PUTNAM TAX EXEMPT MONEY MARKET FUND
N-30D, 1994-05-23
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Putnam 
Tax-Exempt 
Money Market 
Fund 

Semiannual 
Report 
March 31, 1994 

For investors seeking 
current income 
free from federal income 
tax, consistent with capital 
preservation, stable principal 
and liquidity 

A member 
of the Putnam 
Family of Funds 

<TABLE>
<CAPTION>
<S> <C>
    Contents 
2   How your fund performed 
3   From the Chairman 
4   Report from Putnam Management 
    Semiannual Report 
6   Portfolio of investments owned 
10  Financial statements 
15  Fund performance supplement 
</TABLE>

<PAGE>

How your 
fund performed 
For periods ended March 31, 1994 
<TABLE>
<CAPTION>
Total return*                          Lipper 
                                   Tax Exempt 
                                 Money Market       Consumer 
                        Fund     Fund Average    Price Index 
<S>                    <C>       <C>                    <C>
6 months                0.80%            0.93%          1.45% 
1 year                  1.64             1.91           2.51 
3 years                 8.05             8.22           9.04 
 annualized             2.62             2.67           2.93 
5 years                20.54            20.58          20.36 
 annualized             3.81             3.81           3.78 
Life-of-fund 
 (since 10/26/87)      29.30            29.15          27.67 
 annualized             4.08             4.07           3.87 
</TABLE>

<TABLE>
<S>               <C>        <C>              <C> 
Distributions(a)              Investment 
6 months ended    Number          income          Total 
March 31, 1994         6       $0.007972      $0.007972 
</TABLE>
Current returns at the end of the period 

<TABLE>
<CAPTION>
                                            Taxable 
                         Fund          equivalents+ 
<S>                      <C>                   <C>
Current 30-day yield     1.67%                 2.76% 
Current 7-day yield      1.61                  2.67 
</TABLE>
* Performance data represent past results. Investment return will fluctuate. 

(a) For some investors, investment income may also be subject to the 
alternative minimum tax. 

+ Taxable equivalent rates cited assume the maximum federal tax rate of 
39.6%. State and local taxes may also apply. Results for investors subject to 
lower tax rates would not be as advantageous, although many such investors 
would have the opportunity to receive attractive tax benefits from a fund 
investment. Consult your tax advisor for more guidance. 

An investment in the fund is neither insured nor guaranteed by the U.S. 
government. There can be no assurance that the fund will be able to maintain 
a stable net asset value of $1.00 per share. However, since the fund's 
inception on 10/26/87, no investor has ever lost a penny of principal. 

Terms you need to know 

Total return is the change in value of an investment from the beginning to 
the end of a period, assuming the reinvestment of all distributions. 

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

Current yield is the rate at which an investment earns current interest 
income. The 7- and 30-day yields are the two most common gauges for measuring 
money market mutual fund performance. 

Taxable equivalent return is the rate at which a taxable investment would 
have to generate income to equal the fund's current dividend rate or 
yield. 

Please see the fund performance supplement on page 15 for additional 
information about performance comparisons. 

<PAGE>

From the 
Chairman 

(George Putnam photo) 

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

Dear Shareholder: 

For the semiannual period ended March 31, l994, Putnam Tax Exempt Money 
Market Fund once again delivered competitive performance, continuing to 
produce a steady stream of tax-free income. 

After several months of steadily declining interest rates, the Federal 
Reserve staged a preemptive strike against inflation in early February, 
increasing the Federal funds rate--the interest rate banks charge each other 
for overnight loans. This action effectively raised all short-term interest 
rates. Early in the semiannual period, in anticipation of the Fed's move, 
Fund Manager Lindsey Callen began shortening maturities on securities in the 
portfolio and increasing the fund's weightings in floating-rate securities. 
This strategy allowed your fund to take advantage of higher yields. 

Although inflation currently remains under control, there is a good chance 
that the Fed may raise rates again in another effort to curb inflation 
threats before they happen. In the coming months, Lindsey will work to 
position the portfolio to take advantage of interest rate movements. At the 
same time, we will continue our commitment to maintaining the fund's superior 
quality and stability. 

