PUTNAM INVESTMENT FUNDS
N-30D, 1996-06-04
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Putnam
Balanced
Fund

SEMIANNUAL REPORT
March 31, 1996

[LOGO: BOSTON * LONDON * TOKYO]



From the Chairman

Dear Shareholder:

During the six months ended March 31, 1996, strong stock and bond 
markets and continued economic growth provided a hospitable investment 
environment for strong perform-ance from Putnam Balanced Fund.

At the start of the fund's second fiscal year, Fund Managers David 
Santos and Kenneth Taubes initiated some strategic shifts that have 
proved beneficial. Dave, who manages the fund's equity portion, 
gradually increased the portfolio's exposure to medium-sized companies 
and added growth companies in industries that tend to do well in the 
later stages of recovery. On the fixed-income side, Ken increased U.S. 
corporate bond holdings and, in selecting foreign bonds, sought 
outperformance from international securities in comparison with the U.S. 
market. 

These strategies along with careful monitoring of economic and corporate 
developments in regard to risk have helped support the fund's net asset 
value under current market conditions. Given the degree of strength in 
the markets, Putnam Balanced Fund is a vehicle that, because of its 
fixed-income component, is likely to remain an attractive investment 
going forward. 

In accordance with our new policy for incubated fund reports, the 
semiannual report that follows simply provides portfolio holdings and 
financial statements. A detailed report from the fund managers will be 
forthcoming with the annual report. 

Respectfully yours, 

/S/George Putnam
George Putnam

Chairman of the Trustees

May 15, 1996



<TABLE>
<CAPTION>

Portfolio of investments owned
March 31, 1996 (Unaudited)
- --------------------------------------------------------------------------------------------------------------
COMMON STOCKS  (62.7%) *
NUMBER OF SHARES                                                                                         VALUE

<S>       <C>        <C>                                                                           <C>
Aerospace and Defense  (2.3%)
- --------------------------------------------------------------------------------------------------------------
                300  Boeing Co.                                                                        $25,988
                200  Lockheed Martin Corp.                                                              15,175
                100  Textron, Inc.                                                                       8,000
                                                                                                    ----------
                                                                                                        49,163
Apparel  (0.2%)
- --------------------------------------------------------------------------------------------------------------
                100  Gucci Group NV ADR (Netherlands)                                                    4,800

Automotive  (0.6%)
- --------------------------------------------------------------------------------------------------------------
                200  General Motors Corp. Class H                                                       12,650

Banks  (1.8%)
- --------------------------------------------------------------------------------------------------------------
                300  Citicorp                                                                           24,000
                200  Chemical Bank Corp.                                                                14,100
                                                                                                    ----------
                                                                                                        38,100
Basic Industrial Products  (1.8%)
- --------------------------------------------------------------------------------------------------------------
                400  Case Corp.                                                                         20,350
                400  Sundstrand Corp.                                                                   16,300
                                                                                                    ----------
                                                                                                        36,650

Broadcasting  (0.4%)                                                                                    
- --------------------------------------------------------------------------------------------------------------
                350  Tele-Comm Liberty Media Group, Inc. Class A +                                       9,231


Building and Construction  (0.7%)
- --------------------------------------------------------------------------------------------------------------
                200  Fluor Corp.                                                                        13,650

Business Equipment and Services  (4.0%)
- --------------------------------------------------------------------------------------------------------------
                200  3Com Corp. +                                                                        7,975
                300  Cisco Systems, Inc. +                                                              13,913
                200  First Data Corp.                                                                   14,100
                300  General Motors Corp. Class E                                                       17,100
                100  HBO & Co.                                                                           9,425
                100  Hewlett-Packard Co.                                                                 9,400
                100  U.S. Robotics Corp.                                                                12,925
                                                                                                    ----------
                                                                                                        84,838

Chemicals  (2.7%)
- --------------------------------------------------------------------------------------------------------------
                300  du Pont (E.I.) de Nemours & Co.                                                   $24,900
                100  Monsanto Co.                                                                       15,350
                400  Praxair, Inc.                                                                      15,950
                                                                                                    ----------
                                                                                                        56,200

