PUTNAM OTC EMERGING GROWTH FUND
N-30D, 1994-03-29
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Putnam 
OTC Emerging 
Growth Fund 

Semiannual 
Report 
January 31, 1994 

For investors 
aggressively seeking 
capital appreciation 
through "emerging 
growth" stocks traded 
in the over-the-counter 
(OTC) market 

A member 
of the Putnam 
Family of Funds 

 Contents
 2   How your fund performed
 3   From the chairman
 4   Report from Putnam Management 
     Semiannual Report 
 6   Portfolio of investments owned 
 9   Financial statements 
18   Fund performance supplement 
19   Your Trustees 

<PAGE>
 

How your 
fund performed 
For periods ended January 31, 1994 

<TABLE>
<CAPTION>
Total return*                       Fund                   NASDAQ        S&P 
                          Class A            Class B   Industrial        500 
                        NAV      POP      NAV      CDSC     Index      Index 
<S>                   <C>      <C>       <C>       <C>     <C>        <C>
6 months               21.15%   14.22%   20.81%    15.81%   16.80%      8.94% 
1 year                 33.20    25.60      --        --     12.78      12.79 
5 years               135.30   121.77      --        --    111.32      89.75 
 annualized            18.67    17.27      --        --     16.14      13.67 
10 years              434.19   403.78      --        --    173.24     316.74 
 annualized            18.24    17.55      --        --     10.57      15.34 
Life-of-class+ 
  (class B shares)      --       --      19.70     14.70    14.88       8.70 
</TABLE>

<TABLE>
<CAPTION>
                                        Class 
                                   Class    A       B 
<S>                          <C>        <C>        <C>     
Share data                      NAV        POP        NAV 
July 31, 1993                $10.72     $11.37     $10.70 
January 31, 1994             $11.73     $12.45     $11.67 

</TABLE>

<TABLE>
<CAPTION>
                         Investment  Capital 
Distributions(a) Number      Income    Gains    Total 
<S>                   <C>        <C>   <C>       <C>
Class A               1          --    $1.20     $1.20 
Class B               1          --    $1.20     $1.20
</TABLE>
Total return at end of most recent calendar quarter 
Periods ended December 31, 1993 
<TABLE>
<CAPTION>
                              Class A           Class B 
                         NAV      POP     NAV      CDSC 
<S>                   <C>      <C>        <C>       <C>
1 year                 32.05%   24.40%     --        -- 
5 years               143.86   129.93      --        -- 
 annualized            19.52    18.12      --        -- 
10 years              392.97   364.18      --        -- 
 annualized            17.30    16.59      --        -- 
Life-of-class+ 
  (class B shares)      --       --     16.82%     11.82% 
</TABLE>

* Performance data represent past results. Investment return and principal 
value will fluctuate so that an investor's shares, when redeemed, may be 
worth more or less than their original cost. 

+ The fund began operations on November 1, 1992, offering shares now known as 
class A. Effective July 15, 1993, the fund began offering class B shares. 
Performance for each share class will differ. 

Terms you need to know 

Total return is the change in value of an investment from the beginning to 
the end of a period, assuming the reinvestment of all distributions. It may 
be shown at net asset value or at public offering price. 

Net asset value (NAV) is the value of all your fund's assets, minus any 
liabilities, divided by the number of outstanding shares, not reflecting any 
sales charge. 

Public offering price (POP) is the price of a mutual fund share plus the 
maximum sales charge levied at the time of purchase. 

Contingent deferred sales charge (CDSC) is a charge applied at the time of 
the redemption of shares rather than the time of purchase. It generally 
declines and eventually disappears over a stated period. 

Class A shares are the shares of your fund offered subject to an initial 
sales charge. Your fund's POP includes the maximum 5.75% sales charge. 

Class B shares are the shares of your fund offered with no initial sales 
charge. Within the first six years of purchase, they are subject to a CDSC 
declining from 5% to 1%. After the sixth year, the CDSC no longer applies. 

Please see the fund performance supplement on page 18 for additional 
information about performance comparisons. 

<PAGE>
 

From the 
Chairman 

[George Putnam photo] 

George Putnam 
Chairman of the Trustees 
(C) Karsh, Ottawa 

Dear Shareholder: 

Investors seeking growth of their assets through common stocks have enjoyed 
consistent increases in the value of their holdings over the past several 
months, thanks to a general rise in the stock market. Those with experience 
extending over many years also realize that such uptrends do not proceed in 
straight lines. Inevitably, there will be periods of interruption as the 
market responds to various forces, with occasional declines, or 
"corrections." 

Rather than view these interruptions with dismay, experienced investors take 
them in stride. Some portfolio managers, in fact, regard them as 
opportunities to exchange holdings that are no longer appropriate in the 
portfolio for those with brighter prospects, or to lower the average cost of 
holdings by acquiring additional shares at bargain prices. 

Daniel L. Miller, who recently assumed the reins of Putnam OTC Emerging 
Growth Fund, is well acquainted with this philosophy. As he notes in the 
Report from Putnam Management that follows, the over-the-counter market in 
which the fund shops for emerging growth stocks has been in a three-year 
uptrend. Consequently, he is prepared to use any corrections as an 
opportunity to upgrade the fund's portfolio. 

Dan is no newcomer to Putnam; he joined us in 1983 as a securities analyst, 
working his way up to portfolio manager in the Specialty Growth Equities 
Group. He is a seasoned participant in Putnam's team approach to investment 
management. We look forward to the continued success of your fund under his 
guiding hand. 

Respectfully yours, 

(Signature of George Putnam) 
George Putnam 
March 16, 1994 

<PAGE>
 

Report from 
Putnam Management 

During the six months ended January 31, 1994, we took full advantage of the 
continuing recovery in the stocks of small to medium-sized growth companies 
to produce particularly strong performance for Putnam OTC Emerging Growth 
Fund. The result was a total return at net asset value for both the fund's 
class A and class B shares well above that of the average growth stock, as 
measured by the NASDAQ Industrial Index, and the stock market in general, as 
measured by the Standard & Poor's(R) 500 Index. 