Respectfully yours, 

(George Putnam Signature) 

George Putnam 
May 18, 1994 

<PAGE>

Report from 
Putnam Management 

For the six-month period ended March 31, l994, Putnam Tax Exempt Money Market 
Fund reported solid performance. As the table on the inside front cover 
indicates, your fund's 30-day current yield of 1.67% is the equivalent of a 
2.76% yield on a taxable investment for investors in the maximum federal 
income tax bracket of 39.6%. Those in lower brackets would also enjoy tax 
benefits, though to a lesser extent. 

Capitalizing on higher interest rates After interest rates sank to historic 
lows this past fall, we expected a reversal of this trend. Early in the 
period, we began positioning the fund to take advantage of incrementally 
higher yields. To this end, we decreased the average maturity of the 
portfolio, so that we would not be locked into lower-coupon securities in a 
rising interest rate environment. We also increased the number of floating- 
rate securities in the portfolio. Interest rates on these securities are 
reset at fixed intervals (weekly or monthly), so that when market rates rise, 
the fund can benefit. By the end of the period, we had increased the 
floating-rate securities position in the portfolio to 65%. The remainder of 
the portfolio was invested in fixed-rate notes and tax-exempt commercial 
paper. 

Supply/demand dynamics During the six-month period, the demand for tax- 
exempt securities increased, as investors sought to shelter some of their 
income from higher federal income taxes. At the same time, supply of tax- 
exempt money market securities was relatively weak. This is partly because 
many state governments have become more fiscally prudent, and as they tighten 
controls on their budgets, they issue fewer short-term notes to fund 
municipal projects. They have also taken advantage of low long-term rates to 
lengthen their issuance periods. In addition, the bulk of tax-exempt money 
market instruments are issued in the summer. While we anticipate new issuance 
to be somewhat lower than in past seasons, over the next several months 
Putnam's credit analysts will be targeting and evaluating securities from a 
wide range of states, municipalities and other issuers to find the most 
attractive investments for your Fund. 

Maintaining portfolio quality Superior portfolio quality is one of the most 
important attributes of your fund. Ideally, every holding must be rated in 
one of the two highest categories by at least two nationally recognized 
rating services. 

<PAGE>

* If only one rating service has rated the security, it must be in one of the 
two highest categories rated by that service. 

* If the securities are unrated, Putnam management must judge them to be of 
equivalent quality. 

In addition, we monitor the quality of each investment carefully for as long 
as it remains in the portfolio, making sure it provides the right balance of 
attractive yield and relative stability. We also scrutinize all kinds of 
market trends and factors that could affect the financial strength of each 
security's issuer in any way, working to ensure the continued high credit 
quality of every portfolio holding. 

Looking ahead A continuation of the strengthening economy could prompt the 
Federal Reserve to raise rates again in order to keep a tight rein on 
inflation. The current goal appears to be a "neutral" Federal funds rate, 
usually defined as 1% over the inflation rate. Even if inflation remains 
relatively low (at or below 3%), this could mean substantially higher 
short-term rates in the next several months. 

Over the next few months, we will be closely monitoring economic developments 
in an effort to determine the trend of interest rates. We will also be 
preparing the fund to be in the most advantageous position to benefit from 
that trend. 

Performance comparisons (3/31/94) 
<TABLE>
<CAPTION>
                       Current       Net return 
                        return     after taxes* 
<S>                       <C>              <C>
Passbook savings          2.00%            1.21% 
Taxable money market 
  fund 7-day yield        2.93%            1.77% 
3-month CD                2.60%            1.57% 
Putnam Tax Exempt 
  MM 7-day yield          1.61%            1.61% 
</TABLE>
*Assumes maximum federal income tax bracket of 39.6%. State and local income 
taxes, and for some investors, the federal alternative minimum tax, will 
apply. The principal value of money market mutual funds is uninsured and 
designed to be fixed while distributions vary daily. The principal value on 
passbook savings and bank CDs are generally insured up to certain limits by 
state and federal agencies. Unlike money market mutual funds, substantial 
penalties may apply to early withdrawals of bank CDs. Performance data 
represent past performance. Investment returns will fluctuate. Sources: Bank 
of Boston (passbook savings). Bank Rate Monitor (3-month CDs). IBC/Donoghue's 
Money Fund Report (taxable money market fund 7-day yield). 

