UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR


   CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number 811-4757

                        Smith Barney Sector Series Inc.
               (Exact name of registrant as specified in charter)

                      125 Broad Street, New York, NY 10004
              (Address of principal executive offices) (Zip code)

                            Robert I. Frenkel, Esq.
                        Smith Barney Fund Management LLC
                            300 First Stamford Place
                               Stamford, CT 06902
                    (Name and address of agent for service)

       Registrant's telephone number, including area code: (800) 451-2010

                      Date of fiscal year end: October 31
                    Date of reporting period: April 30, 2004



ITEM 1.  REPORT TO STOCKHOLDERS.

         The Semi-Annual Report to Stockholders is filed herewith.


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                                  SMITH BARNEY
                               SECTOR SERIES INC.

                                  SMITH BARNEY
                                 TECHNOLOGY FUND

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              RESEARCH SERIES | SEMI-ANNUAL REPORT | APRIL 30, 2004










                        [LOGO] SMITH BARNEY MUTUAL FUNDS
                 YOUR SERIOUS MONEY. PROFESSIONALLY MANAGED.(R)

 YOUR SERIOUS MONEY. PROFESSIONALLY MANAGED.(R) is a registered service mark of
                         Citigroup Global Markets Inc.


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             NOT FDIC INSURED o NOT BANK GUARANTEED o MAY LOSE VALUE
- --------------------------------------------------------------------------------





[Graphic] Research Series


Semi-Annual Report  o  April 30, 2004

SMITH BARNEY
TECHNOLOGY FUND

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

WHAT'S INSIDE

LETTER FROM THE CHAIRMAN ..................................................    1
SCHEDULE OF INVESTMENTS ...................................................    4
STATEMENT OF ASSETS AND LIABILITIES .......................................    6
STATEMENT OF OPERATIONS ...................................................    7
STATEMENTS OF CHANGES IN NET ASSETS .......................................    8
NOTES TO FINANCIAL STATEMENTS .............................................    9
FINANCIAL HIGHLIGHTS ......................................................   14


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SMITH BARNEY FUND MANAGEMENT LLC
- --------------------------------------------------------------------------------
Smith Barney Fund Management LLC is the investment manager to the fund.
Citigroup Asset Management Ltd. is the subadviser. The fund's management team
follows a systematic and rigorous approach designed to provide appropriate
exposure to the market sector.


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FUND OBJECTIVE*
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The fund seeks long-term capital appreciation by investing primarily in common
stocks. The fund invests at least 80% of its assets in securities of companies
principally engaged in offering, using or developing products, processes or
services that will provide or will benefit significantly from technological
advances and improvements.


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FUND FACTS
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FUND INCEPTION
- --------------------------------------------------------------------------------
February 28, 2000







* Since the fund focuses its investments on companies involved in the technology
  industries, an investment in the fund may involve a greater degree of risk
  than an investment in other mutual funds with greater diversification.



- --------------------------------------------------------------------------------
                            LETTER FROM THE CHAIRMAN
- --------------------------------------------------------------------------------

                                                               [PHOTO]

                                                         R. JAY GERKEN, CFA
                                                         CHAIRMAN, PRESIDENT AND
                                                         CHIEF EXECUTIVE OFFICER

DEAR SHAREHOLDER,

Over the six month period ended April 30, 2004, most broad U.S. stock and bond
market indexes posted moderate gains. Stocks generally continued to outpace
bonds, with large-capitalization stocks typically outperforming small- and
mid-cap stocks and international stock markets generally outperforming the
domestic stock market. The economic environment was dominated by uncertainty
surrounding the sustainability of the domestic economic recovery, a continued
focus on new job growth and a geopolitical environment centering on news from
Iraq and new acts of terrorism.

Since the start of 2004, markets have been in a holding pattern -- volatility
declined and returns were relatively muted. Equity markets seem to have priced
in prospects of continued economic recovery and, in general, they were not
disappointed. Both bond market and stock market participants were a bit unnerved
by prospects for U.S. Federal Reserve Board ("Fed") tightening of key interest
rates at some unknown future date, the continuing turmoil in Iraq, and the March
2004 bombings in Spain. Each of these elements had a negative influence on the
stock market. Despite these concerns, however,

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

                              PERFORMANCE SNAPSHOT
                              AS OF APRIL 30, 2004
                            (EXCLUDING SALES CHARGES)

- --------------------------------------------------------------------------------
                                                                     6 MONTHS
- --------------------------------------------------------------------------------
Class A Shares                                                        -3.32%
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Russell 3000 Index                                                     6.14%
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Goldman Sachs Technology Index                                        -3.58%
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Lipper Science & Technology Funds Category Average                    -4.43%
- --------------------------------------------------------------------------------

THE PERFORMANCE SHOWN REPRESENTS PAST PERFORMANCE. PAST PERFORMANCE IS NO
GUARANTEE OF FUTURE RESULTS AND CURRENT PERFORMANCE MAY BE HIGHER OR LOWER THAN
THE PERFORMANCE SHOWN ABOVE. PERFORMANCE FIGURES MAY REFLECT FEE WAIVERS AND/OR
EXPENSE REIMBURSEMENTS, IF ANY. IN THE ABSENCE OF FEE WAIVERS AND/OR EXPENSE
REIMBURSEMENTS, IF ANY, THE TOTAL RETURN WOULD BE REDUCED. PRINCIPAL VALUE AND
INVESTMENT RETURNS WILL FLUCTUATE AND INVESTORS' SHARES, WHEN REDEEMED, MAY BE
WORTH MORE OR LESS THAN THEIR ORIGINAL COST. TO OBTAIN PERFORMANCE DATA CURRENT
TO THE MOST RECENT MONTH-END, PLEASE VISIT OUR WEBSITE AT
WWW.SMITHBARNEYMUTUALFUNDS.COM.

CLASS A SHARE RETURNS ASSUME THE REINVESTMENT OF INCOME DIVIDENDS AND CAPITAL
GAINS DISTRIBUTIONS AT NET ASSET VALUE AND THE DEDUCTION OF ALL FUND EXPENSES.
RETURNS HAVE NOT BEEN ADJUSTED TO INCLUDE SALES CHARGES THAT MAY APPLY WHEN
SHARES ARE PURCHASED OR THE DEDUCTION OF TAXES THAT A SHAREHOLDER WOULD PAY ON
FUND DISTRIBUTIONS. EXCLUDING SALES CHARGES, CLASS B SHARES RETURNED -3.67% AND
CLASS C SHARES RETURNED -3.93% OVER THE SIX MONTHS ENDED APRIL 30, 2004.

Effective April 29, 2004, Smith Barney Class L shares were renamed Class C
shares. On February 2, 2004, initial sales charges on these shares were
eliminated.

All index performance reflects no deduction for fees, expenses or taxes. The
Russell 3000 Index measures the performance of the 3,000 largest U.S. companies
based on total market capitalization, which represent approximately 98% of U.S.
equity market. The Goldman Sachs Technology Index is a broad-based measure of
U.S.-traded technology stocks. The Index is comprised of six sub-indices --
hardware, computer software, services, semiconductors, Internet and multimedia
networking.

Lipper, Inc. is a major independent  mutual-fund tracking organization.  Returns
are based on the six-month  period ending April 30, 2004,  calculated  among the
321 funds in the fund's Lipper category  including the reinvestment of dividends
and capital  gains,  if any, and excluding  sales  charges.

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        1   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




the underlying economic and financial fundamentals continued to improve through
the end of the period.

