GATEWAY TRUST
N-30D, 1996-08-15
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<PAGE>   1
                         [insert Statue of Liberty logo]

                                     GATEWAY
                                 INDEX PLUS FUND

                                   SEMI-ANNUAL
                                     REPORT
                                      1996

                   MEMBER OF 100% NO-LOAD MUTUAL FUND COUNCIL

                         [insert Statue of Liberty logo]

                                The Gateway Trust
                                 P. O. Box 5211
                            Cincinnati, OH 45201-5211
                                 (800) 354-6339
<PAGE>   2
GATEWAY INDEX PLUS FUND
Highlights at June 30, 1996


<TABLE>
<CAPTION>
                                             AVERAGE ANNUAL TOTAL RETURN
                                ------------------------------------------------------
                       Past        One     Three      Five      Ten  Since Inception    Dividends      Price
                      Quarter     Year     Years     Years     Years   on 12/7/77     Year to Date   Per Share
                      -------     ----     -----     -----     ----- ---------------  ------------   ---------
<S>                    <C>       <C>      <C>       <C>       <C>        <C>             <C>          <C>   
Gateway Index Plus     3.03%      9.63%    8.48%     8.61%     9.55%      10.35%          $0.10        $17.62

S&P 500                4.49      26.00    17.22     15.73     13.78

Lehman Gov't/
 Corp. Bond            0.47       4.66     5.16      8.48      8.41

U. S. Inflation (CPI)  0.67       2.79     2.77      2.88      3.66
</TABLE>

<TABLE>
<CAPTION>
                                               CUMULATIVE TOTAL RETURN
                               -------------------------------------------------------
                        Past      One     Three      Five       Ten   Since Inception
                      Quarter    Year     Years     Years      Years    on 12/7/77
                      -------    ----     -----     -----     ------  ---------------
<S>                    <C>       <C>      <C>       <C>       <C>          <C>    
Gateway Index Plus     3.03%      9.63%   27.65%     51.10%   149.06%      518.35%

S&P 500                4.49      26.00    61.08     107.59    263.57

Lehman Gov't/
 Corp. Bond            0.47       4.66    16.29      50.24    124.25

U. S. Inflation (CPI)  0.67       2.79     8.55      15.26     43.25
</TABLE>

Performance data throughout this report represents past performance. The average
annual total return figures assume the reinvestment of dividends. Your
investment return and principal value of an investment will fluctuate so that
your shares, when redeemed, may be worth more or less than the original cost.

This report must be preceded or accompanied by a current prospectus.


1
<PAGE>   3
GATEWAY INDEX PLUS FUND
Letter from the Chairman

Dear Shareholder:

The stock market responded favorably to good corporate earnings in the first
half of 1996. In this optimistic environment, the Index Plus Fund portfolio
continued to make progress.

Consistent with our reduced-risk philosophy of management, the Fund utilized
hedging strategies throughout the first half of 1996. Hedging with call options
produces cash flows in exchange for the capital appreciation of the Fund's
stocks. These cash flows also serve to reduce declines during periods of
uncertainty. Hedging with put options serves as a safety net to help protect
assets in the event of a significant decline in the market in a short period of
time.

We are pleased to report that premium levels on call options have increased,
particularly during the second quarter. High premiums lead to more effective
hedging and better risk/adjusted rates of return. In the co-portfolio managers'
report on the following pages, Pete Thayer and Patrick Rogers explain the
benefits of hedging in greater detail. In the second half of 1996, Gateway's
management believes that its hedged portfolios are positioned to take full
advantage of the higher levels of premium cash flows that currently prevail.

Finally, I take great pleasure in announcing the appointment of R. S. Harrison
to The Gateway Trust Board of Trustees. Mr. Harrison is chairman of Baldwin
Piano & Organ Co. and serves as a director of several corporations. He brings a
wealth of financial and managerial skills with him and, on behalf of fellow
boardmembers and shareholders, I welcome him to the Board of Trustees.

Cordially,

/s/ Walter G. Sall

Walter G. Sall
Chairman


                                                                               2
<PAGE>   4
GATEWAY INDEX PLUS FUND
Co-Portfolio Managers' Report


The Gateway Index Plus Fund's total return for the twelve months ended June 30,
1996, was 9.63%. This compares to a total return of 4.66% for the Lehman
Government/Corporate Bond Index and 26.00% for the Standard and Poor's 500 Stock
Index over the same period.

For the six months ended June 30, 1996, the Gateway Index Plus Fund delivered a
total return of 4.80%. Other investment alternatives with a low risk profile
similar to the Fund did not produce competitive gains over the same time period.
The Lehman Government/ Corporate Bond Index declined by 1.88%; five-year U. S.
Treasury notes declined by 1.79% over this same time period.

The following two charts analyze the different components of the Index Plus
Fund's total return for the first two quarters of 1996, as well as for calendar
years 1990 through 1995.

                             GATEWAY INDEX PLUS FUND
                                      1996

<TABLE>
<CAPTION>
                                           1ST QTR.                    2ND QTR.
                                           --------                    --------
<S>                                         <C>                         <C>  
CONTRIBUTION OF STOCKS
    Performance of Stocks                    6.23%                       4.05%
    Dividends Earned                         0.54                        0.51
INTEREST EARNED                              0.02                        0.06
CONTRIBUTIONS OF OPTIONS
    Effect of Options:   Calls              (4.16)                      (0.48)
    Effect of Options:   Puts               (0.58)                      (0.78)
EFFECT OF FEES
    Fund Expenses                           (0.29)                      (0.29)
    Brokerage Commissions                   (0.04)                      (0.04)
                                            -----                       ----- 
        TOTAL RETURN                         1.72%                       3.03%
                                             ----                        ---- 
</TABLE>


3
<PAGE>   5
GATEWAY INDEX PLUS FUND
Co-Portfolio Managers' Reports


                             GATEWAY INDEX PLUS FUND

<TABLE>
<CAPTION>
                                    1990       1991      1992      1993      1994       1995
                                   -----      -----     -----     -----     -----      -----
<S>                                <C>        <C>       <C>       <C>       <C>       <C>   
CONTRIBUTION OF STOCKS
    Performance of Stocks          (5.74%)    24.18%     2.87%     8.27%    (0.19%)    33.02%
    Dividends Earned                3.63       3.25      2.90      2.51      2.80       2.53
INTEREST EARNED                     0.29       0.33      0.19      0.07      0.03       0.17
CONTRIBUTIONS OF
OPTIONS
    Effect of Options: Calls        8.85      (7.66)     4.24      1.48      4.19     (21.48)
    Effect of Options: Puts         4.94      (0.72)    (3.58)    (3.68)     0.00      (1.91)
EFFECT OF FEES
    Fund Expenses                  (1.33)     (1.22)    (1.11)    (1.11)    (1.21)     (1.19)
    Brokerage Commissions          (0.32)     (0.36)    (0.36)    (0.14)    (0.05)     (0.10)
                                   -----      -----     -----     -----     -----      ----- 
        TOTAL RETURN               10.32%     17.80%     5.15%     7.40%     5.57%     11.04%
                                   -----      -----     -----     -----     -----      ----- 
</TABLE>

STOCKS: The first two quarters of 1996 have remained quite favorable for stock
investments. Our blue chip portfolio of one hundred stocks participated in this
favorable environment.

DIVIDENDS EARNED: The declining trend in dividend yield continued thus far in
1996. This is not due to corporations cutting their dividend payments; rather,
it is a result of underlying stock prices rising faster than dividend payments.
As stock prices rise, the dividend yield, expressed as a percentage of the stock
price, has declined.

INTEREST EARNED: As is normally the case, the Index Plus Fund is nearly always
100% invested in stocks. Therefore, the interest earned on cash in the Fund is
quite low.


                                                                               4
<PAGE>   6
GATEWAY INDEX PLUS FUND
Co-Portfolio Managers' Reports

EFFECT OF CALL OPTIONS: The Fund always sells index call options on its entire
portfolio of stocks. By selling call options, the Index Plus Fund receives a
cash flow in exchange for any price appreciation on our one hundred stocks.
Recently this cash flow has risen quite dramatically to approximately 15% to 16%
annualized, or 3.75% to 4.00% per quarter. In down, flat, or moderately-rising
stock markets, the call option component will add to the total return of the
Fund (e.g., 1990, 1992, 1993, 1994). If stock prices rise by more than this cash
flow, then the call option component will take away from performance (e.g.,
1991, 1995, and year-to-date 1996). This combination of selling call options and
owning stocks produces a fairly consistent pattern of total returns and,
therefore, reduces overall risk.

EFFECT OF PUT OPTIONS: As we have stated in the past, buying put options on our
portfolio of stocks is similar to purchasing an insurance policy on your home --
it serves as a measure of protection from a significant decline in a short
period of time. Since our asset (stocks) did not decline over the past two
quarters, the put option protection was a "cost" to the Fund. Remember, we do
not buy put options with the hope that the market will go down any more than the
homeowner purchases a fire insurance policy with the wish that his house will
burn down. Rather, at times of high risk, we want put option contracts in place
to provide some protection against a major decline in value.

FUND EXPENSES: The expense ratio during the first six months of the year,
including all management fees, was 0.58%.

BROKERAGE COMMISSIONS: Since the Index Plus Fund "buys and holds" the stocks in
the portfolio, the Fund has extremely low turnover in its holdings. A great
benefit to this investment strategy is its low commission cost, as demonstrated
in the first half of 1996.


5
<PAGE>   7
GATEWAY INDEX PLUS FUND
Co-Portfolio Managers' Report


As we reported in the First Quarter Report '96, the risk/reward profile has
improved dramatically for the Index Plus Fund. Currently, selling call options,
in addition to receiving stock dividends, is producing a higher cash flow than
has been seen over the past four years. This generous cash flow suggests that
the Index Plus Fund provides not only an opportunity for improved total returns,
but also reduces the risk of owning stocks. Should the stock market begin to
change course, this cash flow can serve to replace capital that would otherwise
decline.

Within the confines of a limited exposure to risk, the current combination of
high cash flows from calls and protection from puts provides an excellent profit
opportunity to shareholders of the Index Plus Fund. We look forward to the
second half of 1996 with enthusiasm!

/s/ J. Patrick Rogers

J. Patrick Rogers, CFA
Co-Portfolio Manager

/s/ Peter W. Thayer

Peter W. Thayer, CFA
Co-Portfolio Manager


                                                                               6
<PAGE>   8
GATEWAY INDEX PLUS FUND
Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
Shares            Common Stocks                  Value
- ------            -------------                  -----
<S>        <C>                                   <C>
           UTILITIES  10.86%
 14,900    American Electric Power Co.           $   635,113
 44,400    Ameritech                               2,636,250
128,500    AT&T Corporation                        7,983,063
 35,000    Bell Atlantic Corp.                     2,231,250
 18,200    Entergy Corp.                             517,563
 55,100    MCI Communications Corp.                1,408,494
 35,000    Nynex Corporation                       1,662,500
 53,600    Southern Co.                            1,316,550
 17,200    UNICOM Corp.                              479,450
                                                 -----------
                                                  18,870,233
                                                 -----------
           ENERGY  11.80%
 39,700    Amoco Corp.                             2,873,288
 12,900    Atlantic Richfield Co.                  1,528,650
 11,600    Baker Hughes, Inc.                        382,075
  8,500    Coastal Corp.                             354,875
 99,300    Exxon Corp.                             8,632,894
  9,300    Halliburton Co.                           516,731
 31,500    Mobil Corp.                             3,531,938
 25,500    Occidental Petroleum Corp.                632,719
 19,400    Schlumberger Ltd.                       1,635,663
  8,300    Williams Companies                        410,850
                                                 -----------
                                                  20,499,683
                                                 -----------
           FINANCE  8.56%
 38,600    American Express                        1,720,113
 16,700    American General Corp.                    612,681
 37,900    American International Group, Inc.      3,735,519
 29,300    BankAmerica Corp.                       2,217,644
  6,100    CIGNA Corp.                               718,275
 38,900    Citicorp                                3,214,113
 25,300    First Chicago NBD Corp.                   991,444
 11,100    Great Western Financial Corp.             266,400
  9,400    ITT Hartford Group Inc.                   499,963
 13,700    Merrill Lynch & Co.                       892,213
                                                 -----------
                                                  14,868,365
                                                 -----------
</TABLE>

                 See accompanying notes to financial statements


7
<PAGE>   9
GATEWAY INDEX PLUS FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
Shares              Common Stocks                         Value
- ------              -------------                         -----
<S>       <C>                                         <C>        
          INDUSTRIAL CYCLICALS  15.09%
14,100    Aluminum Company of America                 $   809,869
 9,500    Bethlehem Steel Corporation *                   112,219
 7,000    Black & Decker Manufacturing Corp.              269,500
27,700    Boeing Company                                2,415,094
 3,900    Boise Cascade Corp.                             143,081
 8,100    Brunswick Corp.                                 162,000
 7,700    Champion International Corporation              320,513
20,000    Dow Chemical Company                          1,520,000
44,800    DuPont E.I. de Nemours                        3,544,800
27,700    Eastman Kodak Company                         2,151,944
 6,800    Fluor Corp.                                     444,125
 5,100    General Dynamics Corp.                          316,519
40,800    Hewlett Packard Company                       4,062,150
11,700    Homestake Mining Corp.                          199,631
 9,000    International Flavors & Fragrances, Inc.        428,063
23,900    International Paper Company                     882,806
33,400    Minnesota Mining and Manufacturing            2,302,513
47,300    Monsanto Company                              1,534,294
 3,600    Polaroid Corp.                                  164,475
17,400    Rockwell International Corp.                    996,150
 4,700    Teledyne, Inc.                                  169,788
14,500    Unisys Corp. *                                  102,406
 9,700    United Technologies Corp.                     1,115,500
15,900    Weyerhauser Co.                                 675,750
25,900    Xerox Corp.                                   1,384,031
                                                      -----------
                                                       26,227,221
                                                      -----------
          CONSUMER DURABLES  4.64%
29,900    Chrysler Corporation                          1,857,538
94,000    Ford Motor Company                            3,043,250
60,500    General Motors Corp.                          3,168,688
                                                      -----------
                                                        8,069,476
                                                      -----------
</TABLE>

                 See accompanying notes to financial statements


                                                                               8
<PAGE>   10
GATEWAY INDEX PLUS FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
Shares            Common Stocks                 Value
- ------            -------------                 -----
<S>        <C>                               <C>        
           CONSUMER STAPLES  9.85%
 10,700    Avon Products, Inc.               $   482,838
199,600    Coca-Cola Co.                       9,767,925
 11,700    Colgate Palmolive Company             992,306
 29,600    Heinz (H. J.) Co.                     899,100
125,300    PepsiCo, Inc.                       4,440,319
  8,600    Ralston Purina Co.                    552,550
                                             -----------
                                              17,135,038
                                             -----------
           SERVICES  5.08%
 12,200    Burlington Northern, Inc.             986,675
  4,200    Delta Air Lines, Inc.                 348,338
  4,500    Federal Express *                     369,000
  8,300    Harrah's Entertainment, Inc. *        234,475
 56,000    McDonald's Corp.                    2,614,500
 10,200    Norfolk Southern Corp.                864,450
 54,200    Walt Disney Productions             3,404,438
                                             -----------
                                               8,821,876
                                             -----------
           RETAIL  5.08%
 37,400    K-Mart Corp. *                        460,488
 20,000    May Department Stores Company         875,000
 31,400    Sears, Roebuck & Company            1,528,788
  4,800    Tandy Corp.                           227,400
 21,700    The Limited, Inc.                     465,194
 21,900    Toys R Us *                           622,781
183,400    Wal-Mart Stores, Inc.               4,642,313
                                             -----------
                                               8,821,964
                                             -----------
           HEALTH  11.64%
 21,700    Baxter International                1,025,325
 40,200    Bristol-Myers Squibb Company        3,612,975
 35,800    Columbia Healthcare Corp.           1,913,063
106,600    Johnson & Johnson                   5,283,363
  6,000    Mallinckrodt Group, Inc.              233,250
 98,200    Merck & Company                     6,346,175
 40,700    Pharmacia & Upjohn                  1,806,063
                                             -----------
                                              20,220,214
                                             -----------
</TABLE>

                 See accompanying notes to financial statements


9
<PAGE>   11
GATEWAY INDEX PLUS FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
Shares                Common Stocks                       Value
- ------                -------------                       -----
<S>        <C>                                       <C>         
           TECHNOLOGY  17.84%
 17,400    AMP, Inc.                                 $    698,175
  5,500    Ceridian Corporation *                         278,094
 44,900    Cisco Systems Inc. *                         2,545,269
  4,500    Computer Sciences Corp. *                      336,094
 12,200    Digital Equipment Corp. *                      549,000
133,000    General Electric Company                    11,496,169
  3,100    Harris Corp.                                   188,713
 10,100    Honeywell, Inc.                                549,819
 65,700    Intel Corporation                            4,824,844
 43,500    International Business Machines Corp.        4,309,219
 11,000    National Semiconductor Corp. *                 171,188
 20,600    Northern Telecom Ltd.                        1,121,413
 52,350    Oracle Corporation *                         2,064,553
 19,100    Raytheon Company                               988,425
  2,600    Tekronix, Inc.                                 116,188
 15,300    Texas Instruments, Inc.                        764,044
                                                     ------------
                                                       31,001,207
                                                     ------------
           TOTAL COMMON STOCKS  100.44%               174,535,277
           (cost $119,254,441)                       ------------
</TABLE>

                 See accompanying notes to financial statements


                                                                              10
<PAGE>   12
GATEWAY INDEX PLUS FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
Contracts                                                                   Value
- ---------                                                                   -----
<S>      <C>                                                            <C>         
         PUT OPTION ON THE STANDARD & POOR'S 100 STOCK INDEX  0.12%
1,500    expiring August 16, 1996 at 590                                $    210,945
         (cost $642,750)

         REPURCHASE AGREEMENT 2.95%
         5% repurchase agreement dated June 28, 1996 with Star
         Bank, N.A., due July 1, 1996 (repurchase proceeds
         $5,124,134), collateralized by $5,440,000 
         6% GNMA Pool #8974, maturity May 20, 2022
         (market value $5,508,000)                                         5,122,000
                                                                        ------------
         TOTAL INVESTMENTS AND REPURCHASE AGREEMENT  103.51%             179,868,222
                                                                        ------------

         CALL OPTIONS ON THE STANDARD & POOR'S 100 STOCK INDEX **

 (305)   expiring July 19, 1996 at 620                                      (960,750)
 (410)   expiring July 19, 1996 at 630                                      (945,563)
 (204)   expiring July 19, 1996 at 650                                      (169,575)
 (194)   expiring August 16, 1996 at 640                                    (383,150)
 (286)   expiring August 16, 1996 at 650                                    (378,950)
  (97)   expiring September 16, 1996 at 650                                 (178,238)
 (599)   expiring September 20, 1996 at 630                               (1,924,286)
 (599)   expiring September 20, 1996 at 640                               (1,504,988)
                                                                        ------------
         TOTAL CALL OPTIONS OUTSTANDING  (3.71%)                          (6,445,500)
         (premiums received $6,157,603)

         OTHER ASSETS AND LIABILITIES, NET 0.20%                             344,488
                                                                        ------------
         NET ASSETS  100%                                               $173,767,210
                                                                        ============
</TABLE>

         *   Denotes a non-income producing security.