<PAGE>

Portfolio of 
investments owned 
March 31,1994 (Unaudited) 
 Municipal Bonds and Notes (86.6%)(a) 

<TABLE>
<CAPTION>
 Principal Amount                                         Ratings (b)           Value 
<S>                            <C>                              <C>       <C>
California (13.2%) 
$1,000,000                     CA Higher Ed. Loan Auth. 
                               Inc. Student Loan 
                               Variable Rate Demand 
                               Notes (VRDN) (Industrial 
                               Bank of Japan LOC) 2.9s, 
                               8/1/03                           VMIG1     $ 1,000,000 
3,100,000                      CA State Rev. Antic. 
                               Notes, 3-1/2s, 6/28/94            MIG1       3,106,644 
1,000,000                      Fontana, Certif. of 
                               Participation VRDN 
                               (Sakura Bank, Ltd. LOC), 
                               2.85s, 7/1/21                      A-1       1,000,000 
3,495,000                      Los Angeles Cnty., Tax & 
                               Revenue Antic. Notes 
                               (TRAN), Ser. A., 3s, 
                               6/30/94                           SP1+       3,497,604 
4,000,000                      Pomona, Redev. Agcy. 
                               Multi-Fam. VRDN (Bauer 
                               Group Apts.) 2-1/2s, 
                               12/1/07                           A-1+       4,000,000 
1,000,000                      San Diego Cnty., TRAN Ser. 
                               A. 3-1/4s, 7/29/94                MIG1       1,001,672 
                                                                           13,605,920 
Colorado (0.8%) 
800,000                        Lakewood, Multi-Fam. 
                               Hsg. VRDN (Dai Ichi Kango 
                               Bank LOC) (St. Moritz and 
                               Diamond Head), 2.65s, 
                               10/1/07                          VMIG1         800,000 
Delaware (2.0%) 
2,000,000                      Wilmington, Delaware 
                               Hospital VRDN (Societe 
                               Generale LOC) 
                               (Franciscan Hlth. 
                               System), Ser. A, 2.7s, 
                               7/1/11                           VMIG1       2,000,000 

<PAGE>

District of Columbia (1.7%) 
$1,765,000                     District of Columbia 
                               Hosp. Rev. Bonds 
                               (Medlantic Healthcare), 
                               Ser. A, Municipal Bond 
                               Insurance Association 
                               (MBIA), 3s, 8/15/94                AAA     $ 1,765,000 
Georgia (3.4%) 
2,500,000                      Atlanta, Urban Res. Fin. 
                               Auth. Multi-Fam. Mtge. 
                               VRDN (Sanwa Bank LOC) 
                               (Rental-West Paces), 
                               Ser. A, 2.45s, 12/1/08            A-1+       2,500,000 
1,000,000                      Dekalb Co., Hsg. Auth. 
                               VRDN (Bank of Montreal 
                               LOC), 2.35s, 12/1/07              A-1+       1,000,000 
                                                                            3,500,000 
Illinois (4.7%) 
2,000,000                      Elmhurst, VRDN 
                               (Commonwealth Bank of 
                               Australia LOC) 
                               (Joint Accreditation 
                               Commission), 2.4s, 
                               7/1/18                           VMIG1       2,000,000 
800,000                        IL. Hlth. Fac. Auth. VRDN 
                               (Societe Generale LOC) 
                               (Midwest Cambridge 
                               Project), 2.65s, 1/1/15            P-1         800,000 
2,000,000                      IL. State General 
                               Obligation (G.O.) 
                               Certif. 3-1/4s, 4/15/94           SP1+       2,000,618 
                                                                            4,800,618 

