TETRA TECH INC
424B3, 2000-11-08
ENGINEERING SERVICES
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<PAGE>

PROSPECTUS




                                TETRA TECH, INC.

                         202,376 SHARES OF COMMON STOCK

                              --------------------

          The stockholders of Tetra Tech, Inc. listed herein are offering and
     selling 202,376 shares of Common Stock of Tetra Tech, Inc. under this
     prospectus.

                              --------------------


           INVESTING IN TETRA TECH, INC. COMMON STOCK INVOLVES RISKS.
                     SEE "RISK FACTORS" BEGINNING ON PAGE 2.

                              --------------------

        Certain of the selling stockholders obtained or will obtain their shares
of Common Stock in exchange for their Exchangeable Shares of Tetra Tech Canada
Ltd., a subsidiary of Tetra Tech, Inc. These selling stockholders obtained their
Exchangeable Shares on May 3, 2000 in connection with Tetra Tech Canada Ltd.'s
acquisition of 1261248 Ontario Inc. Certain of the selling stockholders obtained
their shares of Common Stock on May 17, 2000 in connection with Tetra Tech,
Inc.'s acquisition of FHC, Inc. The other selling stockholders obtained their
shares on May 24, 2000 in connection with Tetra Tech, Inc.'s acquisition of
Rizzo Associates, Inc. Some or all of the selling stockholders expect to sell
their shares.

        The selling stockholders may offer their shares of Common Stock through
public or private transactions, on or off the Nasdaq National Market, at
prevailing market prices, or at privately negotiated prices.

                              --------------------

        Tetra Tech, Inc. Common Stock is traded on the Nasdaq National Market
under the symbol "WATR." On November 6, 2000, the closing price of the Common
Stock on the Nasdaq National Market was $33.88 per share.

                              --------------------

      THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS
HAVE NOT APPROVED OR DISAPPROVED THESE SECURITIES, OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                              --------------------

                 THE DATE OF THIS PROSPECTUS IS NOVEMBER 7, 2000


<PAGE>


                                   THE COMPANY

        Tetra Tech, Inc. is a leading provider of specialized management
consulting and technical services in three principal business areas: resource
management, infrastructure and communications. As a specialized management
consultant, we assist our clients in defining problems and developing innovative
and cost-effective solutions. Our management consulting services are
complemented by our technical services. These technical services, which
implement solutions, include research and development, applied science,
engineering and architectural design, construction management, and operations
and maintenance. Our clients include a diverse base of public and private
organizations located in the United States and internationally.

        Since our initial public offering in December 1991, we have increased
the size and scope of our business and have expanded our service offerings
through a series of strategic acquisitions and internal growth. We have more
than 6,700 employees worldwide, 6,650 of whom are located in North America in
more than 150 locations. In addition, we have established a presence in Asia,
South America and Europe.

        Our principal executive offices are located at 670 North Rosemead
Boulevard, Pasadena, California 91107, and our telephone number is (626)
351-4664. Our website is located at www.tetratech.com. Information contained on
our website is not a part of this prospectus.

                                 USE OF PROCEEDS

        The selling stockholders are offering all of the shares of Common Stock
covered by this prospectus. We will not receive any proceeds from the sales of
these shares.


                                  RISK FACTORS

        AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED BY THIS PROSPECTUS
INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CAREFULLY REVIEW THE FOLLOWING RISK
FACTORS AS WELL AS THE OTHER INFORMATION SET FORTH IN THIS PROSPECTUS BEFORE
MAKING AN INVESTMENT.