Results for the 12 months ending on the same date were even more impressive. 
Comparisons against the NASDAQ and S&P 500 indexes for those and other 
periods are shown in the table on page 2. 

Industry recognition We are also pleased to note that the fund's performance 
has attracted the favorable attention of several independent mutual fund 
watchers. 

**Morningstar Mutual Funds maintained the fund's above-average four-star 
rating relative to funds with similar objectives as of January 31, 1994. 
Morningstar's risk-adjusted rankings are based on medium- and long-range 
performance results, and are subject to revision every two weeks. 

**Lipper Analytical Services ranked the fund seventh of 173 small-company 
growth funds for the 12 months ended January 31, 1994. This mutual fund 
tracking service also ranked the fund third of 32 funds in existence for 10 
years as of the same date. 

**CDA/Wiesenberger Funds Update ranked the fund in the top 8% of 119 
small-company growth funds for 12 months and in the top 20% of 25 funds for 
10 years, also for periods ended January 31, 1994. 

Tried-and-true strategy During the period, we continued to pursue the fund's 
long-standing and successful strategy: to seek out relatively new small to 
midsized companies characterized by high growth rates, profitable market 
niches, strong balance sheets, and superior management. We have positioned 
the fund's holdings to benefit from an improving economy in the short term 
and from changing demographic trends over the longer term, particularly as 
the baby boomers proceed through their highest earning and saving years. 

Your management team builds the portfolio one stock at a time, selecting only 
those companies we believe meet our strict selection criteria. It is not 
entirely coincidental, however, that many companies we choose fall into 
industry groupings that, by their nature, define emerging growth. We were 
closely watching interactive media and the companies positioned along the 
information 

<PAGE>
 

superhighway, for example, long before these terms became buzz words. 

Portfolio changes In recent months, in fact, our focus on technology has 
included interactive media. We're also looking at software companies and 
companies involved in computer networking, like Wellfleet, Sybase, and 
PeopleSoft, all in the portfolio as of January 31, 1994. 

In the consumer area, we're looking at companies that, by offering their 
customers more value, strengthen their position within their markets. Among 
these are Buffets, Inc., in restaurants, Office Depot in office supplies, and 
Bed, Bath & Beyond in retailing. 

Not surprisingly, we have also been actively looking for ways the fund can 
benefit from the coming changes in the country's health care delivery system. 
A particular focus is on operators of managed care facilities like Coventry 
Corp. and Healthsource, which are likely to come into wider use, regardless 
of the outcome of the health care debate. 

Outlook The present slow but steady economic recovery is ideal for emerging 
growth stocks. It's the type of environment that tends to keep interest rates 
and inflation in check. It fosters earnings growth as sales pick up faster 
than overhead, and makes expansion affordable for the healthy, well-managed, 
and growing companies we seek for your fund's portfolio. 

Broadcasting         14.6%
Healthcare Services  13.5%
Computer Software    10.8%
Retail                9.2%
Restaurants           6.5%

That said, we should explain that stock price trends of emerging growth 
companies have historically run in relatively long cycles: typically, about 
seven years of rising prices, followed by about seven years of level or 
declining prices. The current cycle of rising prices has been in place for 
about three years. 

We expect both the favorable, slow-growth, low-inflation economic climate and 
the general uptrend in emerging growth stocks to remain in place for the 
foreseeable future. However, we would not be surprised to see a brief, mild 
downturn in the stock market at some point, given its exuberant rise in 
recent months. We would use any such correction to upgrade the quality of the 
portfolio by adding to current holdings or acquiring new ones at attractive 
prices. 

The views expressed throughout the report are exclusively those of Putnam 
Management. They are not meant as investment advice. Although the described 
holdings are viewed favorably as January 31, 1994, there is no guarantee the 
fund will continue to hold these securities in the future. 

<PAGE>
 

Portfolio of 
investments owned 
January 31, 1994 (Unaudited) 

Common Stocks (95.5%)(a) 

