Keller Memorial Hospital was terminated during the
    first quarter of fiscal 1996.
 
(17) Owned by a partnership in which Tenet's subsidiaries own a 70% interest.
 
(18) Owned by a limited liability company in which a Tenet subsidiary owns a 74%
    interest and is the managing member.
 
                                       15
<PAGE>
                              SELLING SHAREHOLDERS
 
    The following table sets forth information with respect to the number of
Shares owned by each of the Selling Shareholders and the number of Shares that
may be offered hereby by each Selling Shareholder. In connection with any
offering and sale of the Shares, the names of the Selling Shareholders
participating in such offering and the respective number of Shares being offered
by each Selling Shareholder will be set forth in an accompanying Prospectus
Supplement. The aggregate number of shares of Common Stock held by the Selling
Shareholders is 9,580,644. The Company has agreed to pay the fees and expenses
of registration, including the fees and expenses (not to exceed $50,000) for one
counsel on behalf of the Selling Shareholders, in connection with the sale of
the Shares offered hereby (other than underwriting discounts and commissions,
which will be paid by the Selling Shareholders).
 
<TABLE>
<CAPTION>
                                                                    NUMBER OF
                                                                  SHARES OWNED      NUMBER OF           NUMBER OF
                                                                    PRIOR TO         SHARES           SHARES OWNED
NAME                                                                OFFERING      BEING OFFERED    AFTER THE OFFERING
- ---------------------------------------------------------------  ---------------  -------------  -----------------------
<S>                                                              <C>              <C>            <C>
 
California Public Employees' Retirement System(1)..............      1,830,892       1,830,892                  0
New York State Common Retirement Fund(2).......................        812,797         812,797                  0
Pension Reserves Investment Management Board...................        732,385         732,385                  0
The Rockefeller Foundation.....................................        366,266         366,266                  0
State of Wisconsin Investment Board............................        366,266         366,266                  0
Virginia Retirement System.....................................        732,385         732,385                  0
Yale University................................................        366,266         366,266                  0
Oregon Public Employees' Retirement System.....................      1,098,505       1,098,505                  0
EES Distressed Securities Fund L.P.............................        183,059         183,059                  0
Montana Board of Investments...................................         18,261          18,261                  0
State Universities Retirement System...........................         54,932          54,932                  0
Orange County Employees Retirement System......................         73,193          73,193                  0
Public Employees' Retirement Association of Colorado(3)........      1,098,505       1,098,505                  0
JLL Associates, L.P.(4)........................................      1,846,932       1,846,932                  0
                                                                                                                -
                                                                 ---------------  -------------
Total..........................................................      9,580,644       9,580,644                  0
</TABLE>
 
- ------------------------
 
1.  Does not include approximately 4,080,012 shares of Common Stock owned as of
    the date hereof by California Public Employees' Retirement System in
    addition to the shares received in the distribution from JLL.
 
2.  Does not include approximately 2,731,000 shares of Common Stock owned as of
    the date hereof by the New York State Common Retirement Fund in addition to
    the shares received in the distribution from JLL.
 
3.  Does not include approximately 12,200 shares of Common Stock owned as of the
    date hereof by the Public Employees' Retirement Association of Colorado in
    addition to the shares received in the distribution from JLL.
 
4.  Peter A. Joseph and Paul S. Levy, the general partners of JLL Associates,
    L.P., the general partners of JLL, were members of the Company's Board of
    Directors from January 30, 1997 until April 9, 1997.
 
                                       16
<PAGE>
                              PLAN OF DISTRIBUTION
 
    The shares may be sold from time to time by the Selling Shareholders in
underwritten public offerings, in any one or more transactions (which may
involve block transactions) on the Exchanges, in the over-the-counter market, on
NASDAQ, on any exchange on which the Common Stock may then be listed or
otherwise in negotiated transactions, or a combination of such methods of sale,
at market prices prevailing at the time of sale or at negotiated prices. The
Selling Shareholders may effect such transactions by selling shares to or
through broker-dealers, and such broker-dealers may sell the shares as agent or
may purchase such shares as principal and resell them for their own account
pursuant to this Prospectus. Such broker-dealers may receive compensation in the
form of underwriting discounts, concessions or commissions from the Selling
Shareholders and/or purchasers of shares for whom they may act as agent (which
compensation may be in excess of customary commissions). To the extent required,
the names of any underwriter and applicable commissions or discounts and any
other required information with respect to any particular offer will be set
forth in an accompanying Prospectus Supplement.
 