        SOME OF THE INFORMATION IN THIS PROSPECTUS OR INCORPORATED BY REFERENCE
IN THIS PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE SUBSTANTIAL
RISKS AND UNCERTAINTIES. YOU CAN IDENTIFY THESE STATEMENTS BY FORWARD-LOOKING
WORDS SUCH AS "MAY," "WILL," "EXPECT," "ANTICIPATE," "BELIEVE," "ESTIMATE" AND
"CONTINUE" OR SIMILAR WORDS. YOU SHOULD READ STATEMENTS THAT CONTAIN THESE WORDS
CAREFULLY BECAUSE THEY: (1) DISCUSS OUR FUTURE EXPECTATIONS; (2) CONTAIN
PROJECTIONS OF OUR FUTURE OPERATING RESULTS OR OF OUR FUTURE FINANCIAL
CONDITION; OR (3) STATE OTHER "FORWARD-LOOKING" INFORMATION. WE BELIEVE IT IS
IMPORTANT TO COMMUNICATE OUR EXPECTATIONS TO OUR INVESTORS. THERE MAY BE EVENTS
IN THE FUTURE, HOWEVER, THAT WE ARE NOT ACCURATELY ABLE TO PREDICT OR OVER WHICH
WE HAVE NO CONTROL. THE RISK FACTORS LISTED IN THIS SECTION, AS WELL AS ANY
CAUTIONARY LANGUAGE IN THIS PROSPECTUS, PROVIDE EXAMPLES OF RISKS, UNCERTAINTIES
AND EVENTS THAT MAY CAUSE OUR ACTUAL RESULTS TO DIFFER MATERIALLY FROM THE
EXPECTATIONS WE DESCRIBE IN OUR FORWARD-LOOKING STATEMENTS. BEFORE YOU INVEST IN
OUR COMMON STOCK, YOU SHOULD BE AWARE THAT THE OCCURRENCE OF ANY OF THE EVENTS
DESCRIBED IN THESE RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS COULD HAVE A
MATERIAL ADVERSE EFFECT ON OUR BUSINESS, FINANCIAL CONDITION AND OPERATING
RESULTS AND THAT UPON THE OCCURRENCE OF ANY OF THESE EVENTS, THE TRADING PRICE
OF OUR COMMON STOCK COULD DECLINE AND YOU COULD LOSE ALL OR PART OF YOUR
INVESTMENT.

THERE ARE RISKS ASSOCIATED WITH OUR ACQUISITION STRATEGY THAT COULD ADVERSELY
IMPACT OUR BUSINESS AND OPERATING RESULTS

        A significant part of our growth strategy is to acquire other companies
that complement our lines of business or that broaden our geographic presence.
During fiscal 1999, we purchased eleven companies in nine separate transactions.
During the nine months ended July 2, 2000, we purchased eight companies in seven
transactions. We expect to continue to acquire companies as an element of our
growth strategy. Acquisitions involve certain risks that could cause our actual
growth or operating results to differ from our expectations or the expectations
of security analysts. For example:


                                        2

<PAGE>


     -    We may not be able to identify suitable acquisition candidates or to
          acquire additional companies on favorable terms;

     -    We compete with others to acquire companies. Competition may increase
          and may result in decreased availability or increased price for
          suitable acquisition candidates;

     -    We may not be able to obtain the necessary financing, on favorable
          terms or at all, to finance any of our potential acquisitions;

     -    We may ultimately fail to consummate an acquisition even if we
          announce that we plan to acquire a company;

     -    We may fail to successfully integrate or manage these acquired
          companies due to differences in business backgrounds or corporate
          cultures;

     -    These acquired companies may not perform as we expect;

     -    We may find it difficult to provide a consistent quality of service
          across our geographically diverse operations; and

     -    If we fail to successfully integrate any acquired company, our
          reputation could be damaged. This could make it more difficult to
          market our services or to acquire additional companies in the future.

In addition, our acquisition strategy may divert management's attention away
from our primary service offerings, result in the loss of key clients or
personnel and expose us to unanticipated liabilities.

        Finally, acquired companies that derive a significant portion of their
revenues from the Federal government and that do not follow the same cost
accounting policies and billing procedures as we do may be subject to larger
cost disallowances for greater periods than we typically encounter. If we fail
to determine the existence of unallowable costs and establish appropriate
reserves in advance of an acquisition we may be exposed to material
unanticipated liabilities, which could have a material adverse effect on our
business.

OUR QUARTERLY OPERATING RESULTS MAY FLUCTUATE SIGNIFICANTLY, WHICH COULD HAVE A
NEGATIVE EFFECT ON THE PRICE OF OUR COMMON STOCK

        Our quarterly revenues, expenses and operating results may fluctuate
significantly because of a number of factors, including:

     -    The seasonality of the spending cycle of our public sector clients,
          notably the Federal government;

     -    Employee hiring and utilization rates;

     -    The number and significance of client engagements commenced and
          completed during a quarter;

     -    Delays incurred in connection with an engagement;

     -    The ability of clients to terminate engagements without penalties;

     -    The size and scope of engagements;

     -    The timing of expenses incurred for corporate initiatives;

     -    The timing and size of the return on investment capital; and

     -    General economic and political conditions.


                                        3

<PAGE>


Variations in any of these factors could cause significant fluctuations in our
operating results from quarter to quarter and could result in net losses.