Computer Services and Software  (5.6%)                                                                  
- --------------------------------------------------------------------------------------------------------------
                200  Cabletron Systems, Inc. +                                                          13,250
                300  Computer Associates Intl., Inc.                                                    21,488
                100  IBM Corp.                                                                          11,113
                400  Informix Corp. +                                                                   10,550
                300  Microsoft Corp. +                                                                  30,938
                300  Oracle Systems Corp. +                                                             14,138
                400  Parametric Technology Corp. +                                                      15,650
                                                                                                    ----------
                                                                                                       117,127

Consumer Non Durables  (3.6%)                                                                          
- --------------------------------------------------------------------------------------------------------------
                212  Kimberly-Clark Corp.                                                               15,794
                200  Nike, Inc.                                                                         16,250
                300  Philip Morris Cos., Inc.                                                           26,325
                200  Procter & Gamble Co.                                                               16,950
                                                                                                    ----------
                                                                                                        75,319

Consumer Services  (2.4%)                                                                               
- --------------------------------------------------------------------------------------------------------------
                200  Gannett Co., Inc.                                                                  13,450
                200  Marriott International, Inc.                                                        9,500
                300  McDonald's Corp.                                                                   14,400
                300  Mirage Resorts, Inc. +                                                             13,163
                                                                                                    ----------
                                                                                                        50,513

Electronics and Electrical Equipment  (1.4%)                                                            
- --------------------------------------------------------------------------------------------------------------
                400  Honeywell, Inc.                                                                    22,100
                200  Linear Technology Corp.                                                             8,350
                                                                                                    ----------
                                                                                                        30,450

Entertainment  (0.9%)                                                                                   
- --------------------------------------------------------------------------------------------------------------
                304  Disney (Walt) Productions, Inc.                                                    19,418

Food and Beverages  (3.0%)
- --------------------------------------------------------------------------------------------------------------
                200  Campbell Soup Co.                                                                  12,175
                200  Hershey Foods Corp.                                                                14,900
                300  Nabisco Holdings Corp. Class A                                                      9,825
                400  PepsiCo, Inc.                                                                      25,300
                                                                                                    ----------
                                                                                                        62,200
Health Care  (1.6%)
- --------------------------------------------------------------------------------------------------------------
                200  Amgen, Inc. +                                                                      11,625
                300  Boston Scientific Corp. +                                                          13,800
                100  Oxford Health Plans Inc. +                                                          8,775
                                                                                                    ----------
                                                                                                        34,200
Insurance and Finance  (7.8%)
- --------------------------------------------------------------------------------------------------------------
                150  American International Group, Inc.                                                $14,044
                200  AON Corp.                                                                          10,350
                300  Bank of Boston Corp.                                                               14,888
                300  BankAmerica Corp.                                                                  23,250
                100  CIGNA Corp.                                                                        11,425
                500  Federal National Mortgage Association                                              15,938
                200  Franklin Resources, Inc.                                                           11,400
                450  MBNA Corp.                                                                         13,330
                100  MGIC Investment Corp.                                                               5,450
                100  Morgan (J.P.) & Co., Inc.                                                           8,300
                200  NationsBank Corp.                                                                  16,025
                300  Travelers, Inc.                                                                    19,800
                                                                                                    ----------
                                                                                                       164,200
Medical Supplies and Devices  (1.2%)
- --------------------------------------------------------------------------------------------------------------
                300  Baxter International, Inc.                                                         13,575
                200  Medtronic, Inc.                                                                    11,925
                                                                                                    ----------
                                                                                                        25,500
Metals and Mining  (0.4%)
- --------------------------------------------------------------------------------------------------------------
                300  Freeport-McMoRan Copper & Gold Co., Inc. Class A                                    9,225

Oil and Gas  (4.4%)
- --------------------------------------------------------------------------------------------------------------
                200  British Petroleum PLC ADR (United Kingdom)                                         21,250
                300  Enron Corp.                                                                        11,063
                400  Halliburton Co.                                                                    22,750
                200  Mobil Corp.                                                                        23,175
                400  Total Corp. ADR (France)                                                           13,600
                                                                                                    ----------
                                                                                                        91,838
Patient Care  (0.6%)
- --------------------------------------------------------------------------------------------------------------
                200  United Healthcare Corp. +                                                          12,300