    In connection with such sales, the Selling Shareholders and any
participating brokers or dealers may be deemed to be "underwriters" as defined
in the Securities Act, in which event all brokerage commissions or discounts and
other compensation received by such brokers or dealers may be deemed
underwriting compensation under the Securities Act. In addition, any of the
securities that qualify for sale pursuant to Rule 144 may be sold under Rule 144
rather than pursuant to this Prospectus.
 
                                 LEGAL MATTERS
 
    Certain legal matters with respect to the Shares offered hereby will be
passed upon for the Company by Scott M. Brown, Senior Vice President, Secretary
and General Counsel of the Company. As of March 31, 1997, Mr. Brown owned 2,794
shares of Common Stock and had outstanding options to purchase 201,634 shares of
Common Stock pursuant to Company benefit plans.
 
                                    EXPERTS
 
    The supplemental consolidated financial statements and the consolidated
financial statements and schedule of Tenet Healthcare Corporation as of May 31,
1996 and 1995, and for each of the years in the three-year period ended May 31,
1996, have been incorporated by reference herein and in the Registration
Statement in reliance upon the reports of KPMG Peat Marwick LLP, independent
certified public accountants, incorporated by reference herein, and upon the
authority of said firm as experts in accounting and auditing. The reports of
KPMG Peat Marwick LLP covering the supplemental consolidated financial
statements and the consolidated financial statements refer to a change in the
method of accounting for income taxes in 1994.
 
    The consolidated financial statements of OrNda HealthCorp at August 31, 1996
and 1995, and for each of the three years in the period ended August 31, 1996,
incorporated by reference in the Tenet Healthcare Corporation Current Report on
Form 8-K dated February 12, 1997 have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon and incorporated by
reference therein and incorporated herein by reference. Such consolidated
financial statements are incorporated herein by reference in reliance upon such
report given upon the authority of such firm as experts in accounting and
auditing.
 
                           FORWARD LOOKING STATEMENTS
 
    Prospective investors are cautioned that the statements in this Prospectus
and in documents incorporated by reference herein that are not descriptions of
historical facts constitute forward looking statements that are subject to risks
and uncertainties. The Company's actual results could differ materially from
those currently anticipated in these forward looking statements due to, among
other things, certain factors described in documents incorporated by reference
herein, including, without limitation, the Tenet 10-K.
 
                                       17
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS
SUPPLEMENT OR THE PROSPECTUS IN CONNECTION WITH THE OFFERING COVERED BY THIS
PROSPECTUS SUPPLEMENT. IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY, THE SELLING
SHAREHOLDERS OR THE UNDERWRITERS. THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS
DO NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, THE
COMMON STOCK IN ANY JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL
TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS
SUPPLEMENT OR THE PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS NOT BEEN ANY CHANGE IN THE
FACTS SET FORTH IN THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS OR IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
 
                              -------------------
 
                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
The Company...............................................................  S-2
Use of Proceeds...........................................................  S-2
Selling Shareholders......................................................  S-2
Underwriting..............................................................  S-4
Legal Matters.............................................................  S-5
</TABLE>
 
                                   PROSPECTUS
 
<TABLE>
<S>                                                                         <C>
Available Information.....................................................    2
Incorporation of Certain Documents by Reference...........................    2
Risk Factors..............................................................    3
The Company...............................................................    8
Use of Proceeds...........................................................    8
Business Strategy.........................................................    8
Business Description......................................................    9
Key Elements of Tenet's Strategy..........................................   10
Domestic Properties.......................................................   13
Selling Shareholders......................................................   16
Plan of Distribution......................................................   17
Legal Matters.............................................................   17
Experts...................................................................   17
Forward Looking Statements................................................   17
</TABLE>
 
                                6,635,207 SHARES
 
                                TENET HEALTHCARE
                                  CORPORATION
 
                                  COMMON STOCK
 
                       ----------------------------------
 
                             PROSPECTUS SUPPLEMENT
 
                       ----------------------------------
 
                              MERRILL LYNCH & CO.
                          DONALDSON, LUFKIN & JENRETTE
      SECURITIES CORPORATION
 
                              GOLDMAN, SACHS & CO.
 
                               J.P. MORGAN & CO.
 
                                 APRIL 17, 1997
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------


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