THE VALUE OF OUR COMMON STOCK COULD CONTINUE TO BE VOLATILE

        The trading price of our Common Stock has fluctuated widely. In
addition, in recent years the stock market has experienced extreme price and
volume fluctuations. The overall market and the price of our Common Stock may
continue to fluctuate greatly. The trading price of our Common Stock may be
significantly affected by various factors, including:

     -    Quarter to quarter variations in our operating results;

     -    Changes in environmental legislation;

     -    Changes in investors' and analysts' perception of the business risks
          and conditions of our business;

     -    Broader market fluctuations; and

     -    General economic or political conditions.

IF WE ARE NOT ABLE TO SUCCESSFULLY MANAGE OUR GROWTH STRATEGY, OUR BUSINESS
AND RESULTS OF OPERATIONS MAY BE ADVERSELY AFFECTED

        We are growing rapidly. Our growth presents numerous managerial,
administrative, operational and other challenges. Our ability to manage the
growth of our operations will require us to continue to improve our operational,
financial and human resource management information systems and our other
internal systems and controls. In addition, our growth will increase our need to
attract, develop, motivate and retain both our management and professional
employees. The inability of our management to manage our growth effectively or
the inability of our employees to achieve anticipated performance or utilization
levels, could have a material adverse effect on our business.

THE LOSS OF KEY PERSONNEL OR OUR INABILITY TO ATTRACT AND RETAIN QUALIFIED
PERSONNEL COULD SIGNIFICANTLY DISRUPT OUR BUSINESS

        We depend upon the efforts and skills of our executive officers, senior
managers and consultants. With limited exceptions, we do not have employment
agreements with any of these individuals. The loss of the services of any of
these key personnel could adversely affect our business. Although we have
obtained non-compete agreements from certain principals and stockholders of
companies we have acquired, we generally do not have non-compete or employment
agreements with key employees who were not once equity holders of these
companies. We do not maintain key-man life insurance policies on any of our
executive officers or senior managers.

        Our future growth and success depends on our ability to attract and
retain qualified scientists and engineers. The market for these professionals is
competitive and we may not be able to attract and retain such professionals.

CHANGES IN EXISTING LAWS AND REGULATIONS COULD REDUCE THE DEMAND FOR OUR
SERVICES

        A significant amount of our resource management business is generated
either directly or indirectly as a result of existing Federal and state
governmental laws, regulations and programs. Any changes in these laws or
regulations that reduce funding or affect the sponsorship of these programs
could reduce the demand for our services and could have a material adverse
effect on our business.


                                        4

<PAGE>


OUR REVENUES FROM AGENCIES OF THE FEDERAL GOVERNMENT ARE CONCENTRATED, AND A
REDUCTION IN SPENDING BY THESE AGENCIES COULD ADVERSELY AFFECT OUR BUSINESS AND
OPERATING RESULTS

        Agencies of the Federal government are among our most significant
clients. During the nine months ended July 2, 2000, approximately 28.9% of our
net revenue was derived from Federal agencies, of which 15.3% was derived from
the Department of Defense (DOD), 9.4% from the Environmental Protection Agency
(EPA), 2.2% from the Department of Energy (DOE), and 2.0% from various other
Federal government agencies. Some contracts with Federal government agencies
require annual funding approval and may be terminated at their discretion. A
reduction in spending by Federal government agencies could limit the continued
funding of our existing contracts with them and could limit our ability to
obtain additional contracts. These limitations, if significant, could have a
material adverse effect on our business.

OUR CONTRACTS WITH GOVERNMENTAL AGENCIES ARE SUBJECT TO AUDIT, WHICH COULD
RESULT IN THE DISALLOWANCE OF CERTAIN COSTS

        Contracts with the Federal government and other governmental agencies
are subject to audit. Most of these audits are conducted by the Defense Contract
Audit Agency (DCAA), which reviews our overhead rates, operating systems and
cost proposals. The DCAA may disallow costs if it determines that we accounted
for these costs incorrectly or in a manner inconsistent with Cost Accounting
Standards. A disallowance of costs by the DCAA, or other governmental auditors,
could have a material adverse effect on our business.