Pharmaceuticals  (4.9%)
- --------------------------------------------------------------------------------------------------------------
                200  Johnson & Johnson                                                                  18,450
                300  Lilly (Eli) & Co.                                                                  19,500
                200  Pfizer, Inc.                                                                       13,400
                535  Pharmacia & Upjohn, Inc.                                                           21,330
                400  Smithkline Beecham PLC ADR (United Kingdom)                                        20,600
                100  Warner-Lambert Co.                                                                 10,325
                                                                                                    ----------
                                                                                                       103,605
Photography  (0.7%)
- --------------------------------------------------------------------------------------------------------------
                200  Eastman Kodak Co.                                                                  14,200

Retail  (5.2%)
- --------------------------------------------------------------------------------------------------------------
                100  Dayton Hudson Corporation                                                          $8,488
                400  Federated Department Stores Inc. +                                                 12,900
                200  Home Depot, Inc.                                                                    9,575
                400  Officemax, Inc. +                                                                   9,700
                500  Safeway, Inc. +                                                                    14,250
                500  Sears, Roebuck & Co.                                                               24,375
                450  Staples, Inc. +                                                                     9,169
                300  TJX Cos., Inc. (The)                                                                7,538
                400  Walgreen Co.                                                                       13,050
                                                                                                    ----------
                                                                                                       109,045
Telecommunications  (1.6%)
- --------------------------------------------------------------------------------------------------------------
                800  MCI Communications Corp.                                                           24,200
                200  Tellabs, Inc. +                                                                     9,675
                                                                                                    ----------
                                                                                                        33,875
Transportation  (0.8%)
- --------------------------------------------------------------------------------------------------------------
                200  Burlington Northern Santa Fe Corp.                                                 16,425

Utilities  (2.1%)
- --------------------------------------------------------------------------------------------------------------
                400  GTE Corp.                                                                          17,550
                500  SBC Communications, Inc.                                                           26,310
                                                                                                    ----------
                                                                                                        43,860
                     Total Common Stocks (cost $1,080,665)                                          $1,318,582

U.S. GOVERNMENT AND AGENCY OBLIGATIONS  (22.6%) *
PRINCIPAL AMOUNT                                                                                         VALUE
- --------------------------------------------------------------------------------------------------------------
                     Federal National Mortgage Association
            $35,000  7s, TBA, April 16, 2026                                                           $34,103
             30,000  6 1/2s, Dwarfs, TBA, April 16, 2011                                                29,344
             23,271  pass-through certificates 6s, January 1, 2009                                      22,290
             10,000  5.94s, December 12, 2005                                                            9,475
                     Government National Mortgage Association Midgets,
             35,566  pass-through certificates, 7 1/2s, January 15, 2024                                35,489
             23,444  pass-through certificates, 6s, January 15, 2008                                    22,557
                     U.S. Treasury Bonds
             46,000  11 7/8s, November 15, 2003                                                         61,173
             18,000  11 5/8s, November 15, 2004                                                         24,165
             10,000  10 3/4s, August 15, 2005                                                           13,000
             61,000  8 1/8s, August 15, 2019                                                            69,711
             63,000  7 7/8s, November 15, 2004                                                          69,113
              8,000  7 3/4s, February 15, 2001                                                           8,549
             35,000  7 1/4s, August 15, 2004                                                            36,925
             14,000  6 1/4s, February 15, 2003                                                          13,958
              2,000  6 1/4s, May 31, 2000                                                                2,013
             25,000  4 3/4s, August 31, 1998                                                            24,383
                                                                                                    ----------
                     Total U.S. Government and Agency Obligations (cost $474,500))                    $476,248