         **  The aggregate value of investments that covers
             outstanding call options is $174,535,277.

                 See accompanying notes to financial statements


11
<PAGE>   13
GATEWAY INDEX PLUS FUND
Statement of Assets and Liabilities - June 30, 1996 (unaudited)

<TABLE>
<S>                                                                      <C>          
ASSETS:
Common stocks, at value (original cost $119,254,441)                     $ 174,535,277
Put options, at value (original cost $642,750)                                 210,945
Repurchase agreement                                                         5,122,000
Dividend and interest receivable                                               275,910
Receivable for fund shares sold                                                230,449
Cash                                                                               985
Other assets                                                                    53,690
                                                                         -------------
                                                                           180,429,256
                                                                         -------------
LIABILITIES:
Call options outstanding, at value
   (premiums received $6,157,603)                                            6,445,500
Payable for fund shares redeemed                                                86,354
Dividends payable to shareholders                                               78,042
Other accrued expenses and liabilities                                          52,150
                                                                         -------------
                                                                             6,662,046
                                                                         -------------
NET ASSETS                                                               $ 173,767,210
                                                                         =============
NET ASSETS CONSIST OF:

Paid-in capital applicable to 9,859,347 shares outstanding
   (unlimited number of shares authorized, no par value)                 $ 141,738,391
Accumulated realized loss, net                                             (22,532,315)
Unrealized appreciation, net                                                54,561,134
                                                                         -------------
                                                                         $ 173,767,210
                                                                         =============
NET ASSET VALUE, OFFERING, AND REDEMPTION
   PRICE PER SHARE                                                       $       17.62
                                                                         =============
</TABLE>

                 See accompanying notes to financial statements


                                                                              12
<PAGE>   14
GATEWAY INDEX PLUS FUND
Statement of Operations - For the Six Months Ended June 30, 1996 (unaudited)


<TABLE>
<S>                                                                            <C>         
INVESTMENT INCOME:
Dividend income                                                                $  1,852,435
Interest income                                                                     140,556
                                                                               ------------
                                                                                  1,992,991
                                                                               ------------
EXPENSES:
Investment advisory and management fees                                             624,356
Transfer agent and accounting fees                                                  196,775
Reports to shareholders                                                              64,886
Professional fees                                                                    41,542
Trustees' fees                                                                       14,415
Registration fees                                                                    12,133
Custodian fees                                                                        9,891
Other expenses                                                                       43,158
                                                                               ------------
                                                                                  1,007,156
                                                                               ------------
NET INVESTMENT INCOME                                                               985,835
                                                                               ------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Realized gain (loss) on investments:
   Securities                                                                    12,876,804
   Call options expired and closed                                               (8,673,249)
   Put options expired and closed                                                (2,204,087)
                                                                               ------------
     Net realized gain on investments                                             1,999,468
                                                                               ------------
Change in unrealized appreciation (depreciation) of investments:
   Securities                                                                     4,958,211
   Call options                                                                     345,156
   Put options                                                                       (5,014)
                                                                               ------------
     Change in net unrealized appreciation (depreciation) of investments          5,298,353
                                                                               ------------
NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS                                   7,297,821
                                                                               ------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                           $  8,283,656
                                                                               ============
</TABLE>

                 See accompanying notes to financial statements


13
<PAGE>   15
GATEWAY INDEX PLUS FUND
Statements of Changes in Net Assets (unaudited)


<TABLE>
<CAPTION>
                                                                     Six Months Ended       Year Ended
                                                                      June 30, 1996      December 31, 1995
                                                                      -------------        -------------
<S>                                                                   <C>                  <C>          
FROM OPERATIONS:
Net investment income                                                 $     985,835        $   2,626,376
Net realized gain (loss) on investments                                   1,999,468          (23,126,218)
Change in unrealized appreciation (depreciation) of investments           5,298,353           38,629,096
                                                                      -------------        -------------
Net increase in net assets resulting from operations                      8,283,656           18,129,254
                                                                      -------------        -------------
DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS:
From net investment income                                                 (994,199)          (2,626,376)
In excess of realized gains on investments                                       --             (249,721)
                                                                      -------------        -------------
Decrease in net assets from dividends and distributions                    (994,199)          (2,876,097)
                                                                      -------------        -------------
FROM FUND SHARE TRANSACTIONS:
Proceeds from shares sold                                                34,944,688           38,274,968
Net asset value of shares issued in reinvestment of
               dividends and distributions                                  864,852            2,637,064
Payments for shares redeemed                                            (45,551,439)         (44,596,352)
                                                                      -------------        -------------
Net decrease in net assets from fund shares transactions                 (9,741,899)          (3,684,320)
                                                                      -------------        -------------
NET INCREASE (DECREASE) IN NET ASSETS                                    (2,452,442)          11,568,837

NET ASSETS:
Beginning of period                                                     176,219,652          164,650,815
                                                                      -------------        -------------
End of period                                                         $ 173,767,210        $ 176,219,652
                                                                      =============        =============
FUND SHARE TRANSACTIONS:
Shares sold                                                               2,019,818            2,357,484
Shares issued in reinvestment of dividends and distributions                 49,787              160,498
Less shares redeemed                                                     (2,633,229)          (2,733,507)
                                                                      -------------        -------------
NET DECREASE IN SHARES OUTSTANDING                                         (563,624)            (215,525)
                                                                      =============        =============
</TABLE>

                 See accompanying notes to financial statements


                                                                              14
<PAGE>   16
GATEWAY INDEX PLUS FUND
Financial Highlights (unaudited)


<TABLE>
<CAPTION>
                                               Six Months
                                             Ended June 30,                 Year ended December 31,
                                                  1996          1995       1994       1993       1992      1991
                                                -------       -------    -------    -------    -------    ------
<S>                                             <C>           <C>        <C>        <C>        <C>        <C>   
Net asset value, beginning of period            $ 16.91       $ 15.48    $ 15.85    $ 15.51    $ 15.24    $13.64
                                                -------       -------    -------    -------    -------    ------
Net investment income                              0.10          0.24       0.26       0.26       0.27      0.31
Net gains or losses on securities                  0.71          1.46       0.61       0.88       0.51      2.10
                                                -------       -------    -------    -------    -------    ------
   Total from investment operations                0.81          1.70       0.87       1.14       0.78      2.41
                                                -------       -------    -------    -------    -------    ------
Dividends from net investment income              (0.10)        (0.24)     (0.27)     (0.26)     (0.28)    (0.30)
Distributions from capital gains                   0.00          0.00      (0.86)     (0.47)     (0.23)    (0.51)
Distributions in excess of realized
   capital gains                                   0.00         (0.03)     (0.11)     (0.07)      0.00      0.00
                                                -------       -------    -------    -------    -------    ------
   Total distributions                            (0.10)        (0.27)     (1.24)     (0.80)     (0.51)    (0.81)
                                                -------       -------    -------    -------    -------    ------ 
Net asset value, end of period                  $ 17.62       $ 16.91    $ 15.48    $ 15.85    $ 15.51    $15.24
                                                -------       -------    -------    -------    -------    ------
TOTAL RETURN                                       4.80%(1)     11.04%      5.57%      7.40%      5.15%    17.80%

Net assets, end of period (millions)            $173.77       $176.22    $164.65    $207.18    $212.95    $81.37

Ratio of expenses to average net assets            1.15%(2)      1.19%      1.21%      1.11%      1.11%     1.22%

Ratio of net investment income to average
   net assets                                      1.12%(2)      1.51%      1.54%      1.58%      1.96%     2.17%

Portfolio turnover rate                              10%(1)         5%         4%        17%        15%       31%

Average commission per share (3)                $  0.03           n/a        n/a        n/a        n/a       n/a
</TABLE>

(1)  Not annualized.
(2)  Annualized.
(3) Pursuant to new reporting requirements, average commission per share is
presented for 1996.

                 See accompanying notes to financial statements


15
<PAGE>   17
NOTES TO FINANCIAL STATEMENTS
June 30, 1996 (unaudited)


1.  SIGNIFICANT ACCOUNTING POLICIES
The Gateway Trust (the Trust) is a family of four no-load diversified mutual
funds. The financial statements of Gateway Index Plus Fund (Index or the Fund)
are included in this report. Gateway Mid Cap Index Fund, Gateway Small Cap Index
Fund, and Cincinnati Fund are included in separate semi-annual reports. The
Trust is registered under the Investment Company Act of 1940.

The following is a summary of the Fund's significant accounting policies.

INVESTMENTS VALUATION - The Fund normally values common stocks and option
contracts (both purchased and written) at the average of the closing bid and
asked quotations. Other securities for which market quotations are not readily
available are valued at fair value as determined in good faith under procedures
adopted by the board of trustees.

INVESTMENT TRANSACTIONS, INVESTMENT INCOME, AND EXPENSES - Investment
transactions are recorded on the trade date. Dividend income is recorded on the
ex-dividend date, and interest income is accrued daily. Capital gains and losses
are calculated on an identified cost basis. Expenses that cannot be directly
associated with a specific Trust fund are allocated under policies set by the
board of trustees.

DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS TO SHAREHOLDERS - Dividends from net
investment income are recorded on the ex-dividend date and are declared and paid
quarterly. Net realized capital gains, if any, are distributed to shareholders
in December.

FEDERAL INCOME TAXES - The Fund intends to comply with the provisions of
Subchapter M of the Internal Revenue Code applicable to regulated investment
companies and distribute substantially all of its taxable income to the
shareholders. Based on this policy, the Fund makes no provision for income
taxes. The cost of investments is the same for financial reporting and tax
purposes. Tax regulations require the Fund to assume that open option contracts
are closed each year end and include the resulting calculated capital gain or
loss in the determination of federal taxable income. The Fund has a net capital
loss carryforward of $25,549,652 that expires in 2003.

REPURCHASE AGREEMENTS - The Fund requires the custodian to hold sufficient
collateral to secure repurchase agreements. To reduce the chance of loss in its
repurchase transactions, the Fund enters into repurchase agreements only with
banks that have more than $1 billion in assets and are creditworthy in the
judgment of Gateway Investment Advisers, L.P. (the Adviser).

2.  TRANSACTIONS WITH AFFILIATES
Gateway Investment Advisers, Inc. (GIA) was the investment adviser of the Fund
prior to December 15, 1995. On December 15, 1995, the advisory contract between
the Fund and GIA terminated, and a new contract was entered into with the
Adviser. There were no changes in the advisory fee, or the computation thereof,
as a result of the new contract. Index pays the Adviser a monthly management fee
computed at an annual rate of 0.90% of the first $50 million of the average
daily net assets of the Fund, 0.70% of the next $50 million, and 0.60% of all
such assets over $100 million.


                                                                              16
<PAGE>   18
NOTES TO FINANCIAL STATEMENTS
June 30, 1996 (unaudited)


If total expenses for any fiscal year (excluding taxes, interest, brokerage
commissions, and expenses of an extraordinary nature) exceed 1.50% of the
average daily net assets, the Adviser has agreed to reduce its fee as necessary
to limit the Fund's expenses to that level.

The Adviser maintains the Fund's accounting records for a monthly fee of $4,000.
The Adviser also provides shareholder servicing, transfer, and dividend
disbursing agent services for the Trust. The Fund reimburses the Adviser for the
cost to provide these services subject to a minimum monthly fee of $2,500 and a
limitation of 0.20% of average daily net assets.

Each trustee of the Trust who is not affiliated with the Adviser receives an
annual retainer of $3,000, a $500 base fee plus $100 per fund for each meeting
attended, and $200 per fund ($1,000 per fund for the committee chairman) for
each committee meeting attended. The annual retainer and base fee are allocated
among the funds based on the number of shareholders in each fund.

At June 30, 1996, the Adviser held in a fiduciary capacity 8.10% of the
outstanding shares of the Fund.

3.  SECURITIES TRANSACTIONS
For the six months ended June 30, 1996, purchases of investment securities
(excluding short-term investments) totaled $18,239,424 and proceeds from sales
totaled $38,817,948.

The Fund may write (sell) call options on stock indexes for cash (that is, "the
option premium") to enhance earnings on the portfolio securities. However, using
these contracts limits the opportunity to participate in appreciation of the
underlying portfolio beyond certain upper limits set by the contracts. The Fund
may also buy put options on stock indexes. The purchase of put options involves
the risk of loss of all or part of the cash paid for the put options. The
liability recorded upon receipt of written option premiums increases to offset
rises and decreases to offset declines in the market value of the hedged
portfolio. Similarly, the value of purchased puts increases to offset declines
and decreases to offset rises in portfolio value. For the six months ended June
30, 1996, transactions in written options were as follows:

                                       Number of Contracts    Premiums
                                       -------------------    --------
       Outstanding at December 31, 1995        3,044        $  5,616,247
       Options written                         8,790          16,000,199
       Options exercised                      (9,140)        (15,458,843)
                                              ------         ----------- 
       Outstanding at June 30, 1996            2,694        $  6,157,603
                                              ======        ============

4.  UNREALIZED APPRECIATION (DEPRECIATION) ON INVESTMENTS
Gross unrealized appreciation of common stock totaled $56,692,981 and
depreciation totaled ($1,412,145) at June 30, 1996, based on the cost of
investments.


17
<PAGE>   19
THE GATEWAY TRUST

                               Investment Adviser:
                        Gateway Investment Advisers, L.P.

                             Shareholder Servicing:
                        Gateway Investment Advisers, L.P.

                                    Auditors:
                               Arthur Andersen LLP
                                 Cincinnati, OH

                                   Custodian:
                                 Star Bank, N.A.
                                 Cincinnati, OH

                                    Trustees:
                               Stefen F. Brueckner
                               Kenneth A. Drucker
                                Beverly S. Gordon
                                 R. S. Harrison
                                  John F. Lebor
                                 Walter G. Sall
                              William H. Schneebeck
                                 Peter W. Thayer


                                                                              18
<PAGE>   20
                                RISK/REWARD CHART

                                    TEN YEARS
                               6/30/86 to 6/30/96

<TABLE>
<CAPTION>
                                                     Risk      Return
                                                     ----      ------
<S>                                                 <C>         <C>  
             U. S. Treasury bills (30 day)           0.50        5.34%
                Gateway Index Plus Fund              7.90        9.55%
                  S&P 500 Stock Index               14.05       13.78%
</TABLE>


           The above chart shows that, in general, more risk must be taken to
           earn higher total returns. The chart shows three points. One point
           shows 30-day U. S. Treasury bills, one point shows the S&P 500 Index,
           and the third point shows the Index Plus Fund. The line connecting
           Treasury bills and the S&P 500 Index shows all the possible outcomes
           if an investment had been allocated between these two choices in
           varying positions. When the Index Plus Fund point appears above the
           line, it shows that the Fund earned a higher-than-expected return
           during the period covered by the chart, considering the amount of
           risk it took to earn that return. If the point appears below the
           line, it shows the reverse. The succeeding years may be quite
           different in terms of reward for all three investments shown on the
           chart. The risk, however, tends to be constant over time.
<PAGE>   21
August 6, 1996






Dear              :

We are pleased to enclose your Semi-Annual Report on the Index Plus Fund. The
report provides portfolio values as of June 30, 1996, and comparative rates of
return for the twelve-month, six-month, and three-month periods ending at
mid-year. The second quarter of 1996 marks the eighth consecutive quarter of
gains from your fund.

Please focus attention on the Co-Portfolio Managers' Report on pages 3 through
6. Pete Thayer and Patrick Rogers, co-portfolio managers, discuss stock market
returns, the effects of risk-reducing hedging transactions, dividend
distributions, and fund operating expenses. It is the combination of these
factors that gives the Index Plus Fund the low risk profile that has been its
trademark for many years.

On behalf of the entire staff at Gateway, we appreciate the confidence you have
placed with us. We look forward to continuing to help you meet your investment
goals!