So far this year, the economy overall has appeared to be growing at a pace
similar to last year's rate. The ongoing recovery has been broad-based, with
strength in the consumer sector, exports and business investments. Soaring
corporate profit growth has led to vastly improved balance-sheet fundamentals in
general, while highly stimulative monetary and fiscal policy continued to
provide support, although the stimulative effects of fiscal policy could wane
after tax-refund season ends this spring. Following a period of mixed employment
news through the end of last year, job growth picked up substantially in the
first calendar quarter of 2004.

Signs of increasing inflation have begun to mount in recent weeks. Fiscal and
monetary policymakers have been stimulating the economy since 2000. The Fed has
more or less said it prefers inflation to deflation in the current environment.
However, we believe the recent pick-up in inflationary signals has increased the
possibility that the Fed may raise interest rates sooner than anticipated,
perhaps as early as this summer. Accordingly, the recent debate in the market
has focused on the timing and magnitude of prospective rate increases.

PERFORMANCE REVIEW

Within this environment, the fund performed as follows: For the six months ended
April 30, 2004, Class A shares of the Smith Barney Technology Fund, excluding
sales charges, returned -3.32%. In comparison, the fund's unmanaged benchmarks,
the Russell 3000 Index(i) returned 6.14%, and the Goldman Sachs Technology Index
("GSTechnology Index")(ii) returned -3.58% for the same period. The fund's
Lipper science & technology funds category average returned -4.43% for the same
period.(1)

The technology market moved upwards though November and December to end 2003 on
a high note. The positive momentum continued into January, before falling
through February, March, and April. The best performing sub-sectors were
wireless equipment, IT services and internet, while semiconductors lagged.
Telecom equipment stocks started 2004 well, as Ericsson and Andrew Corp. posted
positive earnings results, and Verizon made constructive comments on their
investment plans. However, it was not all positive news in the sector as NOKIA
OYJ issued a profits warning as a result of losing market share and Nortel fired
its CEO amid an accounting scandal. The semiconductor sub-sector also performed
poorly, despite continued strong fundamentals. Semiconductor industry revenue
was up more than 20% versus the previous year for each month of the period, but
investors were becoming concerned that the growth rate could soon decelerate and
have been cautious about high levels of inventory. Internet stalwarts Yahoo and
EBAY INC. continued to power upwards, based on strong operating performance, and
investor interest returned to the IT services sector, where data processing
companies such as AUTOMATIC DATA PROCESSING, INC. and FIRST DATA CORP. had
decent returns.

FUND PERFORMANCE

Although the fund's performance for the period was negative, it slightly
outperformed its secondary benchmark, the GSTechnology Index. Positive
performance was driven through positive stock selection within the software
sub-sector, as well as by an underweight in semiconductors. The fund maintained
a negative bias in semiconductors, which worked in our favor, and the holdings
the fund did own, such as NVIDIA CORPORATION held up well. In software, fund
holdings in AMDOCS LTD. and COMPUTER ASSOCIATES INTERNATIONAL, INC. performed
well, as they continued to demonstrate strong operational performance with
strong cash generation. Stock selection was mixed in computer hardware, where
the fund was negatively affected by its ownership of SANMINA-SCI CORPORATION and
SUN MICROSYSTEMS, INC. This was offset by fund holdings in APPLE COMPUTER, INC.,
which saw strong momentum from sales of its IPOD, and from LEXMARK, which was
gaining market share in printers. In communications equipment, the fund also
benefited from owning AVAYA INC. and MOTOROLA, INC., where restructuring efforts
are bearing fruit. On the negative side, the fund's holding in Nokia hurt
performance, which had poor results as it struggled with declining prices and
market share loss for handsets.

(1)  Lipper, Inc. is a major independent mutual-fund tracking organization.
     Returns are based on the six-month period ended April 30, 2004, calculated
     among the 321 funds in the fund's Lipper category including the
     reinvestment of dividends and capital gains, if any, and excluding sales
     charges.


        2   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




SPECIAL SHAREHOLDER NOTICE

Effective April 29, 2004, Smith Barney Sector Series on behalf of the Smith
Barney Technology Fund changed its primary performance benchmark from the
Goldman Sachs Technology Index to the Russell 3000 Index. The Goldman Sachs
Technology Index will continue as a secondary performance benchmark.

Effective April 29, 2004, Smith Barney Class L shares were renamed Class C
shares. On February 2, 2004, initial sales charges on these shares were
eliminated.

INFORMATION ABOUT YOUR FUND

In recent months several issues in the mutual fund industry have come under the
scrutiny of federal and state regulators. The fund's Adviser and some of its
affiliates have received requests for information from various government
regulators regarding market timing, late trading, fees and other mutual fund
issues in connection with various investigations. The regulators appear to be
examining, among other things, the fund's response to market timing and
shareholder exchange activity, including compliance with prospectus disclosure
related to these subjects. The fund has been informed that the Adviser and its
affiliates are responding to those information requests, but are not in a
position to predict the outcome of these requests and investigations.

As always, thank you for your confidence in our stewardship of your assets. We
look forward to helping you continue to meet your financial goals.

Sincerely,

/s/ R. Jay Gerken

R. Jay Gerken, CFA
Chairman, President and Chief Executive Officer

MAY 18, 2004


The information provided is not intended to be a forecast of future events, a
guarantee of future results or investment advice. Views expressed may differ
from those of the firm as a whole.

Portfolio holdings and breakdowns are as of April 30, 2004 and are subject to
change and may not be representative of the portfolio manager's current or
future investments. The fund's top ten holdings as of this date were: Microsoft
Corp. (10.9%), Intel Corp. (10.7%), Cisco Systems Inc. (7.6%), Hewlett-Packard
Co. (5.2%), International Business Machines Corp. (5.0%), Computer Associates
International Inc. (3.8%), Oracle Corp. (3.4%), EMC Corp. (3.3%), Amdocs Ltd.
(3.2%) and Lexmark International Inc. (3.1%). Please refer to pages 4 through 5
for a list and percentage breakdown of the fund's holdings.

The mention of sector breakdowns is for  informational  purposes only and should
not be construed as a  recommendation  to purchase or sell any  securities.  The
information provided regarding such sectors is not a sufficient basis upon which
to make an investment decision. Investors seeking financial advice regarding the
appropriateness  of  investing  in  any  securities  or  investment   strategies
discussed should consult their financial  professional.  Portfolio  holdings are
subject  to change at any time and may not be  representative  of the  portfolio
manager's current or future investments.  The fund's top five sector holdings as
of April 30,  2004  were:  Software  (25.9%);  Computer &  Peripherals  (24.9%);
Semiconductor  Equipment & Products (17.1%);  Communications  Equipment (15.6%);
Internet Catalog Retail (4.9%).  The fund's portfolio  composition is subject to
change at any time.

RISKS: In addition to normal risks  associated with equity  investing,  narrowly
focused investments  typically exhibit higher volatility.  The technology sector
may be subject to greater  governmental  regulation,  competitive  pressures and
rapid technological change and obsolescence, which may have a materially adverse
effect on the sector. Additionally, the fund's performance will be influenced by
political,  social and economic  factors  affecting  investments in companies in
foreign  countries  not  associated  with  domestic  investing  These  risks are
magnified in emerging markets.  The securities of small- and mid-sized companies
tend to be more  volatile  than  those  of  larger  companies.  The fund may use
derivatives,   such  as  options  and  futures,   which  can  be  illiquid,  may
disproportionately  increase losses, and have a potentially large impact on fund
performance.

All index performance reflects no deduction for fees, expenses or taxes. Please
note that an investor cannot invest directly in an index.

(i)  The Russell 3000 Index measures the performance of the 3,000 largest U.S.
     companies based on total market capitalization, which represent
     approximately 98% of U.S. equity market.