CORPORATE BONDS AND NOTES  (5.7%) *
PRINCIPAL AMOUNT                                                                                         VALUE
- --------------------------------------------------------------------------------------------------------------
             $5,000  360 Communications Co. sr. notes 7 1/2s, 2006                                      $4,894
              5,000  Bangkok Bank Public Co. 144A sub. notes 8 1/4s, 2016                                4,959
              5,000  BHP Finance (USA), Inc. company guaranty 6.42s, 2026                                4,916
              5,000  Burlington Northern Santa Fe notes 6 3/8s, 2005                                     4,757
              5,000  CCP Insurance, Inc. sr. notes 10 1/2s, 2004                                         5,694
             10,000  Citizens Utilities Co. bonds 7.68s, 2034                                           10,908
              5,000  First National Bank of Omaha 7.32s, 2010                                            4,850
              5,000  Health Care Property Investors, Inc. sr. notes 6 1/2s, 2006 (R)                     4,717
              5,000  Italy (Republic of) global deb. 6 7/8s, 2023                                        4,487
              5,000  Meditrust Corp. med. term notes 7.3s, 2006 (R)                                      4,881
              3,322  Midland Cogeneration Ventures deb. 10.33s, 2002                                     3,530
              7,000  News America Holdings, Inc. sr. notes 12s, 2001                                     7,691
             10,000  Noranda Inc. notes 7s, 2005 (Canada)                                                9,827
              5,000  Northrop Grumman Corp. 144A notes 7s, 2006                                          4,919
              7,000  Parker & Parsley Petroleum Co. sr. notes 8 7/8s, 2005                               7,558
              5,000  Petroliam Nasional Berhad 144A notes, 7 1/8s, 2005 (Malaysia)                       5,025
              4,000  PT Alatief Freeport sr. notes 9 3/4s, 2001 (Netherlands)                            4,325
              5,000  Rodamco NV notes 7 3/4s, 2015 (Netherlands)                                         5,199
              7,000  Telekom Malaysia Berhad 144A deb. 7.87s, 2025 (Malaysia)                            7,111
              5,000  Texas New-Mexico Power Utilities 1st mtge. 9 1/4s, 2000                             5,160
              5,000  Time Warner Inc. deb. 9 1/8s, 2013                                                  5,405
                                                                                                    ----------
                     Total Corporate Bonds and Notes (cost $121,619)                                  $120,813

FOREIGN GOVERNMENT BONDS AND NOTES  (4.6%) *
PRINCIPAL AMOUNT                                                                                         VALUE
- --------------------------------------------------------------------------------------------------------------
AUD          19,000  Australia (Government of) notes 8 3/4s, 2001                                      $14,959
CAD          43,000  Canada (Government of) deb. 7 1/2s, 2001                                           32,276
DEM          15,000  Germany (Republic of) bonds 6 7/8s, 2005                                           10,462
USD           8,000  Quebec (Province of) deb. 8 5/8s, 2005 (Canada)                                     8,788
DEM          25,000  Treuhandanstalt (Germany Republic of) bonds
                     7 1/8s, 2003                                                                       17,936
GBP           8,000  United Kingdom Treasury bonds 10s, 2001                                            13,351
                     Total Foreign Government Bonds and Notes (cost $98,066)                        ----------

COLLATERALIZED MORTGAGE OBLIGATIONS  (1.0%) *                                                          $97,772
PRINCIPAL AMOUNT                                                                                         VALUE
- --------------------------------------------------------------------------------------------------------------
             $5,954  Chase Mortgage Finance Corp. Ser. 93-3, Class B1,
                     7.461s, 2024
              5,845  Housing Securities, Inc. Ser. 93-F, Class F9M2, 7s, 2023                            5,412
                     Prudential Home Mortgage Securities
              7,636  144A Ser. 95-C, Class B1, 7.8158s, 2001                                             7,646
              4,879  Ser. 93-31, Class B2, 6s, 2000                                                      3,354
                                                                                                    ----------
                     Total Collateralized Mortgage Obligations (cost $20,683)                          $20,092
- --------------------------------------------------------------------------------------------------------------
                     Total Investments (cost $1,795,533) ***                                        $2,033,507
- --------------------------------------------------------------------------------------------------------------

*     Percentages indicated are based on net assets of $2,103,036. 
***   The aggregate identified cost on a tax basis is $1,795,533, resulting in gross appreciation and 
      depreciation of $269,708 and $31,734, respectively, or net unrealized appreciation of $237,974.
 +    Non-income-producing security.
(R)  Real Estate Investment Trust, (REIT).

      Securities exempt from registration under Rule 144A of the Securities Act of 1933. These securities 
      may be resold in transactions exempt from registration, normally to qualified institutional buyers.
      