Cordially,

/s/ Walter G. Sall

Walter G. Sall
Chairman
<PAGE>   22
                         [insert Statue of Liberty logo]




                                     GATEWAY
                               MID CAP INDEX FUND
                                       AND
                              SMALL CAP INDEX FUND




                             SEMI-ANNUAL REPORT 1996
<PAGE>   23
GATEWAY MID CAP INDEX AND SMALL CAP INDEX FUNDS
Highlights at June 30,1996

<TABLE>
<CAPTION>
                                                               AVERAGE ANNUAL TOTAL RETURN
                             ----------------------------------------------------------------------------------------------------
                               Past         One         Three        Five           Ten        Since     Inception        Price
                             Quarter        Year        Years        Years         Years     Inception     Date         Per Share
                             -------        ----        -----        -----         -----     ---------     ----         ---------

<S>                            <C>          <C>         <C>           <C>          <C>          <C>       <C>             <C>    
   Gateway Mid Cap Index       1.55%        16.61%      9.86%           n/a          n/a        8.47%     9/30/92         $12.47

   Gateway Small Cap Index     3.18         17.83       9.48            n/a          n/a        9.72      6/16/93         $12.01

   S&P MidCap 400 Index        2.88         21.59      14.13          16.68          n/a

   Wilshire Small Cap Index    3.86         20.95      14.40            n/a          n/a

   S&P 500 Stock Index         4.49         26.00      17.22          15.73        13.78

   Lehman Gov't/Corp. Bond     0.47          4.66       5.16           8.48         8.41

   U. S. Inflation (CPI)       0.67          2.79       2.77           2.88         3.66
</TABLE>


<TABLE>
<CAPTION>
                                                                     CUMULATIVE TOTAL RETURN
                                          ------------------------------------------------------------------------------
                                           Past           One       Three         Five            Ten            Since
                                          Quarter        Year       Years        Years           Years         Inception
                                          -------        ----       -----        -----           -----         ---------

<S>                                         <C>         <C>        <C>           <C>            <C>             <C>   
   Gateway Mid Cap Index                    1.55%       16.61%     32.60%           n/a            n/a          35.66%

   Gateway Small Cap Index                  3.18        17.83      31.24            n/a            n/a          32.55

   S&P MidCap 400 Index                     2.88        21.59      48.68         116.30            n/a

   Wilshire Small Cap Index                 3.86        20.95      49.72            n/a            n/a

   S&P 500 Stock Index                      4.49        26.00      61.08         107.59         263.57

   Lehman Gov't/Corp. Bond                  0.47         4.66      16.29          50.24         124.25

   U. S. Inflation (CPI)                    0.67         2.79       8.55          15.26          43.25
</TABLE>

Performance data throughout this report represents past performance. The average
annual total return figures assume the reinvestment of dividends. Your
investment return and principal value of an investment will fluctuate so that
your shares, when redeemed, may be worth more or less than the original cost.

      This report must be preceded or accompanied by a current prospectus.


                                                                               1
<PAGE>   24
GATEWAY MID CAP INDEX AND SMALL CAP INDEX FUNDS
Letter from the Chairman


Dear Shareholder:

The small capitalization and middle capitalization sectors rebounded vigorously
in the first half of 1996. Responding to improved corporate earnings, companies
in these classifications attracted investor attention.

Each of your Gateway growth sector portfolios made excellent progress in the
first half of 1996. In the portfolio managers' report on the following pages,
Pete Thayer and Patrick Rogers explain the market fundamentals affecting the
returns earned in these funds.

Finally, I take great pleasure in announcing the appointment of R. S. Harrison
to The Gateway Trust Board of Trustees. Mr. Harrison is chairman of Baldwin
Piano & Organ Co. and serves as a director of several corporations. He brings a
wealth of financial and managerial skills with him, and, on behalf of fellow
boardmembers and shareholders, I welcome him to the Board of Trustees.

Cordially,

/s/ Walter G. Sall
- -----------------------
Walter G. Sall
Chairman


Co-Portfolio Managers' Report

Due mainly to an impressive first quarter, the Gateway Mid Cap Index and Small
Cap Index Funds produced strong results during the first half of 1996, earning
total returns of 7.41% and 8.69%, respectively. For the trailing twelve months
ended June 30, 1996, the Mid Cap Index and Small Cap Index Funds produced total
returns of 16.61% and 17.83%, respectively.

Extending the tremendous gains from 1995, the first six months of 1996 remained
quite favorable for the U. S. equity markets. However, while the economy
increased significantly during the first half of 1996, the growth rate in
corporate profits slowed down from their outstanding gains in 1995. Despite this
slowdown, the stock market continued to set all-time highs. The S&P 500 Stock
Index produced a total return of 10.10% during this same time period.

The Gateway Mid Cap Index Fund invests in the same 400 stocks as the S&P MidCap
400 Index. As the name implies, the common stocks which populate the portfolio
are middle-sized companies with a market capitalization range from $168 million
to $8.4 billion. Typically, these companies are established firms still within
the growth phase of their business lines. The portfolio is extremely diversified
across twenty-three industry groups with the largest weighting of 14.90% in
utilities.
                                                                               2
<PAGE>   25
GATEWAY MID CAP INDEX AND SMALL CAP INDEX FUNDS
Co-Portfolio Managers' Report


The Gateway Small Cap Index Fund invests in the 250 stocks represented in the
Wilshire 250 Small Cap Index. Once again as the name suggests, the stocks in
this index are the smaller, younger companies which are experiencing higher
growth rates. The weighted average market capitalization for this portfolio is
$769 million. Similar to the Mid Cap Index Fund, the Small Cap Index Fund is
broadly diversified among twenty-two industry groups. The largest sector is
finance, insurance, and real estate at 18.05%.

With a strong market environment in place over the past eighteen months, our
proprietary computer model, the Put/RA Factor, measured over 300 consistently
during the second quarter of 1996. At this level, we become cautious toward the
equity market. Consequently, we lowered the risk of the Mid Cap Index and Small
Cap Index Funds by hedging with put options. We do not purchase put options
because we wish or expect the market to decline, but rather to protect assets
should a significant decline occur in the market in a short period of time. If a
decline in stock prices does not occur, the cost of put options reduces the
total return by the amount paid for the protection. In the first half of 1996,
this protection cost the Mid Cap Index and Small Cap Index Funds 0.85% and
0.80%, respectively.

Economic news remains favorable at the end of the second quarter. Investors have
become aware, however, that a strong economy typically leads to increased
inflation. The Federal Reserve Board may increase interest rates should this
occur. An increase in interest rates certainly would make the stock market
vulnerable to a sell-off. To this point, there remains a lack of proof that
inflation has risen.

Nevertheless, nervousness pervades in the financial markets. This sentiment has
increased, and will continue to increase, the daily volatility of the markets.
As such, we feel it is prudent to selectively own put options during this
environment.

A longer-term view of the financial markets suggests the middle capitalization
and smaller capitalization sectors will continue to provide outstanding
opportunities for investors. As always, we appreciate that you have selected
Gateway to take advantage of such opportunities to fulfill your investment
goals.

/s/J. P. Rogers
- ----------------------
J. Patrick Rogers, CFA
Co-Portfolio Manager

/s/Peter W. Thayer
- ----------------------
Peter W. Thayer, CFA
Co-Portfolio Manager


                                                                               3
<PAGE>   26
GATEWAY MID CAP INDEX FUND                                                      
Co-Portfolio Managers' Overview                                                 

<TABLE>
<CAPTION>
                                                GATEWAY MID CAP INDEX FUND
                                                         1996
                                            -------------------------------
                                            1ST QTR.                2ND QTR.
                                            --------                --------

<S>                                           <C>                     <C>  
    CONTRIBUTION OF STOCKS
       Performance of Stocks                  5.88%                   2.42%
       Dividends Earned                       0.42                    0.39
    INTEREST EARNED                           0.05                    0.04
    CONTRIBUTIONS OF OPTIONS
       Effect of Options:   Calls             0.00                    0.00
       Effect of Options:   Puts             (0.06)                  (0.79)
    EFFECT OF FEES
       Fund Expenses                         (0.50)                  (0.50)
       Brokerage Commissions                 (0.02)                  (0.01)
                                             -----                   ----- 

          TOTAL RETURN                        5.77%                   1.55%
                                             =====                   ===== 
</TABLE>

<TABLE>
<CAPTION>
                      TOP TEN HOLDINGS
                 GATEWAY MID CAP INDEX FUND
                     AS OF JUNE 30, 1996
                 --------------------------

<S>                                                <C>  
Hospitality Franchise Systems                      1.26%
U. S. Robotics                                     1.12%
Thermo Electron Corporation                        0.90%
HEALTHSOUTH Rehabilitation Corp.                   0.86%
Parametric Technology Corporation                  0.85%
Mirage Resorts Incorporated                        0.79%
Seagate Technology, Inc.                           0.74%
Coca-Cola Enterprises, Inc.                        0.73%
Cardinal Health, Inc.                              0.71%
Frontier Corp.                                     0.70%
</TABLE>


GATEWAY SMALL CAP INDEX FUND  
Co-Portfolio Manager's Overview


<TABLE>
<CAPTION>
                            GATEWAY SMALL CAP INDEX FUND
                                        1996

                                            1ST QTR.                2ND QTR.
                                            --------                --------
<S>                                           <C>                     <C>  
    CONTRIBUTION OF STOCKS
       Performance of Stocks                  5.46%                   3.92%
       Dividends Earned                       0.38                    0.35
    INTEREST EARNED                           0.02                    0.04
    CONTRIBUTIONS OF OPTIONS
       Effect of Options:   Calls             0.00                    0.00
       Effect of Options:   Puts             (0.09)                  (0.71)
    EFFECT OF FEES
       Fund Expenses                         (0.41)                  (0.37)
       Brokerage Commissions                 (0.02)                  (0.05)
                                             -----                   ----- 

          TOTAL RETURN                        5.34%                   3.18%
                                             =====                   ===== 
</TABLE>

<TABLE>
<CAPTION>
                      TOP TEN HOLDINGS
                GATEWAY SMALL CAP INDEX FUND
                     AS OF JUNE 30, 1996

<S>                                                <C>  
Shared Medical Systems Corporation                 0.87%
Nabors Industries, Inc.                            0.84%
First Commerce Corp. of Louisiana                  0.82%
Comdisco, Inc.                                     0.81%
Chris-Craft Industries, Inc.                       0.80%
Wallace Computer Services, Inc.                    0.80%
Noram Energy Corp.                                 0.80%
First American Corp. of Tennessee                  0.77%
Compass Bancshares Inc.                            0.76%
Jones Apparel Group Inc.                           0.75%
</TABLE>


                                                                               4
<PAGE>   27
GATEWAY MID CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
    Shares                      Common Stocks                              Value
    ------                      -------------                              -----    
<S>            <C>                                                          <C>       
               AEROSPACE & EQUIPMENT  0.97%
     200       OEA, Inc.                                                   $  7,513
     400       Rohr Inc. *                                                    8,350
     100       Sequa Corp. *                                                  4,300
     600       Sundstrand Corporation                                        21,975
     200       Teleflex Incorporated                                          9,563
     200       Thiokol Corporation                                            7,900
                                                                           --------
                                                                             59,601
                                                                           --------

               APPAREL  1.12%
     200       Ann Taylor Stores Corp. *                                      4,075
     500       Cintas Corp.                                                  26,563
     200       Jones Apparel Group Inc. *                                     9,838
     300       Nine West Group, Inc. *                                       15,300
     500       Warnaco Group, Inc.                                           12,813
                                                                           --------
                                                                             68,589
                                                                           --------

               AUTOMOBILES & PARTS  1.09%
     300       Arvin Industries, Inc.                                         6,675
     300       Federal-Mogul Corporation                                      5,550
     400       Federal Signal Corporation                                     9,450
     700       Harley Davidson, Inc.                                         28,831
     300       Modine Manufacturing Company                                   7,913
     300       Superior Industries International                              7,950
                                                                           --------
                                                                             66,369
                                                                           --------

               OTHER CONSUMER DURABLES  1.78%
     400       Albany International Corp. Class A                             9,025
     700       Burlington Industries, Inc. *                                  9,888
     200       Church & Dwight Company, Inc.                                  4,175
     400       GenCorp, Inc.                                                  6,075
     200       Herman Miller, Inc.                                            6,113
     100       HON Industries, Inc.                                           2,863
     800       Leggett & Platt, Inc.                                         22,200
     100       NCH Corporation                                                6,425
   1,300       Shaw Industries, Inc.                                         16,981

               OTHER CONSUMER DURABLES - Continued
     200       Stanhome Incorporated                                       $  5,313
     700       Unifi, Inc.                                                   19,731
                                                                           --------
                                                                            108,789
                                                                           --------

               BUILDING MATERIALS & CONSTRUCTION  0.28%
     300       Granite Construction, Inc.                                     6,975
     200       Jacobs Engineering Group Inc. *                                5,275
     200       Southdown Incorporated                                         4,700
                                                                           --------
                                                                             16,950
                                                                           --------

               BUSINESS SERVICES & SUPPLIES  3.61%
     100       Angelica Corporation                                           2,363
     450       Comdisco, Inc.                                                12,038
   1,400       Equifax Inc.                                                  36,575
     300       FlightSafety International, Inc.                              16,275
     300       Healthcare COMPARE Corp. *                                    14,606
     305       Information Resources, Inc. *                                  3,698
     400       Kelly Services, Inc.                                          11,850
     700       Manpower Inc.                                                 27,563
     500       Medaphis Corp. *                                              19,844
     600       Olsten Corp.                                                  17,625
     675       Paychex, Inc.                                                 32,442
     400       Pittston Brinks Group                                         11,650
     300       Rollins, Inc.                                                  7,013
     500       Sotheby's Holdings, Inc.                                       7,219
                                                                           --------
                                                                            220,761
                                                                           --------

               CHEMICALS  3.35%
     600       Albemarle Corp.                                               10,950
     300       Betz Laboratories, Inc.                                       13,163
     600       Cabot Corporation                                             14,775
     500       Crompton & Knowles                                             8,344
     300       Dexter Corp.                                                   8,963
   1,100       Ethyl Corp.                                                   10,656
     300       Ferro Corporation                                              7,950
</TABLE>

                 See accompanying notes to financial statements


                                                                               5
<PAGE>   28
GATEWAY MID CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
   Shares             Common Stocks                                          Value
   ------             -------------                                          -----

<S>                                                                       <C>      
               CHEMICALS - Continued
     100       Fuller (H. B.) Company                                      $  3,638
     400       Georgia Gulf Corp.                                            11,700
     800       IMC Global, Inc.                                              30,100
     400       Lawter International, Inc.                                     5,000
     300       Loctite Corporation                                           13,988
     600       Lubrizol Corporation                                          18,188
     200       Minerals Technologies, Inc.                                    6,875
     200       Olin Corporation                                              17,863
     400       Schulman (A.), Inc.                                            9,750
     500       Sterling Chemicals, Inc. *                                     5,781
     300       Wellman, Inc.                                                  7,013
                                                                           --------
                                                                            204,697
                                                                           --------

               ELECTRONICS & COMPUTERS  9.37%
     500       ADC Telecommunications, Inc. *                                22,375
     400       Altera Corporation *                                          15,175
     900       American Power Conversion Corp. *                              9,338
   1,125       Analog Devices, Inc. *                                        28,688
     400       Arrow Electronics, Inc. *                                     17,250
     321       AST Research Inc. *                                            2,187
     800       Atmel Corp. *                                                 24,150
     400       Avnet, Inc.                                                   16,900
     600       Cirrus Logic, Inc. *                                          10,463
     800       Cypress Semiconductor Corporation *                            9,500
     800       Dell Computer Corporation *                                   40,650
     300       Hubbell Inc.                                                  19,819
     700       Integrated Device Technology *                                 7,481
     700       Linear Technology Corporation                                 20,956
     400       Litton Industries, Inc. *                                     17,450
     200       MagneTek, Inc. *                                               1,925
     500       Maxim Integrated Products *                                   13,656
   1,050       Molex Incorporated                                            33,600
     200       Nellcor, Inc. *                                                9,725
     400       Octel Communications Corp. *                                   7,850
     400       Quantum Corporation *                                          5,800

               ELECTRONICS & COMPUTERS - Continued

   1,009       Seagate Technology, Inc. *                                  $ 45,405
     700       Sensormatic Electronics Corporation                           11,419
     400       Sequent Computer Systems, Inc. *                               5,375
     400       Solectron Corp. *                                             15,150
     700       StrataCom, Inc.                                               39,506
     200       Stratus Computer, Inc. *                                       5,800
     800       U. S. Robotics *                                              68,300
     300       Varian Associates, Inc.                                       15,563
     525       Vishay Intertechnology, Inc. *                                12,502
     600       Xilinx, Inc. *                                                19,013
                                                                           --------
                                                                            572,971
                                                                           --------

               COMPUTER SOFTWARE & PERIPHERALS  4.67%
     700       Adobe Systems, Inc.                                           24,981
     700       America Online Inc. *                                         30,538
     400       BMC Software, Inc. *                                          23,850
     300       Borland International, Inc. *                                  2,719
     800       Cadence Design Systems, Inc. *                                27,100
     400       Compuware Corp. *                                             15,750
     400       Electronic Arts Inc. *                                        10,650
     200       Exabyte Corporation *                                          2,613
     400       FIserv, Inc. *                                                12,100
   1,200       Informix Corporation *                                        26,925
     500       Mentor Graphics Corporation *                                  8,094
   1,200       Parametric Technology Corporation *                           51,975
     200       Policy Management Systems Corp. *                             10,000
     504       Storage Technology Corporation *                              19,278
     300       Structural Dynamics Research Corp. *                           6,563
     300       Symantec Corp. *                                               3,769
     200       Symbol Technologies, Inc. *                                    8,888
                                                                           --------
                                                                            285,793
                                                                           --------

               ENERGY  5.44%
     600       Anadarko Petroleum Corp.                                      34,875
     800       Apache Corporation                                            26,300
</TABLE>


                 See accompanying notes to financial statements


                                                                               6
<PAGE>   29
GATEWAY MID CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
   Shares           Common Stocks                                            Value
   ------           -------------                                            -----

               ENERGY - Continued
<S>            <C>                                                         <C>     
     300       BJ Services Company *                                       $ 10,575
     300       Diamond Shamrock, Inc.                                         8,644
     600       ENSCO International Incorporated *                            19,538
   1,600       Global Marine, Inc. *                                         22,200
     800       Lyondell Petrochemical Company                                19,400
     300       MAPCO                                                         16,913
     400       Murphy Oil Corporation                                        18,200
   1,100       Nabors Industries, Inc. *                                     17,875
     500       Noble Affiliates, Inc.                                        18,875
     500       Parker Drilling Company *                                      2,906
     300       Parker & Parsley Petroleum                                     8,288
     400       Quaker State Corporation                                       6,000
     400       Questar Corporation                                           13,600
   1,000       Ranger Oil Limited                                             7,313
     300       Seagull Energy Corporation *                                   7,500
     400       Smith International, Inc. *                                   12,050
     300       Tosco Corporation                                             15,075
     400       Valero Energy Corporation                                     10,000
     300       Varco International, Inc. *                                    5,438
     453       Weatherford International, Inc. *                             13,618
     500       Witco Corporation                                             17,219
                                                                           --------
                                                                            332,402
                                                                           --------