(ii) The Goldman Sachs Technology Index is a broad-based measure of U.S.-traded
     technology stocks. The Index is comprised of six sub-indices -- hardware,
     computer software, services, semiconductors, Internet and multimedia
     networking.


        3   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report



================================================================================
SCHEDULE OF INVESTMENTS (UNAUDITED)                               APRIL 30, 2004
================================================================================

SHARES                             SECURITY                            VALUE
================================================================================
COMMON STOCK -- 100.0%
CONSUMER DISCRETIONARY -- 7.1%
INTERNET & CATALOG RETAIL -- 4.8%
         29,181     eBay Inc.*                                       $ 2,329,227
         62,090     InterActiveCorp*                                   1,978,808
- --------------------------------------------------------------------------------
                                                                       4,308,035
- --------------------------------------------------------------------------------
SPECIALTY RETAIL -- 2.3%
         32,185     CDW Corp.                                          2,011,241
- --------------------------------------------------------------------------------
                    TOTAL CONSUMER DISCRETIONARY                      6,319,276
================================================================================
INDUSTRIALS -- 3.5%
COMMERCIAL SERVICES & SUPPLIES -- 3.5%
         24,757     Automatic Data Processing, Inc.                   1,084,604
         21,512     DST Systems, Inc.*                                  949,755
         23,088     First Data Corp.                                  1,047,964
- --------------------------------------------------------------------------------
                    TOTAL INDUSTRIALS                                 3,082,323
================================================================================
INFORMATION TECHNOLOGY -- 89.4%
COMMUNICATIONS EQUIPMENT -- 15.6%
        322,048     Cisco Systems, Inc.*                              6,721,142
        115,380     Comverse Technology, Inc.*                        1,887,617
        109,466     Motorola, Inc.                                    1,997,755
        141,222     Nokia Oyj, Sponsored ADR                          1,978,520
         20,146     QUALCOMM Inc.                                     1,258,319
- --------------------------------------------------------------------------------
                                                                     13,843,353
- --------------------------------------------------------------------------------
COMPUTERS & PERIPHERALS -- 24.9%
        106,821     Apple Computer, Inc.*                             2,748,504
         30,043     Dell Inc.*                                        1,042,793
        261,258     EMC Corp.*                                        2,915,639
        234,583     Hewlett-Packard Co.                               4,621,285
         50,331     International Business Machines Corp.             4,437,684
         30,646     Lexmark International, Inc.*                      2,772,237
         99,379     NVIDIA Corp.*                                     2,041,245
        388,881     Sun Microsystems, Inc.*                           1,516,636
- --------------------------------------------------------------------------------
                                                                     22,096,023
- --------------------------------------------------------------------------------
ELECTRONIC EQUIPMENT & INSTRUMENTS -- 3.7%
         47,439     Molex Inc.                                        1,412,733
        183,333     Sanmina-SCI Corp.*                                1,836,997
- --------------------------------------------------------------------------------
                                                                      3,249,730
- --------------------------------------------------------------------------------
IT CONSULTING & SERVICES -- 2.2%
         82,675     Accenture Ltd., Class A Shares*                   1,965,185
- --------------------------------------------------------------------------------
SEMICONDUCTOR EQUIPMENT & PRODUCTS -- 17.1%
         19,903     Analog Devices, Inc.*                               847,868
         85,319     Applied Materials, Inc.*                          1,555,365
        370,122     Intel Corp.                                       9,523,239
         19,099     KLA-Tencor Corp.*                                   795,855
         56,553     Linear Technology Corp.                           2,014,983
          9,292     Maxim Integrated Products, Inc.                     427,339
- --------------------------------------------------------------------------------
                                                                     15,164,649
- --------------------------------------------------------------------------------

                       SEE NOTES TO FINANCIAL STATEMENTS.

          4   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




================================================================================
SCHEDULE OF INVESTMENTS (UNAUDITED) (CONTINUED)                   APRIL 30, 2004
================================================================================

SHARES                             SECURITY                            VALUE
================================================================================
SOFTWARE -- 25.9%
        106,598     Amdocs Ltd.*                                    $ 2,830,177
        146,252     BMC Software, Inc.*                               2,530,160
        125,065     Computer Associates International, Inc.           3,352,993
        372,104     Microsoft Corp.                                   9,663,541
        270,421     Oracle Corp.*                                     3,034,124
        148,332     Siebel Systems, Inc.*                             1,524,853
- --------------------------------------------------------------------------------
                                                                     22,935,848
- --------------------------------------------------------------------------------
                    TOTAL INFORMATION TECHNOLOGY                     79,254,788
================================================================================
                    TOTAL INVESTMENTS -- 100.0%
                    (Cost -- $87,876,878**)                         $88,656,387
================================================================================

  * NON-INCOME PRODUCING SECURITY.
 ** AGGREGATE COST FOR FEDERAL INCOME TAX PURPOSES IS SUBSTANTIALLY THE SAME.

    Abbreviation used in this schedule:
    -----------------------------------
    ADR -- American Depositary Receipt

                      SEE NOTES TO FINANCIAL STATEMENTS.

          5   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




================================================================================
STATEMENT  OF ASSETS AND LIABILITIES (UNAUDITED)                  APRIL 30, 2004
================================================================================

ASSETS:
     Investments, at value (Cost -- $87,876,878)                   $ 88,656,387
     Cash                                                                64,278
     Receivable for Fund shares sold                                    104,403
     Dividends receivable                                                 4,524
     Prepaid expenses                                                    21,998
- --------------------------------------------------------------------------------
     TOTAL ASSETS                                                    88,851,590
- --------------------------------------------------------------------------------
LIABILITIES:
     Payable for Fund shares reacquired                                  71,913
     Management fee payable                                              69,693
     Distribution plan fees payable                                      30,183
     Accrued expenses                                                    97,859
- --------------------------------------------------------------------------------
     TOTAL LIABILITIES                                                  269,648
- --------------------------------------------------------------------------------
TOTAL NET ASSETS                                                   $ 88,581,942
================================================================================
NET ASSETS:
     Par value of capital shares                                       $ 23,915
     Capital paid in excess of par value                            260,545,796
     Accumulated net investment loss                                   (819,662)
     Accumulated net realized loss from
       investment transactions                                     (171,947,616)
     Net unrealized appreciation of investments                         779,509
- --------------------------------------------------------------------------------
TOTAL NET ASSETS                                                   $ 88,581,942
================================================================================
SHARES OUTSTANDING:
- --------------------------------------------------------------------------------
     Class A                                                          6,839,453
- --------------------------------------------------------------------------------
     Class B                                                         10,167,780
- --------------------------------------------------------------------------------
     Class C                                                          6,907,710
- --------------------------------------------------------------------------------
NET ASSET VALUE:
     Class A (and redemption price)                                       $3.79
- --------------------------------------------------------------------------------
     Class B *                                                            $3.67
- --------------------------------------------------------------------------------
     Class C *                                                            $3.67
- --------------------------------------------------------------------------------
MAXIMUM PUBLIC OFFERING PRICE PER SHARE:
     Class A (net asset value plus 5.26% of
       net asset value per share)                                         $3.99
================================================================================

* REDEMPTION PRICE IS NAV OF CLASS B AND C SHARES REDUCED BY A 5.00% AND 1.00%
  CONTINGENT DEFERRED SALES CHARGE, RESPECTIVELY, IF SHARES ARE REDEEMED WITHIN
  ONE YEAR FROM PURCHASE PAYMENT (SEE NOTE 2).


                       SEE NOTES TO FINANCIAL STATEMENTS.

