PUTNAM INVESTMENT FUNDS
N-30D, 1996-05-01
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Putnam
Real Estate
Opportunities
Fund
SEMIANNUAL REPORT
February 29, 1996

[GRAPHIC OMITTED: PUTNAM SCALES LOGO]
BOSTON * LONDON * TOKYO


Fund highlights


* "The average property-owning REIT recently yielded 1.4 percentage 
points more than a long-term Treasury bond -- a near-record spread. If 
you're buying REITs today, it's hard to go wrong."

     -- Kiplinger's Personal Finance Magazine, January 1996


* "During the period, commercial real estate produced a strong 
performance by historical standards, helped along by growing evidence of 
shrinking office vacancies, higher rents, and a burgeoning demand for 
suburban office space."

     -- Jeanne Mockard, Portfolio Manager


  CONTENTS
 4  Report from Putnam Management
 8  Fund performance summary
11  Portfolio holdings
15  Financial statements



From the Chairman


Dear Shareholder:

Putnam Real Estate Opportunities Fund began its first full fiscal year 
during one of the strongest stock market advances in recent memory. The 
extent of the market's rise and management's adept positioning of the 
portfolio are clearly reflected in your fund's results during the six 
months ended February 29, 1996. 

While we are pleased with the fund's performance, the stock market's 
increased volatility just after the period's close served as an abrupt 
reminder that even the strongest markets may take an occasional pause. 
Although more turbulence may lie ahead, Putnam Management nevertheless 
believes there is still some life in the market's broad advance. 

Fund Manager Jeanne Mockard, however, looks beyond the market's ups and 
downs as she pursues the fund's objective of seeking capital growth and 
current income through investing in stocks of companies principally 
engaged in the real estate industries. In the report that follows, 
Jeanne explains her strategy in more detail. 

Respectfully yours, 

/S/George Putnam

George Putnam

Chairman of the Trustees

April 17, 1996



Report from the Fund Manager
Jeanne Mockard


Over the six months ended February 29, 1996, the Dow Jones Industrial 
Average defied gravity, tearing through the 4000 and 5000 milestones and 
setting record after record. Investors' passion for technology stocks 
was the market's driving force for much of the period. But other 
factors, such as low inflation and strong overall corporate earnings, 
also contributed. In contrast to the blistering pace set by technology, 
stocks of real estate investment trusts (REITs) merely ambled along, 
largely untouched by the rally's extraordinary strength. 

Although REITs did not benefit from the buying frenzy that catapulted 
technology to all-time highs, they also did not suffer from technology's 
downturn in the fourth quarter of 1995. During the six months ended 
February 29, 1996, commercial real estate produced a strong performance 
by historical standards, helped along by growing evidence of shrinking 
office vacancies, higher rents, and a burgeoning demand for suburban 
office space. 

* FUND PERFORMANCE PROVES COMPETITIVE
Over the six months ended February 29, 1996, your fund delivered a total 
return of 11.35% at net asset value (4.94% at public offering price), 
comparing favorably with results of the National Association of Real 
Estate Investment Trusts (NAREIT) Index, which returned 8.93% for that 
period. This performance may appear disappointing to some investors, 
given the strength of the rally in the broader market and in the 
technology sector. It is important to keep in mind, however, that the 
ability of REITs to maintain a low correlation with the broad market can 
help stabilize your overall portfolio; indeed, this is the main reason 
many investors buy REITs. 

* POSITIONING STRATEGY KEEPS FUND ON COURSE
The strategy we put in place in January 1995 served the fund well 
throughout its abbreviated initial fiscal year, which ended on August 
31, 1995. We made no significant changes in the first six months of 
fiscal 1996. We maintained a heavy weighting in stocks of homebuilders. 
This proved a profitable position for the fund, since this sector was 
one of the strongest in the overall market. The fund's best-performing 
holdings during the period were Lennar Corp., up 47%, and Oakwood Homes, 
up 80%. Hotel REITs, which benefited from growing demand and rising room 
rates -- as we had expected -- were also particularly strong. Our top 
hotel REITs were Starwood, up almost 100%, and FelCor, up 50%, for the 
period ended February 29, 1996. 

We made minor adjustments to the portfolio in January 1996. Most of the 
changes involved adding or selling companies within each category. The 
only adjustment to overall portfolio weightings was in reducing exposure 
to homebuilders by about one half. Valuations of many of these stocks 
had approached our target levels, and we believed they were becoming 
vulnerable to a price correction. Our decision to pare stocks of 
homebuilders to 7.1% of the portfolio proved timely, as prices in that 
sector came down in February. 

Your fund is maintaining substantial positions in office and industrial 
REITs. Boston-based Beacon Properties is the fund's largest holding. 
Cali Realty, a successful office REIT in New Jersey, is another 
favorite. Duke Realty, an industrial REIT with properties in several 
Midwestern states, has also been a strong performer. While these stocks, 
along with others discussed in this report, were viewed favorably at the 
end of the period, all portfolio holdings are subject to review and 
adjustment in accordance with the fund's investment strategy and may 
well vary in the future. 