               FINANCE, INSURANCE & REAL ESTATE  12.58%
   1,200       AFLAC Incorporated                                            35,925
     500       American Financial Group, Inc.                                15,125
     400       Bancorp Hawaii, Inc.                                          14,400
   1,212       Bear Stearns Companies, Inc.                                  28,785
     600       Central Fidelity Banks, Inc.                                  13,500
     400       City National Corporation                                      6,325
     400       Crestar Financial Corporation                                 21,350
     300       Dauphin Deposit Corporation                                    8,569
     600       Edwards (A. G.), Inc.                                         16,313
     600       First of America Bank Corporation                             26,888
     750       First Security Corporation                                    18,094

               FINANCE, INSURANCE & REAL ESTATE - Continued
     600       First Tennessee National Corp.                              $ 18,338
     300       First Virginia Banks, Inc.                                    12,019
     700       Firstar Corp.                                                 32,331
     500       Foundation Health Corp. *                                     17,906
     700       Franklin Resources, Inc.                                      42,744
     200       Hartford Steam Boiler Inspection and Insurance Co.             9,825
     600       Healthsource, Inc. *                                          10,500
   1,100       Hibernia Corporation                                          11,963
     900       Marshall & Ilsley Corporation                                 25,031
     500       Mercantile Bancorporation, Inc.                               22,281
     500       Mercantile Bankshares Corporation                             12,781
     500       Northern Trust Corporation                                    28,938
     700       PaineWebber Group, Inc.                                       16,625
     200       PHH Corporation                                               11,400
     700       Progressive Corporation                                       32,375
     400       Provident Companies, Inc.                                     14,825
     600       Regions Financial Corp.                                       28,125
   1,600       Schwab (Charles) Corporation                                  39,200
     900       SouthTrust Corporation                                        25,425
     800       State Street Boston Corporation                               40,800
     800       Summit Bancorporation                                         28,150
     500       SunAmerica, Inc.                                              28,250
     600       T. Rowe Price Associates, Inc.                                18,525
     200       Transatlantic Holdings, Inc.                                  14,013
     499       Value Health, Inc. *                                          11,820
     300       Wilmington Trust Corporation                                   9,750
                                                                           --------
                                                                            769,214
                                                                           --------

               FOOD, BEVERAGE & TOBACCO  3.83%
   1,300       Coca-Cola Enterprises, Inc.                                   44,931
     400       Dean Foods Company                                             9,925
     600       Dole Food Company, Inc.                                       25,875
     200       Dreyer's Grand Ice Cream, Inc.                                 6,375
     750       Flowers Industries, Inc.                                      12,047
   1,000       IBP, Inc.                                                     27,563
</TABLE>


                 See accompanying notes to financial statements


                                                                               7
<PAGE>   30
GATEWAY MID CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
   Shares              Common Stocks                                        Value
   ------              -------------                                        -----
  <S>          <C>                                                        <C> 
               FOOD, BEVERAGE & TOBACCO - Continued
     200       International Multifoods Corp.                             $   3,675
     300       Lancaster Colony Corporation                                  11,213
     300       Lance, Inc.                                                    4,988
     800       McCormick & Company, Inc.                                     17,600
     400       Michael Foods, Inc.                                            4,625
     500       Savannah Foods & Industries, Inc.                              6,438
     400       Smucker (J. M.) Company                                        7,850
   1,300       Tyson Foods, Inc.                                             35,506
     300       Universal Corporation Holding Co.                              7,931
     200       Universal Foods Corporation                                    7,363
                                                                           --------
                                                                            233,905
                                                                           --------

               HEALTH  7.52%
     400       Acuson Corporation *                                           6,400
     200       Advanced Technology Laboratories, Inc. *                       7,325
     300       APL Ltd.                                                       7,838
     600       Applied Bioscience International, Inc. *                       6,263
     400       Apria Healthcare Group Inc. *                                 12,550
     400       Bergen Brunswig Corporation                                   11,125
     300       Biogen, Inc. *                                                16,406
     600       Cardinal Health, Inc.                                         43,425
     400       Carter-Wallace, Inc.                                           5,850
     500       Centocor, Inc. *                                              14,969
     409       Chiron Corporation *                                          40,031
     400       Coram Healthcare Corp. *                                       1,650
     300       Datascope Corporation *                                        5,363
     300       Dentsply International, Inc.                                  12,694
     100       Diagnostic Products Corporation                                3,850
     400       FHP International Corp. *                                     11,000
     400       Forest Laboratories, Inc. *                                   15,500
     200       Genzyme Corporation *                                         10,075
     450       Health Care & Retirement *                                    10,688
   1,469       HEALTHSOUTH Rehabilitation Corp. *                            52,792
     415       Horizon CMS Healthcare Corp. *                                 5,343
   1,100       IVAX Corporation                                              17,394

               HEALTH - Continued
     576       Laboratory Corp. of America *                               $  4,284
     400       McKesson Corp.                                                19,125
   1,200       Mylan Laboratories, Inc.                                      20,700
     600       NovaCare, Inc. *                                               4,613
     300       PacifiCare Health Systems, Inc. *                             20,363
     700       Perrigo Company *                                              7,919
     200       Scherer (R. P.) Corp. *                                        9,075
   1,000       Stryker Corporation                                           22,688
     700       Vencor Inc. *                                                 21,350
     300       Watson Pharmaceuticals *                                      11,363
                                                                           --------
                                                                            460,011
                                                                           --------

               MACHINERY & RELATED PRODUCTS  0.67%
     200       Duriron Company, Inc.                                          4,788
     200       Goulds Pumps Incorporated                                      5,138
     300       Kennametal Inc.                                               10,181
     100       Lawson Products, Inc.                                          2,519
     200       Nordson Corporation                                           11,375
     300       Stewart & Stevenson Services, Inc.                             6,750
                                                                           --------
                                                                             40,751
                                                                           --------

               MINING & METALS  1.02%
     800       Battle Mountain Gold Company                                   5,850
     300       CalMat Company                                                 5,419
     100       Cleveland-Cliffs, Inc.                                         3,919
     300       Donaldson Company, Inc.                                        7,669
     300       Keystone International, Inc.                                   6,244
     625       RPM, Inc.                                                      9,805
     300       Vulcan Materials Co.                                          17,813
     300       Watts Industries, Inc.                                         5,588
                                                                           --------
                                                                             62,307
                                                                           --------
               PAPER & FOREST PRODUCTS  2.01%
     400       Bowater, Inc.                                                 15,050
     200       Chesapeake Corporation                                         5,238
     400       Consolidated Papers, Inc.                                     20,800
</TABLE>


                 See accompanying notes to financial statements


                                                                               8
<PAGE>   31
GATEWAY MID CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
    Shares                      Common Stocks                              Value
    ------                      -------------                              ----- 
   <S>         <C>                                                         <C>
               PAPER & FOREST PRODUCTS - Continued
     400       Glatfelter (P. H.) Co.                                      $  7,350
     500       Longview Fibre Company                                         8,469
     400       Pentair, Inc.                                                 12,025
     300       Rayonier Inc.                                                 11,344
     840       Sonoco Products Company                                       23,835
     400       Tambrands Inc.                                                16,375
     120       Wausau Paper Mills Company                                     2,400
                                                                           --------
                                                                            122,886
                                                                           --------

               PRECISION INSTRUMENTS  1.46%
     300       Ametek, Inc.                                                   6,525
     300       Beckman Instruments, Inc.                                     11,363
     200       Measurex Corporation                                           5,850
     600       Teradyne, Inc. *                                              10,388
   1,325       Thermo Electron Corporation *                                 55,153
                                                                           --------
                                                                             89,279
                                                                           --------

               RETAIL  4.57%
     600       Bed Bath and Beyond *                                         15,938
     400       Best Buy Company, Inc. *                                       9,125
     300       Claire's Stores, Inc.                                          8,288
     700       CML Group, Inc.                                                2,931
     750       Dollar General Corporation                                    21,891
     300       Duty Free International, Inc.                                  4,556
     500       Family Dollar Stores, Inc.                                     8,688
     400       Fingerhut Companies, Inc.                                      6,250
     200       Fred Meyer Inc. *                                              5,875
     400       Hancock Fabrics, Inc.                                          4,375
     400       Hannaford Brothers Company                                    13,050
     500       Heilig-Meyers Company                                         12,000
     900       Home Shopping Network, Inc. *                                 10,856
     500       Intelligent Electronics, Inc.                                  4,219
     800       Kohl's Corp. *                                                29,250
     300       Lands' End, Inc. *                                             7,388
     400       MacFrugal's Bargains-Closeouts, Inc. *                         7,150

               RETAIL - Continued
     300       Microwarehouse Inc. *                                       $  5,925
     400       Payless ShoeSource, Inc. *                                    12,675
     600       Revco (D. S.) Inc. *                                          14,288
     600       Ruddick Corporation                                            7,388
   1,000       Service Merchandise Company Inc. *                             5,688
     200       Tiffany & Co.                                                 14,600
     800       Viking Office Products *                                      25,050
     400       Vons Companies, Inc. *                                        14,950
     300       Waban Inc. *                                                   7,163
                                                                           --------
                                                                            279,557
                                                                           --------

               SERVICES  6.32%
     200       Airborne Freight Corporation                                   5,200
     100       Alaska Air Group, Inc. *                                       2,738
     300       Arnold Industries, Inc.                                        4,238
     300       Atlantic Southeast Airlines, Inc.                              8,494
     300       Banta Corp.                                                    7,594
     400       Belo (A. H.) Corporation Class A                              14,900
     400       Bob Evans Farms, Inc.                                          6,775
     700       Brinker International, Inc. *                                 10,544
     300       Buffets, Inc. *                                                3,638
     600       Calgon Carbon Corp.                                            8,100
     309       Chris-Craft Industries, Inc. *                                13,596
     100       CPI Corporation                                                1,650
     600       Cracker Barrel Old Country Store, Inc. *                      14,475
     300       Ennis Business Forms, Inc.                                     3,356
     300       Gibson Greetings, Inc. *                                       4,144
     400       Golden Books Family Entertainment, Inc. *                      4,850
     100       Houghton Mifflin Company                                       4,975
     500       Hunt (J. B.) Transport Services, Inc.                         10,469
     600       Illinois Central Corp.                                        17,025
     200       International Dairy Queen, Inc. *                              4,325
     400       Kansas City Southern Industries, Inc.                         17,175
     400       Lee Enterprises, Incorporated                                  9,500
     300       Lone Star Steakhouse *                                        11,306
</TABLE>


                 See accompanying notes to financial statements


                                                                               9
<PAGE>   32
GATEWAY MID CAP INDEX FUND
Portfolio of Investments -June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
   Shares                    Common Stocks                                  Value
   ------                    -------------                                  -----  
<S>            <C>                                                         <C>     
               SERVICES - Continued
     300       Media General, Inc.                                         $ 11,138
     800       Omnicom Group Inc.                                            37,050
     400       Outback Steakhouse, Inc. *                                    13,750
     400       Promus Hotel Corporation *                                    11,850
     400       Reynolds and Reynolds Company                                 21,300
     200       Sbarro Incorporated                                            5,013
     100       Scholastic Corp. *                                             6,225
     200       TCA Cable TV Incorporated                                      6,000
     600       Topps Company, Inc. *                                          3,338
     400       Trinity Industries, Inc.                                      13,575
     800       USA Waste Services, Inc. *                                    23,750
     200       Wallace Computer Services, Inc.                               11,938
     100       Washington Post Company                                       32,400
                                                                           --------
                                                                            386,394
                                                                           --------

               STEEL & IRON  0.55%
     700       Allegheny Ludlum Corporation                                  13,213
     200       Carpenter Technology Corporation                               6,400
     100       Lukens Inc.                                                    2,381
     200       Oregon Steel Mills, Inc.                                       2,750
     200       Precision Castparts Corporation                                8,600
                                                                           --------
                                                                             33,344
                                                                           --------

               OTHER INDUSTRIAL CYCLICALS  5.15%
     400       Alexander & Baldwin Company                                    9,700
     400       Alumax, Inc. *                                                12,150
     300       Brush Wellman Inc.                                             5,681
     100       Carlisle Companies Inc.                                        5,313
     875       Clayton Homes, Inc.                                           17,500
     200       Cross (A. T.) Company                                          3,538
     600       Danaher Corp.                                                 26,100
     450       Diebold Incorporated                                          21,713
     400       Fastenal Company                                              17,450
     400       First Brands Corporation                                      10,800
     450       Hanna (M. A.) Company                                          9,366

               OTHER INDUSTRIAL CYCLICALS - Continued
     200       Kaydon Corporation                                          $  8,600
     661       Mark IV Industries, Inc.                                      14,955
     100       MAXXAM Inc. *                                                  3,925
   1,300       Office Depot, Inc. *                                          26,569
     300       Overseas Shipholding Group, Inc.                               5,438
     400       Sealed Air Corporation *                                      13,450
     400       Standard Register Company                                      9,875
   1,350       Staples, Inc. *                                               26,241
     200       Tecumseh Products Company                                     10,800
     600       Tidewater Inc.                                                26,250
     200       Verifone, Inc. *                                               8,488
     400       York International Corporation                                20,700
                                                                           --------
                                                                            314,602
                                                                           --------
               UTILITIES  14.90%
   1,100       360 Communications Company *                                  26,400
     700       AES Corporation *                                             19,688
     700       AGL Resources Inc.                                            13,213
   1,100       Allegheny Power System, Inc.                                  33,963
     300       American Water Works Co., Inc.                                12,038
     500       Atlantic Energy Inc.                                           9,125
     100       Black Hills Corporation                                        2,488
     500       Brooklyn Union Gas Company                                    13,594
     500       California Energy Company *                                   12,750
     200       Central Louisiana Electric Company, Inc.                       5,350
     400       Central Maine Power Company                                    5,825
     500       Century Telephone Enterprises, Inc.                           16,000
     800       CMS Energy Corporation                                        24,750
     500       COMSAT                                                        13,031
     600       Delmarva Power & Light Company                                12,600
     400       El Paso Natural Gas Company                                   15,375
     900       Florida Progress Corporation                                  31,275
   1,400       Frontier Corp.                                                42,788
     300       Hawaiian Electric Industries, Inc.                            10,594
     400       Idaho Power Company                                           12,450
     700       Illinova Corp.                                                20,125
</TABLE>



                  See accompanying notes to financial statement


                                                                              10
<PAGE>   33
GATEWAY MID CAP INDEX FUND
Portfolio of Investments -June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
    Shares                 Common Stocks                                    Value
    ------                 -------------                                    -----
<S>            <C>                                                       <C>       
               UTILITIES - Continued
     300       Indiana Energy, Inc.                                      $    8,663
     600       IPALCO Enterprises, Inc.                                      15,788
     400       Kansas City Power & Light Company                             11,000
     600       LG&E Energy Corp.                                             13,688
     400       Lincoln Telecommunications Company                             6,525
     600       MCN Corporation                                               14,625
     888       Mid American Energy Company                                   15,374
     300       Minnesota Power & Light Company                                8,644
     500       Montana Power Company                                         11,156
     300       National Fuel Gas Company                                     10,800
     400       Nevada Power Company                                           8,775
     600       New England Electric System                                   21,750
     700       New York State Electric & Gas Corp.                           17,063
   2,000       NEXTEL Communications, Inc. *                                 38,125
     600       NIPSCO Industries, Inc.                                       24,075
   1,200       Northeast Utilities                                           16,050
     400       Oklahoma Gas & Electric Company                               15,900
     800       Pinnacle West Capital Corporation                             24,300
     500       Portland General Corp. Holding Co.                            15,406
   1,100       Potomac Electric Power Company                                29,081
     600       Public Service Company of Colorado                            22,050
     400       Public Service Company of New Mexico                           8,175
     700       Puget Sound Power & Light Co.                                 16,975
   1,000       SCANA Corporation                                             28,188
     600       Southern New England Telecommunications Corp.                 25,238
     400       Southwestern Public Service Company                           13,050
   1,100       TECO Energy, Inc.                                             27,706
     500       Telephone & Data Systems, Inc.                                22,531
     400       UtiliCorp United Inc.                                         11,025
     400       Vanguard Cellular Systems, Inc. *                              8,775
     400       Washington Gas Light Company                                   8,800
   1,000       Wisconsin Energy Corporation                                  28,875
     300       WPL Holdings, Inc.                                             9,863
                                                                         ----------
                                                                            911,461
                                                                         ----------


               MISCELLANEOUS  3.90%
     700       Callaway Golf Co.                                         $   23,319
   1,000       Circus Circus Enterprises, Inc. *                             40,938
     200       GATX Corporation                                               9,650
     200       Harsco Corp.                                                  13,438
   1,100       Hospitality Franchise Systems *                               77,000
   1,300       International Game Technology                                 22,019
     900       Mirage Resorts Incorporated *                                 48,380
     100       National Presto Industries, Inc.                               3,819
                                                                         ----------
                                                                            238,563
                                                                         ----------

               TOTAL COMMON STOCKS  96.16%                                5,879,196
               (cost $4,879,752)

 Contracts
               PUT OPTIONS ON THE STANDARD & POOR'S 500
                  STOCK INDEX  0.20%
      50       expiring August 16, 1996 at 630                               12,188
               (cost $25,175)


               REPURCHASE AGREEMENT 3.35%
               5% repurchase agreement dated June 28, 1996
               with Star Bank, N.A., due July 1, 1996
               (repurchase proceeds $205,085),
               collateralized by $220,000
               6% GNMA Pool #8974, maturity May 20, 2022
               (market value $222,750)                                      205,000
                                                                         ----------

               TOTAL INVESTMENTS AND REPURCHASE AGREEMENT  99.71%         6,096,384

               OTHER ASSETS AND LIABILITIES, NET 0.29%                       17,868
                                                                         ----------

               NET ASSETS  100%                                          $6,114,252
                                                                         ==========
</TABLE>

               *   Denotes a non-income producing security.