OUR BUSINESS AND OPERATING RESULTS COULD BE ADVERSELY AFFECTED BY LOSSES UNDER
FIXED-PRICE CONTRACTS OR TERMINATION OF CONTRACTS AT THE CLIENT'S DISCRETION

        We contract with Federal and state governments as well as with the
commercial sector. These contracts are often subject to termination at the
discretion of the client with or without cause. Additionally, we enter into
various types of contracts with our clients, including fixed-price contracts.
Fixed-price contracts protect clients and expose us to a number of risks. These
risks include underestimation of costs, problems with new technologies,
unforeseen costs or difficulties, delays beyond our control and economic and
other changes that may occur during the contract period. Losses under
fixed-price contracts or termination of contracts at the discretion of the
client could have a material adverse effect on our business.

        In fiscal 1999, we had a contract change with Tele-Communications, Inc.
(currently known as AT&T Broadband) involving three turnkey contracts. This
change was due in part to Tele-Communications, Inc.'s change in strategy from
turnkey contracts to direct service contracts in the upgrading of its network
systems.

OUR INABILITY TO FIND QUALIFIED SUBCONTRACTORS COULD ADVERSELY AFFECT THE
QUALITY OF OUR SERVICE AND OUR ABILITY TO PERFORM UNDER CERTAIN CONTRACTS

        Under some of our contracts, we depend on the efforts and skills of
subcontractors for the performance of certain tasks. Reliance on subcontractors
varies from project to project. In the nine months ended July 2, 2000,
subcontractor costs comprised 23.0% of our gross revenue. The absence of
qualified subcontractors with whom we have a satisfactory relationship could
adversely affect the quality of our service and our ability to perform under
some of our contracts.

OUR INDUSTRY IS HIGHLY COMPETITIVE AND WE MAY BE UNABLE TO COMPETE EFFECTIVELY

        We provide specialized management consulting and technical services to a
broad range of public and private sector clients. The market for our services is
highly competitive and we compete with many other firms. These firms range from
small regional firms to large national firms which have greater financial and
marketing resources than ours.

        We focus primarily on the resource management, infrastructure and
communications business areas. We provide services to our clients which include
Federal, state and local agencies, and organizations in the private sector.


                                        5

<PAGE>


        We compete for projects and engagements with a number of competitors
which can vary from 10 to 100 firms. Historically, clients have chosen among
competing firms based on the quality and timeliness of the firm's service. We
believe, however, that price has become an increasingly important factor.

        We believe that our principal competitors include, in alphabetical
order, Black & Veatch LLP; Brown & Caldwell; Castle Tower Corporation; Camp,
Dresser & McKee; CH2M Hill Companies Ltd.; EA Engineering, Science & Technology,
Inc.; Earth Tech, Inc.; ICF Kaiser International, Inc.; IT Group Inc.; Mastec,
Inc.; Montgomery Watson; o2 Wireless Solutions, Inc.; Quanta Services; Roy F.
Weston, Inc.; URS Greiner Corporation and Wireless Facilities, Inc.

OUR SERVICES EXPOSE US TO SIGNIFICANT RISKS OF LIABILITY AND OUR INSURANCE
POLICIES MAY NOT PROVIDE ADEQUATE COVERAGE

        Our services involve significant risks of professional and other
liabilities which may substantially exceed the fees we derive from our services.
Our business activities could expose us to potential liability under various
environmental laws such as the Comprehensive Environmental Response,
Compensation and Liability Act of 1980 (CERCLA). In addition, we sometimes
contractually assume liability under indemnification agreements. We cannot
predict the magnitude of such potential liabilities.

        We currently maintain comprehensive general liability, umbrella and
professional liability insurance policies. We believe that our insurance
policies are adequate for our business operations. Professional liability
policies are "claims made" policies. Thus, only claims made during the term of
the policy are covered. Should we terminate our professional liability policy
and not obtain retroactive coverage, we would be uninsured for claims made after
termination even if these claims are based on events or acts that occurred
during the term of the policy. Additionally, our insurance policies may not
protect us against potential liability due to various exclusions and retentions.
In addition, if we expand into new markets, we may not be able to obtain
insurance coverage for such activities or, if insurance is obtained, the dollar
amount of any liabilities incurred could exceed our insurance coverage.
Partially or completely uninsured claims, if successful and of significant
magnitude, could have a material adverse affect on our business.