<PAGE>

Indiana (2.0%) 
2,000,000                      Mount Vernon, Poll. 
                               Control VRDN (Southern IN 
                               Gas & Elec. Co.), Ser. A, 
                               2.7s, 5/1/15                        AA       2,000,000 
Iowa (6.1%) 
$1,140,000                     Des Moines, Private 
                               College VRDN (Lloyds Bank 
                               LOC) (U. of Osteopathic 
                               Medicine & Hlth.), 2.65s, 
                               5/15/15                           A-1+      $1,140,000 
2,000,000                      Iowa State TRAN (Union 
                               Bank of Switzerland LOC), 
                               Ser. A, 3-1/4s, 6/30/94           SP1+       2,002,331 
3,095,000                      Salix, Mid-West Pwr. 
                               VRDN, 2.4s, 5/1/23               VMIG1       3,095,000 
                                                                            6,237,331 
Kentucky (4.4%) 
1,514,000                      Jefferson Cnty., Indl. 
                               Dev. VRDN (Chemical Bank 
                               LOC) (Belknap Inc. 
                               Project), 2.6s, 12/1/14            A-1       1,514,000 
3,000,000                      Ohio Cnty., Kentuckty 
                               Poll. Control VRDN 
                               (Chemical Bank LOC), 3s, 
                               10/1/15                            P-1       3,000,000 
                                                                            4,514,000 
Louisiana (2.4%) 
1,300,000                      LA State Recvy. Dist. 
                               Sales Tax VRDN (Swiss Bank 
                               Corp. LOC), MBIA, 2.65s, 
                               7/1/98                           VMIG1       1,300,000 
1,170,000                      Orleans, Levee Dist. 
                               Impt. VRDN (Fugi Bank 
                               LOC), 3.95s, 11/1/14             VMIG1       1,170,000 
                                                                            2,470,000 
Maryland (2.0%) 
2,000,000                      Baltimore, Hwy. User Rev. 
                               Antic Notes (RAN) 3-1/2s, 
                               6/28/94                           MIG1       2,001,753 

Massachusetts (3.9%) 
4,000,000                      MA State G.O. Bonds 
                               (National Westminster 
                               Bank PLC LOC), Ser. B, 
                               VRDN, 2.65s, 12/1/97             VMIG1       4,000,000 

<PAGE>

Michigan (1.9%) 
$1,900,000                     MI State Job Dev. Auth. 
                               VRDN (First Bank N.A. 
                               LOC), 2.6s, 12/1/14                A-1      $1,900,000 
Minnesota (1.8%) 
400,000                        Alberta Lea, Indl. Dev. 
                               VRDN (Chemical Bank LOC) 
                               (Joyce Intl. Inc. 
                               Project), 2.6s, 7/1/94             A-1         400,000 
1,500,000                      St. Louis Park, Indl. Dev. 
                               VRDN (Banque Paribas LOC) 
                               (Unicare Home INC. 
                               Project), 2.55s, 8/1/14            A-1       1,500,000 
                                                                            1,900,000 
Mississippi (1.4%) 
1,400,000                      Jackson Cnty, Poll. 
                               Control VRDN (Chevron USA 
                               Inc. Project), 2.55s, 
                               12/1/16                            P-1       1,400,000 
New Hampshire (4.6%) 
3,700,000                      NH Higher Ed. & Hlth. Fac. 
                               Auth. VRDN (VHA New 
                               England Inc.), Ser. F, 
                               American Municipal Bond 
                               Assurance Corp., 2.2s, 
                               12/1/25                            AAA       3,700,000 
1,000,000                      NH State Bus. Fin. Auth. 
                               Poll. Control VRDN, 
                               2.95s, 11/1/20                   VMIG1       1,000,000 
                                                                            4,700,000 
New York (1.9%) 
2,000,000                      NY State Energy Research 
                               & Dev. Auth. Poll. Control 
                               VRDN (Toronto Dominion 
                               Bank LOC) (Niagara Mohawk 
                               Pwr.), Ser. A, 2.65s, 
                               7/1/15                            A-1+       2,000,000 
Ohio (1.9%) 
$2,000,000                     Evendale, Indl. Dev. VRDN 
                               (ABN-Armo Bank LOC) (SHV 
                               Real Estate Inc.), 2.2s, 
                               9/1/15                             A-1     $ 2,000,000 