[HORIZONTAL BAR GRAPH SHOWING: TOP INDUSTRY SECTORS]
Residential             21.5%
Office and industrial   15.3%
Health-care facilities   7.7%
Home building            7.1%
Self-storage             6.2%
[Footnote reads:]
*Based on net assets as of 2/29/96. Holdings will vary over time.


* EXTENSIVE RESEARCH REMAINS A KEY INGREDIENT OF FUND STRATEGY
Successful investing within the REIT universe requires intensive bottom-
up research. For every purchase by Putnam, this effort translates into 
looking closely first at the individual company, then at the industries 
and trends that may affect the company, and finally at the overall 
economy and market as a whole. Individual company research is in-depth, 
yet flexible. The criteria considered to analyze a company that owns and 
manages office buildings, for example, are different from those applied 
to an owner of warehouses. The presence of unique features within each 
company, as well as from sector to sector, underscores the need for 
targeted research. 

Putnam has dedicated researchers devoted exclusively to REITs. They meet 
directly with the managements of companies, visit company sites, and 
look for several different indicators that can point to strong growth 
potential. For example, one important "buy" signal for us is high levels 
of inside ownership because such ownership points to the management's 
confidence in the company. 

Another positive factor is the presence of property and capital reserves 
sufficient to carry the company for at least two years. These suggest 
that the organization has the ability to grow by developing land it 
already owns without having to borrow at potentially unfavorable rates. 
Or, if bargains abound, it may mean that the company will have the 
resources to increase its holdings profitably. We also look at the 
dividend history and assess the potential for dividend growth. 

Another detail that can be important in making an investment decision is 
the structure of a company's lease agreements. If we believe inflation 
is on the rise, expiring leases can be a plus because rent increases 
would be likely to follow. But in a slow-growth environment, the 
opposite is often true: earnings could well suffer if leases must be 
renegotiated at lower rental rates. Retail REITs are especially 
vulnerable to pressure to renew expiring leases at lower rates because 
many struggling stores are desperate to keep costs down. Still, we 
believe some retail REITs represent exceptional values, and we may 
consider increasing holdings in that sector. 

* REITs CAN PROVIDE AN ANCHOR FOR YOUR PORTFOLIO
REITs can be a good hedge for all market conditions. For example, when 
interest rates are low and high-yield investments become scarce, REITs 
can often supply a welcome boost to an investor's current-income stream. 
In times of rising inflation and interest rates, when returns on other 
securities decline, REITs can actually boost earnings by raising rents. 
Since REITs are required to pass at least 95% of their income to 
investors, any such increase in earnings by portfolio holdings would 
benefit your fund's results. 

[GRAPHIC OMITTED WHICH READS:]
TOP 10 HOLDINGS (2/29/96)

Beacon Properties Corp. 
REIT managing properties in Boston

Duke Realty Investments, Inc. 
REIT managing properties in Midwestern states

Cali Realty Corp. 
REIT managing properties in northern and central New Jersey

Kaufman & Broad Home Corp. 
California-based single-family homebuilder

Public Storage, Inc.
REIT investing in miniwarehouses

Storage USA, Inc. 
REIT managing self-storage facilities

Nationwide Health Properties, Inc. 
REIT specializing in long-term health-care facilities

Centex Corp. 
Homebuilder and real estate developer

Deere & Co. 
Mobile power machinery manufacturer

Security Capital Pacific Trust
REIT managing properties in Southwestern states

[Footnote reads:]
These holdings represent 22.6% of the fund's net assets. Portfolio 
holdings will vary over time.


* POSITIVE OUTLOOK FOR THE FUTURE
REIT prices are currently at levels comparable with those during the 
late 1980s, when the real estate market faltered considerably. However, 
we consider the current low prices a function of the exceptional 
strength of the market in general, rather than a reflection of any 
fundamental weakness in real estate. In fact, we believe REIT stocks 
will begin to draw increasing investor attention as technology issues 
continue to come back down to earth and overall corporate earnings 
weaken. With a 6%-8% average yield over the past year, REIT stocks have 
a strong edge over both utility and bond yields and, in our opinion, 
currently offer patient investors an excellent buying opportunity. 

The views expressed here are exclusively those of Putnam Management. 
They are not meant as investment advice. Although the described holdings 
were viewed favorably as of 2/29/96, there is no guarantee the fund will 
continue to hold these securities in the future. The fund concentrates 
its investments in real estate industries and involves more risk than a 
fund that invests more broadly.


Performance Summary


Performance should always be considered in light of a fund's investment 
strategy. Putnam Real Estate Opportunities Fund is designed for 
investors seeking capital growth and current income by investing 
primarily in equity securities issued by companies principally engaged 
in the real estate industries.

This section provides, at a glance, information about your fund's 
performance. Total return shows how the value of the fund's shares 
changed over time, assuming you held the shares through the entire 
period and reinvested all distributions in the fund. 