WE MAY BE PRECLUDED FROM PROVIDING CERTAIN SERVICES DUE TO CONFLICT OF INTEREST
ISSUES

        Many of our clients are concerned about potential or actual conflicts of
interest in retaining management consultants. Federal government agencies have
formal policies against continuing or awarding contracts that would create
actual or potential conflicts of interest with other activities of a contractor.
These policies, among other things, may prevent us from bidding for or
performing contracts resulting from or relating to certain work we have
performed for the government. In addition, services performed for a private
client may create a conflict of interest that precludes or limits our ability to
obtain work from other public or private organizations. We have, on occasion,
declined to bid on projects because of these conflicts of interest issues.

OUR INTERNATIONAL OPERATIONS EXPOSE US TO RISKS SUCH AS FOREIGN CURRENCY
FLUCTUATIONS

        In the nine months ended July 2, 2000, approximately 2.8% of our net
revenue was derived from the international marketplace. Some contracts with our
international clients are denominated in foreign currencies. As such, these
contracts contain inherent risks including foreign currency exchange risk and
the risk associated with expatriating funds from foreign countries. If our
international revenue increases, our exposure to foreign currency fluctuations
will also increase. We periodically enter into forward exchange contracts to
address certain foreign currency fluctuations.


                                        6

<PAGE>


                              SELLING STOCKHOLDERS

        On May 3, 2000, we acquired, through our subsidiary, Tetra Tech Canada
Ltd. ("TTC"), 1261248 Ontario Inc., an Ontario corporation ("ENG"), pursuant to
the terms of a stock purchase agreement dated May 3, 2000 among Tetra Tech, TTC,
ENG, and the ENG shareholders (the "ENG Acquisition"). In connection with the
ENG acquisition, we issued to the ENG shareholders an aggregate of 33,606
Exchangeable Shares of TTC. The ENG shareholders may exchange their Exchangeable
Shares for 33,606 shares of our Common Stock on and after October 3, 2000.

        On May 17, 2000, we acquired FHC, Inc., an Oklahoma corporation ("FHC"),
pursuant to the terms of a stock purchase agreement dated May 17, 2000 among
Tetra Tech and the FHC shareholders (the "FHC Acquisition"). In connection with
the FHC Acquisition, we issued to the FHC shareholders an aggregate of 56,334
shares of our Common Stock.

        On May 24, 2000, we acquired Rizzo Associates, Inc., a Massachusetts
corporation ("RAI"), pursuant to the terms of a stock purchase agreement dated
May 24, 2000 among Tetra Tech and the RAI shareholders (the "RAI Acquisition").
In connection with the RAI Acquisition, we issued to the RAI shareholders an
aggregate of 112,436 shares of our Common Stock.

        Under a Registration Rights Agreement dated May 3, 2000 as to the ENG
Acquisition, a Registration Rights Agreement dated May 17, 2000 as to the FHC
Acquisition and a Registration Rights Agreement dated May 24, 2000 as to the RAI
Acquisition, we agreed to register the shares of Common Stock issuable upon the
election to exchange the Exchangeable Shares issued to the former shareholders
of ENG, register the shares of Common Stock issued to the former FHC and RAI
shareholders, and to use commercially reasonable efforts to keep the
registration statement effective until the date on which all selling
stockholders may sell their shares of Common Stock under Rule 144 promulgated
under the Securities Act of 1933, as amended (the "Securities Act"), without any
volume limitation. Our registration of the shares of Common Stock does not
necessarily mean that the selling stockholders will sell all or any of the
shares.

        The shares listed below represent all of the shares that each selling
stockholder currently owns of our Common Stock. Except as otherwise noted, we
know of no agreements among our stockholders which relate to voting or
investment power over our Common Stock. Except as otherwise noted, the address
of each of the first two stockholders is c/o ENG Communications, 250 Consumers
Road, Suite 616, Toronto, Ontario, Canada; the address of next three selling
stockholders is c/o FHC, Inc., 5416 South Yale Avenue, Tulsa, Oklahoma 74135;
and the address of each of the other selling stockholders is c/o Rizzo
Associates, Inc., One Grant Street, Framingham, Massachusetts 01701.