Number of Shares                                             Value 
Broadcasting (14.6%) 
  200,000     Century Communications Corp. Class A    $  2,125,000 
  153,300     Clear Channel Communications, Inc.(b)      6,112,838 
  291,525     Comcast Corp. Special Class A              9,255,919 
  320,850     Infinity Broadcasting Corp. 
              Class A (b)                               10,427,625 
  600,000     Liberty Media Corp. Class A(b)            15,600,000 
  118,500     QVC Network, Inc.(c)                       5,214,000 
  100,000     SFX Broadcasting, Inc. Class A(b)          1,225,000 
  181,600     TCA Cable TV, Inc.                         4,698,900 
  380,000     Westcott Communications, Inc.(b)           8,692,500 
  504,900     Westwood One, Inc.(b)                      4,291,650 
                                                        67,643,432 
Health Care Services (13.5%) 
   75,000     Careline, Inc.(b)                            918,750 
   48,100     Clinicom, Inc.                             1,130,350 
  180,000     Coventry Corp.(b)                          9,180,000 
  225,000     Health Management Assoc., Inc.(b)          7,284,375 
  104,700     Healthsource, Inc.(b)                      6,295,088 
  200,000     Homecare Management, Inc.(b)               3,250,000 
  130,000     Homedco Group, Inc.(b)                     4,647,500 
  155,000     Horizon Healthcare Corp.(b)                3,410,000 
  288,000     Lincare Holdings, Inc.(b)                  6,336,000 
   66,000     Medaphis Corp.(b)                          2,392,500 
  160,000     Oxford Health Plan(b)                     10,560,000 
   50,000     Physician Corp. of America(c)              1,475,000 
  170,000     Vencor Inc.(b)                             5,525,000 
                                                        62,404,563 
Computer Software (10.8%) 
   70,000     FTP Software, Inc.(b)                      1,960,000 
  139,800     Parametric Technology Corp.                4,665,825 
  174,800     PeopleSoft, Inc.(c)                        5,549,900 
    6,300     Powersoft Corp.(b)                           352,800 
  280,000     Sybase, Inc.(b)                           12,880,000 
  100,000     Synopsys, Inc.(b)                          4,512,500 
   54,000     Wall Data, Inc.(b)                         2,835,000 
  230,000     Wellfleet Communications, Inc.(b)         17,077,500 
                                                        49,833,525 
Retail (9.2%) 
   51,000     Autozone Inc.(b)                        $  2,875,125 
  300,000     Bed Bath & Beyond, Inc.(b)                 9,075,000 
  103,400     Gymboree Corp.(b)                          3,993,825 
  255,000     Heilig-Meyers Co.                          8,988,750 
  187,500     Office Depot, Inc.(b)                      6,820,313 
  100,000     Petsmart, Inc.(c)                          3,375,000 
  255,000     Stein Mart, Inc.(b)                        4,398,750 
   93,400     Sun Television & Appliances, Inc.          1,669,525 
  100,000     Today's Man, Inc.                          1,400,000 
                                                        42,596,288 
Restaurants (6.5%) 
  229,100     Apple South, Inc.                          5,040,200 
   15,200     Au Bon Pain Co., Inc.(b)                     383,800 
  168,100     Bertucci's Inc.                            3,025,800 
    4,000     Boston Chicken, Inc.(b)                      190,000 
  194,600     Buffets, Inc.(b)                           5,156,900 
  111,900     DF&R Restaurants, Inc.(b)                  3,105,225 
   66,000     Fresh Choice, Inc.(b)                      1,823,250 
  115,200     Landry's Seafood Restaurants, Inc. (b)     2,937,600 
  145,000     Outback Steakhouse, Inc.(b)                5,727,500 
   89,200     Papa Johns International, Inc.             2,575,650 
                                                        29,965,925 
Business Services (5.1%) 
   80,000     Danka Business Systems ADR(c)              3,300,000 
   85,700     Interim Svcs., Inc.                        2,153,213 
   85,000     Kelly Services, Inc. Class A               2,528,750 
  165,000     Olsten Corp.(The)                          5,156,250 
  104,675     Paychex, Inc.                              4,187,000 
   10,500     Pharmaceutical Marketing Services, 
              Inc.(c)                                      168,000 
  199,900     Robert Half International, Inc.(b)         6,296,850 
                                                        23,790,063 
Recreation (5.0%) 
  308,000     Boomtown, Inc.(b)                          5,621,000 
  155,300     Casino America, Inc.(b)                    4,270,750 
  350,000     Mirage Resorts, Inc.(b)                    8,706,250 
  177,400     Players International Inc.                 4,568,050 
                                                        23,166,050 

<PAGE>

Insurance (4.4%) 
   95,000     Berkley (W.R.) Corp.                    $  3,396,250 
  110,000     Gallagher (Arthur J.) & Co.                3,410,000 
  142,700     National Re Corp.                          4,138,300 
   70,000     SunAmerica, Inc.                           2,861,250 
   57,500     Transatlantic Holdings Inc.                3,061,875 
  100,000     Trenwick Group Inc.                        3,675,000 
                                                        20,542,675 
Computer Services (3.9%) 
  200,000     America Online, Inc.(b)                   12,750,000 
    7,000     Cambridge Tech Partners                      126,000 
  274,562     Fiserv Inc.(b)                             5,285,319 
                                                        18,161,319 
Telephone Services (3.3%) 
  185,000     Central Communications, Inc.               2,636,250 
   50,000     Century Telephone Enterprises, Inc.        1,362,500 
  100,000     Davel Communications Group, 
              Inc. (b)                                   1,550,000 
  130,000     MFS Communications Company, Inc.(b)        5,005,000 
  100,000     Telephone & Data Systems, Inc.             4,937,500 
                                                        15,491,250 
Consumer Services (3.3%) 
  135,000     CUC International, Inc.(b)                 4,320,000 
  125,000     Educational Alternatives                   4,500,000 
  145,000     Loewen Group, Inc.                         3,860,625 
  100,000     Stewart Enterprises, Inc. Class A          2,700,000 
                                                        15,380,625 
Pharmaceuticals and Biotechnology (3.1%) 
   97,500     Amylin Pharmaceuticals, Inc.(b)            1,401,563 
   87,400     Cellpro, Inc.(b)                           2,884,200 
  130,000     Cephalon, Inc.(b)                          2,372,500 
  120,000     Cor Therapeutics, Inc.(b)                  1,890,000 
  150,000     Immulogic Pharmaceutical Corp.(b)          1,987,500 
  170,000     Magainin Pharmaceuticals, Inc.             3,017,500 
   61,200     Penederm, Inc.(c)                            856,800 
                                                        14,410,063 
Medical Equipment and Supplies (2.8%) 
   50,400                                             $ 
              Ballard Medical Products                     762,300 
   86,900     Bioject Medical Technologies(b)              407,344 
   75,000     Haemonetics Corp.(b)                       1,743,750 
   99,000     Protocol Systems, Inc.                       915,750 
   92,500     Sofamor/Danek Group, Inc.(b)               3,283,750 
  156,300     Zoll Medical Corp.(b)                      5,626,800 
                                                        12,739,694 
Lodging (2.4%) 
  202,500     Hospitality Franchise Systems, 
              Inc. (b)                                  11,213,438 
Paging (1.6%) 
  111,106     A+ Communications, Inc.(b)                 1,555,400 
  204,750     Paging Network, Inc.(b)                    5,886,563 
                                                         7,441,963 
Consumer Non-Durables (1.4%) 
  119,900     Tommy Hilfiger(b)                          4,241,463 
   85,000     Authentic Fitness Corp.(b)                 2,348,125 
                                                         6,589,588 
Semiconductors (1.2%) 
  107,600     Maxim Integrated Products Inc.(b)          5,353,100 
Cellular Broadcasting (1.1%) 
    7,300     Cellular Communications, Inc. 
              Class A(b)                                   330,325 
   45,000     Centennial Cellular Corp. Class A            967,500 
  135,000     United States Cellular Corp.(b)            3,915,000 
                                                         5,212,825 
Business Equipment (1.0%) 
  135,000     Antec Corp.(b)                             3,510,000 
   73,000     Star Sight Telecast, Inc.(b)               1,113,250 
                                                         4,623,250 
Publishing (0.8%) 
  123,544     Marvel Entertainment Group, Inc.(b)        3,598,219 
Specialty Consumer Products (0.4%) 
   86,100     Valence Technology, Inc.(b)                1,700,475 