<PAGE>

Oklahoma (7.9%) 
1,695,000                      OK Cnty., Indl. Auth. VRDN 
                               (Texas Commerce Bank NA 
                               (LOC) (Fred Jones Mfg. Co. 
                               Project), 2-3/4s, 
                               10/1/21                            A-1       1,695,000 
2,000,000                      OK School Dist. Cash 
                               Managment Certif. of 
                               Participation 3.18s, 
                               6/29/94                           SP1+       2,002,063 
3,000,000                      OK State Wtr. Res. Board 
                               State Loan Program VRDN 
                               Ser. A. 2.85s, 9/1/23             A-1+       3,000,000 
1,465,000                      Tulsa Cnty. Indl. Auth. 
                               Hlth. Care VRDN (Laureate 
                               Psychiatric Project), 
                               2.4s, 12/15/08                    A-1+       1,465,000 
                                                                            8,162,063 
Pennsylvania (2.7%) 
2,800,000                      Allegheny Cnty., Hosp. 
                               Dev. Auth. VRDN 
                               (Presbyterian Hlth. 
                               Ctr.), Ser. C, MBIA, 
                               2-1/4s, 3/1/20                   VMIG1       2,800,000 
South Dakota (2.9%) 
2,940,000                      Rapid City, Economic Dev. 
                               VRDN (Bayerische 
                               Vereinsbank AG LOC) 
                               (Civic Ctr. Assn. 
                               Partnership), 2.45s, 
                               12/1/16                            P-1       2,940,000 

<PAGE>

Texas (5.5%) 
$2,500,000                     Bexar Cnty. Hsg. Fin. 
                               Corp. VRDN (Sakura Bank, 
                               Ltd LOC), Ser. A, 2.65s, 
                               11/1/06                            A-1     $ 2,500,000 
1,250,000                      Lower Neches Valley, 
                               Poll. Control VRDN 
                               (Chevron Corp. Project), 
                               2.7s, 
                               2/15/17                           A-1+       1,250,000 
1,900,000                      North Central Hlth. Fac. 
                               Dev. Corp., Hosp. VRDN 
                               (Presbyterian Med. 
                               Ctr.), Ser. D, MBIA, 
                               2.65s, 12/1/15                     A-1       1,900,000 
                                                                            5,650,000 
Utah (1.9%) 
2,000,000                      Salt Lake Cnty. 
                               Multi-Fam. Hsg. VRDN 
                               (Dai-Ichi Kango Bank LOC) 
                               (James Pointe Apts. 
                               Project), Ser. 87-A, 
                               2.45s, 10/1/16                   VMIG1       2,000,000 
Washington (0.8%) 
770,000                        Washington State Hsg. 
                               Fin. Auth. VRDN Ser. D, 
                               2.8s, 1/1/26                      SP1+         770,000 
Wisconsin (4.8%) 
2,900,000                      Alma, Poll. Control VRDN 
                               (Rabo Bank LOC) 
                               (Dairyland Pwr. Coop. 
                               Project), 2.55s, 2/1/15            P-1       2,900,000 
2,000,000                      WI State TRAN, 3-1/4s, 
                               6/15/94                           SP1+       2,001,473 
                                                                            4,901,473 
                               Total Municipal Bonds and Notes 
                                (cost $ 88,818,158)                       $88,818,158 