TOTAL RETURN FOR PERIODS ENDED 2/29/96

                      NAV          POP
- ------------------------------------------------------------------------
6 months              11.35%        4.94%
- ------------------------------------------------------------------------
1 year                24.76        17.54
- ------------------------------------------------------------------------
Life of fund
(since 1/3/95)        24.32        17.15
Annual average        20.64        14.62
- ------------------------------------------------------------------------

COMPARATIVE INDEX RETURNS FOR PERIODS ENDED 2/29/96
                        Standard & Poor's     NAREIT
                           500 Index          Index
- ------------------------------------------------------------------------
6 months                     15.31%            8.93%
- ------------------------------------------------------------------------
1 year                       34.66            18.25
- ------------------------------------------------------------------------
Life of fund
(since 1/3/95)               43.53            18.53
Annual average               36.42            15.73
- ------------------------------------------------------------------------
Fund performance data does not take into account any adjustment for 
taxes payable on reinvested distributions. Performance data represent 
past results. Investment returns and net asset value will fluctuate so 
an investor's shares, when sold, may be worth more or less than their 
original cost. POP data assumes 5.75% maximum sales charge. Expense 
limitations were in effect during the period presented; without the 
limitations its total return would be lower. The short-term results of a 
relatively new fund are not necessarily indicative of its long-term 
prospects.

The indexes assume reinvestment of all distributions and interest 
payments and do not take in account brokerage fees or taxes. Securities 
in the fund do not match those in the indexes and performance of the 
fund will differ. It is not possible to invest directly in an index.


TOTAL RETURN FOR PERIODS ENDED 3/31/96
(most recent calendar quarter)
                                       NAV       POP
- ------------------------------------------------------------------------
6 months                               10.80%     4.45%
- ------------------------------------------------------------------------
1 year                                 26.13     18.88
- ------------------------------------------------------------------------
Life of fund
(since 1/3/95)                         26.57     19.28
Annual average                         20.93     15.28
- ------------------------------------------------------------------------
Fund performance data does not take into account any adjustment for 
taxes payable on reinvested distributions. Performance data represent 
past results. Investment returns and net asset value will fluctuate so 
an investor's shares, when sold, may be worth more or less than their 
original cost. POP data assumes 5.75% maximum sales charge. Expense 
limitations were in effect during the period presented; without the 
limitations its total return would be lower. The short-term results of a 
relatively new fund are not necessarily indicative of its long-term 
prospects.

PRICE AND DISTRIBUTION INFORMATION
Period ended 2/29/96
          
- ------------------------------------------------------------------------
Distributions 
- ------------------------------------------------------------------------
Number                          1
- ------------------------------------------------------------------------
Income                      $0.52
- ------------------------------------------------------------------------
Capital gains     
- ------------------------------------------------------------------------
Long-term                    --
- ------------------------------------------------------------------------
Short-term                  $0.07
- ------------------------------------------------------------------------
Total                        0.59
- ------------------------------------------------------------------------
Share value:             NAV       POP
- ------------------------------------------------------------------------
8/31/95                 $9.49     $10.07
- ------------------------------------------------------------------------
2/29/96                  9.94     10.55
- ------------------------------------------------------------------------


TERMS AND DEFINITIONS

Net asset value (NAV) is the value of all your fund's assets, minus any 
liabilities, divided by the number of outstanding shares, not including 
any initial 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. POP performance 
figures shown here assume the maximum 5.75% sales charge.


COMPETITIVE BENCHMARKS

Standard & Poor's 500 Index is an unmanaged list of common stocks that 
is frequently used as a general measure of stock market performance.

The National Association of Real Estate Investment Trusts (NAREIT) Index 
is based upon the last closing price of the month for all tax-qualified 
REITs listed on the major U.S. stock exchanges. The data are market 
weighted and the total return calculation is based upon the weightings 
at the beginning of period. Dividends are included in the month based 
upon their payment date.



<TABLE>
<CAPTION>

Portfolio of investments owned
February 29, 1996 (Unaudited)

COMMON STOCKS  (91.9%)*
NUMBER OF SHARES                                                                            VALUE

<S>              <C>  <C>                                                               <C>
Appliances  (0.6%)
- -------------------------------------------------------------------------------------------------
                 200  Whirlpool Corp.                                                     $11,125

Basic Industrial Products  (1.7%)
- -------------------------------------------------------------------------------------------------
                 900  Deere & Co.                                                          35,213

Consumer Non Durables  (0.7%)
- -------------------------------------------------------------------------------------------------
                 200  Eastman Kodak Co.                                                    14,300

Consumer Products  (1.5%)
- -------------------------------------------------------------------------------------------------
               1,000  Lowe's Cos., Inc.                                                    31,000