      ADR after the name of a foreign holding stands for American Depository Receipts, representing ownership 
      of foreign securities on deposit with a domestic custodian bank. 

      TBA after the name of a security represents 
      to be announced securities (See Note 1 to Financial Statements).

<CAPTION>
- --------------------------------------------------------------------------------------------
Forward Currency Contracts to Sell at March 31, 1996 
(aggregate face value $85,644)
                                                                        Unrealized
                            Market     Aggregate Face     Delivery     Appreciation/
                            Value          Value            Date      (Depreciation)
- --------------------------------------------------------------------------------------------
Australian Dollars         $15,602        $15,522          6/12/95         $(80)
British Pounds              15,233         15,320          6/12/96           87 
Canadian Dollar             32,984         32,655          6/12/96         (329)
Deutschemarks               21,736         22,147          6/12/96          411 
- --------------------------------------------------------------------------------------------
                                                                          $  89 
- --------------------------------------------------------------------------------------------

The accompanying notes are an integral part of these financial statements

</TABLE>



<TABLE>
<CAPTION>

Statement of assets and liabilities
March 31, 1996 (Unaudited)

<S>                                                                  <C>
Assets
- --------------------------------------------------------------------------------
Investments in securities, at value
(identified cost $1,795,533)  (Note 1)                                $2,033,507
- --------------------------------------------------------------------------------
Cash                                                                     160,178
- --------------------------------------------------------------------------------
Dividends, interest and other receivables                                 12,563
- --------------------------------------------------------------------------------
Receivable for shares of the fund sold                                       475
- --------------------------------------------------------------------------------
Receivable for securities sold                                            64,384
- --------------------------------------------------------------------------------
Receivable for open forward currency contracts                               498
- --------------------------------------------------------------------------------
Receivable for closed forward currency contracts                             236
- --------------------------------------------------------------------------------
Receivable from Manager (Note 2)                                           8,194
- --------------------------------------------------------------------------------
Unamortized organization expenses (Note 1)                                 5,892
- --------------------------------------------------------------------------------
Total assets                                                           2,285,927

Liabilities
- --------------------------------------------------------------------------------
Payable for securities purchased                                         159,253
- --------------------------------------------------------------------------------
Payable for investor servicing and custodian fees (Note 2)                 5,095
- --------------------------------------------------------------------------------
Payable for compensation of Trustees (Note 2)                                 80
- --------------------------------------------------------------------------------
Payable for administrative services (Note 2)                                  10
- --------------------------------------------------------------------------------
Payable for organizational expenses  (Note 1)                              6,425
- --------------------------------------------------------------------------------
Payable for open forward currency contracts                                  409
- --------------------------------------------------------------------------------
Other accrued expenses                                                    11,619
- --------------------------------------------------------------------------------
Total liabilities                                                        182,891
- --------------------------------------------------------------------------------
Net assets                                                            $2,103,036

Represented by
- --------------------------------------------------------------------------------
Paid-in-capital (Notes 1 and 4)                                       $1,757,252
- --------------------------------------------------------------------------------
Undistributed net investment income (Note 1)                               9,998
- --------------------------------------------------------------------------------
Accumulated net realized gain on investments and
foreign currency transactions (Note 1)                                    97,723
- --------------------------------------------------------------------------------
Net unrealized appreciation of investments and
assets and liabilities in foreign currencies                             238,063
- --------------------------------------------------------------------------------
Total -- Representing net assets applicable to
capital shares outstanding                                            $2,103,036

Computation of net asset value and offering price
- --------------------------------------------------------------------------------
Net asset value and redemption price per share
($2,103,036 divided by 203,696 shares)                                    $10.32
- --------------------------------------------------------------------------------
Offering price per share (100/94.25 of $10.32)*                           $10.95
- --------------------------------------------------------------------------------
* 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 March 31, 1996 (Unaudited)

<S>                                                                     <C>
Investment Income:
- --------------------------------------------------------------------------------
Interest                                                                 $22,453
- --------------------------------------------------------------------------------
Dividends (net of foreign tax of $29)                                      9,287
- --------------------------------------------------------------------------------
Total investment income                                                   31,740