          6   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report



================================================================================
STATEMENT OF OPERATIONS (UNAUDITED)      FOR THE SIX MONTHS ENDED APRIL 30, 2004
================================================================================

INVESTMENT INCOME:
   Dividends                                                          $ 205,511
   Interest                                                              20,079
   Less: Foreign withholding tax                                         (7,686)
- --------------------------------------------------------------------------------
   TOTAL INVESTMENT INCOME                                              217,904
- --------------------------------------------------------------------------------
EXPENSES:
   Management fee (Note 2)                                              488,641
   Distribution plan fees (Note 6)                                      409,101
   Transfer agency services (Note 6)                                     69,865
   Shareholder communications (Note 6)                                   34,034
   Audit and legal                                                       21,216
   Registration fees                                                     12,365
   Custody                                                               11,468
   Directors' fees                                                       11,320
   Other                                                                  2,335
- --------------------------------------------------------------------------------
   TOTAL EXPENSES                                                     1,060,345
   Less: Management fee waiver (Note 2)                                 (25,113)
- --------------------------------------------------------------------------------
   NET EXPENSES                                                       1,035,232
- --------------------------------------------------------------------------------
NET INVESTMENT LOSS                                                    (817,328)
- --------------------------------------------------------------------------------
REALIZED AND UNREALIZED LOSS ON INVESTMENTS (NOTE 3):
   Realized Loss From Investment Transactions
     (excluding short-term securities):
      Proceeds from sales                                            51,617,125
      Cost of securities sold                                        51,971,668
- --------------------------------------------------------------------------------
   NET REALIZED LOSS                                                   (354,543)
- --------------------------------------------------------------------------------
   Change in Net Unrealized Appreciation of Investments:
      Beginning of period                                             2,479,964
      End of period                                                     779,509
- --------------------------------------------------------------------------------
   DECREASE IN NET UNREALIZED APPRECIATION                           (1,700,455)
- --------------------------------------------------------------------------------
NET LOSS ON INVESTMENTS                                              (2,054,998)
- --------------------------------------------------------------------------------
DECREASE IN NET ASSETS FROM OPERATIONS                              $(2,872,326)
================================================================================






                       SEE NOTES TO FINANCIAL STATEMENTS.

          7   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report






=================================================================================================================
STATEMENTS OF CHANGES IN NET ASSETS
=================================================================================================================

FOR THE SIX MONTHS ENDED APRIL 30, 2004 (UNAUDITED)
AND THE YEAR ENDED OCTOBER 31, 2003
                                                                                 2004                    2003
=================================================================================================================
                                                                                           
OPERATIONS:
   Net investment loss                                                      $    (817,328)       $    (1,318,046)
   Net realized loss                                                             (354,543)           (18,013,960)
   Increase (decrease) in net unrealized appreciation                          (1,700,455)            47,191,032
- -----------------------------------------------------------------------------------------------------------------
   INCREASE (DECREASE) IN NET ASSETS FROM OPERATIONS                           (2,872,326)            27,859,026
- -----------------------------------------------------------------------------------------------------------------
FUND SHARE TRANSACTIONS (NOTE 7):
   Net proceeds from sale of shares                                            15,813,760             18,564,129
   Cost of shares reacquired                                                  (24,562,692)           (15,440,011)
- -----------------------------------------------------------------------------------------------------------------
   INCREASE (DECREASE) IN NET ASSETS FROM FUND SHARE TRANSACTIONS              (8,748,932)             3,124,118
- -----------------------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS                                             (11,621,258)            30,983,144
NET ASSETS:
   Beginning of period                                                        100,203,200             69,220,056
- -----------------------------------------------------------------------------------------------------------------
   END OF PERIOD*                                                             $88,581,942           $100,203,200
=================================================================================================================
*  Includes accumulated net investment loss of:                                 $(819,662)               $(2,334)
=================================================================================================================




                       SEE NOTES TO FINANCIAL STATEMENTS.

          8   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




================================================================================
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
================================================================================

1. Significant Accounting Policies

The Smith Barney  Technology  Fund ("Fund"),  a separate  investment fund of the
Smith  Barney  Sector  Series  Inc.  ("Company"),  a  Maryland  corporation,  is
registered  under  the  Investment  Company  Act  of  1940,  as  amended,  as  a
non-diversified  open-end management investment company. The Company consists of
this  Fund and two other  separate  investment  funds:  Smith  Barney  Financial
Services Fund and Smith Barney Health  Sciences Fund.  The financial  statements
and  financial  highlights  for  the  other  funds  are  presented  in  separate
shareholder reports.

The following are significant  accounting policies  consistently followed by the
Fund  and  are in  conformity  with  generally  accepted  accounting  principles
("GAAP"):  (a)  security  transactions  are  accounted  for on trade  date;  (b)
securities  traded on  national  securities  markets  are valued at the  closing
prices in the primary  exchange on which they are traded;  securities  listed or
traded on certain  foreign  exchanges  or other  markets  whose  operations  are
similar to the U.S.  over-the-counter  market  (including  securities  listed on
exchanges where the primary market is believed to be  over-the-counter)  and the
securities  for which no sale was  reported  on that date are valued at the mean
between the bid and asked prices;  securities which are listed or traded on more
than one  exchange  or market are valued at the  quotations  on the  exchange or
market  determined  to be the  primary  market for such  securities;  securities
listed on the NASDAQ  National  Market  System for which market  quotations  are
available  are valued at the official  closing price or, if there is no official
closing  price on that day, at the last sale  price;  (c)  securities  for which
market  quotations  are not available will be valued in good faith at fair value
by or under the direction of the Board of  Directors;  (d)  securities  maturing
within 60 days are valued at cost plus  accreted  discount,  or minus  amortized
premium,  which  approximates  value; (e) the accounting records of the Fund are
maintained in U.S.  dollars.  All assets and liabilities  denominated in foreign
currencies  are  translated  into U.S.  dollars based on the rate of exchange of
such  currencies  against U.S.  dollars on the date of valuation.  Purchases and
sales of  securities,  and income and  expenses  are  translated  at the rate of
exchange  quoted on the  respective  date that such  transactions  are recorded.
Differences between income or expense amounts recorded and collected or paid are
adjusted  when  reported by the  custodian;  (f) interest  income,  adjusted for
amortization  of premium and  accretion of  discount,  is recorded on an accrual
basis;  (g)  dividend  income  is  recorded  on the  ex-dividend  date;  foreign
dividends are recorded on the ex-dividend date or as soon as practical after the
Fund  determines  the  existence  of a  dividend  declaration  after  exercising
reasonable due diligence;  (h) dividends and  distributions  to shareholders are
recorded on the  ex-dividend  date; the Fund  distributes  dividends and capital
gains, if any, at least annually;  (i) gains or losses on the sale of securities
are calculated by using the specific  identification  method; (j) class specific
expenses are charged to each class;  management  fees and general fund  expenses
are  allocated  on the basis of relative  net assets of each class or on another
reasonable  basis;  (k) the character of income and gains to be  distributed  is
determined in accordance with income tax regulations  which may differ from U.S.
generally accepted  accounting  principles;  (l) the Fund intends to comply with
the  applicable  provisions  of the Internal  Revenue Code of 1986,  as amended,
pertaining  to  regulated  investment  companies  and to make  distributions  of
taxable income  sufficient to relieve it from  substantially  all Federal income
and excise  taxes;  and (m) estimates  and  assumptions  are required to be made
regarding  assets,   liabilities  and  changes  in  net  assets  resulting  from
operations  when  financial  statements  are  prepared.  Changes in the economic
environment,  financial  markets and any other  parameters  used in  determining
these estimates could cause actual results to differ.