Diversified REITs  (2.3%)
- -------------------------------------------------------------------------------------------------
               1,000  Colonial Properties Trust (R)                                        24,000
               1,400  Washington Real Estate Investment Trust (R)                          23,275
                                                                                       ----------
                                                                                           47,275
Factory Outlets  (2.8%)
- -------------------------------------------------------------------------------------------------
               1,100  Chelsea GCA Realty, Inc. (R)                                         32,725
               1,152  HGI Realty, Inc. (R)                                                 24,480
                                                                                       ----------
                                                                                           57,205
Finance  (1.6%)
- -------------------------------------------------------------------------------------------------
                 400  Student Loan Marketing Assn.                                         33,050

Forest Products  (0.8%)
- -------------------------------------------------------------------------------------------------
                  400 Weyerhaeuser Co.                                                     16,950

Health Care Facilities  (7.7%)
- -------------------------------------------------------------------------------------------------
                 800  American Health Properties, Inc. (R)                                 18,600
                  80  American Health Properties, Inc. - Dep. Shs. (R)                      1,220
               1,100  LTC Properties Inc. (R)                                              18,150
                 600  Meditrust Corp. (R)                                                  19,950
                 900  National Health Investors, Inc. (R)                                  29,363
                 900  Nationwide Health Properties, Inc. (R)                               37,800
               1,100  Omega Healthcare Investors, Inc. (R)                                 31,900
                                                                                       ----------
                                                                                          156,983
Home Building  (7.1%)
- -------------------------------------------------------------------------------------------------
                 200  Castle & Cooke, Inc. +                                               $2,975
               1,300  Centex Corp.                                                         37,375
               3,000  Kaufman & Broad Home Corp.                                           46,125
                 800  Lennar Corp.                                                         19,200
                 600  Oakwood Homes Corp.                                                  26,775
                 500  Schuler Homes, Inc. +                                                 3,875
                 500  Webb (Delaware East) Corp.                                            9,000
                                                                                       ----------
                                                                                          145,325
Hotels  (4.4%)
- -------------------------------------------------------------------------------------------------
                 800  FelCor Suite Hotels, Inc. (R)                                        24,500
               1,100  Innkeepers USA Trust (R)                                             11,000
               1,000  RFS Hotel Investors, Inc. (R)                                        17,125
                 800  Starwood Lodging Trust (R)                                           27,500
                 700  Winston Hotels, Inc. (R)                                              9,188
                                                                                       ----------
                                                                                           89,313
Manufactured Homes  (5.0%)
- -------------------------------------------------------------------------------------------------
               1,300  Chateau Properties, Inc. (R)                                         31,688
               1,500  Manufactured Home Communities (R)                                    29,438
                 900  ROC Communities, Inc. (R)                                            21,825
                 700  Sun Communities, Inc.(R)                                             18,813
                                                                                       ----------
                                                                                          101,764
Office & Industrial  (15.3%)
- -------------------------------------------------------------------------------------------------
               2,758  Beacon Properties Corp. (R)                                          72,398
               2,500  Cali Realty Corp. (R)                                                56,563
                 600  CenterPoint Properties Corp. (R)                                     13,575
               1,800  Duke Realty Investments, Inc. (R)                                    57,150
               1,400  First Industrial Realty Trust, Inc. (R)                              32,725
               1,000  Highwoods Properties, Inc. (R)                                       30,000
                 700  Reckson Associates Realty Corp. (R)                                  20,475
                 400  Spieker Properties, Inc. (R)                                         10,350
                 700  Weeks Corp. (R)                                                      18,288
                                                                                       ----------
                                                                                          311,524
Railroads  (0.7%)
- -------------------------------------------------------------------------------------------------
                 200  Union Pacific Corp.                                                  13,200

Real Estate  (0.8%)
- -------------------------------------------------------------------------------------------------
                 800  Rouse Co.                                                            16,100

Regional Malls  (3.8%)
- -------------------------------------------------------------------------------------------------
               2,500  Debartolo Realty Corp. (R)                                           32,500
               1,000  Glimcher Realty Trust (R)                                            16,875
               1,000  Macerich Co. (R)                                                     19,375
                 400  Simon Property Group, Inc. (R)                                        9,350
                                                                                       ----------
                                                                                           78,100
Residential  (21.5%)
- -------------------------------------------------------------------------------------------------
               1,400  Avalon Properties, Inc.                                             $31,325
               1,400  Bay Apartment Community, Inc. (R)                                    32,900
               1,600  Columbus Realty Trust (R)                                            31,800
               1,000  Equity Residential Properties Trust (R)                              31,750
               1,400  Evans Withycombe Residential, Inc.                                   31,325
                 400  Gables Residential Trust (R)                                          9,950
               1,500  Home Properties of NY, Inc. (R)                                      28,500
               1,500  Merry Land & Investment Co., Inc. (R)                                34,125
               1,100  Mid-America Apartment Communities, Inc. (R)                          27,638
               1,000  Post Properties, Inc. (R)                                            32,500
               1,800  Prime Residential, Inc. (R)                                          32,175
               1,600  Security Capital Pacific Trust (R)                                   34,400
               1,200  Smith (Charles East) Residential Realty, Inc. (R)                    28,200
               2,400  South West Property Trust, Inc. (R)                                  34,200
                 800  Wellsford Residential Property Trust (R)                             18,100
                                                                                       ----------
                                                                                          438,888
Restaurants  (0.8%)
- -------------------------------------------------------------------------------------------------
               1,200  Commercial Net Lease Realty (R)                                      15,600