Expenses:
- --------------------------------------------------------------------------------
Compensation of Manager (Note 2)                                           6,606
- --------------------------------------------------------------------------------
Investor servicing and custodian fees (Note 2)                            14,157
- --------------------------------------------------------------------------------
Compensation of Trustees (Note 2)                                            785
- --------------------------------------------------------------------------------
Administrative services (Note 2)                                              20
- --------------------------------------------------------------------------------
Amortization of organization expenses (Note 1)                               533
- --------------------------------------------------------------------------------
Reports to shareholders                                                       93
- --------------------------------------------------------------------------------
Registration fees                                                            687
- --------------------------------------------------------------------------------
Auditing                                                                   8,158
- --------------------------------------------------------------------------------
Legal                                                                      1,235
- --------------------------------------------------------------------------------
Postage                                                                        5
- --------------------------------------------------------------------------------
Other                                                                         11
- --------------------------------------------------------------------------------
Fees waived by Manager (Note 2)                                          (24,504)
- --------------------------------------------------------------------------------
Total expenses                                                             7,786
- --------------------------------------------------------------------------------
Expense reduction (Note 2)                                                (2,697)
- --------------------------------------------------------------------------------
Net expenses                                                               5,089
- --------------------------------------------------------------------------------
Net investment income                                                     26,651
- --------------------------------------------------------------------------------
Net realized gain on investments (Notes 1 and 3)                         120,584
- --------------------------------------------------------------------------------
Net realized gain on forward currency contracts and
foreign currency translation (Notes 1 and 3)                                 317
- --------------------------------------------------------------------------------
Net unrealized appreciation on forward currency contracts and
foreign currency translation                                               1,792
- --------------------------------------------------------------------------------
Net unrealized depreciation of investments during the period                (493)
- --------------------------------------------------------------------------------
Net gain on investments                                                  122,200
- --------------------------------------------------------------------------------
Net increase in net assets resulting from operations                    $148,851
- --------------------------------------------------------------------------------

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

</TABLE>



<TABLE>
<CAPTION>

Statement of changes in net assets

                                                                Six months ended      Year ended
                                                                        March 31    September 30
                                                                            1996*           1995
- ------------------------------------------------------------------------------------------------
<S>                                                                     <C>             <C>
Increase in net assets
- ------------------------------------------------------------------------------------------------
Operations:
- ------------------------------------------------------------------------------------------------
Net investment income                                                    $26,651         $42,989
- ------------------------------------------------------------------------------------------------
Net realized gain on investments and
  foreign currency transactions                                          120,901          99,878
- ------------------------------------------------------------------------------------------------
Net unrealized appreciation of investments and
  assets and liabilities in foreign currencies                             1,299         236,764
- ------------------------------------------------------------------------------------------------
Net increase in net assets
  resulting from operations                                              148,851         379,631
- ------------------------------------------------------------------------------------------------
Distributions to shareholders:
- ------------------------------------------------------------------------------------------------
  From net investment income                                             (64,486)             --
- ------------------------------------------------------------------------------------------------
  From net realized gain on investments                                 (119,022)             --
- ------------------------------------------------------------------------------------------------
Increase from capital share transactions (Note 4)                        186,630       1,551,432
- ------------------------------------------------------------------------------------------------
Total increase in net assets                                             151,973       1,931,063
- ------------------------------------------------------------------------------------------------
Net assets
- ------------------------------------------------------------------------------------------------
Beginning of period                                                    1,951,063          20,000
- ------------------------------------------------------------------------------------------------
End of period (including undistributed net investment
  income of $9,998 and $47,833 respectively)                          $2,103,036      $1,951,063
- ------------------------------------------------------------------------------------------------