<PAGE>

Number of Shares                                             Value
Environmental Services (0.2%) 
   35,000     Molten Metal Technology, Inc.(b)        $    883,750 
              Total Common Stocks 
              (cost $294,888,159)                     $442,742,080 
Convertible Preferred Stocks (0.8%)(a) (cost $1,983,203) 
Number of Shares                                             Value 
   86,800     Cellular Communications, Inc. 
              $0.01, cv. pfd.                         $  3,927,700 

Warrants (--%)(a) (cost $   --   ) 
                                  Expiration 
Number of Warrants                      Date                 Value 
1,025         Windmere Corp.         1/19/98                  $636 

Short-Term Investments (3.3%)(a) (cost $15,465,362) 
Principal Amount                                             Value 
$15,464,000      Interest in $15,464,000 
                 repurchase agreement dated 
                 January 31, 1994 with Kidder 
                 Peabody & Co., Inc. due February 
                 1, 1994 with respect to various 
                 U.S. Treasury obligations-- 
                 maturity value of $15,465,362 for 
                 an effective yield of 3.17%          $ 15,465,362 
                 Total Investments 
                 (cost $312,336,724)(d)               $462,135,778 

Notes 
(a) Percentages indicated are based on total net assets of $463,521,106, 
which correspond to a net asset value per class A and class B shareholders of 
$11.73 and $11.67, respectively. 
(b) Non-income-producing security. 
(c) Securities whose value is determined or significantly influenced by 
trading on exchanges not in the United States or Canada. 
ADR after the name of a foreign holding stands for American Depository 
Receipt representing foreign securities on deposit with a domestic custodian 
bank. 
(d) The aggregate identified cost on a tax basis is $312,267,182, resulting 
in gross unrealized appreciation and depreciation of $156,053,563 and 
$6,184,967, respectively, or net unrealized appreciation of $149,868,596. 

<PAGE>

Statement of 
assets and liabilities 
January 31, 1994 (Unaudited) 

<TABLE>
<S>                  <S>                                                            <C>             <C>
Assets               Investments in securities, at value (identified cost $312,336,724) (Note 1)    $462,135,777 
                     Cash                                                                                    397 
                     Dividends, interest and other receivables                                            31,456 
                     Receivable for shares of the Fund sold                                            4,632,195 
                     Receivable for securities sold                                                   27,923,733 
                       Total assets                                                                  494,723,558 
Liabilities          Payable for securities purchased                               $29,738,459 
                     Payable for shares of the Fund repurchased                         824,425 
                     Payable for compensation of Manager (Note 2)                       271,002 
                     Payable for compensation of Trustees (Note                             324 
                     Payable for administrative services (Note 2)                         3,015 
                     Payable for distribution fees (Note 2)                             104,763 
                     Payable for investor servicing and custodian fees (Note 2)                          165,485 
                     Other accrued expenses                                              94,979 
                       Total liabilities                                                              31,202,452 
                     Net assets                                                                     $463,521,106 
Represented by       Paid-in capital (Note 4)                                                       $294,696,813 
                     Accumulated net realized gain on investment transactions                         21,152,819 
                     Accumulated net investment loss                                                  (2,127,579) 
                     Net unrealized appreciation of investments                                      149,799,053 
                     Total--Representing net assets applicable to capital shares outstanding        $463,521,106 
Computation of       Net asset value and redemption price of Class A shares 
net asset value         ($447,020,548 divided by 38,096,702 shares) 
and offering 
price                                                                                                     $11.73 
                     Offering price per Class A share (100/94.25 of $11.73)*                        $      12.45 
                     Net asset value and offering price of Class B shares 
                        ($16,500,558 divided by 1,414,408 shares)**                                 $      11.67 
</TABLE>
*On single retail sales of less than $50,000. On sales of $50,000 or more and 
on group sales the offering price is reduced. 
**Redemption price per share is equal to net asset value less any applicable 
contingent deferred sales charge. 

<PAGE>

Statement of 
operations 
Six months ended January 31, 1994 (Unaudited) 

<TABLE>
               <S>                                                               <C>            <C>
               Investment income:                                              
               Dividends (net of foreign tax of $1,258)                                         $   331,692 
               Interest                                                                              16,476 
                 Total investment income                                                            348,168 
               Expenses: 
               Compensation of Manager (Note 2)                                  $1,460,077 
               Investor servicing and custodian fees (Note 2)                       325,394 
               Compensation of Trustees (Note 2)                                      9,974 
               Reports to shareholders                                               43,594 
               Auditing                                                              10,052 
               Legal                                                                 12,161 
               Postage                                                               42,839 
               Registration fees                                                      1,952 
               Administrative services (Note 2)                                       4,017 
               Distribution fees--Class A (Note 2)                                  511,449 
               Distribution fees--Class B (Note 2)                                   28,373 
               Other                                                                 25,673 
                 Total expenses                                                                   2,475,555 
               Net investment loss                                                               (2,127,387) 
               Net realized gain on investments (Notes 1 and 3)                                  34,957,408 
               Net unrealized appreciation of investments during the 
                 period                                                                          45,316,632 
               Net gain on investments                                                           80,274,040 
               Net increase in net assets resulting from operations                             $78,146,653 