Retail  (1.0%)
- -------------------------------------------------------------------------------------------------
               3,000  Kmart Corp.                                                          21,000

Self Storage  (6.2%)
- -------------------------------------------------------------------------------------------------
               2,000  Public Storage, Inc. (R)                                             42,750
                 900  Shurgard Storage Centers, Inc. Class A (R)                           24,075
                 800  Storage Trust Realty (R)                                             17,800
               1,300  Storage USA, Inc. (R)                                                41,275
                                                                                       ----------
                                                                                          125,900
Shopping Centers  (5.6%)
- -------------------------------------------------------------------------------------------------
               1,400  Bradley Real Estate Trust, Inc. (R)                                  19,075
                 900  Excel Realty Trust, Inc. (R)                                         17,210
               1,200  Kimco Realty Corp. R                                                 32,700
               1,700  Malan Realty Investments, Inc. (R)                                   22,100
                 600  Weingarten Realty Investors, Inc. (R)                                22,500
                                                                                       ----------
                                                                                          113,585
                                                                                       ----------
                      Total Common Stocks   (cost $1,665,382)                          $1,873,400

CONVERTIBLE BONDS AND NOTES  (2.5%)*
PRINCIPAL AMOUNT                                                                            VALUE
- -------------------------------------------------------------------------------------------------
             $20,000  Liberty Property Trust cv.sub.deb., 8s, 2001 (R)                    $21,600
              30,000  Camden Property Trust cv.sub.deb., 7,33s, 2001 (R)                  $29,810
                                                                                          -------
                      Total Convertible Bonds and Notes (cost $46,300)                    $51,410

SHORT-TERM INVESTMENTS  (6.2%)* (cost $127,019)
PRINCIPAL AMOUNT                                                                            VALUE
- -------------------------------------------------------------------------------------------------
            $127,000  Interest in $1,108,321,000 repurchase agreeement
                      dated February 29, 1996 with Morgan (J.P.) & Co., Inc.
                      duke March 1, 1996 with respect to various U.S. Treasury
                      obligations - maturity value of $127,019 for an
                      effective yield of 5.42%                                           $127,019
- -------------------------------------------------------------------------------------------------
                      Total Investments (cost $1,838,701)***                           $2,051,829
- -------------------------------------------------------------------------------------------------
*   Percentages indicated are based on net assets of $2,038,618.
+   Non-income-producing security.
*** The aggregate identified cost on a tax cost basis is $1,838,702 resulting in gross unrealized 
    appreciation
    and depreciation of $251,314 and 38,187, respectively, or net unrealized appreciation of $213,127.
(R) Real Estate Investment Trust, (REIT).

The accompanying notes are an integral part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Statement of assets and liabilities
February 29,1996 (Unaudited)

Assets
- ----------------------------------------------------------------------------
<S>                                                             <C>
Investments in securities, at value
(identified cost $ 1,838,701)  (Note 1)                           $2,051,829
- ----------------------------------------------------------------------------
Cash                                                                     681
- ----------------------------------------------------------------------------
Dividends and interest receivable                                      3,901
- ----------------------------------------------------------------------------
Receivable from Manager (Note 3)                                       2,646
- ----------------------------------------------------------------------------
Unamortized organization expenses (Note 1)                             6,336
- ----------------------------------------------------------------------------
Total assets                                                       2,065,393

Liabilities
- ----------------------------------------------------------------------------
Payable for compensation of Trustees (Note 3)                             53
- ----------------------------------------------------------------------------
Payable for administrative services (Note 3)                               7
- ----------------------------------------------------------------------------
Payable for investor servicing and custodian fees (Note 3)             2,078
- ----------------------------------------------------------------------------
Payable for organization expenses  (Note 1)                            6,425
- ----------------------------------------------------------------------------
Other accrued expenses                                                18,212
- ----------------------------------------------------------------------------
Total liabilities                                                     26,775
- ----------------------------------------------------------------------------
Net assets                                                        $2,038,618

Represented by
- ----------------------------------------------------------------------------
Paid-in-capital (Notes 2 and 5)                                   $1,756,097
- ----------------------------------------------------------------------------
Undistributed net investment income                                    8,961
- ----------------------------------------------------------------------------
Accumulated net realized gain on investments                          60,432
- ----------------------------------------------------------------------------
Net unrealized appreciation of investments                           213,128
- ----------------------------------------------------------------------------
Total -- Representing net assets applicable to
capital shares outstanding                                        $2,038,618

Computation of net asset value and offering price
- ----------------------------------------------------------------------------
Net asset value and redemption price per share
($2,038,618 divided by 205,066 shares)                                 $9.94
- ----------------------------------------------------------------------------
Offering price per share (100/94.25 of $9.94)*                        $10.55
- ----------------------------------------------------------------------------
* 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.