                  See accompanying notes to financial statement


                                                                              11
<PAGE>   34
GATEWAY MID CAP INDEX FUND                                     
Statement of Assets and Liabilities - June 30, 1996 (unaudited)

<TABLE>
<S>                                                                    <C>       
ASSETS:
Common stocks, at value (original cost $4,879,752)                     $5,879,196
Put options, at value (original cost $25,175)                              12,188
Repurchase agreement                                                      205,000
Dividend and interest receivable                                            6,340
Receivable for fund shares sold                                                87
Cash                                                                          274
Other assets                                                               20,834
                                                                       ----------
                                                                        6,123,919
                                                                       ----------

LIABILITIES:
Payable for fund shares redeemed                                            5,703
Other accrued expenses and liabilities                                      3,964
                                                                       ----------
                                                                            9,667
                                                                       ----------
NET ASSETS                                                             $6,114,252
                                                                       ----------

NET ASSETS CONSIST OF:
Paid-in capital applicable to 490,418 shares outstanding
   (unlimited number of shares authorized, no par value)               $4,997,614
Overdistributed net investment income                                      (4,999)
Accumulated realized gain, net                                            135,180
Unrealized appreciation, net                                              986,457
                                                                       ----------
                                                                       $6,114,252
                                                                       ----------

NET ASSET VALUE, OFFERING, AND REDEMPTION PRICE PER
   SHARE                                                                   $12.47
                                                                       ----------
</TABLE>


GATEWAY MID CAP INDEX FUND                                                      
Statement of Operations - For the Six Months Ended June 30, 1996 (unaudited)

<TABLE>
<S>                                                                    <C>       
INVESTMENT INCOME:
Dividend income                                                        $   47,377
Interest income                                                             5,217
                                                                       ----------
                                                                           52,594
                                                                       ----------

EXPENSES:
Transfer agent and accounting fees                                         38,783
Investment advisory and management fees                                    26,715
Registration fees                                                           7,632
Professional fees                                                           6,631
Custodian fees                                                              6,449
Trustees' fees                                                              3,393
Reports to shareholders                                                     2,249
Other expenses                                                              5,179
                                                                       ----------
                                                                           97,031
Fees waived and expenses reimbursed under contract                        (37,454)
Expenses reimbursed voluntarily                                              (305)
                                                                       ---------- 
                                                                           59,272
                                                                       ----------
NET INVESTMENT LOSS                                                        (6,678)
                                                                       ---------- 

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Realized gain (loss) on investments:
   Securities                                                             158,487
   Put options expired and closed                                         (38,493)
                                                                       ---------- 
     Net realized gain on investments                                     119,994
                                                                       ----------
Change in unrealized appreciation
(depreciation) of investments:
   Securities                                                             299,435
   Put options                                                                903
                                                                       ----------
     Change in unrealized appreciation (depreciation)
      of investments                                                      300,338
                                                                       ----------

NET REALIZED AND UNREALIZED GAIN
   ON INVESTMENTS                                                         420,332
                                                                       ----------

NET INCREASE IN NET ASSETS RESULTING
   FROM OPERATIONS                                                     $  413,654
                                                                       ----------
</TABLE>


                 See accompanying notes to financial statements


                                                                              12
<PAGE>   35
GATEWAY MID CAP INDEX FUND
Statement of Changes in Net Assets (unaudited)


<TABLE>
<CAPTION>
                                                  Six Months            Year
                                                     Ended              Ended
                                                  June 30, 1996   December 31, 1995
                                                  -------------   -----------------
<S>                                               <C>                <C>       
FROM OPERATIONS:
Net investment income (loss)                      $   (6,678)        $    2,708
Net realized gain on investments                     119,994            201,764
Change in unrealized appreciation
   (depreciation) of investments                     300,338          1,077,912
                                                  ----------         ----------
Net increase in net assets resulting from
   operations                                        413,654          1,282,384
                                                  ----------         ----------

DIVIDENDS AND DISTRIBUTIONS
   TO SHAREHOLDERS:
From net investment income                                --            (28,380)
From net realized gain on investments                     --           (175,010)
                                                  ----------         ----------
Decrease in net assets from dividends
   and distributions                                      --           (203,390)
                                                  ----------         ----------

FROM FUND SHARE TRANSACTIONS:
Proceeds from shares sold                            670,295            770,226
Net asset value of shares issued in
   reinvestment of dividends and distributions            --            202,760
   
Payments for shares redeemed                        (663,126)        (2,947,026)
                                                  ----------         ----------
Net increase (decrease) in net assets from
   fund share transactions                             7,169         (1,974,040)
                                                  ----------         ----------

NET INCREASE (DECREASE) IN NET ASSETS                420,823           (895,046)

NET ASSETS:
Beginning of period                                5,693,429          6,588,475
                                                  ----------         ----------
End of period                                     $6,114,252         $5,693,429
                                                  ==========         ==========

FUND SHARE TRANSACTIONS:
Shares sold                                           54,539             68,899
Shares issued in reinvestment of dividends
   and distributions                                      --             17,473
Less shares redeemed                                 (54,356)          (283,661)
                                                  ----------         ----------

NET INCREASE (DECREASE) IN
   SHARES OUTSTANDING                                    183           (197,289)
                                                  ==========         ==========
</TABLE>



GATEWAY MID CAP INDEX FUND
Financial Highlights (unaudited)


<TABLE>
<CAPTION>
                                       Six Months                        Year Ended                     Period Ended
                                         Ended                           December 31,                    December 31,
                                     June 30, 1996          1995 (5)        1994           1993            1992 (1)
                                     -------------          -----------------------------------         -------------

<S>                                       <C>               <C>            <C>             <C>            <C>
Net asset value, beginning of
   period                                 $11.61            $ 9.58         $10.16          $10.04         $10.00
                                          ------            ------         ------          ------         ------
Net investment income (loss)               (0.01)             0.03           0.08            0.11           0.03
Net gains (losses) on securities            0.87              2.43          (0.60)           0.41           0.04
                                          ------            ------         ------          ------         ------
  Total from investment operations          0.86              2.46          (0.52)           0.52           0.07
                                          ------            ------         ------          ------         ------
Dividends from net
  investment income                         0.00             (0.06)         (0.05)          (0.11)         (0.03)
Distributions from capital gains            0.00             (0.37)         (0.01)          (0.29)          0.00
                                          ------            ------         ------          ------         ------
  Total distributions                       0.00             (0.43)         (0.06)          (0.40)         (0.03)
                                          ------            ------         ------          ------         ------
Net asset value, end of period            $12.47            $11.61         $ 9.58          $10.16         $10.04
                                          ======            ======         ======          ======         ======
TOTAL RETURN                                7.41%(3)         25.68%         (5.12%)          5.18%          0.70%(3)
Net assets, end of period                 $ 6.11            $ 5.69         $ 6.59          $10.46         $10.69
  (millions)
Ratio of net expenses to
  average net assets (2)                    1.99%             1.98%          1.50%           1.50%          1.50%
Ratio of net investment income
  (loss) to average net assets(2)          (0.22%)            0.05%          0.59%           1.06%          1.39%
Portfolio turnover rate                        9%(2)            18%             8%            105%             0%(3)
Average commission per share (4)          $ 0.04               n/a            n/a             n/a             n/a
</TABLE>



(1)  The Mid Cap Index Fund commenced operations on September 30, 1992.

(2)  The ratios of net expenses to average net assets would have increased and
     net investment income to average net assets would have decreased by 0.01%
     in 1996 and 0.02% in 1995 had the Adviser not voluntarily reimbursed
     expenses. These ratios have been annualized for periods less than a year.

(3)  Not annualized.

(4)  Pursuant to new reporting requirements, average commission per share is
     presented for 1996.

(5)  On December 15, 1995, Gateway Investment Advisers, L.P. became investment
     adviser of the Fund.


                 See accompanying notes to financial statements


                                                                              13
<PAGE>   36
GATEWAY SMALL CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
 Shares                              Common Stock                           Value
 ------                              ------------                           -----

<S>             <C>                                                        <C>     
                AEROSPACE & EQUIPMENT  0.99%
  1,200         Kaman Corporation                                          $ 12,075
  1,000         Teleflex Incorporated                                        47,813
  1,100         Thiokol Corporation                                          43,450
                                                                           --------
                                                                            103,338
                                                                           --------

                APPAREL  1.70%
  1,200         Brown Group, Inc.                                            20,775
  1,600         Jones Apparel Group Inc. *                                   78,700
  1,500         Kellwood Company                                             27,469
  2,100         Westpoint Stevens, Inc. *                                    50,400
                                                                           --------
                                                                            177,344
                                                                           --------

                AUTOMOBILES & PARTS  1.72%
  1,400         Arvin Industries, Inc.                                       31,150
  1,100         Clarcor Inc.                                                 27,294
  2,300         Federal-Mogul Corporation                                    42,550
  1,200         Standard Products Co.                                        27,825
  1,900         Superior Industries International                            50,350
                                                                           --------
                                                                            179,169
                                                                           --------

                OTHER CONSUMER DURABLES  3.12%
  2,800         Acclaim Entertainment *                                      27,125
  1,900         Albany International Corp. Class A                           42,869
  1,000         Bassett Furniture Industries, Inc.                           26,625
  2,000         Cone Mills Corporation *                                     22,625
  2,300         GenCorp, Inc.                                                34,931
  1,600         HON Industries, Inc.                                         45,800
  1,200         La-Z-Boy Chair Company                                       36,225
    500         NCH Corporation                                              32,125
  1,500         Russ Berrie and Company, Inc.                                27,563
  1,100         Stanhome Incorporated                                        29,219
                                                                           --------
                                                                            325,107
                                                                           --------

                BUILDING MATERIALS & CONSTRUCTION  2.03%
  1,800         Centex Corporation                                           56,475
  2,300         Kaufman and Broad Home Corp.                                 33,350
  2,100         Lennar Corporation                                           52,500

                BUILDING MATERIALS & CONSTRUCTION - Continued
  1,700         Pulte Corporation                                          $ 45,475
  1,000         Southdown Incorporated                                       23,500
                                                                           --------
                                                                            211,300
                                                                           --------

                BUSINESS SERVICES & SUPPLIES  3.47%
  1,500         AMRESCO Inc.                                                 25,781
  3,150         Comdisco, Inc.                                               84,263
  1,900         Coventry Corp. *                                             29,806
  1,927         Information Resources, Inc. *                                23,365
  2,600         Pittston Brinks Group                                        75,725
  1,100         Profit Recovery Group International *                        21,863
  2,300         Rollins, Inc.                                                53,763
  3,300         Sotheby's Holdings, Inc.                                     47,644
                                                                           --------
                                                                            362,210
                                                                           --------

                CHEMICALS  1.49%
    600         Chemed Corporation                                           22,275
    800         Fuller (H. B.) Company                                       29,100
  2,800         Lawter International, Inc.                                   35,000
    800         Petrolite Corporation                                        25,400
  3,800         Sterling Chemicals, Inc. *                                   43,938
                                                                           --------
                                                                            155,713
                                                                           --------

                ELECTRONICS & COMPUTERS  5.97%
  1,848         AST Research Inc. *                                          12,590
  2,700         Aura Systems Inc. *                                           9,534
  1,650         Baldor Electric Company                                      36,300
  1,100         Cyrix Corporation *                                          19,044
  1,300         DSP Communications Inc. *                                    66,706
  2,000         ESS Technology Inc. *                                        36,750
  3,600         Geotek Communications, Inc. *                                49,275
  1,500         IMP Inc. *                                                   16,781
  2,400         Kemet Corp. *                                                48,300
  1,200         Lattice Semiconductor *                                      28,950
  2,300         Oak Technology Inc. *                                        21,706
  3,000         Octel Communications Corp. *                                 58,875
  3,300         Quantum Corporation *                                        47,850
  1,800         SCI Systems Inc. *                                           73,238
</TABLE>


                 See accompanying notes to financial statements


                                                                              14
<PAGE>   37
GATEWAY SMALL CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
 Shares                              Common Stock                             Value
 ------                              ------------                             -----
<S>             <C>                                                        <C>     
                ELECTRONICS & COMPUTERS - Continued
  2,200         Sequent Computer Systems, Inc. *                           $ 29,563
  1,800         Tencor Instruments                                           33,750
  2,400         VLSI Technology, Inc. *                                      33,450
                                                                           --------
                                                                            622,662
                                                                           --------

                COMPUTER SOFTWARE & PERIPHERALS  7.01%
  1,900         Cerner Corp. *                                               40,850
  2,200         Cheyenne Software Inc. *                                     42,350
  3,600         Computervision Corp. *                                       35,775
  1,500         Exabyte Corporation *                                        19,594
  1,400         FTP Software Inc. *                                          11,375
    900         Global Village Communications *                               7,481
  2,000         Macromedia Inc. *                                            44,000
    700         Medic Computer System Inc. *                                 56,831
  2,500         NetManage Inc. *                                             27,656
  2,800         Network General Corp. *                                      59,850
  2,200         PSINet Inc. *                                                25,163
  1,800         Quarterdeck Corp. *                                          16,988
  2,600         S3, Incorporated *                                           32,175
  1,400         Shared Medical Systems Corporation                           90,300
  2,000         Structural Dynamics Research Corp. *                         43,750
  3,100         Symantec Corp. *                                             38,944
  1,400         Symbol Technologies, Inc. *                                  62,213
  2,900         Western Digital Corp. *                                      75,763
                                                                           --------
                                                                            731,058
                                                                           --------

                ENERGY  6.14%
  1,700         BJ Services Company *                                        59,925
  5,400         Nabors Industries, Inc. *                                    87,750
  7,700         Noram Energy Corp.                                           83,256
  1,600         Oneok, Inc.                                                  40,100
  1,900         Pogo Producing Company                                       72,438
  2,200         Quaker State Corporation                                     33,000
  5,300         Rowan Companies, Inc. *                                      78,506
  2,400         Seagull Energy Corporation *                                 60,000
  2,500         Smith International, Inc. *                                  75,313
  1,500         Southwest Gas Corporation                                    24,094
  1,800         Southwestern Energy Company                                  25,538
                                                                           --------
                                                                            639,920
                                                                           --------
                FINANCE, INSURANCE & REAL ESTATE  18.05%
  3,200         20th Century Industries *                                  $ 53,200
    900         Alex. Brown & Sons Incorporated                              50,850
  1,200         American Bankers Insurance Group, Inc.                       52,500
  1,600         Americredit Corp. *                                          24,800
  1,400         Astoria Financial Corp.                                      38,063
  3,100         California Federal Bank, F.S.B. *                            56,963
  4,300         Catellus Development Corporation *                           39,506
  2,800         City National Corporation                                    44,275
  1,200         Collective Bancorp, Inc.                                     28,575
  2,400         Compass Bancshares Inc.                                      78,900
  2,600         Credit Acceptance Corp. *                                    55,250
  1,800         Dauphin Deposit Corporation                                  51,413
  1,900         First American Corp. of Tennessee                            80,156
  2,400         First Commerce Corp. of Louisiana                            85,200
    600         Foremost Corporation of America                              34,125
  2,300         Glendale Federal Bank *                                      41,975
    900         Great Financial Corp.                                        23,344
  1,500         Home Financial Corp.                                         19,594
  1,100         Integon Corporation                                          22,000
  1,600         John Alden Financial Corp.                                   35,400
  1,200         Liberty Corporation                                          38,325
  1,800         Life Partners Group, Inc.                                    40,950
  1,100         Life Re Corporation                                          33,894
  1,700         Long Island Bancorp                                          51,956
  1,700         Magna Group Inc.                                             40,588
  2,800         Mid Atlantic Medical Services *                              40,075
  1,100         NAC Re Corp.                                                 36,850
  1,700         Olympic Financial Ltd. *                                     38,994
    900         Onbancorp, Inc.                                              29,419
  2,300         Peoples Bank Bridgeport                                      51,319
  1,000         PHH Corporation                                              57,000
  7,300         Reliance Group Holdings Inc.                                 54,750
  1,900         Riggs National Corp.                                         23,156
  2,600         Rollins Truck Leasing Corp.                                  27,300
  2,600         Roosevelt Financial Group                                    50,213
    400         Seafield Capital Corp.                                       15,050
  2,700         Sovereign Bancorp Inc.                                       27,169
  2,000         Standard Federal Bank                                        77,250
  1,800         United Companies Financial Corp.                             61,425
</TABLE>

                 See accompanying notes to financial statements


                                                                              15
<PAGE>   38
GATEWAY SMALL CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
 Shares                              Common Stock                             Value
 ------                              ------------                             -----

<S>             <C>                                                      <C>       
                FINANCE, INSURANCE & REAL ESTATE - Continued
  2,094         Valley National Bancorp                                  $   53,397
    800         Washington National Corporation                              20,650
  3,600         Western National Corp.                                       66,375
  1,100         Zenith National Insurance Corp.                              30,113
                                                                         ----------
                                                                          1,882,307
                                                                         ----------

                FOOD, BEVERAGE & TOBACCO  2.68%
  3,400         Chiquita Brands International, Inc.                          44,413
    900         Dreyer's Grand Ice Cream, Inc.                               28,688
  3,400         Flowers Industries, Inc.                                     54,613
  1,200         International Multifoods Corp.                               22,050
  2,300         Interstate Bakeries Corporation                              61,956
  2,100         Ralcorp Holdings Inc.*                                       43,181
  1,900         Savannah Foods & Industries, Inc.                            24,463
                                                                         ----------
                                                                            279,364
                                                                         ----------