</TABLE>

<PAGE>

Statement of 
changes in net assets 

<TABLE>
<CAPTION>

                                                                     Six months              Year ended 
                                                               ended January 31                 July 31 
                                                                           1994                    1993
<S>                                                                <C>                     <C>
Increase in net assets 
Operations: 
Net investment loss                                                $ (2,127,387)           $ (2,815,418) 
Net realized gain on investments                                     34,957,408              28,164,696 
Net unrealized appreciation of investments                           45,316,632              64,246,684 
Net increase in net assets resulting from operations                 78,146,653              89,595,962 
Distributions to shareholders from net realized gain on 
  investments: 
 Class A                                                            (40,826,743)            (34,268,397) 
 Class B                                                               (867,413)                -- 
Increase from capital share transactions (Note 4)                    62,214,046              42,189,208 
Total increase in net assets                                         98,666,543              97,516,773 
Net assets 
Beginning of period                                                 364,854,563             267,337,790 
End of period (including accumulated net investment loss 
  of $2,127,579 and $8,612,015, respectively)                      $463,521,106            $364,854,563 
</TABLE>
*Unaudited. 

<PAGE>
 

Financial Highlights* 
(For a share outstanding throughout the period) 

<TABLE>
<CAPTION>
                         Six                                                                                   Eleven 
                      months                                                                                   months       Year 
                       ended                                                                                    ended      ended 
                     January                                                                                     July     August 
                          31                                Year ended July 31                                     31         31 
                        1994**    1993      1992      1991     1990      1989      1988  1987***       1986      1985       1984 
                                                                       Class A 
<S>                   <C>        <C>       <C>       <C>      <C>       <C>       <C>       <C>       <C>       <C>        <C>
Net Asset Value, 
  Beginning of 
  Period              $10.72     $9.05     $8.35     $8.20    $8.09     $6.40     $7.84     $6.56     $5.10     $4.17      $4.22 
Investment 
  Operations 
Net Investment 
  Gain (Loss)           (.03)     (.06)     (.04)     (.01)    (.03)     (.03)     (.04)(a)  (.02)(a)  (.02)     (.03)       .04(a) 
Net Realized and 
  Unrealized Gain 
  (Loss) on 
  Investments           2.24      2.87       .83       .46      .60      1.72      (.77)     1.87      1.57       .99        .10 
Total from 
  Investment 
  Operations            2.21      2.81       .79       .45      .57      1.69      (.81)     1.85      1.55       .96        .14 
Less Distributions 
  from: 
Net Investment 
  Income               --        --        --        --       --        --        --        --         --        (.03)       -- 
Net Realized Gain 
  on Investments       (1.20)    (1.14)     (.09)     (.30)     (.46)    --        (.63)     (.57)     (.09)     --         (.19) 
   
Total 
  Distributions        (1.20)    (1.14)     (.09)     (.30)     (.46)    --        (.63)     (.57)     (.09)     (.03)      (.19) 
   
Net Asset Value, 
  End of Period       $11.73    $10.72     $9.05     $8.35    $8.20     $8.09     $6.40     $7.84     $6.56     $5.10      $4.17 
Total Investment 
  Return at Net 
  Asset Value (%) 
  (b)                  42.30(c)   32.93     9.53      6.40     7.36     26.36     (9.77)    31.64     31.09     25.05(c)    3.05 
Net Assets, End of 
  Period (in 
  thousands)        $447,021   $364,400 $267,338  $234,055 $195,802  $180,775  $143,506  $157,094   $41,014   $20,248    $13,222 
Ratio of Expenses 
  to Average Net 
  Assets (%)            1.18(c)    1.26     1.39      1.48     1.50      1.63      1.59(a)    1.49(a)  1.46      1.69(c)    1.72(a) 
Ratio of Net 
  Investment 
  Income (Loss) to 
  Average Net 
  Assets (%)           (1.02)(c)   (.90)    (.59)     (.46)    (.47)     (.41)     (.74)(a)   (.62)(a) (.63)    (.94)(c) 1.16(a) 
Portfolio Turnover 
  (%)                  40.15(d)  108.20    66.75     54.06    42.66     73.58     76.91     92.76     91.92     55.17(d)  104.33 
</TABLE>
See page 13 for notes to financial highlights. 

<PAGE>

Financial Highlights* 
(For a share outstanding throughout the period) 

<TABLE>
<CAPTION>
                                                                                    For the period 
                                                                                     July 15, 1993 
                                                                      Six months     (commencement 
                                                                           ended    of operations) 
                                                                      January 31        to July 31 
                                                                          1994**              1993 
                                                                               Class B 
<S>                                                                      <C>              <C>
Net Asset Value, Beginning of Period                                     $ 10.70          $  10.80 
Investment Operations 
Net Investment Loss                                                         (.03)             (.01) 
Net Realized and Unrealized Gain (Loss) on Investments                      2.20              (.09) 
Total from Investment Operations                                            2.17              (.10) 
Less Distributions from: 
Net Investment Income                                                         --                -- 
Net Realized Gain on Investments                                           (1.20)               -- 
Total Distributions                                                        (1.20)               -- 
Net Asset Value, End of Period                                           $ 11.67          $  10.70 
Total Investment Return at Net Asset Value (%) (b)                         41.62(c)         (22.32)(c) 
Net Assets, End of Period (in thousands)                                 $16,501          $454,840 
Ratio of Expenses to Average Net Assets (%)                                 1.93(c)           1.93(c) 
Ratio of Net Investment Income (Loss) to Average Net Assets (%)            (1.77)(c)         (1.93)(c) 
Portfolio Turnover (%)                                                     40.15(d)         108.20 
</TABLE>

*Table has been restated to reflect a 4-for-1 share split, class A only,
 declared by the Fund to shareholders of record on October 27, 1989, payable
 on October 28, 1989. Financial highlights for periods ended through
 July 31, 1992 have been restated to conform with requirements issued 
 by the SEC in April 1993.
**Unaudited
***Per share investment income, expenses and net investment income
for the year ended July 31, 1987 have been determined on the basis of
the weighted average number of shares outstanding during the
year.
(a) Reflects an expense limitation applicable during the period. As
a result of such limitation, the net investment loss of the Fund for
the fiscal year ended July 31, 1988, and July 31, 1987 reflects per
share expense reductions of less than $0.01. Expenses for the fiscal
year ended August 31, 1984 reflects per share expense reductions of
$0.01.
(b) Total investment return assumes dividend reinvestment an does
not reflect the effect of sales charges.
(c) Annualized
(d) Not annualized Putnam OTC Emerging Growth Fund


<PAGE>

Notes to 
financial statements 
January 31, 1994 (Unaudited) 

Note 1 Significant accounting policies 

The Fund is registered under the Investment Company Act of 1940, as amended, 
as a diversified, open-end management investment company. The Fund seeks 
capital appreciation through investments in emerging growth stocks traded in 
the over-the-counter (OTC) market. 