* 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 31, 1995
                                                                        months     (commencement
                                                                         ended     of operations)
                                                                      March 31   to September 30
                                                                          1996*             1995
- ------------------------------------------------------------------------------------------------
<S>                                                                      <C>             <C>
Net asset value, beginning of period                                      $10.56           $8.50
- ------------------------------------------------------------------------------------------------
Investment operations
- ------------------------------------------------------------------------------------------------
Net investment income                                                        .17(a)          .23(a)
- ------------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss)
on investments                                                               .59            1.83
- ------------------------------------------------------------------------------------------------
Total from investment operations                                             .76            2.06
- ------------------------------------------------------------------------------------------------
Less distributions:
- ------------------------------------------------------------------------------------------------
From net investment income                                                  (.35)             --
- ------------------------------------------------------------------------------------------------
From net realized gain on investments                                       (.65)             --
- ------------------------------------------------------------------------------------------------
Total distributions                                                        (1.00)             --
- ------------------------------------------------------------------------------------------------
Net asset value, end of period                                            $10.32          $10.56
- ------------------------------------------------------------------------------------------------
Total investment return at
net asset value  (%) (b)                                                    7.61(c)        24.24(c)
- ------------------------------------------------------------------------------------------------
Net assets, end of period
(in thousands)                                                            $2,103          $1,951
- ------------------------------------------------------------------------------------------------
Ratio of expenses to average
net assets (%)(d)                                                            .37(a)(c)       .54(a)(c)
- ------------------------------------------------------------------------------------------------
Ratio of net investment income to
average net assets (%)                                                      1.33(a)(c)      2.44(a)(c)
- ------------------------------------------------------------------------------------------------
Portfolio turnover (%)                                                     81.03(c)        95.15(c)
- ------------------------------------------------------------------------------------------------
Average commission rate paid (e)                                          $.0562(c)           --
- ------------------------------------------------------------------------------------------------

*   Unaudited
(a) Reflects an expense limitation during the period (See Note 2). As a result of such limitation, 
    expenses of the fund for the periods ended March 31, 1996 and September 30, 1995 reflect a reduction 
    of $0.16 and $0.23 per share,  respectively.
(b) Total investment return assumes dividend reinvestment and does not reflect the effect of sales charges.
(c) Not annualized.
(d) The ratio of expenses to average net assets for the period ended September 30, 1995 and thereafter 
    includes amounts paid through expense offset arrangements (See Note 2).
(e) Average commission rate paid is presented for fiscal periods beginning January 3, 1995 in conformance 
    with requirements issued by the SEC.

</TABLE>



Notes to financial statements
March 31, 1996 (Unaudited)

Note 1 
Significant accounting policies

The fund is one of 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 in a combination of equity and fixed-income securities.

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. Market quotations are not considered to be readily available for 
long term corporate bonds and notes; such investments are stated at fair 
market value on the basis of valuations furnished by a pricing service, 
approved by the Trustees. 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) Foreign currency translation The accounting records of the fund are 
maintained in U.S. dollars. The market value of foreign securities, 
currency holdings, other assets and liabilities are recorded in the 
books and records of the fund after translation to U.S. dollars based on 
the exchange rates on that day. The cost of each security is determined 
using historical exchange rates. Income and withholding taxes are 
translated at prevailing exchange rates when accrued or incurred. The 
fund does not isolate that portion of realized or unrealized gains or 
losses resulting from changes in the foreign exchange rate on 
investments from fluctuations arising from changes in the market prices 
of the securities. Such fluctuations are included with the net realized 
and unrealized gain or loss on investments. Net realized gains and 
losses on foreign currency transactions represent net exchange gains or 
losses on closed forward currency contracts, disposition of foreign 
currencies and the difference between the amount of investment income 
and foreign withholding taxes recorded on the fund's books and the U.S. 
dollar equivalent amounts actually received or paid. Net unrealized 
gains and losses on foreign currency transactions arise from changes in 
the value of open forward currency contracts and assets and liabilities 
other than investments at the period end, resulting from changes in the 
exchange rate.

F) Forward currency contracts The fund may engage in forward currency 
contracts, which are agreements between two parties to buy and sell 
currencies at a set price on a future date, to protect against a decline 
in value relative to the U.S. dollar of the currencies in which its 
portfolio securities are denominated or quoted (or an increase in the 
value of a currency in which securities a fund intends to buy are 
denominated, when a fund holds cash reserves and short-term 
investments). The U.S. dollar value of forward currency contracts is 
determined using forward currency exchange rates supplied by a quotation 
service. The market value of the contract will fluctuate with changes in 
currency exchange rates. The contract is "marked to market" daily and 
the change in market value is recorded as an unrealized gain or loss. 
When the contract is closed, the fund records a realized gain or loss 
equal to the difference between the value of the contract at the time it 
was opened and the value at the time it was closed. The fund could be 
exposed to risk if the value of the currency changes unfavorably, if the 
counterparties to the contracts are unable to meet the terms of their 
contracts or if the fund is unable to enter into a closing position.