The accompanying notes are an integral part of these financial statements.
</TABLE>

<TABLE>
<CAPTION>

Statement of operations
Six months ended February 29, 1996 (Unaudited)

Investment Income:
- ----------------------------------------------------------------------------
<S>                                                                <C>
Dividends                                                            $55,841
- ----------------------------------------------------------------------------
Interest                                                               1,899
- ----------------------------------------------------------------------------
Total investment income                                               57,740

Expenses:
- ----------------------------------------------------------------------------
Compensation of Manager (Note 3)                                       6,659
- ----------------------------------------------------------------------------
Investor servicing and custodian fees (Note 3)                         5,785
- ----------------------------------------------------------------------------
Compensation of Trustees (Note 3)                                        783
- ----------------------------------------------------------------------------
Administrative services (Note 3)                                          20
- ----------------------------------------------------------------------------
Auditing                                                               7,154
- ----------------------------------------------------------------------------
Legal                                                                    731
- ----------------------------------------------------------------------------
Other                                                                     12
- ----------------------------------------------------------------------------
Fees waived by Manager (Note 3)                                      (12,227)
- ----------------------------------------------------------------------------
Total expenses                                                         8,917
- ----------------------------------------------------------------------------
Expense reduction (Note 3)                                            (1,524)
- ----------------------------------------------------------------------------
Net expenses                                                           7,393
- ----------------------------------------------------------------------------
Net investment income                                                 50,347
- ----------------------------------------------------------------------------
Net realized gain on investments (Notes 1 and 4)                      75,560
- ----------------------------------------------------------------------------
Net unrealized appreciation of investments during the perio           81,222
- ----------------------------------------------------------------------------
Net gain on investments                                              156,782
- ----------------------------------------------------------------------------
Net increase in net assets resulting from operations                $207,129
- ----------------------------------------------------------------------------

The accompanying notes are an integral part of these financial statements.

</TABLE>


<TABLE>
<CAPTION>

Statement of changes in net assets

                                                                               For the period
                                                                              January 3, 1995
                                                                             (commencement of
                                                            Six months ended   operations) to
                                                           February 29, 1996   August 31 1995
- ---------------------------------------------------------------------------------------------
<S>                                                                 <C>               <C>
Increase in net assets
- ---------------------------------------------------------------------------------------------
Operations:
- ---------------------------------------------------------------------------------------------
Net investment income                                                $50,347          $57,930
- ---------------------------------------------------------------------------------------------
Net realized gain (loss) on investments                               75,560           (1,677)
- ---------------------------------------------------------------------------------------------
Net unrealized appreciation of investments                            81,222          131,906
- ---------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                 207,129          188,159
- ---------------------------------------------------------------------------------------------
Distributions to shareholders:
- ---------------------------------------------------------------------------------------------
     From net investment income                                      (99,919)              --
- ---------------------------------------------------------------------------------------------
     From net realized gain on investments                           (13,451)              --
- ---------------------------------------------------------------------------------------------
Increase from capital share transactions (Note 5)                    115,663        1,621,037
- ---------------------------------------------------------------------------------------------
Total increase in net assets                                         209,422        1,809,196
- ---------------------------------------------------------------------------------------------
Net assets
- ---------------------------------------------------------------------------------------------
Beginning of period                                                1,829,196           20,000
- ---------------------------------------------------------------------------------------------
End of period (including undistributed net
     investment income of $8,961 and
     $58,533, respectively)                                       $2,038,618       $1,829,196
- ---------------------------------------------------------------------------------------------
*Unaudited

The accompanying notes are an integral part of these financial statements.

</TABLE>



<TABLE>
<CAPTION>

Financial highlights
(For a share outstanding throughout the period)