The Fund offers both Class A and Class B shares. The Fund commenced its 
public offering of Class B shares on July 15, 1993. Class A shares are sold 
with a maximum front-end sales charge of 5.75%. Class B shares do not pay a 
front-end sales charge, but pay a higher ongoing distribution fee than Class 
A shares, and may be subject to a contingent deferred sales charge, if those 
shares are redeemed within six years of purchase. Expenses of the Fund are 
borne pro-rata by the holders of both classes of shares, except that each 
class bears expenses unique to that class including the distribution fees 
applicable to such class and votes as a class only with respect to its own 
distribution plan or other matters on which a class vote is required by law 
or determined by the Trustees. Shares of each class would receive their 
pro-rata share of the net assets of the Fund, if the Fund were liquidated. In 
addition, the Trustees declare separate dividends on each class of shares. 

The following is a summary of significant accounting policies consistently 
followed by the Fund in the preparation of its financial statements. The 
policies are in conformity with generally accepted accounting principles. 

A) Security valuation Investments for which market quotations are readily 
available are stated at market value, which is determined using the last 
reported sale price, or, if no sales are reported--as in the case of some 
securities traded over-the-counter--the last reported bid price, except that 
certain U.S. government obligations are stated at the mean between the last 
reported bid and asked prices. Short-term investments having remaining 
maturities of 60 days or less are stated at amortized cost which approximates 
market, and other investments are stated at fair value following procedures 
approved by the Trustees. (See Section E of Note 1 with respect to valuation 
of options.) 

B) Joint trading account Pursuant to an exemptive order issued by the 
Securities and Exchange Commission, the Fund may transfer uninvested cash 
balances into a joint trading account, along with the cash of other 
registered investment companies managed by Putnam Investment Management, 
Inc., the Fund's Manager, a wholly-owned subsidiary of Putnam Investments, 
Inc., and certain other accounts. These balances may be invested in one or 
more repurchase agreements and/or short-term money market instruments. 

C) Repurchase agreements The Fund, or any joint trading account, through its 
custodian, receives delivery of the underlying securities, the market value 
of which at the time of purchase is required to be in an amount at least 
equal to the resale price, including accrued interest. The Fund's Manager is 
responsible for determining that the value of these underlying securities is 
at all times at least equal to the resale price, including accrued interest. 

D) Security transactions and related investment income Security transactions 
are accounted for on the trade date (date the order to buy or sell is 
executed). Interest income is recorded on the accrual basis and dividend 
income is recorded on the ex-dividend date, except that certain dividends 
from foreign securities are recorded as soon as the Fund is informed of the 
ex-dividend date. 

E) Option accounting principles The premium paid by the Fund for the purchase 
of a call or put option is included in the Fund's Statement of Assets and 
Liabilities as an investment and subsequently marked-to-market to reflect the 
current market value of the option. If an option which the Fund has purchased 
expires on the stipulated expiration date, the Fund realizes a loss in the 
amount of the cost of the option. If the Fund enters into a closing sale 
transaction, the Fund realizes a gain or loss, depending on whether proceeds 
from the closing sale transaction are greater or less than the cost of the 
option. If the Fund exercises a call option, the cost of the securities 
acquired by exercising the call is increased by the premium paid to buy the 
call. If the Fund exercises a put option, it realizes a gain or loss from the 
sale of the underlying security and the proceeds from such sale are decreased 
by the premium originally paid. 

Stock index options Stock index options are similar to options on individual 
securities in that the purchaser of an index option acquires the right to 
buy, and the writer undertakes the obligation to sell, an index at a stated 
exercise price during the term of the option. Instead of giving the right to 
take or make actual delivery of securities, the holder of a stock index 
option has the right to 

<PAGE>
 

receive a cash "exercise settlement amount." This amount is equal to the 
amount by which the fixed exercise price of the option exceeds (in the case 
of a put) or is less than (in the case of a call) the closing value of the 
underlying index on the date of the exercise, multiplied by a fixed "index 
multiplier." The Fund writes options on stocks indices only to the extent 
that it holds in its portfolio underlying securities which, in the judgment 
of Putnam Management, correlate closely with the stock index. 

F) Federal taxes It is the policy of the Fund to distribute all of its income 
within the prescribed time and otherwise comply with the provisions of the 
Internal Revenue Code applicable to regulated investment companies. It is 
also the intention of the Fund to distribute an amount sufficient to avoid 
imposition of any excise tax under Section 4982 of the Internal Revenue Code 
of 1986. Therefore, no provision has been made for federal taxes on income, 
capital gains or unrealized appreciation of securities held, and excise tax 
on income and capital gains. 

G) Distributions to shareholders Distributions to shareholders are recorded 
by the Fund on the ex-dividend date. 