G) TBA purchase commitments The fund, may enter into "TBA" (to be 
announced) purchase commitments to purchase securities for a fixed unit 
price at a future date beyond customary settlement time. Although the 
unit price has been established, the principal value has not been 
finalized. However, the amount of the commitments will not fluctuate 
more than 2.0% from the principal amount. The fund holds, and maintains 
until settlement date, cash or high-grade debt obligations in an amount 
sufficient to meet the purchase price, or the fund may enter into 
offsetting contracts for the forward sale of other securities it owns. 
Income on the securities will not be earned until settlement date. TBA 
purchase commitments may be considered securities in themselves, and 
involve a risk of loss if the value of the security to be purchased 
declines prior to the settlement date, which risk is in addition to the 
risk of decline in the value of the fund's other assets. Unsettled TBA 
purchase commitments are valued at the current market value of the 
underlying securities, generally according to the procedures described 
under "Security valuation" above.

H) 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 at least 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. 

I) Expenses of the trust Expenses directly charged or attributable to 
any fund will be paid from the assets of that 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.

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

Note 2 
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: 0.65% 
of the first $500 million of average net assets, 0.55% of the next $500 
million, 0.50% of the next $500 million, 0.45% of the next $5 billion, 
0.425% of the next $5 billion, 0.405% of the next $5 billion, 0.39% of 
the next $5 billion, and 0.38% thereafter.

Through November 30, 1996, Putnam Management has voluntarily agreed to 
limit expenses to an annual rate of 0.70% of the fund's average net 
assets. The fund's expenses subject to this limitation are exclusive of 
brokerage, interest, taxes, deferred organizational expenses, 
extraordinary expenses and credits from Putnam Fiduciary Trust Company 
("PFTC"), a wholly-owned subsidiary of Putnam Investments, Inc., if any.
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 Putnam 
Fiduciary Trust Company (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 March 31, 1996, the fund expenses were reduced 
by $2,697 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 arrangement in an income producing 
asset if it had not agreed to enter into such arrangements.

The fund has adopted a distribution plan (the "Plan") pursuant to Rule 
12b-1 under the Investment Company Act of 1940, although the fund is not 
currently making any payments pursuant to the 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 Plan 
provides for payments by the fund to Putnam Mutual Funds Corp. at an 
annual rate of up to 0.35% of the average net assets.

During the six months ended March 31, 1996, Putnam Mutual Funds Corp., 
acting as the underwriter, received no net commissions from the sale of 
shares of the fund.

Note 3 
Purchases and sales of securities

During the six months March 31, 1996, purchases and sales of investment 
securities other than short-term investments aggregated $1,561,632 and 
$1,521,342 respectively. There were no purchases or 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 4 
Capital shares

At March 31, 1996, there was an unlimited number of shares of beneficial 
interest authorized. Transactions in capital shares were as follows:

                          Six months ended 
                           March 31, 1996
- ----------------------------------------------------
                         Shares       Amount
- ----------------------------------------------------
Shares sold               1,002      $10,200
- ----------------------------------------------------
Shares issued in 
connection with 
reinvestment of 
distributions            18,630     183,507
- ----------------------------------------------------
                         19,632     193,707

Shares repurchased         (672)     (7,077)
- ----------------------------------------------------
Net increase             18,960    $186,630
- ----------------------------------------------------
                           For the period 
                           January 3, 1995 
                         (commencement of 
                           operations) to 
                         September 30, 1995
- ----------------------------------------------------
                         Shares      Amount
- ----------------------------------------------------
Shares sold             183,163  $1,559,513
- ----------------------------------------------------
Shares issued in 
connection with 
reinvestment of 
distributions                --         --
- ----------------------------------------------------
                        183,163  1,559,513

Shares repurchased         (780)    (8,081)
- ----------------------------------------------------
Net increase            182,383 $1,551,432
- ----------------------------------------------------



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

David Santos
Vice President and Fund Manager

Kenneth J. Taubes
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 Balanced 
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 
the principal amount invested.


24522-318     5/96



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