In  addition,  the Fund may enter into  forward  exchange  contracts in order to
hedge against foreign currency risk. These contracts are marked-to-market daily,
by recognizing the difference between the contract exchange rate and the current
market  rate as an  unrealized  gain or  loss.  Realized  gains  or  losses  are
recognized when contracts are settled or offset by entering into another forward
exchange  contract.  The Fund may from time to time  enter into  options  and/or
futures contracts typically to hedge market or currency risk.



          9   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




================================================================================
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)
================================================================================

2. Management Agreement and Other Transactions

Smith Barney Fund Management LLC ("SBFM"), an indirect  wholly-owned  subsidiary
of Citigroup  Inc.  ("Citigroup"),  acts as investment  manager to the Fund. The
Fund pays SBFM a  management  fee  calculated  at an annual rate of 0.95% of the
Fund's average daily net assets.  This fee is calculated daily and paid monthly.
SBFM has entered into a sub-advisory  agreement with Citigroup Asset  Management
Ltd. ("CAM Ltd."), an affiliate of SBFM. Pursuant to the sub-advisory agreement,
CAM Ltd. is  responsible  for the  day-to-day  fund  operations  and  investment
decisions of the Fund. For services  provided to the Fund,  SBFM pays CAM Ltd. a
sub-advisory  fee  calculated  at an annual rate of 0.65% of the Fund's  average
daily net assets.

During the six months ended April 30,  2004,  the Fund's Class A, B and C shares
had  voluntary  expense   limitations  in  place  of  1.50%,  2.25%  and  2.25%,
respectively,  resulting  in waived  management  fees  totaling  $25,113.  These
expense limitations can be terminated at any time by SBFM.

Citicorp Trust Bank, fsb. ("CTB"), another subsidiary of Citigroup,  acts as the
Fund's transfer agent.  PFPC Inc.  ("PFPC") and Primerica  Shareholder  Services
("PSS"), another subsidiary of Citigroup, act as the Fund's sub-transfer agents.
CTB receives  account fees and asset-based  fees that vary according to the size
and type of account. PFPC and PSS are responsible for shareholder  recordkeeping
and financial  processing for all shareholder  accounts and are paid by CTB. For
the six  months  ended  April 30,  2004,  the Fund paid  transfer  agent fees of
$51,452 to CTB.

Citigroup Global Markets Inc. ("CGM") and PFS Distributors,  Inc., both of which
are subsidiaries of Citigroup, act as the Fund's distributors.

On April 29, 2004, Class L shares were renamed as Class C shares. On February 2,
2004, initial sales charges on these shares were eliminated.

There is a maximum initial sales charge of 5.00% for Class A shares.  There is a
contingent  deferred  sales  charge  ("CDSC") of 5.00% on Class B shares,  which
applies if redemption  occurs within one year from purchase payment and declines
thereafter by 1.00% per year until no CDSC is incurred. Class C shares also have
a 1.00% CDSC,  which applies if redemption  occurs within one year from purchase
payment.  In  addition,  Class A shares  have a 1.00%  CDSC,  which  applies  if
redemption occurs within one year from purchase  payment.  This CDSConly applies
to those purchases of Class A shares which,  when combined with current holdings
of Class A shares, equal or exceed $1,000,000 in the aggregate.  These purchases
do not incur an initial sales charge.

For the six months ended April 30, 2004, CGM and its  affiliates  received sales
charges of approximately $20,000 and $9,000 on sales of the Fund's Class A and C
shares,  respectively.  In  addition,  for the six months  ended April 30, 2004,
CDSCs paid to CGM and its affiliates were approximately:

                                                       CLASS B        CLASS C
================================================================================
CDSCs                                                  $50,000        $3,000
================================================================================

For the six  months  ended  April  30,  2004,  CGM and its  affiliates  received
brokerage commissions of $9,427.

All officers  and one Director of the Company are  employees of Citigroup or its
affiliates.

3. Investments

During the six months ended April 30, 2004,  the aggregate cost of purchases and
proceeds  from  sales  of   investments   (including   maturities  of  long-term
investments, but excluding short-term investments) were as follows:

================================================================================
Purchases                                                          $45,175,671
================================================================================
Sales                                                               51,617,125
================================================================================

          10   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report



================================================================================
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)
================================================================================

At April 30, 2004, the aggregate gross unrealized  appreciation and depreciation
of investments for Federal income tax purposes were substantially as follows:

================================================================================
Gross unrealized appreciation                                       $ 6,732,937
Gross unrealized depreciation                                        (5,953,428)
================================================================================
Net unrealized appreciation                                         $   779,509
================================================================================

4. Repurchase Agreements

When  entering  into  repurchase  agreements,  it is the  Fund's  policy  that a
custodian takes possession of the underlying collateral securities, the value of
which at least  equals  the  principal  amount  of the  repurchase  transaction,
including  accrued  interest.  To the  extent  that any  repurchase  transaction
exceeds one business  day, the value of the  collateral is  marked-to-market  to
ensure the adequacy of the  collateral.  If the seller defaults and the value of
the collateral declines or if bankruptcy  proceedings are commenced with respect
to the seller of the security,  realization of the collateral by the Fund may be
delayed or limited.

5. Concentration of Risk

The Fund  normally  invests  at least 80% of its  assets in  technology  related
investments.  As a result of this  concentration  policy, the Fund's investments
may be subject to greater risk and market  fluctuation  than a fund that invests
in securities representing a broader range of investment alternatives.

6. Class Specific Expenses

Pursuant  to a Rule 12b-1  Distribution  Plan,  the Fund pays a service fee with
respect to its Class A, B and C shares  calculated at an annual rate of 0.25% of
the average daily net assets of each  respective  class.  In addition,  the Fund
also pays a distribution fee with respect to Class B and C shares  calculated at
an  annual  rate of  0.75%  of the  average  daily  net  assets  of each  class,
respectively.  For the six  months  ended  April  30,  2004,  total  Rule  12b-1
Distribution  Plan  fees,  which are  accrued  daily and paid  monthly,  were as
follows:

                                         CLASS A         CLASS B        CLASS C
================================================================================
Rule 12b-1 Distribution Plan Fees        $35,086        $208,803       $165,212
================================================================================

For the six months ended April 30, 2004,  total Transfer Agency Service expenses
were as follows:

                                         CLASS A         CLASS B        CLASS C
================================================================================
Transfer Agency Service Expenses         $18,970         $28,280        $22,615
================================================================================

For the six  months  ended  April  30,  2004,  total  Shareholder  Communication
expenses were as follows:

                                         CLASS A         CLASS B        CLASS C
================================================================================
Shareholder Communication Expenses        $9,306         $13,829         $10,899
================================================================================


7.  Capital Shares

At April 30, 2004, the Fund had 800 million  shares of capital stock  authorized
with a par value of $0.001 per share. The Fund has the ability to issue multiple
classes of shares. Each share of a class represents an identical interest in the
Fund and has the same  rights,  except  that each class bears  certain  expenses
specifically  related to the  distribution  of its shares.  Effective  April 29,
2004, the Fund renamed Class L shares as Class C shares.