Note 2 Management fee, administrative services, and other transactions 

Compensation of Putnam Investment Management, Inc. (Putnam Management), the 
Fund's Manager, a wholly-owned subsidiary of Putnam Investments, Inc., for 
management and investment advisory services is paid monthly based on the 
average net assets of the Fund for the month at an annual rate of 0.70% of 
the first $500 million of average net assets, 0.60% of the next $500 million, 
0.55% of the next $500 million, and 0.50% of any amount over $1.5 billion, 
subject to reduction in any year to the extent that expenses (exclusive of 
brokerage commissions, taxes, interest, distribution-related expenses and 
extraordinary expenses) of the Fund exceed 2.5% of the first $30 million of 
average net assets, 2.0% of the next $70 million and 1.5% of any excess over 
$100 million, and by the amount of certain brokerage commissions and fees 
(less expenses) received by the affiliates of the Manager on the Fund's 
portfolio transactions. 

The Fund also reimburses the Manager for the compensation and related 
expenses of certain officers of the Fund and their staff who provide 
administrative services to the Fund. The aggregate amount of all such 
reimbursements is determined annually by the Trustees. For the six months 
ended January 31, 1994, the Fund incurred $4,017 for these services. 

Trustees of the Fund receive an annual Trustee's fee of $1,120 and an 
additional fee for each Trustees' meeting attended. Trustees who are not 
interested persons of the Manager and who serve on committees of the Trustees 
receive additional fees for attendance at certain committee meetings. 

Custodial functions for the Fund's assets are being provided by Putnam 
Fiduciary Trust Company (PFTC) a subsidiary of Putnam Investments, Inc. 
Investor servicing agent functions are provided by Putnam Investor Services, 
a division of PFTC. Fees paid for these investor servicing and custodial 
functions for the six months ended January 31, 1994, amounted to $325,394. 

Investor service and custodian fees reported in the Statement of operations 
for the six months ended January 31, 1994 have been reduced by credits 
allowed by PFTC. 

The Fund has adopted a distribution plan with respect to its Class A shares 
(the "Class A Plan") pursuant to Rule 12b-1 under the Investment Company Act 
of 1940. The purpose of the Class A Plan is to compensate Putnam Mutual Funds 
Corp., a wholly-owned subsidiary of Putnam Investments Inc., for services 
provided and expenses incurred by it in distributing class A shares. The 
Trustees have approved payment by the Fund to Putnam Mutual Funds Corp. at an 
annual rate of 0.25% of the average net assets attributable to class A 
shares. For the six months ended January 31, 1994, the Fund paid $511,449 in 
distribution fees for class A shares. 

During the six months ended January 31, 1994, Putnam Mutual Funds Corp., 
acting as an underwriter, received net commissions of $144,774 from the sale 
of Class A shares of the Fund. 

A deferred sales charge of up to 1.00% is assessed on certain redemptions of 
Class A shares repurchased as part of an investment of $1 million or more. 
For the six months ended January 31, 1994, Putnam Mutual Funds Corp., acting 
as an underwriter, received $12 on such redemptions. 

The Fund has adopted a distribution plan with respect to its Class B shares 
(the "Class B Plan") pursuant to Rule 12b-1 under the Investment Company Act 
of 1940. The purpose of the Class B Plan is to compensate Putnam Mutual Funds 
Corp. for services provided 

<PAGE>
 

and expenses incurred by it in distributing Class B shares. The Class B Plan 
provides for payments by the Fund to Putnam Mutual Funds Corp. at an annual 
rate of up to 1.00% of the Fund's average net assets attributable to Class B 
shares. For the six months ended January 31, 1994, the Fund paid Putnam 
Mutual Funds Corp. distribution fees of $28,373 for Class B shares. 
Putnam Mutual Funds Corp., acting as an underwriter, also receives the 
proceeds of the contingent deferred sales charges levied on Class B share 
redemptions within six years of purchase. The charge is based on declining 
rates, which begin at 5.0% of the net asset value of the redeemed shares. 
Putnam Mutual Funds Corp., received $4,320 in contingent deferred sales 
charges from such redemptions for the six months ended January 31, 1994. 

Note 3 Purchases and sales of securities 

During the six months ended January 31, 1994, purchases and sales of 
investment securities other than short-term investments aggregated 
$170,703,400 and $164,198,364 respectively. There were no purchases or sales 
of U.S. government obligations during the year. In determining the net gain 
or loss on securities sold, the cost of securities has been determined on the 
identified cost basis. 

<PAGE>

Note 4 Capital shares 

At January 31, 1994, there was an unlimited number of shares of beneficial 
interest authorized. Transactions in capital shares were as follows: 

<TABLE>
<CAPTION>
                                                                Six months ended                         Year ended 
                                                                      January 31                            July 31 
                                                               1994                              1993 
<S>                                                 <C>            <C>               <C>              <C>
Class A                                                  Shares           Amount          Shares             Amount 
Shares sold                                          15,133,205    $ 177,531,787      20,810,332      $ 202,860,662 
Shares issued in connection with reinvestment 
  of distributions                                    3,401,479       38,096,479       3,401,605         31,845,075 
                                                     18,534,684      215,628,266      24,211,937        234,705,737 
Shares repurchased                                  (14,442,463)    (169,409,516)    (19,732,401)      (192,968,623) 
Net increase                                          4,092,221    $  46,218,750       4,479,536      $  41,737,114 
</TABLE>

<TABLE>
<CAPTION>
                                                                                                      July 15, 1993 
                                                                                                      (commencement 
                                                                Six months ended                  of operations) to 
                                                                      January 31                            July 31 
                                                               1994                              1993 
<S>                                                   <C>            <C>                  <C>              <C>
Class B                                                  Shares           Amount          Shares             Amount 
Shares sold                                           1,455,726      $17,022,427          42,496           $452,094 
Shares issued in connection with reinvestment 
  of distributions                                       70,397          784,226            --                -- 
                                                      1,526,123       17,806,653          42,496            452,094 
Shares repurchased                                     (154,211)      (1,811,357)           --                -- 
Net increase                                          1,371,912      $15,995,296          42,496           $452,094 
</TABLE>


Note 5 Reclassification of Capital Account 

Effective August 1, 1993, Putnam OTC Emerging Growth Fund has adopted the 
provisions of Statement of Position 93-2 "Determination, Disclosure and 
Financial Statement Presentation of Income, Capital Gain and Return of 
Capital Distributions by Investment Companies (SOP)." The purpose of this SOP 
is to report the accumulated net investment income (loss) and accumulated net 
realized gain (loss) accounts in such manner as to approximate amounts 
available for future distributions (or to offset future realized capital 
gains) and to achieve uniformity in the presentation of distributions by 
investment companies. 