                                                               For the period
                                                       Six    January 3, 1995
                                                    months      (commencement
                                                     ended     of operations)
                                               February 29       to August 31
                                                      1996 *             1995
- -----------------------------------------------------------------------------
<S>                                                 <C>               <C>
Net asset value, beginning of period                 $9.49              $8.50
- -----------------------------------------------------------------------------
Investment operations
- -----------------------------------------------------------------------------
Net investment income                                  .25(d)             .30(d)
- -----------------------------------------------------------------------------
Net realized and unrealized
gain on investments                                    .79                .69
- -----------------------------------------------------------------------------
Total from investment operations                      1.04                .99
- -----------------------------------------------------------------------------
Less distributions:
- -----------------------------------------------------------------------------
From net investment income                            (.52)                --
- -----------------------------------------------------------------------------
From net realized gain on investments                 (.07)                --
- -----------------------------------------------------------------------------
Total distributions                                   (.59)                --
- -----------------------------------------------------------------------------
Net asset value, end of period                        9.94               9.49
- -----------------------------------------------------------------------------
Total investment return at
net asset value  (%) (a)                             11.35(c)           11.65(c)
- -----------------------------------------------------------------------------
Net assets, end of period  (in thousands)            2,039              1,829
- -----------------------------------------------------------------------------
Ratio of expenses to average
net assets (%) (b)                                     .47(d)(c)          .48(d)(c)
- -----------------------------------------------------------------------------
Ratio of net investment income to   
average net assets (%)                                2.63(d)(c)         3.52(d)(c)
- -----------------------------------------------------------------------------
Portfolio turnover (%)                               14.50(c)            5.35(c)
- -----------------------------------------------------------------------------
 * Unaudited
 (a) Total investment return assumes dividend reinvestment and does not reflect 
     the effect of sales charges.
 (b) The ratio of expenses to average net assets for the period ended February 
     29, 1996 includes amounts paid through expense offset arrangements. Prior 
     period ratios exclude these amounts (Note 3).
 (c) Not annualized.
 (d) Reflects an expense limitation in effect during the period (Note 3). As a 
     result of such limitation, expenses for the fund for the period ended August 
     31, 1995 and February 29, 1996 reflect a reduction of $0.21 and $0.06 per 
     share, respectively.

</TABLE>



Notes to financial statements
February 29, 1996 (Unaudited)


Note 1
Significant accounting policies

The fund is one in a series of Putnam Investment Funds (the "Trust") 
which is registered under the Investment Company Act of 1940, as 
amended, as a diversified, open-end management investment company. The 
objective of the fund is to seek capital growth and current income by 
investing primarily in equity securities issued by companies principally 
engaged in the real estate industry. 

The following is a summary of significant accounting policies 
consistently followed by the fund in the preparation of its financial 
statements. The preparation of financial statements is in conformity 
with generally accepted accounting principles and requires management to 
make estimates and assumptions that affect the reported amounts of 
assets and liabilities. Actual results could differ from those 
estimates.

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. Short-term investments having remaining maturities of 60 days or 
less are stated at amortized cost, which approximates market value, and 
other investments are stated at fair market value following procedures 
approved by the Trustees.

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. ("Putnam Management"), 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 102% of the resale price, including accrued 
interest. Putnam Management is responsible for determining that the 
value of these underlying securities is at all times at least equal to 
102% of 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.

E) Federal income taxes It is the policy of the fund to distribute all 
of its taxable 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 on securities held and excise tax on income and capital 
gains. At August 31, 1995, the Fund had a capital loss carryover of 
approximately $1,700 available to offset future net capital gain, if 
any, which will expire on August 31, 2003.

F) Distributions to shareholders Distributions to shareholders from net 
investment income are recorded by the fund on the ex-dividend date. 
Capital gain distributions, if any, are recorded on the ex-dividend date 
and paid annually. The amount and character of income and gains to be 
distributed are determined in accordance with income tax regulations 
which may differ from generally accepted accounting principles. 

G) Expenses of the Trust Expenses directly charged or attributable to 
the fund will be paid from the assets of the fund. Generally, expenses 
of the Trust will be allocated among and charged to the assets of each 
fund on a basis that the Trustees deem fair and equitable, which may be 
based on the relative assets of each fund or the nature of the services 
performed and relative applicability to each fund.

H) Unamortized organization expenses Expenses incurred by the fund in 
connection with its organization,  registration with the Securities and 
Exchange Commission and with various states, and the initial public 
offering of its shares aggregated $6,425. These expenses are being 
amortized based upon projected net asset levels over a five-year period. 
The fund will reimburse Putnam Management for the payment of these 
expenses.


Note 2
Initial capitalization and offering price of shares

The Trust was established as a Massachusetts business trust under the 
laws of Massachusetts on October 31, 1994.

During the period October 31, 1994 to January 3, 1995, the fund had no 
operations other than those related to organizational matters, including 
the initial capital contribution of $20,000 and the issuance of 2,353 
shares to Putnam Mutual Funds Corp., a wholly-owned subsidiary of Putnam 
Investments, Inc. on January 3, 1995.

At February 29, 1996 Putnam Management owned 187,606 shares of the fund 
(91.49% of shares outstanding), valued at $1,864,804.


Note 3 
Management fee, administrative services, and other transactions 

Compensation of Putnam Management for management and investment advisory 
services is paid quarterly based on the average net assets of the fund 
for the quarter. Such fee is based on the following annual rates: 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, 0.50% of the next $5 billion, 
0.475% of the next $5 billion, 0.455% of the next $5 billion, 0.44% of 
the next $5 billion, and 0.43%, thereafter. 

Through May 31, 1996, the fund's manager has agreed to limit the fund's 
expenses to the extent that expenses (exclusive of interest, taxes, 
deferred organizational, extraordinary expenses and credits from Putnam 
Fiduciary Trust Company ("PFTC") a wholly- owned subsidiary of Putnam 
Investments Inc., if any) exceed an annual rate of 1.00% of the fund's 
average net assets.