          11   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report






====================================================================================================================================
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)
====================================================================================================================================

Transactions in shares of each class were as follows:
                                                                    SIX MONTHS ENDED                           YEAR ENDED
                                                                     APRIL 30, 2004                         OCTOBER 31, 2003
                                                              -----------------------------           ------------------------------
                                                                 SHARES          AMOUNT                  SHARES          AMOUNT
====================================================================================================================================
                                                                                                            
CLASS A
Shares sold                                                    1,115,186       $ 4,600,835             1,873,768       $ 6,063,645
Shares reacquired                                             (1,146,014)       (4,659,478)           (1,395,233)       (4,488,352)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase (Decrease)                                          (30,828)        $ (58,643)              478,535       $ 1,575,293
====================================================================================================================================
CLASS B
Shares sold                                                      634,957       $ 2,502,242             2,010,147       $ 6,240,032
Shares reacquired                                             (1,383,590)       (5,484,205)           (1,866,876)       (5,798,567)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase (Decrease)                                         (748,633)      $(2,981,963)              143,271       $   441,465
====================================================================================================================================
CLASS C+
Shares sold                                                    2,235,676       $ 8,710,683             1,813,427       $ 6,260,452
Shares reacquired                                             (3,613,690)      (14,419,009)           (1,661,743)       (5,153,092)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase (Decrease)                                       (1,378,014)      $(5,708,326)              151,684       $ 1,107,360
====================================================================================================================================


+ ON APRIL 29, 2004, CLASS L SHARES WERE RENAMED AS CLASS C SHARES.


8.  Additional Information

The Fund has received the following  information from Citigroup Asset Management
("CAM"),  the  Citigroup  business  unit which  includes  the Fund's  Investment
Manager and other  investment  advisory  companies,  all of which are  indirect,
wholly-owned  subsidiaries of Citigroup.  CAM is reviewing its entry, through an
affiliate,  into the transfer  agent  business in the period  1997-1999.  As CAM
currently  understands  the facts, at the time CAM decided to enter the transfer
agent  business,  CAM  sub-contracted  for a period of five years certain of the
transfer agency services to a third party and also concluded a revenue guarantee
agreement  with this  sub-contractor  providing  that the  sub-contractor  would
guarantee  certain  benefits to CAM or its  affiliates  (the "Revenue  Guarantee
Agreement").  In connection with the subsequent purchase of the sub-contractor's
business by an affiliate of the current  sub-transfer  agent (PFPC Inc.) used by
CAM on many of the  funds it  manages,  this  Revenue  Guarantee  Agreement  was
amended  eliminating those benefits in exchange for arrangements that included a
one-time payment from the sub-contractor.

The Boards of CAM-managed  funds (the "Boards") were not informed of the Revenue
Guarantee  Agreement with the  sub-contractor  at the time the Boards considered
and approved the transfer agent  arrangements.  Nor were the Boards  informed of
the subsequent amendment to the Revenue Guarantee Agreement when that occurred.

CAM has begun to take corrective  actions.  CAM will pay to the applicable funds
approximately  $17 million (plus interest) that CAM and its affiliates  received
from the  Revenue  Guarantee  Agreement  and its  amendment.  CAM also  plans an
independent  review to verify that the transfer  agency fees charged by CAM were
fairly priced as compared to competitive  alternatives.  CAM is instituting  new
procedures and making  changes  designed to ensure no similar  arrangements  are
entered into in the future.

CAM has  briefed  the  SEC,  the New  York  State  Attorney  General  and  other
regulators  with  respect to this  matter,  as well as the U.S.  Attorney who is
investigating the matter.  CAM is cooperating with  governmental  authorities on
this matter, the ultimate outcome of which is not yet determinable.


          12   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report



================================================================================
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)
================================================================================


9.  Legal Matters

Class action lawsuits have been filed against Citigroup Global Markets Inc. (the
"Distributor")  and a number of its  affiliates,  including  Smith  Barney  Fund
Management  LLC and Salomon  Brothers  Asset  Management  Inc (the  "Advisers"),
substantially all of the mutual funds managed by the Advisers (the "Funds"), and
directors or trustees of the Funds. The complaints  allege,  among other things,
that the Distributor created various  undisclosed  incentives for its brokers to
sell Smith Barney and Salomon  Brothers  funds.  In  addition,  according to the
complaints, the Advisers caused the Funds to pay excessive brokerage commissions
to  the  Distributor  for  steering  clients  towards   proprietary  funds.  The
complaints also allege that the defendants  breached their fiduciary duty to the
Funds by  improperly  charging  Rule 12b-1 fees and by drawing on Fund assets to
make undisclosed  payments of soft dollars and excessive brokerage  commissions.
The complaints seek injunctive  relief and  compensatory  and punitive  damages,
rescission of the Funds' contracts with the Advisers,  recovery of all fees paid
to the Advisers  pursuant to such contracts and an award of attorneys'  fees and
litigation  expenses.  Citigroup  Asset  Management  believes that the suits are
without merit and intends to defend the cases vigorously.

Additional  lawsuits arising out of these  circumstances and presenting  similar
allegations  and requests for relief may be filed against the  defendants in the
future. Neither Citigroup Asset Management nor the Funds believe that any of the
pending actions will have a material  adverse effect on the Funds or the ability
of the Distributor or the Advisers to perform under their  respective  contracts
with the Funds.

          13   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report





====================================================================================================================================
FINANCIAL  HIGHLIGHTS
====================================================================================================================================

FOR A SHARE OF EACH CLASS OF CAPITAL STOCK OUTSTANDING THROUGHOUT EACH YEAR ENDED OCTOBER 31, UNLESS OTHERWISE NOTED:


CLASS A SHARES                                                2004(1)(2)       2003(2)       2002(2)         2001         2000(3)
====================================================================================================================================
                                                                                                           
NET ASSET VALUE, BEGINNING OF PERIOD                              $ 3.92         $ 2.78         $ 4.21        $ 9.14      $11.40
- ------------------------------------------------------------------------------------------------------------------------------------
INCOME (LOSS) FROM OPERATIONS:
  Net investment loss(4)                                           (0.02)         (0.04)         (0.05)        (0.08)      (0.07)
  Net realized and unrealized gain (loss)                          (0.11)          1.18          (1.38)        (4.85)      (2.19)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Income (Loss) From Operations                                (0.13)          1.14          (1.43)        (4.93)      (2.26)
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                                    $ 3.79         $ 3.92         $ 2.78        $ 4.21      $ 9.14
- ------------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN(5)                                                    (3.32)%++      41.01%        (33.97)%      (53.94)%    (19.82)%++
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSETS, END OF PERIOD (000s)                                 $25,907        $26,946        $17,754       $27,058     $46,363
- ------------------------------------------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
   Expenses(4)(6)                                                   1.47%+         1.50%          1.50%         1.50%       1.52%+
   Net investment loss                                             (1.04)+        (1.09)         (1.29)        (1.31)      (1.31)+
- ------------------------------------------------------------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                                                45%           54%            76%           62%         24%
====================================================================================================================================


(1) FOR THE SIX MONTHS ENDED APRIL 30, 2004 (UNAUDITED).

(2) PER SHARE  AMOUNTS HAVE BEEN  CALCULATED  USING THE MONTHLY  AVERAGE  SHARES
    METHOD.

(3) FOR THE PERIOD FEBRUARY 28, 2000 (INCEPTION DATE) TO OCTOBER 31, 2000.