                                        7

<PAGE>


<TABLE>
<CAPTION>
                                                                                 SHARES
                                                                               BENEFICIALL            NUMBER OF
                                                                               OWNED PRIOR             SHARES
                                   NAMES                                       TO OFFERING    %        OFFERED
----------------------------------------------------------------------------   -----------   ------   ---------
<S>                                                                            <C>           <C>      <C>
Emanuele Di Lecce (1).......................................................        18,303        *      18,303
Brenda Di Lecce (1).........................................................        15,303        *      15,303
Anthony R. Dark (2).........................................................        18,778        *      18,778
Barry L. Burks (2)..........................................................        18,778        *      18,778
Jon D. Nelson (2)...........................................................        18,778        *      18,778
William J. Rizzo (3)........................................................        48,709        *      48,709
James F. Carlin ............................................................        22,578        *      22,578
Richard A. Moore (3)........................................................         9,203        *       9,203
Elizabeth K. Levin (3)......................................................         8,700        *       8,700
Samuel E. Park .............................................................         8,342        *       8,342
Richard J. Hughto (3).......................................................         6,850        *       6,850
Charles Button (3)..........................................................         1,429        *       1,429
John E. Adams (3)...........................................................         1,305        *       1,305
Harold E. Fitzgerald (3)....................................................         1,148        *       1,148
Raymond C. Johnson (3)......................................................           860        *         860
Brian P. Sullivan (3).......................................................           845        *         845
Richard S. Bryant (3).......................................................           373        *         373
Kelly M. Amrhein (3)........................................................           181        *         181
Wayne E. Bates (3)..........................................................           221        *         221
Daniel D. Breuer (3)........................................................           214        *         214
Robert J. Davis ............................................................           213        *         213
Edward W. Ionata (3)........................................................           209        *         209
Amy M. Green (3)............................................................           206        *         206
Michael E. Billa (3)........................................................           169        *         169
Francis X. Dougherty (3)....................................................           166        *         166
George G. Gurney (3)........................................................           163        *         163
Anthony Omobono (3).........................................................           160        *         160
Joseph E. Beggan (3)........................................................            48        *          48
Domenic J. Ciavarro (3).....................................................            48        *          48
Colleen P. Hansen (3).......................................................            48        *          48
Kevin F. Biernacki (3)......................................................            48        *          48

</TABLE>

--------------

*        Represents less than 1% of the outstanding shares of Common Stock.

        (1) Employees of 1261248 Ontario Inc.
        (2) Employees of FHC, Inc.
        (3) Employees of Rizzo Associates, Inc.


                                        8

<PAGE>


        No stockholder has had any material relationship with us, or any of our
predecessors or affiliates, other than as an employee. Because the selling
stockholders may sell all or part of their shares of Common Stock offered
hereby, no estimate can be given as to the number of shares of Common Stock that
will be held by any selling stockholder upon termination of any offering made
hereby.

                              PLAN OF DISTRIBUTION

        We are registering the shares of Common Stock on behalf of the selling
stockholders. As used herein, "selling stockholders" includes donees and
pledgees selling shares received from a named selling shareholder after the date
of this Prospectus. This Prospectus may also be used by transferees of the
selling stockholders or by other persons acquiring shares, including brokers who
borrow the shares to settle short sales of shares of Common Stock. We will bear
all costs, expenses and fees in connection with the registration of the shares
offered hereby. The selling stockholders will bear brokerage commissions and any
similar selling expenses associated with the sale of shares.

        The selling stockholders may offer their shares of Common Stock at
various times in one or more of the following transactions:

     -    on the Nasdaq National Market;

     -    in the over-the-counter market;

     -    in transactions other than on the Nasdaq National Market or in the
          over-the-counter market;

     -    in connection with short sales of the shares of Common Stock;

     -    by pledge to secure debts and other obligations;

     -    in connection with the writing of non-traded and exchange-traded call
          options, in hedge transactions and in settlement of other transactions
          in standardized or over-the-counter options; or

     -    in any combination of any of the above transactions.

        In connection with hedging transactions, broker-dealers or other
financial institutions may engage in short sales of the Common Stock in the
course of hedging the positions they assume with selling stockholders. The
selling stockholders may also enter into options or other transactions with
broker-dealers or other financial institutions, which require the delivery to
such broker-dealer or other financial institution of the shares offered hereby,
which shares may be resold pursuant to this prospectus (as supplemented or
amended to reflect such transaction).

        The selling stockholders may sell their shares at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices, at negotiated prices or at fixed prices. The selling shareholders may
use broker-dealers to sell their shares. If this happens, broker-dealers will
either receive discounts or commissions from purchasers of shares for whom they
acted as agents.

        The selling stockholders have advised us that they have not entered into
any agreements, understandings or arrangements with any underwriters or
broker-dealers regarding the sale of their securities, nor is there an
underwriter or coordinating broker acting in connection with the proposed sale
of shares by the selling stockholders.