The fund also reimburses Putnam Management 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. 
Trustees of the fund receive an annual Trustee's fee of $100 and an 
additional fee for each Trustees' meeting attended. Trustees who are not 
interested persons of Putnam Management and who serve on committees of 
the Trustees receive additional fees for attendance at certain committee 
meetings.

The fund adopted a Trustee Fee Deferral Plan (the "Plan") which allows 
the Trustees to defer the receipt of all or a portion of Trustees Fees 
payable on or after July 1, 1995. The deferred fees remain in the fund 
and are invested in the fund or in other Putnam funds until distribution 
in accordance with the Plan.

Custodial functions for the fund's assets are provided by PFTC, a 
wholly-owned subsidiary of Putnam Investments, Inc. Investor servicing 
agent functions are provided by Putnam Investor Services, a division of 
PFTC. 

For the six months ended February 29, 1996, fund expenses were reduced 
by $1,524 under expense offset arrangements with PFTC. Investor 
servicing and custodian fees reported in the Statement of operations 
exclude these credits. The fund could have invested the assets utilized 
in connection with the expense offset arrangements in an income 
producing asset if it had not entered into such arrangements. 

The fund has adopted a distribution plan with pursuant to Rule 12b-1 
under the Investment Company Act of 1940, although the fund is not 
currently making any payments pursuant to this plan. The purpose of the 
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 shares of the fund. The Trustees 
have approved payment by the fund to Putnam Mutual Funds Corp. at an 
annual rate of up to 0.35% of the fund's average net assets.

During the six months ended February 29, 1996, Putnam Mutual Funds 
Corp., acting as the underwriter, received no commissions from the sale 
of shares of the fund.


Note 4
Purchases and sales of securities

During the six months ended February 29, 1996, purchases of investment 
securities other than short-term investments, and U.S. government 
obligations, aggregated $269,417 and $275,469 respectively. There were 
no purchases and sales of U.S. government obligations. In determining 
the net gain or loss on securities sold, the cost of securities has been 
determined on the identified cost basis.


Note 5
Capital shares 

At February 29, 1996, there was an unlimited number of shares of 
beneficial interest authorized. Transactions in capital shares were as 
follows:

                         Six months ended 
                         February 29, 1996
- ----------------------------------------------------
                        Shares       Amount
- ----------------------------------------------------
Shares sold                930       $8,960
- ----------------------------------------------------
Shares issued in 
connection with 
reinvestment of 
distributions           12,124      113,369
- ----------------------------------------------------
                        13,054      122,329

Shares 
repurchased               (690)      (6,666)
- ----------------------------------------------------
Net increase            12,364     $115,663
- ----------------------------------------------------

                          For the period
                         January 3, 1995
                        (commencement of
                          operations) to
                         August 31, 1995
- ----------------------------------------------------
Shares sold            192,412   $1,639,850
- ----------------------------------------------------
Shares 
repurchased             (2,063)     (18,813)
- ----------------------------------------------------
Net increase           190,349   $1,621,037
- ----------------------------------------------------



Fund information


INVESTMENT MANAGER
Putnam Investment 
Management, Inc.
One Post Office Square
Boston, MA 02109

MARKETING SERVICES
Putnam Mutual Funds Corp. 
One Post Office Square
Boston, MA 02109

CUSTODIAN
Putnam Fiduciary Trust Company

LEGAL COUNSEL
Ropes & Gray

TRUSTEES
George Putnam, Chairman
William F. Pounds, Vice Chairman
Jameson Adkins Baxter
Hans H. Estin
John A. Hill
Elizabeth T. Kennan
Lawrence J. Lasser
Robert E. Patterson
Donald S. Perkins
George Putnam, III
Eli Shapiro
A.J.C. Smith
W. Nicholas Thorndike

OFFICERS
George Putnam
President 

Charles E. Porter
Executive Vice President

Patricia C. Flaherty
Senior Vice President

John D. Hughes
Senior Vice President and Treasurer

Lawrence J. Lasser
Vice President 

Gordon H. Silver
Vice President 

Peter Carman
Vice President

Brett C. Browchuk
Vice President

Thomas V. Reilly
Vice President

Jeanne L. Mockard
Vice President and Fund Manager

William N. Shiebler
Vice President 

John R. Verani
Vice President 

Paul M. O'Neil
Vice President 

Beverly Marcus
Clerk and Assistant Treasurer 

This report is for the information of shareholders of Putnam Real Estate 
Opportunities 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, and the most recent copy of Putnam's Quarterly Performance 
Summary. For more information, or to request a prospectus, call toll 
free: 1-800-225-1581.

Shares of mutual funds are not deposits or obligations of, or guaranteed 
or endorsed by, any financial institution, are not insured by the 
Federal Deposit Insurance Corporation (FDIC), the Federal Reserve Board 
or any other agency, and involve risk, including the possible loss of 
principal amount invested.


24060-403   4/96



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