(4) THE MANAGER  WAIVED A PORTION OF ITS FEES FOR THE SIX MONTHS ENDED APRIL 30,
    2004, THE YEARS ENDED OCTOBER 31, 2003,  2002 AND 2001, AND THE PERIOD ENDED
    OCTOBER 31, 2000. IF SUCH FEES WERE NOT WAIVED,  THE PER SHARE  INCREASES TO
    NET  INVESTMENT  LOSS AND THE  ACTUAL  EXPENSE  RATIOS  WOULD  HAVE  BEEN AS
    FOLLOWS:

                             Per Share Increases to           Expense Ratios
                               Net Investment Loss          Without Fee Waivers
                             ----------------------         -------------------
           2004                      $0.00*                       1.51%+
           2003                       0.00*                       1.60
           2002                       0.01                        1.64
           2001                       0.00*                       1.58
           2000                       0.00*                       1.60+

(5) PERFORMANCE  FIGURES MAY REFLECT FEE WAIVERS AND/OR EXPENSE  REIMBURSEMENTS.
    PAST  PERFORMANCE IS NO GUARANTEE OF FUTURE  RESULTS.  IN THE ABSENCE OF FEE
    WAIVERS AND/OR EXPENSE REIMBURSEMENTS, THE TOTAL RETURN WOULD BE REDUCED.

(6) AS A RESULT OF  VOLUNTARY  EXPENSE  LIMITATIONS,  THE RATIO OF  EXPENSES  TO
    AVERAGE  NET ASSETS WILL NOT EXCEED  1.50%.

*   AMOUNT REPRESENTS LESS THAN $0.01 PER SHARE.

++  TOTAL RETURN IS NOT ANNUALIZED, AS IT MAY NOT BE REPRESENTATIVE OF THE TOTAL
    RETURN FOR THE YEAR.

+   ANNUALIZED.






          14   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report






====================================================================================================================================
FINANCIAL  HIGHLIGHTS (CONTINUED)
====================================================================================================================================

FOR A SHARE OF EACH CLASS OF CAPITAL STOCK OUTSTANDING THROUGHOUT EACH YEAR ENDED OCTOBER 31, UNLESS OTHERWISE NOTED:

CLASS B SHARES                                             2004(1)(2)       2003(2)       2002(2)         2001          2000(3)
====================================================================================================================================
                                                                                                           
NET ASSET VALUE, BEGINNING OF PERIOD                           $ 3.81         $ 2.72         $ 4.16        $ 9.09         $11.40
- ------------------------------------------------------------------------------------------------------------------------------------
INCOME (LOSS) FROM OPERATIONS:
  Net investment loss(4)                                        (0.04)         (0.06)         (0.08)        (0.12)         (0.12)
  Net realized and unrealized gain (loss)                       (0.10)          1.15          (1.36)        (4.81)         (2.19)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Income (Loss) From Operations                             (0.14)          1.09          (1.44)        (4.93)         (2.31)
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                                 $ 3.67         $ 3.81         $ 2.72        $ 4.16         $ 9.09
- ------------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN(5)                                                 (3.67)%++      40.07%        (34.62)%      (54.24)%       (20.26)%++
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSETS, END OF PERIOD (000s)                              $37,320        $41,645        $29,324       $45,266        $74,227
- ------------------------------------------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
   Expenses(4)(6)                                                2.22%+         2.25%          2.24%         2.25%          2.27%+
   Net investment loss                                          (1.79)+        (1.85)         (2.04)        (2.06)         (2.06)+
- ------------------------------------------------------------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                                             45%           54%            76%           62%            24%
====================================================================================================================================


(1) FOR THE SIX MONTHS ENDED APRIL 30, 2004  (UNAUDITED).

(2) PER SHARE  AMOUNTS HAVE BEEN  CALCULATED  USING THE MONTHLY  AVERAGE  SHARES
    METHOD.

(3) FOR THE PERIOD FEBRUARY 28, 2000 (INCEPTION DATE) TO OCTOBER 31, 2000.

(4) THE MANAGER  WAIVED A PORTION OF ITS FEES FOR THE SIX MONTHS ENDED APRIL 30,
    2004, THE YEARS ENDED OCTOBER 31, 2003,  2002 AND 2001, AND THE PERIOD ENDED
    OCTOBER 31, 2000. IF SUCH FEES WERE NOT WAIVED,  THE PER SHARE  INCREASES TO
    NET  INVESTMENT  LOSS AND THE  ACTUAL  EXPENSE  RATIOS  WOULD  HAVE  BEEN AS
    FOLLOWS:

                             Per Share Increases to           Expense Ratios
                               Net Investment Loss          Without Fee Waivers
                             ----------------------         -------------------
           2004                      $0.00*                       2.26%+
           2003                       0.00*                       2.35
           2002                       0.01                        2.39
           2001                       0.00*                       2.33
           2000                       0.00*                       2.35+

(5) PERFORMANCE  FIGURES MAY REFLECT FEE WAIVERS AND/OR EXPENSE  REIMBURSEMENTS.
    PAST  PERFORMANCE IS NO GUARANTEE OF FUTURE  RESULTS.  IN THE ABSENCE OF FEE
    WAIVERS AND/OR EXPENSE REIMBURSEMENTS, THE TOTAL RETURN WOULD BE REDUCED.

(6) AS A RESULT OF  VOLUNTARY  EXPENSE  LIMITATIONS,  THE RATIO OF  EXPENSES  TO
    AVERAGE NET ASSETS WILL NOT EXCEED 2.25%.

*   AMOUNT REPRESENTS LESS THAN $0.01 PER SHARE.

++  TOTAL RETURN IS NOT ANNUALIZED, AS IT MAY NOT BE REPRESENTATIVE OF THE TOTAL
    RETURN FOR THE YEAR.

+   ANNUALIZED.







          15   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report






====================================================================================================================================
FINANCIAL  HIGHLIGHTS (CONTINUED)
====================================================================================================================================

FOR A SHARE OF EACH CLASS OF CAPITAL STOCK OUTSTANDING THROUGHOUT EACH YEAR ENDED OCTOBER 31, UNLESS OTHERWISE NOTED:

CLASS C SHARES(1)                                             2004(2)(3)       2003(3)       2002(3)         2001          2000(4)
====================================================================================================================================
                                                                                                           
NET ASSET VALUE, BEGINNING OF PERIOD                           $ 3.82         $ 2.72         $ 4.16        $ 9.09         $11.40
- ------------------------------------------------------------------------------------------------------------------------------------
INCOME (LOSS) FROM OPERATIONS:
  Net investment loss(5)                                        (0.04)         (0.06)         (0.08)        (0.12)         (0.12)
  Net realized and unrealized gain (loss)                       (0.11)          1.16          (1.36)        (4.81)         (2.19)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Income (Loss) From Operations                             (0.15)          1.10          (1.44)        (4.93)         (2.31)
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                                 $ 3.67         $ 3.82         $ 2.72        $ 4.16         $ 9.09
- ------------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN(6)                                                 (3.93)%++      40.44%        (34.62)%      (54.24)%       (20.26)%++
- ------------------------------------------------------------------------------------------------------------------------------------
NET ASSETS, END OF PERIOD (000s)                              $25,355        $31,612        $22,142       $39,127        $67,815
- ------------------------------------------------------------------------------------------------------------------------------------
RATIOS TO AVERAGE NET ASSETS:
   Expenses(5)(7)                                                2.22%+         2.25%          2.24%         2.25%          2.27%+
   Net investment loss                                          (1.80)+        (1.84)         (2.04)        (2.06)         (2.06)+
- ------------------------------------------------------------------------------------------------------------------------------------
PORTFOLIO TURNOVER RATE                                             45%           54%            76%           62%             24%
====================================================================================================================================


(1) ON APRIL 29, 2004, CLASS L SHARES WERE RENAMED AS CLASS C SHARES.

(2) FOR THE SIX MONTHS ENDED APRIL 30, 2004  (UNAUDITED).

(3) PER SHARE  AMOUNTS HAVE BEEN  CALCULATED  USING THE MONTHLY  AVERAGE  SHARES
    METHOD.

(4) FOR THE PERIOD FEBRUARY 28, 2000 (INCEPTION DATE) TO OCTOBER 31, 2000.