As a result of the SOP, the Fund has reclassified $8,612,015 to increase 
accumulated net investment loss and increased accumulated net realized gain 
by $1,361,537, with a decrease of $9,973,552 to additional paid-in capital. 
These adjustments represent the cumulative amounts necessary to report these 
balances through July 31, 1993, the close of the Fund's most recent fiscal 
year-end, for financial reporting and tax purposes. 

<PAGE>

Fund 
Performance 
Supplement 

Putnam OTC Emerging Growth Fund is a portfolio of small-to-medium 
capitalization common stocks traded in the over-the-counter market managed 
for capital appreciation. The NASDAQ Industrial Index is an unmanaged index 
of common stocks traded in the over-the-counter market. The Standard & Poor's 
500 Index is an unmanaged list of large-capitalization common stocks; it 
assumes reinvestment of all distributions. The indexes do not take into 
account brokerage commissions other costs. The fund's portfolio contains 
securities that do not match those in the indexes. Fund performance data do 
not take into account any adjustment for taxes that may have been payable. 
Morningstar Mutual Funds, Lipper Analytical Services, and CDA/Wiesenberger 
Funds Update are independent research firms that monitor mutual fund 
performance. Morningstar rates funds relative to those with similar 
objectives, based on risk-adjusted medium- and long-term performance, as 
applicable and adjusted for sales charges. Ratings are updated every two 
weeks. Lipper and CDA/Wiesenberger distribute mutual fund rankings monthly, 
classifying funds by investment objective and asset category. The rankings 
are based on total return performance; i.e., the change in net asset value 
adjusted for reinvestment of capital gains and income dividends. Lipper 
rankings cover a variety of performance periods, for example, year-to-date, 
1-year, 5-year, and 10-year performance. Lipper and CDA/Wiesenberger rankings 
do not account for any sales charges or fees. 
The fund performance supplement has been prepared by Putnam Management to 
provide additional information about the fund and the indexes used for 
performance comparisons. The information is not part of the portfolio of 
investments owned or the financial statements. 

<PAGE>
 

Your 
Trustees 
George Putnam 
Chairman 
Chairman and President, 
The Putnam Funds 
William F. Pounds 
Vice Chairman 
Professor of Management, 
Alfred P. Sloan 
School of Management, 
Massachusetts Institute of 
Technology 
Jameson Adkins Baxter 
President, 
Baxter Associates, Inc. 
Hans H. Estin 
Vice Chairman, 
North American 
Management Corporation 
John A. Hill 
Principal and 
Managing Director, 
First Reserve Corp. 
Elizabeth T. Kennan 
President, 
Mount Holyoke College 
Lawrence J. Lasser 
President and 
Chief Executive Officer, 
Putnam Investments, Inc. 
Robert E. Patterson 
Executive Vice President, 
Cabot Partners 
Limited Partnership 
Donald S. Perkins 
Director of various 
corporations 
George Putnam, III 
President, New Generation 
Research, Inc. 
A.J.C. Smith 
Chairman of the Board 
and Chief Executive Officer, 
Marsh & McLennan 
Companies, Inc. 
W. Nicholas Thorndike 
Director of various 
corporations 

<PAGE>
 

Putnam 
OTC Emerging 
Growth Fund 

Fund information 

Investment manager 
Putnam Investment 
Management 
One Post Office Square 
Boston, MA 02109 

Marketing services 
Putnam Mutual Funds Corp. 
One Post Office Square 
Boston, MA 02109 

Investor servicing agent 
Putnam Investor Services 
Mailing address: 
P.O. Box 41203 
Providence, RI 02940-1203 
1-800-225-1581 

Custodian 
Putnam Fiduciary 
Trust Company 

Legal counsel 
Ropes & Gray 

(DALBAR LOGO)

Putnam Investor 
Services has 
received the DALBAR award 
each year since 
the award's 1990 inception. 
In more than 10,000 tests 
of 38 shareholder 
service components, 
Putnam outperformed 
the industry standard 
in every category. 
19/BO1-11144 

Officers 
George Putnam 
President 

Charles E. Porter 
Executive Vice President 

Patricia C. Flaherty 
Senior Vice President 

Lawrence J. Lasser 
Vice President 

Gordon H. Silver 
Vice President 

Peter Carman 
Vice President 

Daniel L. Miller 
Vice President 
and Fund Manager 

William N. Shiebler 
Vice President 

John R. Verani 
Vice President 

John D. Hughes 
Vice President 
and Treasurer 

Paul O'Neil 
Vice President 

Beverly Marcus 
Clerk and 
Assistant Treasurer 

This report is for the information of shareholders of Putnam OTC Emerging 
Growth Fund. It may also be used as sales literature when preceded or 
accompanied by the current prospectus, which gives details of sales charges, 
investment objectives, and operating policies of the fund. 

PUTNAM INVESTMENTS
The Putnam Funds
One Post Office Square
Boston, Massachusetts 02109

Bulk Rate
U.S. Postage
Paid
Boston, MA
Permit No. 53749

<PAGE>


APPENDIX TO FORM N-30D FILINGS TO DESCRIBE DIFFERENCES BETWEEN PRINTED
AND EDGAR-FILED TEXTS:

(1)  Bold and italic typefaces are displayed in normal type.

(2)  Headers (e.g., the name of the fund) and footers (e.g., page
     numbers and "The accompanying notes are an integral part of these
     financial statements") are omitted.

(3)  Certain tabular and columnar headings and symbols are displayed 
     differently in this filing.

(4)  Bullet points and similar graphic signals are omitted.

(5)  Page numbering is omitted.

(6)  Dagger footnote symbol replaced with plus sign (+).








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