                HEALTH  7.36%
  1,600         Acuson Corporation *                                         25,600
    900         Advanced Technology Laboratories, Inc. *                     32,963
  2,400         Advanced Tissue Sciences Inc. *                              39,000
  1,600         Alliance Pharmaceutical Corp. *                              26,300
  1,600         Ballard Medical Products                                     30,700
  2,200         Bergen Brunswig Corporation                                  61,188
  1,233         Block Drug Company Inc.                                      51,170
  1,400         Cephalon Inc. *                                              27,475
  1,700         Dentsply International, Inc.                                 71,931
    900         Diagnostic Products Corporation                              34,650
  1,700         Gilead Sciences, Inc. *                                      42,713
  1,800         Haemonetics Corporation *                                    33,075
  1,800         Herbalife International Inc.                                 26,325
  1,700         ICN Pharmaceuticals Inc.                                     39,525
  1,200         Integrated Health Services                                   28,650
  1,600         Lincare Holdings, Inc. *                                     62,600
  1,700         Liposome Company Inc. *                                      31,875
  4,800         Perrigo Company *                                            54,300
  1,650         Summit Technology, Inc. *                                    23,409
  1,400         Ventritex Inc. *                                             24,063
                                                                         ----------
                                                                            767,512
                                                                         ----------
                MACHINERY & RELATED PRODUCTS  3.24%
  1,700         BW/IP, Inc.                                              $   32,513
  2,500         Cincinnati Milacron, Inc.                                    60,000
  1,500         Gerber Scientific, Inc.                                      24,094
  2,300         Giddings & Lewis, Inc.                                       37,663
  1,300         Goulds Pumps Incorporated                                    33,394
  1,600         Kennametal Inc.                                              54,300
    700         Lawson Products, Inc.                                        17,631
    500         Nacco Industries, Inc.                                       27,719
  1,800         Silicon Valley Group, Inc. *                                 33,863
    800         Zurn Industries, Inc.                                        16,700
                                                                         ----------
                                                                            337,877
                                                                         ----------

                MINING & METALS  1.09%
  1,300         Coeur D' Alene Mines Corp.                                   24,050
  1,600         Donaldson Company, Inc.                                      40,900
  3,400         Hecla Mining Company *                                       24,013
  2,000         Pegasus Gold Inc. *                                          24,375
                                                                         ----------
                                                                            113,338
                                                                         ----------

                PAPER & FOREST PRODUCTS  1.70%
  1,400         Chesapeake Corporation                                       36,663
  3,400         Gaylord Container Corp. *                                    26,669
  2,200         Pentair, Inc.                                                66,138
  2,363         Wausau Paper Mills Company                                   47,260
                                                                         ----------
                                                                            176,730
                                                                         ----------

                PRECISION INSTRUMENTS  1.48%
  2,000         Ametek, Inc.                                                 43,500
  1,800         Beckman Instruments, Inc.                                    68,175
  1,200         Credence Systems Corp. *                                     16,125
    900         Measurex Corporation                                         26,325
                                                                         ----------
                                                                            154,125
                                                                         ----------

                RETAIL  3.97%
    600         Blair Corporation                                            14,250
  2,000         Cato Corporation                                             11,875
  6,600         Charming Shoppes, Inc. *                                     46,200
  1,600         Dress Barn, Inc. *                                           17,000
  1,900         Duty Free International, Inc.                                28,856
  1,600         Eagle Hardware & Garden, Inc. *                              24,300
</TABLE>


                 See accompanying notes to financial statements


                                                                              16
<PAGE>   39
GATEWAY SMALL CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)


<TABLE>
<CAPTION>
 Shares                              Common Stock                             Value
 ------                              ------------                             -----
<S>             <C>                                                        <C> 
                RETAIL - Continued
  1,800         Fred Meyer Inc. *                                          $ 52,875
  5,900         Home Shopping Network, Inc. *                                71,169
  1,700         Intelligent Electronics, Inc.                                14,344
  2,100         Lands' End, Inc. *                                           51,713
  1,800         MacFrugal's Bargains-Closeouts, Inc. *                       32,175
  1,400         Ross Stores, Inc.                                            48,738
                                                                           --------
                                                                            413,495
                                                                           --------

                SERVICES  8.64%
  1,200         Airborne Freight Corporation                                 31,200
    900         Alaska Air Group, Inc. *                                     24,638
  1,800         Arnold Industries, Inc.                                      25,425
  1,800         Banta Corp.                                                  45,563
  2,500         Calgon Carbon Corp.                                          33,750
  1,906         Chris-Craft Industries, Inc. *                               83,864
  1,100         Gibson Greetings, Inc. *                                     15,194
  1,500         Golden Books Family Entertainment, Inc. *                    18,188
    800         Houghton Mifflin Company                                     39,800
  2,600         Hunt (J. B.) Transport Services, Inc.                        54,438
  1,600         International Dairy Queen, Inc. *                            34,600
  1,500         Luby's Cafeterias, Inc.                                      35,344
  1,100         New England Business Service, Inc.                           21,381
  2,200         Pixar *                                                      42,625
  1,000         Pulitzer Publishing Co.                                      59,313
  1,100         Ruby Tuesday Inc.                                            24,819
  1,200         Sbarro Incorporated                                          30,075
  1,000         Shorewood Packaging Corp. *                                  15,313
  1,500         TCA Cable TV Incorporated                                    45,000
  3,600         USAIR Group Inc. *                                           65,025
  1,400         Wallace Computer Services, Inc.                              83,563
  1,900         World Color Press Inc. *                                     48,213
  1,800         Yellow Corporation *                                         23,738
                                                                           --------
                                                                            901,069
                                                                           --------

                STEEL & IRON  1.16%
  1,500         AK Steel Holding Corp.                                       59,063
  1,800         Birmingham Steel Corporation                                 29,475
  1,000         Carpenter Technology Corporation                             32,000
                                                                           --------
                                                                            120,538
                                                                           --------
                OTHER INDUSTRIAL CYCLICALS  4.00%
  1,800         ACX Technologies, Inc. *                                   $ 36,000
  1,100         Brush Wellman Inc.                                           20,831
  1,000         Carlisle Companies Inc.                                      53,125
  1,200         Cross (A. T.) Company                                        21,225
  2,200         Data General Corporation *                                   28,738
  1,000         Handy and Harman                                             17,000
    600         MAXXAM Inc. *                                                23,550
  2,100         OMI Corporation *                                            18,113
  2,300         Overseas Shipholding Group, Inc.                             41,688
  2,000         Standard Register Company                                    49,375
 11,800         Sunshine Mining Company *                                    15,488
  1,400         Verifone, Inc. *                                             59,413
  1,100         West Company Incorporated                                    33,000
                                                                           --------
                                                                            417,546
                                                                           --------

                UTILITIES  5.57%
  1,000         Central Hudson Gas & Electric Corp.                          31,250
    900         CILCORP Inc.                                                 38,588
  1,200         Eastern Utilities Associates                                 23,550
  1,700         IES Industries, Inc.                                         50,788
  1,867         International CableTel, Inc. *                               55,281
  1,650         MDU Resources Group, Inc.                                    35,475
    900         Orange & Rockland Utilities, Inc.                            33,075
  2,600         Public Service Company of New Mexico                         53,138
  1,500         Sierra Pacific Resources Holding Co.                         38,156
    900         Southern Indiana Gas & Electric Co.                          31,163
  1,980         Tucson Electric Power Company *                              26,978
  2,100         UGI Corporation                                              46,200
    800         U. S. Long Distance Corp. *                                  28,250
  2,500         Vanguard Cellular Systems, Inc. *                            54,844
  1,700         Washington Energy Company                                    33,788
                                                                           --------
                                                                            580,524
                                                                           --------

                MISCELLANEOUS  2.28%
  1,000         Avid Technology Inc. *                                       18,438
  2,700         Bally Entertainment Corporation *                            74,419
  1,100         FoxMeyer Health Corporation                                  16,431
</TABLE>

                 See accompanying notes to financial statements


                                                                              17
<PAGE>   40
GATEWAY SMALL CAP INDEX FUND
Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
 Shares                              Common Stock                             Value
 ------                              ------------                             -----

<S>             <C>                                                     <C>         
                MISCELLANEOUS - Continued
  2,500         Grand Casinos Inc. *                                    $     64,375
  1,300         Kimball International, Inc.                                   35,831
  2,000         Station Casinos, Inc. *                                       28,625
                                                                        ------------
                                                                             238,119
                                                                        ------------

                TOTAL COMMON STOCKS  94.86%                                9,890,365
                (cost $9,265,483)

   Contracts
                PUT OPTIONS ON THE STANDARD & POOR'S 500
                   STOCK INDEX  0.17%
     75         expiring August 16, 1996 at 630                               18,281
                (cost $37,763)

                REPURCHASE AGREEMENT 5.40%
                5% repurchase agreement dated June 28, 1996
                with Star Bank, N.A., due July 1, 1996
               (repurchase proceeds $563,235),
                collateralized by $600,000
                6% GNMA Pool #8974, maturity May 20, 2022
                (market value $607,500)                                      563,000
                                                                        ------------

                TOTAL INVESTMENTS AND REPURCHASE AGREEMENT  100.43%       10,471,646

                OTHER ASSETS AND LIABILITIES, NET (0.43%)
                                                                            (45,160)
                                                                        ------------

                NET ASSETS  100%                                        $10,426,486
                                                                        ===========

                *  Denotes a non-income producing security.

</TABLE>

GATEWAY SMALL CAP INDEX FUND
Statement of Assets and Liabilities - June 30, 1996 (unaudited)

<TABLE>
<S>                                                                    <C>
ASSETS:
Common stocks, at value (original cost $9,265,483)                      $ 9,890,365
Put options, at value (original cost $37,763)                                18,281
Repurchase agreement                                                        563,000
Receivable for fund shares sold                                              15,320
Dividend and interest receivable                                             12,389
Cash                                                                            515
Other assets                                                                 12,261
                                                                        -----------
                                                                         10,512,131
                                                                        ------------

LIABILITIES:
Payable for fund shares redeemed                                             77,222
Other accrued expenses and liabilities                                        8,423
                                                                        ------------
                                                                             85,645
                                                                        ------------
NET ASSETS                                                              $10,426,486
                                                                        ------------

NET ASSETS CONSIST OF:
Paid-in capital applicable to 868,458 shares outstanding
  (unlimited number of shares authorized, no par value)                 $ 9,090,224
Overdistributed net investment income                                          (898)
Accumulated realized gain, net                                              731,760
Unrealized appreciation, net                                                605,400
                                                                        -----------
                                                                        $10,426,486
                                                                        ------------

NET ASSET VALUE, OFFERING, AND REDEMPTION PRICE PER SHARE
                                                                        $     12.01
                                                                        ===========
</TABLE>



                 See accompanying notes to financial statements


                                                                              18
<PAGE>   41
GATEWAY SMALL CAP INDEX FUND                                                    
Statement of Operations - For the Six Months Ended June 30, 1996 (unaudited)    


<TABLE>
<S>                                                                       <C>     
INVESTMENT INCOME:
Dividend income                                                           $ 70,873
Interest income                                                              5,195
                                                                          --------
                                                                            76,068
                                                                          --------

EXPENSES:
Investment advisory and management fees                                     44,601
Transfer agent and accounting fees                                          38,761
Reports to shareholders                                                     10,069
Professional fees                                                            8,249
Registration fees                                                            7,508
Custodian fees                                                               5,701
Trustees' fees                                                               3,744
Other expenses                                                               2,934
                                                                          --------
                                                                           121,567
Fees waived under contract                                                 (44,601)
                                                                          --------
                                                                            76,966
                                                                          --------
NET INVESTMENT LOSS                                                           (898)
                                                                          --------

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Realized gain (loss) on investments:
   Securities                                                              758,640
   Put options expired and closed                                          (60,470)
                                                                          --------
     Net realized gain on investments                                      698,170
                                                                          --------
Change in unrealized appreciation
(depreciation) of investments:
   Securities                                                               89,202
   Put options                                                               6,563
                                                                          --------
     Change in net unrealized appreciation (depreciation)
       of investments                                                       95,765
                                                                          --------


NET REALIZED AND UNREALIZED GAIN
   ON INVESTMENTS                                                          793,935
                                                                          --------

NET INCREASE IN NET ASSETS RESULTING
   FROM OPERATIONS                                                        $793,037
                                                                          ========
</TABLE>

             GATEWAY SMALL CAP INDEX FUND                     
             Statements of Changes in Net Assets (unaudited)  


<TABLE>
<CAPTION>
                                                   Six Months         Year
                                                      Ended           Ended
                                                  June 30, 1996   December 31, 1995
                                                  -------------   -----------------
<S>                                                <C>                <C>           
FROM OPERATIONS:
Net investment income (loss)                       $       (898)      $     8,585
Net realized gain on investments                        698,170           498,112
Change in unrealized appreciation
   (depreciation) of investments                         95,765         1,350,501
                                                   ------------       -----------
Net increase in net assets resulting from               793,037         1,857,198
                                                   ------------       -----------
operations

DIVIDENDS AND DISTRIBUTIONS
   TO SHAREHOLDERS:
From net investment income                                   --            (8,585)
From net realized gain on investments                        --          (538,981)
                                                   ------------       -----------
Decrease in net assets from dividends
   and distributions                                         --          (547,566)
                                                   ------------       -----------

FROM FUND SHARE TRANSACTIONS:
Proceeds from shares sold                               933,304         1,238,323
Net asset value of shares issued in
   reinvestment                                              --           522,299
   of dividends and distributions
Payments for shares redeemed                           (717,892)       (3,309,369)
                                                   ------------       -----------
Net increase (decrease) in net assets from
   fund share transactions                             215,412         (1,548,747)
                                                  ------------        -----------

NET INCREASE (DECREASE) IN NET ASSETS                1,008,449           (239,115)

NET ASSETS:
Beginning of period                                  9,418,037          9,657,152
                                                   -----------        -----------
End of period                                      $10,426,486        $ 9,418,037
                                                   ===========        ===========

FUND SHARE TRANSACTIONS:
Shares sold                                             78,698            117,773
Shares issued in reinvestment of dividends
   and distributions                                         --             47,267
Less shares redeemed                                    (62,338)         (315,501)
                                                   ------------       -----------

NET INCREASE (DECREASE) IN
  SHARES OUTSTANDING                                     16,360          (150,461)
                                                 ==============      ============
</TABLE>

                 See accompanying notes to financial statements


                                                                              19
<PAGE>   42
GATEWAY SMALL CAP INDEX FUND                                                 
Financial Highlights (unaudited)                                             



<TABLE>
<CAPTION>
                                         Six Months       Year Ended        Period Ended
                                           Ended         December 31,       December 31,
                                      June 30, 1996    1995 (5)   1994        1993 (1)
                                      -------------    --------   ----        --------

<S>                                       <C>          <C>       <C>           <C>   
Net asset value, beginning of period      $11.05       $  9.63   $10.35        $10.00
                                          ------       -------   ------        ------

Net investment income (loss)                0.00          0.03    (0.02)         0.04
Net gains (losses) on securities            0.96          2.07    (0.60)         0.61
                                          ------       -------   ------        ------

   Total from investment operations         0.96          2.10    (0.62)         0.65
                                          ------       -------   ------        ------

Dividends from net investment income        0.00         (0.01)    0.00         (0.04)
Distributions from capital gains            0.00         (0.67)   (0.10)        (0.26)
                                          ------       -------   ------        ------

   Total distributions                      0.00         (0.68)   (0.10)        (0.30)
                                          ------       -------   ------        ------

Net asset value, end of period            $12.01        $11.05  $  9.63        $10.35
                                          ======        ======  =======        ======

TOTAL RETURN                                8.69%(3)     21.81%   (5.99%)        6.50%(3)

Net assets, end of period (millions)      $10.43        $ 9.42   $ 9.66        $13.00

Ratio of net expenses to average
   net assets (2)                           1.55%         1.68%    2.00%         1.92%

Ratio of net investment income (loss)
   to average net assets (2)               (0.02%)        0.09%    (0.14%)       0.98%

Portfolio turnover rate                       18%(3)        20%       39%           3%(3)

Average commission per share (4)          $ 0.04           n/a        n/a          n/a
</TABLE>



(1)  The Small Cap Index Fund commenced operations on June 16, 1993.

(2)  The ratios of net expenses to average net assets would have increased
     and the net investment income to average net assets would have decreased by
     0.08% in 1993 had the Adviser not voluntarily reimbursed expenses. These
     ratios are annualized in periods less than a year.

(3)  Not annualized.

(4)  Pursuant to new reporting requirements, average commission per share is
     presented for 1996.

(5)  On December 15, 1995, Gateway Investment Advisers, L.P. became investment
     adviser of the Fund.

NOTES TO FINANCIAL STATEMENTS
June 30, 1996 (unaudited)

1. SIGNIFICANT ACCOUNTING POLICIES
The Gateway Trust (the Trust) is a family of four no-load diversified mutual
funds. The financial statements of Gateway Mid Cap Index Fund (Mid Cap) and
Gateway Small Cap Index Fund (Small Cap), (collectively the Funds), are included
in this report. Gateway Index Plus Fund and the Cincinnati Fund are included in
separate semi-annual reports. The Trust is registered under the Investment 
Company Act of 1940.

The following is a summary of the Funds' significant accounting policies.

INVESTMENTS VALUATION - The Funds normally value common stocks and option
contracts at the average of the closing bid and asked quotations. Other
securities for which market quotations are not readily available are valued at
fair value as determined in good faith under procedures adopted by the board of
trustees.

INVESTMENT TRANSACTIONS, INVESTMENT INCOME, AND EXPENSES - Investment
transactions are recorded on the trade date. Dividend income is recorded on the
ex-dividend date, and interest income is accrued daily. Capital gains and losses
are calculated on an identified cost basis. Expenses that cannot be directly
associated with a specific Trust fund are allocated under policies set by the
board of trustees.

DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS TO SHAREHOLDERS - Distributions from
net investment income and net realized capital gains are recorded on the
ex-dividend date and are declared and paid in December.