                                        9

<PAGE>


        The selling stockholders and any broker-dealers that act in connection
with the sale of shares might be deemed to be "underwriters" within the meaning
of Section 2(11) of the Securities Act, and any commissions received by such
broker-dealers and any profit on the resale of the shares sold by them while
acting as principals might be deemed to be underwriting discounts or commissions
under the Securities Act. We have agreed to indemnify each selling stockholder
against certain liabilities, including liabilities arising under the Securities
Act. The selling stockholders may agree to indemnify any agent, dealer or
broker-dealer that participates in transactions involving sales of the shares
against certain liabilities, including liabilities arising under the Securities
Act.

        Because the selling stockholders may be deemed to be "underwriters"
within the meaning of Section 2(11) of the Securities Act, the selling
stockholders will be subject to the prospectus delivery requirements of the
Securities Act. We have informed the selling stockholders that the
anti-manipulative provisions of Regulation M promulgated under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), may apply to their sales
in the market.

        The selling stockholders also may resell all or a portion of the shares
in open market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conform to the requirements of such Rule.

        Upon being notified by a selling stockholder that any material
arrangement has been entered into with a broker-dealer for the sale of shares
through a block trade, special offering, exchange distribution or secondary
distribution or a purchase by a broker or dealer, we will file a supplement to
this Prospectus, if required, pursuant to Rule 424(b) under the Securities Act,
disclosing (i) the name of each such selling stockholder and of the
participating broker-dealer(s), (ii) the number of shares involved, (iii) the
price at which such shares were sold, (iv) the commissions paid or discounts or
concessions allowed to such broker-dealer(s), where applicable, and (v) other
facts material to the transaction. In addition, upon being notified by a selling
stockholder that a donee or pledgee intends to sell more than 500 shares, we
will file a supplement to this Prospectus.

                       WHERE YOU CAN FIND MORE INFORMATION

        We file annual, quarterly and special reports, proxy statements and
other information with the Securities and Exchange Commission (SEC). You may
read and copy any document we file at the SEC's public reference room at 450
Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC at
1-800-SEC-0330 for further information on the public reference room. Our SEC
filings are also available to the public from the SEC's Website at
"http://www.sec.gov."

        The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and information that we file later
with the SEC will automatically update and supersede this information. We
incorporate by reference the documents listed below and any future filings we
will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange
Act:

     1.   Annual Report on Form 10-K for the fiscal year ended October 3, 1999,
          as filed with the SEC on December 30, 1999;

     2.   Definitive Proxy Statement as filed with the SEC on December 30, 1999,
          for the 2000 Annual Meeting of Stockholders;

     3.   Quarterly Report on Form 10-Q for the quarter ended January 2, 2000,
          as filed with the SEC on February 16, 2000;


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<PAGE>


     4.   Quarterly Report on Form 10-Q for the quarter ended April 2,
          2000, as filed with the SEC on May 17, 2000;

     5.   Quarterly Report on Form 10-Q for the quarter ended July 2, 2000,
          as filed with the SEC on August 16, 2000; and

     6.   The description of the Common Stock set forth in the Registration
          Statement on Form 8-A dated November 13, 1991, including any
          amendments or reports filed for the purpose of updating such
          description.

     You may request a copy of these filings, at no cost, by writing or
telephoning James M. Jaska as follows:

                          Tetra Tech, Inc.
                          Attention: Investor Relations
                          670 North Rosemead Boulevard
                          Pasadena, California 91107
                          (626) 351-4664

        This prospectus is part of a registration statement we filed with the
SEC. You should rely only on the information or representations provided in this
prospectus. We have authorized no one to provide you with different information.
We are not making an offer of these securities in any state where the offer is
not permitted. You should not assume that the information in this prospectus is
accurate as of any date other than the date on the front of the document.

                                  LEGAL MATTERS

        The validity of the Common Stock offered hereby will be passed on for us
by Riordan & McKinzie, a Professional Corporation, Los Angeles, California.
Certain principals of Riordan & McKinzie own shares of Common Stock.

                                     EXPERTS

The financial statements and the related financial statement schedule
incorporated in this prospectus by reference from our Annual Report on Form 10-K
for the year ended October 3, 1999 have been audited by Deloitte & Touche LLP,
independent auditors, as stated in their reports, which are incorporated herein
by reference, and have been so incorporated in reliance upon the reports of such
firm given upon their authority as experts in accounting and auditing.


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