(5) THE MANAGER  WAIVED A PORTION OF ITS FEES FOR THE SIX MONTHS ENDED APRIL 30,
    2004, THE YEARS ENDED OCTOBER 31, 2003,  2002 AND 2001, AND THE PERIOD ENDED
    OCTOBER 31, 2000. IF SUCH FEES WERE NOT WAIVED,  THE PER SHARE  INCREASES TO
    NET  INVESTMENT  LOSS AND THE  ACTUAL  EXPENSE  RATIOS  WOULD  HAVE  BEEN AS
    FOLLOWS:

                            Per Share Increases to           Expense Ratios
                              Net Investment Loss          Without Fee Waivers
                            ----------------------         -------------------
          2004                      $0.00*                       2.26%+
          2003                       0.00*                       2.35
          2002                       0.01                        2.39
          2001                       0.00*                       2.33
          2000                       0.00*                       2.35+

(6) PERFORMANCE  FIGURES MAY REFLECT FEE WAIVERS AND/OR EXPENSE  REIMBURSEMENTS.
    PAST  PERFORMANCE IS NO GUARANTEE OF FUTURE  RESULTS.  IN THE ABSENCE OF FEE
    WAIVERS AND/OR EXPENSE REIMBURSEMENTS, THE TOTAL RETURN WOULD BE REDUCED.

(7) AS A RESULT OF  VOLUNTARY  EXPENSE  LIMITATIONS,  THE RATIO OF  EXPENSES  TO
    AVERAGE  NET ASSETS WILL NOT EXCEED  2.25%.

*   AMOUNT  REPRESENTS  LESS  THAN  $0.01  PER  SHARE.

++  TOTAL RETURN IS NOT ANNUALIZED, AS IT MAY NOT BE REPRESENTATIVE OF THE TOTAL
    RETURN FOR THE YEAR.

+   ANNUALIZED.





          16   SMITH BARNEY SECTOR SERIES INC. | 2004 Semi-Annual Report




- --------------------------------------------------------------------------------
SMITH BARNEY
TECHNOLOGY FUND#
- --------------------------------------------------------------------------------

    DIRECTORS
    Dwight B. Crane
    Burt N. Dorsett
    R. Jay Gerken, CFA
      CHAIRMAN
    Elliot S. Jaffe
    Stephen E. Kaufman
    Joseph J. McCann
    Cornelius C. Rose, Jr.

    OFFICERS
    R. Jay Gerken, CFA
    President and Chief
    Executive Officer

    Andrew B. Shoup
    Senior Vice President and
    Chief Administrative Officer

    Andrew Beagley
    Chief Anti-Money Laundering
    Compliance Officer

    Kaprel Ozsolak
    Controller

    Robert I. Frenkel
    Secretary and
    Chief Legal Officer



  INVESTMENT MANAGER
  Smith Barney Fund Management LLC

  DISTRIBUTORS
  Citigroup Global Markets Inc.
  PFS Distributors, Inc.

  CUSTODIAN
  State Street Bank and
  Trust Company

  TRANSFER AGENT
  Citicorp Trust Bank, fsb.
  125 Broad Street, 11th Floor
  New York, New York 10004

  SUB-TRANSFER AGENTS
  PFPCInc. P.O. Box 9699
  Providence, Rhode Island
  02940-9699

  Primerica Shareholder Services
  P.O. Box 9662
  Providence, Rhode Island
  02940-9662



SMITH BARNEY SECTOR SERIES INC.
================================================================================

SMITH BARNEY TECHNOLOGY FUND
The Fund is a separate investment fund of the Smith Barney Sector Series Inc., a
Maryland corporation.






A description of the policies and procedures that the Fund uses to determine how
to vote proxies relating to portfolio securities is available without charge,
upon request, by telephoning the Fund (toll-free) at 1-800-451-2010 and by
visiting the SEC's web site at www.sec.gov.






This report is submitted for the general information of the shareholders of
Smith Barney Sector Series Inc. -- Smith Barney Technology Fund, but it may also
be used as sales literature when preceded or accompanied by the current
Prospectus.

SMITH BARNEY TECHNOLOGY FUND
Smith Barney Mutual Funds
125 Broad Street
10th Floor, MF-2
New York, New York 10004



THIS DOCUMENT MUST BE PRECEDED OR ACCOMPANIED BY A FREE PROSPECTUS. INVESTORS
SHOULD CONSIDER THE FUND'S INVESTMENT OBJECTIVES, RISKS, CHARGES AND EXPENSES
CAREFULLY BEFORE INVESTING. THE PROSPECTUS CONTAINS THIS AND OTHER IMPORTANT
INFORMATION ABOUT THE FUND. PLEASE READ THE PROSPECTUS CAREFULLY BEFORE YOU
INVEST OR SEND MONEY.

www.smithbarneymutualfunds.com






(C)2004 Citigroup Global Markets Inc.
Member NASD, SIPC

FD02551 6/04                                                          04-6776




ITEM 2.  CODE OF ETHICS.

         Not Applicable.

ITEM 3.  AUDIT COMMITTEE FINANCIAL EXPERT.

         Not Applicable.

ITEM 4.  PRINCIPAL ACCOUNTANT FEES AND SERVICES.

         Not applicable.

ITEM 5.  AUDIT COMMITTEE OF LISTED REGISTRANTS.

         Not applicable.

ITEM 6.  [RESERVED]

ITEM 7.  DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
         MANAGEMENT INVESTMENT COMPANIES.

         Not applicable.

ITEM 8.  [RESERVED]

ITEM 9.  CONTROLS AND PROCEDURES.

         (a)  The registrant's principal executive officer and principal
              financial officer have concluded that the registrant's disclosure
              controls and procedures (as defined in Rule 30a- 3(c) under the
              Investment Company Act of 1940, as amended (the "1940 Act")) are
              effective as of a date within 90 days of the filing date of this
              report that includes the disclosure required by this paragraph,
              based on their evaluation of the disclosure controls and
              procedures required by Rule 30a-3(b) under the 1940 Act and
              15d-15(b) under the Securities Exchange Act of 1934.

         (b)  There were no changes in the registrant's internal control over
              financial reporting (as defined in Rule 30a-3(d) under the 1940
              Act) that occurred during the registrant's last fiscal half-year
              (the registrant's second fiscal half-year in the case of an annual
              report) that have materially affected, or are likely to materially
              affect the registrant's internal control over financial reporting.

ITEM 10. EXHIBITS.

         (a)  Not applicable.

         (b)  Attached hereto.

         Exhibit 99.CERT        Certifications pursuant to section 302 of the
                                Sarbanes-Oxley Act of 2002

         Exhibit 99.906CERT     Certifications pursuant to Section 906 of the
                                Sarbanes-Oxley Act of 2002



                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this Report to be
signed on its behalf by the undersigned, there unto duly authorized.

Smith Barney Sector Series Inc.


By:      /s/ R. Jay Gerken
         -----------------------------------------
         R. Jay Gerken
         Chief Executive Officer of
         Smith Barney Sector Series Inc.

Date:    July 7, 2004


     Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment  Company  Act of  1940,  this  report  has been  signed  below by the
following  persons on behalf of the  registrant and in the capacities and on the
dates indicated.

By:      /s/ R. Jay Gerken
         ------------------------------------------
         R. Jay Gerken
         Chief Executive Officer of
         Smith Barney Sector Series Inc.

Date:    July 7, 2004

By:      /s/ Andrew B. Shoup
         ------------------------------------------
         Andrew B. Shoup
         Chief Administrative Officer of
         Smith Barney Sector Series Inc.

Date:    July 7, 2004