FEDERAL INCOME TAXES - The Funds intend to comply with the provisions of
Subchapter M of the Internal Revenue Code applicable to regulated investment
companies and distribute substantially all taxable income to the shareholders.
Based on this policy, the Funds make no provision for income taxes. The cost of
investments is the same for financial reporting and tax purposes. Tax
regulations require the Funds to assume that open option contracts are closed
each year end and include the resulting calculated capital gain or loss in the
determination of federal taxable income.


                 See accompanying notes to financial statements


                                                                              20
<PAGE>   43
NOTES TO FINANCIAL STATEMENTS
June 30, 1996 (unaudited)


REPURCHASE AGREEMENTS - The Funds require the custodian to hold sufficient
collateral to secure repurchase agreements. To reduce the chance of loss in its
repurchase transactions, the Funds enter into repurchase agreements only with
banks that have more than $1 billion in assets and are creditworthy in the
judgment of Gateway Investment Advisers, L.P. (the Adviser).

2.  TRANSACTIONS WITH AFFILIATES
Gateway Investment Advisers, Inc. (GIA) was the investment adviser of the Funds
prior to December 15, 1995. On December 15, 1995, the advisory contracts between
the Funds and GIA were terminated and new contracts were entered into with the
Adviser. There were no changes in the advisory fee, or the computation thereof,
as a result of the new contracts. The Funds pay the Adviser a monthly management
fee computed at an annual rate of 0.90% of the first $50 million of the average
daily net assets of the respective fund, 0.70% of the next $50 million and 0.60%
of all such assets over $100 million.

If total expenses for any fiscal year (excluding taxes, interest, brokerage
commissions, and expenses of an extraordinary nature) exceed 2.00% of Small
Cap's average daily net assets, or 1.50% of Mid Cap's average daily net assets,
the advisory contracts require the Adviser to waive some or all of its advisory
fee as necessary to limit each Fund's expenses to the stated level. For 1996,
the Adviser has agreed to voluntarily waive some or all of its advisory fee if
the Small Cap's expense ratio exceed 1.50%. Any contractual or voluntary waiver,
however, will not exceed the aggregate advisory fee paid by the Fund for the
applicable year. As a result, for the six months ended June 30, 1996, the
Adviser waived advisory fees of $26,715 for Mid Cap and $44,601 for Small Cap.
Additionally for 1996, the Adviser has agreed to reimburse other expenses of Mid
Cap as necessary to limit Mid Cap's expenses to 2.00%, and accordingly
reimbursed $11,044 in expenses.

The Adviser maintains the Funds' accounting records for a monthly fee of $4,000
for each fund. The Adviser also provides shareholder servicing, transfer, and
dividend disbursing agent services for the Trust. The Funds reimburse the
Adviser for the cost to provide these services subject to a minimum monthly fee
of $2,500 and a limitation of 0.20% of average daily net assets.

Each trustee of the Trust who is not affiliated with the Adviser receives an
annual retainer of $3,000, a $500 base fee plus $100 per fund for each meeting
attended, and $200 per fund ($1,000 per fund for the committee chairman) for
each committee meeting attended. The annual retainer and base fee are allocated
among the funds based on the number of shareholders in each fund.

At June 30, 1996, the Adviser held in a fiduciary capacity 56.61% of Mid Cap's
outstanding shares, and 49.41% of Small Cap's outstanding shares.

3.  SECURITIES TRANSACTIONS
For the six months ended June 30, 1996, purchases and proceeds from sales of
common stocks are as follows:

<TABLE>
<CAPTION>
                                                     MID CAP       SMALL CAP
                                                     -------       ---------

<S>                                                  <C>            <C>       
   Purchases of investment securities                $496,635       $1,761,464
   Proceeds from sales of investment securities       515,766        2,061,093
</TABLE>

The Funds may write (sell) call options on stock indexes for cash (that is, "the
option premium") to enhance earnings on the portfolio securities. However, using
these contracts limits the opportunity to participate in appreciation of the
underlying portfolio beyond certain upper limits set by the contracts. The Funds
may also buy put options on stock indexes. The purchase of put options involves
the risk of loss of all or part of the cash paid for the put options. The
liability recorded upon receipt of written option premiums increases to offset
rises and decreases to offset declines in the market value of the hedged
portfolio. Similarly, the value of purchased puts increases to offset declines
and decreases to offset rises in the portfolio value.

4.  UNREALIZED APPRECIATION (DEPRECIATION) ON INVESTMENTS
Unrealized appreciation (depreciation) of common stocks at June 30, 1996, based
on the cost of investments, is as follows:

<TABLE>
<CAPTION>
                                                MID CAP       SMALL CAP
                                                -------       ---------

<S>                                            <C>            <C>       
 Gross unrealized appreciation                 $1,373,999     $1,728,559
 Gross unrealized depreciation                   (374,555)    (1,103,677)
                                               ----------     ----------
 Net unrealized appreciation (depreciation)    $  999,444     $  624,882
                                               ==========     ==========
</TABLE>


                                                                              21
<PAGE>   44
THE GATEWAY TRUST


                               Investment Adviser:
                        Gateway Investment Advisers, L.P.

                             Shareholder Servicing:
                        Gateway Investment Advisers, L.P.

                                    Auditors:
                               Arthur Andersen LLP
                                 Cincinnati, OH

                                   Custodian:
                                 Star Bank, N.A.
                                 Cincinnati, OH

                                    Trustees:
                               Stefen F. Brueckner
                               Kenneth A. Drucker
                                Beverly S. Gordon
                                 R. S. Harrison
                                  John F. Lebor
                                 Walter G. Sall
                              William H. Schneebeck
                                 Peter W. Thayer



                                                                              22
<PAGE>   45
Member of 100% No-Load Mutual Fund Council


                         [insert Statue of Liberty logo]

                                THE GATEWAY TRUST
                              P. O. BOX 45201-5211
                            CINCINNATI, OH 45201-5211
                                 (800) 354-6339
<PAGE>   46
August 6, 1996

Dear         :

We are pleased to enclose your Semi-Annual Report on the Mid Cap and Small Cap
Index Funds. The report provides portfolio values as of June 30, 1996, and
comparative rates of return for the twelve-month, six-month, and three-month
periods ending at mid-year. The second quarter of 1996 marks the sixth
consecutive quarter of gains from both your funds.

Please focus attention on the Co-Portfolio Managers' Report on pages 2 and 3.
Co-portfolio managers Pete Thayer and Patrick Rogers discuss stock market
returns, the effects of risk-reducing hedging transactions, dividend
distributions, and fund operating expenses. It is the combination of these
factors that gives each of the two funds a different risk profile than that
which characterizes their respective sector portfolios.

On behalf of the entire staff at Gateway, we appreciate the confidence you have
placed with us. We look forward to continuing to help you meet your investment
goals!

Cordially,


/s/Walter G. Sall
- -------------------------
Walter G. Sall
Chairman
<PAGE>   47
                                  CINCINNATI
                                     FUND




                                 SEMI-ANNUAL
                                    REPORT
                                     1996




                                  CINCINNATI
                                     FUND
                 P.O. BOX 5211 / CINCINNATI, OHIO 45201-5211
                                (800) 354-5525
<PAGE>   48
                                 CINCINNATI FUND
                           Highlights at June 30, 1996

<TABLE>
<CAPTION>
                                               AVERAGE ANNUAL TOTAL RETURN
                                    ---------------------------------------------------
                                                                            Since
                             Past     One     Three    Five      Ten      Inception       Price
                            Quarter   Year    Years    Years    Years     on 11/7/94    Per Share
                            -------   ----    -----    -----    -----     ----------    ---------
<S>                          <C>     <C>       <C>      <C>      <C>        <C>            <C>
Cincinnati Fund              1.55%   26.77%    n/a      n/a      n/a        26.72%         $14.45

S&P 500                      4.49    26.00     17.22     15.73   13.78

Lehman Gov't/Corp. Bond      0.47     4.66      5.16      8.48    8.41

U. S. Inflation (CPI)        0.67     2.79      2.77      2.88    3.66
</TABLE>


<TABLE>
<CAPTION>
                                               CUMULATIVE TOTAL RETURN
                            ---------------------------------------------------------

                              Past    One     Three    Five     Ten   Since Inception
                            Quarter   Year    Years    Years   Years     on 11/7/94
                            -------   ----    -----    -----   -----  --------------- 
<S>                          <C>     <C>      <C>      <C>     <C>         <C>
Cincinnati Fund              1.55%   26.77%    n/a     n/a        n/a      47.68%

S&P 500                      4.49    26.00    61.08    107.59  263.57

Lehman Gov't/Corp. Bond      0.47     4.66    16.29     50.24  124.25

U. S. Inflation (CPI)        0.67     2.79     8.55     15.26   43.25
</TABLE>

Performance data throughout this report represents past performance. The average
annual total return figures assume the reinvestment of dividends. Your
investment return and principal value of an investment will fluctuate so that
your shares, when redeemed, may be worth more or less than the original cost.


                                                               CINCINNATI FUND 1
<PAGE>   49
                                 CINCINNATI FUND

                            Letter from the Chairman

Dear Shareholder:

We are pleased to report that, historically, and currently, the Greater
Cincinnati Area is a great place to invest. In the first half of 1996, the
Cincinnati Fund's portfolio of companies that conduct business locally has
continued its fine record of growth.

In this report, portfolio manager Patrick Rogers explains the current
portfolio mix and changes made in security positions over the past six months.
I have great confidence that Cincinnati will remain an excellent city in which
to live and transact business. Its virtues should allow the companies that
comprise the Cincinnati Fund to provide continued opportunities for long-term
growth.

Finally, I take great pleasure in announcing the appointment of R. S. Harrison
to The Gateway Trust Board of Trustees. Mr. Harrison is chairman of Baldwin
Piano & Organ Co. and serves as a director of several corporations. He brings a
wealth of financial and managerial skills with him, and, on behalf of fellow
boardmembers and shareholders, I welcome him to the Board of Trustees.

Cordially,


/s/ Walter G. Sall
Walter G. Sall
Chairman


2  CINCINNATI FUND
<PAGE>   50
                                 CINCINNATI FUND

                           Portfolio Manager's Report

The Cincinnati Fund continued to post impressive gains during the first six
months of 1996, producing a total return of 10.14%. This performance is
slightly ahead of the 10.10% for the S&P 500 Stock Index over the same time
period. Since inception on November 7, 1994, the Cincinnati Fund has produced
a total return of 47.68%, which is 26.72% annualized.

<TABLE>
<CAPTION>
- ----------------------------------------------------------
                    Top Ten Holdings
                   As of June 30, 1996
- ----------------------------------------------------------
<S>                                               <C>  
Cinergy Corp.                                     6.00%
Kroger Co.                                        5.46%
Procter & Gamble Co.                              5.33%
Cincinnati Bell Inc.                              4.77%
General Electric Company                          4.29%
Comair Holdings, Inc.                             3.91%
Cincinnati Financial Corp.                        3.86%
Federated Department Stores, Inc.                 2.58%
Structural Dynamics Research Corp.                2.57%
Star Banc Corp.                                   2.55%
- ----------------------------------------------------------
</TABLE>


A comparison of the top ten holdings as of June 30, 1996 to year end 1995
includes:

      -  Cinergy, the parent company of Cincinnati Gas & Electric, is now the
         top holding in the Fund. Our local utility company boasts two favorable
         investment characteristics: an above-average dividend yield and a
         strong position to prosper during a period of deregulation and
         consolidation in the utility industry.

      -  Comair, the area's regionally based airline and "Delta Connection"
         carrier, has enjoyed tremendous growth over the past eighteen months.
         Since March 1995, we have steadily increased our position in Comair to
         a level where it is now one of the top ten holdings in the Fund.

                                                               CINCINNATI FUND 3
<PAGE>   51
                                 CINCINNATI FUND

                           Portfolio Manager's Report

      -  Structural Dynamics Research Corp. (SDRC) also populates the top ten
         holdings for the first time. The Milford-based developer of engineering
         computer software has also enjoyed outstanding growth over the past two
         years. Earlier this year, SDRC announced the signing of a much
         anticipated, five-year, $200 million contract with Ford Motor Company.

      -  We have slightly reduced our weighting in Star Bank. This is not a
         result of any fundamental change in Cincinnati's second largest bank.
         Rather, Star Bank's stock has risen 100% over the past eighteen months,
         reaching a price of $70.00 per share. At this price level, we decided
         to realize gains in the portfolio.

                            Largest Sector Weightings

Although the finance sector remains the largest industry weighting, its
allocation is slightly lower than at year end. This is due mainly to small
decreases in positions of Cincinnati's three largest banks: Fifth Third,
Provident, and Star.

The services industry has an increased allocation from year end. A higher
weighting in Comair and Jacor Communications has led this sector to the second
highest in the Cincinnati Fund.

                             Additions and Deletions

The Cincinnati Fund added two new stocks to the portfolio during the first half
of 1996. Duke Realty Investments, Inc. and Ashland Oil, Inc. have met the
criteria to be included in the Fund and serve as excellent diversifiers for the
portfolio. One of our concerns for the Fund is the impact of higher inflation on
the portfolio. The inclusion of these two stocks should help mitigate any
negative effects should inflation rise.

Duke Realty is an Indianapolis-based real estate firm engaged in the development
and management of industrial, office, and retail properties. Their presence in
Cincinnati is extensive, particularly in downtown and suburban office space.

4  CINCINNATI FUND
<PAGE>   52
                                 CINCINNATI FUND

                           Portfolio Manager's Report

Ashland Oil, Inc. is a leading independent petroleum refiner, producing a full
range of products, including Valvoline Motor Oil. The Ashland, Kentucky-based
company also manufactures chemicals and engages in oil and gas explorations,
highway construction, and coal mining. Their presence in Cincinnati is larger
than you may think. Our area is "home" to forty-one SuperAmerica stations, the
company's retailer of its gasoline products. Additionally, the company has
twenty Valvoline Instant Oil Change locations in the Tri-state. Finally, Ashland
Oil has a large distribution and storage facility along the Ohio River in
western Hamilton County.

A few stocks were removed from the portfolio during the first six months of
1996. Kentucky Enterprise Bank was merged into Fifth Third Bancorp. Manhattan
Life Insurance was removed due to the lack of liquidity necessary for a stock to
be held in the Fund. Lastly, due to the recent appointment of Mr. R. S. Harrison
to the Fund's Board of Trustees, the Cincinnati Fund was required to sell its
entire position of Baldwin Piano and Organ Co. Mr. Harrison is Baldwin's
chairman.

Since its inception, we have enjoyed a terrific period of stock market growth in
the Cincinnati Fund. As we stated in the annual report a few months ago, history
tells us that this type of growth is not sustainable. However, we believe the
Cincinnati Fund remains an excellent vehicle for investors interested in
long-term growth of capital. We look forward to the challenges during the
remainder of 1996 and the years to come.


/s/ J. Patrick Rogers
J. Patrick Rogers, CFA
Portfolio Manager

                                                               CINCINNATI FUND 5
<PAGE>   53
                                 CINCINNATI FUND
                       Industry Weightings - June 30, 1996

                               [insert pie chart}

<TABLE>
<S>                         <C>   
Utilities                   13.04%

Finance                     15.95%

Industrial Cyclicals         9.54%

Energy                       1.03%

Consumer Durables            4.52%

Consumer Staples             9.22%

Services                    14.95%

Retail                      11.42%

Health                       5.75%

Technology                   9.44%
</TABLE>

                          As a percentage of net assets

6  CINCINNATI FUND
<PAGE>   54
                                 CINCINNATI FUND
              Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
   Shares                          Common Stocks                                  Value
<S>                  <C>                                                    <C>    
                     UTILITIES  13.04%

    2,800            AT&T Corporation                                       $   173,950
    7,000            Cincinnati Bell Inc.                                       365,750
   14,400            Cinergy Corp.                                              459,900
                                                                            -----------
                                                                                999,600
                                                                            -----------
                     ENERGY  1.03%

    2,000            Ashland Oil Inc.                                            79,250
                                                                            -----------

                     FINANCE  15.95%

    2,500            American Annuity Group, Inc.                                32,656
    1,000            American Financial Enterprises, Inc.                        24,500
    1,800            American Financial Group, Inc.                              54,450
      660            Banc One Corp.                                              22,481
    5,143            Cincinnati Financial Corp.                                 296,044
    2,500            Duke Realty Investments, Inc.                               75,625
    2,123            Fifth Third Bancorp                                        114,377
      700            First Financial Bancorp                                     22,838
      840            Huntington Bancshares Inc.                                  20,160
    3,300            McDonald & Company Investments, Inc.                        64,763
      800            Midland Co.                                                 33,600
    3,000            Ohio Casualty Corp.                                        105,000
      800            PNC Bank Corp.                                              23,800
    3,450            Provident Bancorp, Inc.                                    122,044
    2,900            Star Banc Corp.                                            195,569
    1,000            Suburban Bancorporation, Inc.                               14,750
                                                                            -----------
                                                                              1,222,657
                                                                            -----------
                     INDUSTRIAL CYCLICALS  9.54%

    4,000            AK Steel Holding Corp.                                     157,500
      800            Champion International Corp.                                33,300
    3,700            Chemed Corporation                                         137,363
    7,000            Cincinnati Milacron, Inc.                                  168,000
      300            Corning Inc.                                                11,531
      600            International Paper Co.                                     22,163
    5,000            LSI Industries Inc.                                         85,000
    1,500            Monsanto Company                                            48,656
    4,300            Multi-Color Corp. *                                         29,025
    6,000            NS Group, Inc. *                                            18,000
    1,500            Zaring Homes, Inc. *                                        20,063
                                                                            -----------
                                                                                730,601
                                                                            -----------
</TABLE>

                 See accompanying notes to financial statements


                                                               CINCINNATI FUND 7
<PAGE>   55
                                 CINCINNATI FUND
              Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
   Shares                                    Common Stocks                       Value
<S>                  <C>                                                  <C>         
                     CONSUMER DURABLES  4.52%

    1,800            Cintas Corp.                                         $     95,625
    4,500            Ford Motor Company                                        145,688
    1,600            General Motors Corp.                                       83,800
      600            Hasbro, Inc.                                               21,488
                                                                          ------------
                                                                               346,601
                                                                          ------------
                     CONSUMER STAPLES  9.22%

      800            Avon Products, Inc.                                        36,100
    3,500            Chiquita Brands International, Inc.                        45,719
    1,800            Heinz (H. J.) Co.                                          54,675
    3,600            PepsiCo, Inc.                                             127,575
    4,500            Procter & Gamble Co.                                      408,094
      300            Sara Lee Corp.                                              9,713
    1,500            Super Food Services, Inc.                                  14,250
      300            Sysco Corp.                                                10,256
                                                                          ------------
                                                                               706,382
                                                                          ------------
                     SERVICES  14.95%

    1,800            Citicasters Inc.                                           56,475
   11,025            Comair Holdings, Inc.                                     299,742
      200            CSX Corp.                                                   9,650
    2,300            Delta Air Lines, Inc.                                     190,756
    4,222            Frisch's Restaurants, Inc.                                 49,081
    1,200            Gannett Co., Inc.                                          84,900
    5,300            Gibson Greetings, Inc. *                                   73,206
    4,500            Jacor Communications, Inc. *                              139,781
    1,800            McDonald's Corp.                                           84,038
    2,300            Scripps (E. W.) Co.                                       107,381
    3,000            Skyline Chili, Inc. *                                      12,188
      600            Time Warner, Inc.                                          23,513
      800            Wendy's International, Inc.                                14,900
                                                                           -----------
                                                                             1,145,611
                                                                          ------------
                     RETAIL  11.42%

    5,800            Federated Department Stores, Inc. *                       197,925
   10,600            Kroger Co. *                                              418,700
    2,700            Mercantile Stores Company, Inc.                           157,950
    1,000            Nine West Group, Inc. *                                    51,000
    1,400            Winn Dixie Stores, Inc.                                    49,438
                                                                           -----------
                                                                               875,013
                                                                          ------------
</TABLE>

                 See accompanying notes to financial statements

8  CINCINNATI FUND
<PAGE>   56
                                 CINCINNATI FUND
              Portfolio of Investments - June 30, 1996 (unaudited)

<TABLE>
<CAPTION>
   Shares                                    Common Stocks                              Value
<S>                  <C>                                                         <C>         
                     HEALTH  5.75%

    5,500            Duramed Pharmaceuticals, Inc. *                             $     83,188
    2,600            Johnson & Johnson                                                128,863
    4,522            Meridian Diagnostics, Inc.                                        69,243
    6,000            Omnicare, Inc.                                                   159,000
                                                                                  -----------
                                                                                      440,294
                                                                                  -----------
                     TECHNOLOGY  9.44%

    4,500            Cincinnati Microwave Inc. *                                       16,031
    3,800            General Electric Company                                         328,455
      800            International Business Machines Corp.                             79,250
    4,000            International Lottery, Inc. *                                     41,500
      300            Litton Industries, Inc. *                                         13,088
    3,300            Pomeroy Computer Resources, Inc. *                                48,263
    9,000            Structural Dynamics Research Corp. *                             196,875
                                                                                  -----------
                                                                                      723,462
                                                                                  -----------
                     TOTAL COMMON STOCKS  94.86%                                    7,269,471
                     (Cost $5,442,513)

                     REPURCHASE AGREEMENT 6.03%
                     5% repurchase agreement dated June 28, 1996 with
                     Star Bank, N.A., due July 1, 1996 (repurchase
                     proceeds $462,193), collateralized by $495,000
                     6% GNMA Pool #8974, maturity May 20, 2022
                     (market value $501,187)                                          462,000

                     OTHER ASSETS AND LIABILITIES, NET (0.89%)                        (68,007)
                                                                                 ------------

                     NET ASSETS  100%                                              $7,663,464
                                                                                 ============
</TABLE>

                     *   Denotes a non-income producing security.

                 See accompanying notes to financial statements

                                                               CINCINNATI FUND 9
<PAGE>   57
                                 CINCINNATI FUND

         Statement of Assets and Liabilities - June 30, 1996 (unaudited)

<TABLE>
<S>                                                                         <C>       
   ASSETS:
   Common stocks, at value (original cost $5,442,513)                       $7,269,471
   Repurchase agreement                                                        462,000
   Dividend and interest receivable                                              6,842
   Receivable for fund shares sold                                               2,338
   Cash                                                                            847
   Other assets                                                                 13,163
                                                                            ----------
                                                                             7,754,661
                                                                            ----------
   LIABILITIES:

   Payable for fund shares redeemed                                             83,427
   Accrued expenses and liabilities                                              7,770
                                                                            ----------
                                                                                91,197
                                                                            ----------
   NET ASSETS                                                               $7,663,464
                                                                            ==========
   NET ASSETS CONSIST OF:

   Paid-in capital applicable to 530,337 shares outstanding
     (unlimited number of shares authorized, no par value)                  $5,764,546
   Undistributed net investment income                                           3,417
   Accumulated realized gain, net                                               68,543
   Unrealized appreciation, net                                              1,826,958
                                                                            ----------
                                                                            $7,663,464
                                                                            ==========
   NET ASSET VALUE, OFFERING, AND REDEMPTION
     PRICE PER SHARE                                                            $14.45
                                                                            ==========
 </TABLE>

                 See accompanying notes to financial statements

10  CINCINNATI FUND
<PAGE>   58
                                 CINCINNATI FUND

                             Statement of Operations
               For the Six Months Ended June 30, 1996 (unaudited)

<TABLE>
<S>                                                                    <C>         
   INVESTMENT INCOME:
   Dividend income                                                     $     50,951
   Interest income                                                           21,022
                                                                       ------------
                                                                             71,973
                                                                       ------------
   EXPENSES:

   Transfer agent and accounting fees                                        38,760
   Investment advisory and management fees                                   17,177
   Professional fees                                                          7,256
   Reports to shareholders                                                    6,843
   Custodian fees                                                             4,425
   Trustees' fees                                                             3,366
   Registration fees                                                          1,181
   Other expenses                                                             1,319
                                                                       ------------
                                                                             80,327

   Fees waived under contract                                               (11,315)
   Fees waived voluntarily                                                     (456)
                                                                       ------------
                                                                             68,556
                                                                       ------------
   NET INVESTMENT INCOME                                                      3,417
                                                                       ------------
   REALIZED AND UNREALIZED GAIN ON INVESTMENTS:

   Net realized gain on investments                                          66,677
   Change in net unrealized appreciation of investments                     574,603
                                                                       ------------
   NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS                          641,280
                                                                       ------------

   NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                 $   644,697
                                                                       ============
</TABLE>

                 See accompanying notes to financial statements

                                                              CINCINNATI FUND 11
<PAGE>   59
                                 CINCINNATI FUND
                 Statement of Changes in Net Assets (unaudited)

<TABLE>
<CAPTION>
                                                                 Six Months Ended         Year Ended
                                                                   June 30, 1996       December 31, 1995

   FROM OPERATIONS:
<S>                                                             <C>                     <C>          
   Net investment income                                        $        3,417          $      21,591
   Net realized gain on investments                                     66,677                 96,868
   Change in unrealized appreciation (depreciation)
   of investments                                                      574,603              1,284,165
                                                                  ------------            -----------

   Net increase in net assets resulting from operations                644,697              1,402,624
                                                                  ------------            -----------

   DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS:

   From net investment income                                               --                (31,594)
   From net realized gain on investments                                    --                (95,002)
                                                                --------------          -------------
   Decrease in net assets from dividends and distributions                  --               (126,596)
                                                                --------------           ------------

   FROM FUND SHARE TRANSACTIONS:

   Proceeds from shares sold                                         1,581,118              1,642,766
   Net asset value of shares issued in reinvestment of
     dividends and distributions                                            --                123,748
   Payments for shares redeemed                                       (439,209)              (390,897)
                                                                  ------------           ------------
   Net increase in net assets from fund share transactions           1,141,909              1,375,617
                                                                   -----------            -----------

   NET INCREASE IN NET ASSETS                                        1,786,606              2,651,645

   NET ASSETS:

   Beginning of period                                               5,876,858              3,225,213
                                                                   -----------            -----------
   End of period, including undistributed net
     investment income of $3,417 and $0, respectively               $7,663,464             $5,876,858
                                                                    ==========             ==========

   FUND SHARE TRANSACTIONS:

   Shares sold                                                         113,453                144,900
   Shares issued in reinvestment of dividends and distributions             --                  9,432
   Less shares redeemed                                                (31,204)               (31,771)
                                                                 -------------          -------------

   NET INCREASE IN SHARES OUTSTANDING                                   82,249                122,561
                                                                 =============           ============
</TABLE>

                 See accompanying notes to financial statements

12  CINCINNATI FUND
<PAGE>   60
                                 CINCINNATI FUND

                        Financial Highlights (unaudited)


<TABLE>
<CAPTION>
                                                    Six Months           Year Ended         Period Ended
                                                       Ended            December 31,        December 31,
                                                   June 30, 1996          1995 (5)            1994 (1)
                                                   -------------          ----                ----    
<S>                                                    <C>                <C>                 <C>   
   Net asset value, beginning of period                $13.12             $  9.91             $10.00
                                                       ------             -------             ------

   Net investment income                                 0.01                0.04               0.03
   Net gains (losses) on securities                      1.32                3.46              (0.12)
                                                      -------             -------            -------

      Total from investment operations                   1.33                3.50              (0.09)
                                                      -------             --------           -------

   Dividends from net investment income                  0.00               (0.07)              0.00
   Distributions from capital gains                      0.00               (0.22)              0.00
                                                      -------             --------           -------

     Total distributions                                 0.00               (0.29)              0.00
                                                      -------             -------            -------

   Net asset value, end of period                      $14.45              $13.12            $  9.91
                                                       ======              ======            =======

   TOTAL RETURN                                        10.14% (3)           35.31%            (0.90%) (3)

   Net assets, end of period (millions)                 $7.66               $5.88               $3.23

   Ratio of net expenses to average net                 1.99%               1.98%               1.96%
   assets (2)

   Ratio of net investment income to

     average net assets (2)                             0.10%               0.46%               2.24%

   Portfolio turnover rate                                 4% (3)              9%                 0% (3)
 
   Average commission per share (4)                     $0.04                 n/a                n/a
</TABLE>


   (1)  The Cincinnati Fund commenced operations on November 7, 1994.
   (2)  The ratio of net expenses to average net assets would have increased and
        the ratio of net investment income to average net assets would have
        decreased by 0.01%, 0.02%, and 0.04% in 1996, 1995, and 1994,
        respectively, had the Adviser not voluntarily reimbursed expenses and
        waived fees. Ratios are annualized in periods less than a year.
   (3)  Not annualized.
   (4)  Pursuant to new reporting requirements, average commission per share is
        presented for 1996.
   (5)  On December 15, 1995, Gateway Investment Advisers, L.P. became
        investment adviser to the Fund.

                 See accompanying notes to financial statements

                                                              CINCINNATI FUND 13
<PAGE>   61
                                 CINCINNATI FUND

            Notes to Financial Statements - June 30, 1996 (unaudited)



  1.  SIGNIFICANT ACCOUNTING POLICIES
  The Gateway Trust (the Trust) is a family of four no-load diversified mutual
  funds. The financial statements of the Cincinnati Fund (the Fund) are included
  in this report. The Fund commenced operations on November 7, 1994. Gateway
  Index Plus Fund, Gateway Mid Cap Index Fund, and Gateway Small Cap Index Fund
  are included in separate semi-annual reports. The Trust is registered under
  the Investment Company Act of 1940.

  The following is a summary of the Fund's significant accounting policies.

  INVESTMENTS VALUATION - The Fund normally values common stocks at the average
  of the closing bid and asked quotations. Other securities for which market
  quotations are not readily available are valued at fair value as determined in
  good faith under procedures adopted by the board of trustees.

  INVESTMENT TRANSACTIONS, INVESTMENT INCOME, AND EXPENSES - Investment
  transactions are recorded on the trade date. Dividend income is recorded on
  the ex-dividend date, and interest income is accrued daily. Capital gains and
  losses are calculated on an identified cost basis. Expenses that cannot be
  directly associated with a specific Trust fund are allocated under policies
  set by the board of trustees.

  DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS TO SHAREHOLDERS - Distributions from
  net investment income and net realized capital gains are recorded on the
  ex-dividend date and are declared and paid in December.

  FEDERAL INCOME TAXES - The Fund intends to comply with the provisions of
  Subchapter M of the Internal Revenue Code applicable to regulated investment
  companies and distribute substantially all of its taxable income to
  shareholders. Based on this policy, the Fund makes no provision for income
  taxes. The cost of investments is the same for financial reporting and tax
  purposes.

  REPURCHASE AGREEMENTS - The Fund requires the custodian to hold sufficient
  collateral to secure repurchase agreements. To reduce the chance of loss in
  its repurchase transactions, the Fund enters into repurchase agreements only
  with banks that have more than $1 billion in assets and are creditworthy in
  the judgment of Gateway Investment Advisers, L.P. (the Adviser).

14  CINCINNATI FUND
<PAGE>   62
                                 CINCINNATI FUND

            Notes to Financial Statements - June 30, 1996 (unaudited)



  2.  TRANSACTIONS WITH AFFILIATES
  Gateway Investment Advisers, Inc. (GIA) was the investment adviser of the Fund
  prior to December 15, 1995. On December 15, 1995, the advisory contract
  between the Fund and GIA was terminated and a new contract was entered into
  with the Adviser. There were no changes in the advisory fee, or the
  computation thereof, as a result of the new contract. The Fund pays the
  Adviser a monthly management fee computed at an annual rate of 0.50% of its
  average daily net assets.

  If total expenses for any fiscal year (excluding taxes, interest, brokerage
  commissions, and expenses of an extraordinary nature) exceed 2.00% of average
  daily net assets, the Adviser has agreed to reduce its fee as necessary to
  limit the Fund's expenses to this level. As a result for the six months ended
  June 30, 1996, the Adviser waived management fees of $11,771.

  The Adviser maintains the Fund's accounting records for a monthly fee of
  $4,000. The Adviser also provides shareholder servicing, transfer, and
  dividend disbursing agent services for the Trust. The Fund reimburses the
  Adviser for the cost to provide these services subject to a minimum monthly
  fee of $2,500 and a limitation of 0.20% of average daily net assets.

  Each trustee of the Trust who is not affiliated with the Adviser receives an
  annual retainer of $3,000, a $500 base fee plus $100 per fund for each meeting
  attended, and $200 per fund ($1,000 for the committee chairman) for each
  committee meeting attended. The annual retainer and base fee are allocated
  among the funds based on the number of shareholders in each fund.

  At June 30, 1996, the Adviser held in a fiduciary capacity 15.02% of the
  outstanding shares of the Fund.

  3.  SECURITIES TRANSACTIONS
  For the six months ended June 30, 1996, purchases of investment securities
  (excluding short-term investments) totaled $1,711,371, and proceeds from sales
  totaled $244,382.

  4.  UNREALIZED APPRECIATION (DEPRECIATION) ON INVESTMENTS
  At June 30, 1996, gross unrealized appreciation of common stocks totaled
  $1,868,841 and gross unrealized depreciation totaled ($41,883), based on the
  cost of investments.


                                                              CINCINNATI FUND 15

<PAGE>   63
                                 CINCINNATI FUND

                       Professional Services and Trustees


                               Investment Adviser:
                        Gateway Investment Advisers, L.P.

                             Shareholder Servicing:
                        Gateway Investment Advisers, L.P.

                                    Auditors:
                               Arthur Andersen LLP
                                 Cincinnati, OH

                                   Custodian:
                                 Star Bank, N.A.
                                 Cincinnati, OH

                                    Trustees:
                               Stefen F. Brueckner
                               Kenneth A. Drucker
                                Beverly S. Gordon
                                 R. S. Harrison
                                  John F. Lebor
                                 Walter G. Sall
                              William H. Schneebeck
                                 Peter W. Thayer

16  CINCINNATI FUND
<PAGE>   64
                              INVEST IN CINCINNATI
                             INVEST IN YOUR FUTURE!


                     [insert picture of Cincinnati skyline]


BEFORE YOU LOOK VERY FAR, CONSIDER THE POTENTIAL OF THE COMPANIES CLOSEST TO
YOU. THEN CONSIDER THE CINCINNATI FUND. A 100% NO-LOAD MUTUAL FUND FEATURING A
DIVERSE GROUP OF HOMETOWN STOCKS.

                                   CINCINNATI
                                      FUND
                            248-2300 * (800)354-5525

ONE-YEAR
TOTAL RETURN
26.77%
PERIOD ENDING 6/30/96

AVERAGE ANNUAL
TOTAL RETURN
SINCE INCEPTION
11/7/97-6/30/96
26.72%

PERFORMANCE DATA QUOTED REPRESENTS PAST PERFORMANCE AND IS NO GUARANTEE OF
FUTURE RESULTS. YOUR INVESTMENT RETURN AND PRINCIPAL VALUE OF AN INVESTMENT WILL
FLUCTUATE SO THAT YOUR SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THE
ORIGINAL COST.

      This report must be preceded or accompanied by a current prospectus.

<PAGE>   65
                                 August 16, 1996






Dear:

         We are pleased to enclose your Semi-Annual Report on the Cincinnati
Fund. The report provides portfolio values as of June 30, 1996, and comparative
rates of return for the twelve-month, six-month, and three-month periods ending
at mid-year. The second quarter of 1996 marks the sixth consecutive quarter of
gains from your fund.

         Please focus attention on the Portfolio Manager's Report on pages 3
through 5. Portfolio Manager Patrick Rogers discusses stock market returns, the
effects of the weightings of various industry groups, and some of the changes
that aided the Fund's investment results in the first six months of 1996. It is
the combination of these factors that gives the Cincinnati Fund the excellent
returns it has enjoyed since its inception in November 1994.

         On behalf of our entire staff, we appreciate the confidence you have
placed with us. We look forward to continuing to help you meet your investment
goals!

                                                     Sincerely,



                                                     /s/ Walter G. Sall
                                                     ---------------------------
                                                     Walter G. Sall
                                                     Chairman



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