<PAGE>

Municipal Commercial Paper     Chesterfield Cnty., VA 
  (12.7%) (a)                  Rev. Bonds (Bank of New 
  $2,500,000                   York, Nations Bank, 
                               Mitsubishi Bank, Sanwa 
                               Bank Liquidity), 2.4s, 
                               4/7/94                           VMIG1    $  2,500,000 
2,500,000                      GA Muni Electric Auth. 
                               Rev. Bonds (Credit Suisse 
                               Group LOC), 2s, 4/4/94             AAA       2,500,000 
500,000                        Lone Star, TX Arpt. Impt. 
                               Auth. Rev. Bonds (Bank of 
                               New York LOC) (American 
                               Airlines, Inc.), Ser. 
                               B-2, 2.45s, 4/11/94              VMIG1         500,000 
1,600,000                      Orange Cnty., CA Apt. Rev. 
                               Bonds (Dai-Ichi Kango 
                               Bank LOC) (Irvine Co.), 
                               2.45s, 4/4/94                    VMIG1       1,600,000 
1,900,000                      Rochester, MN Hlth. Care 
                               Fac. Rev. Bonds (May 
                               Foundation/Mayo Med. 
                               Ctr.), Ser. F, 2-1/2s, 
                               5/16/94                           A-1+       1,900,000 
3,000,000                      Texas State G.O. Bonds, 
                               2.4s, 6/7/94                     VMIG1       3,000,000 
1,100,000                      W. Orange, Tax District 
                               Rev. Bonds (Societe 
                               Generale LOC) (Fl. 
                               Memorial Hosp.), 2 1/2s, 
                               6/14/94                          VMIG1       1,100,000 
                               Total Municipal Commercial Paper 
                                (cost $13,100,000)                       $ 13,100,000 
                               Total Investments 
                               (cost $101,918,158)(c)                    $101,918,158 

</TABLE>
(a) Percentages indicated are based on total net assets of $102,538,566, 
which correspond to a net asset value per share of $ 1.00. 
(b) The Moody's or Standard & Poor's ratings indicated are believed to be the 
most recent ratings available at March 31, 1994 for the securities listed. 
Ratings are generally ascribed to securities at the time of issuance. While 
the agencies may from time to time revise such ratings, they undertake no 
obligation to do so, and the ratings do not necessarily represent what the 
agencies would ascribe to these securities at March 31, 1994. Securities 
rated by Putnam are indicated by "/P" and are not publicly rated. 
Moody's Investors Services, Inc. and Standard & Poor's Corp. are the leading 
independent rating agencies for debt securities. Moody's uses the designation 
"Moody's Investment Grade," or "MIG," for most short-term municipal 
obligations, adding a "V" ("VIMIG") for bonds with a demand or variable 
feature; the designation "P" is used for tax-exempt commercial paper. 
Standard & Poor's uses "SP" for notes maturing in three years or less, "A" 
for bonds with a demand or variable feature. 
Moody's Investors Services, Inc. 
MIG1/VMIG1 = Best quality; strong protection of cash flow, superior liquidity 
and broad access to refinancing 
MIG2/VMIG2 = High quality; ample protection of cash flow, liquidity support 
and ability to refinance 
AAA = Capacity to pay interest and repay principal is extremely strong 
AA = Strong capacity to pay interest and repay principal and differs from the 
higher rated issues only in a small degree 
   Standard & Poor's Corp. 
P-1 = Superior capacity for repayment 
P-2 = Strong capacity for repayment 
SP-1 = Overwhelming safety characteristics 
SP-2 = Strong capacity to pay principal and interest 
A-1+ = Overwhelming degree of credit protection 
A-1 = Strong degree of safety 
A-2 = Considered strong but lacks solid strength for timely repayment 
(c) The aggregate identified cost on a tax basis is the same. 
The rates shown on Variable Rate Demand Notes (VRDN) are the current interest 
rates at March 31, 1994, which are subject to change based on the terms of 
the security. 
The Fund had the following industry group concentrations greater than 10% on 
March 31, 1994 (as a percentage of net assets): 

Hospital/Healthcare 17.0% 
Housing             14.8% 
Pollution Control   13.2% 

<PAGE>

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

<TABLE>
<S>                <C>                                                           <C>            <C>
Assets             Investments in securities, at amortized cost (Note 1)                        $101,918,158 
                   Cash                                                                            3,122,476 
                   Interest and other receivables                                                    615,790 
                   Receivable for shares of the Fund sold                                            858,496 
                   Receivable for securities sold                                                     14,639 
                     Total assets                                                                106,529,559 
Liabilities        Distributions payable to shareholders                         $   10,157 
                   Payable for securities purchased                               2,804,898 
                   Payable for shares of the Fund repurchased                     1,023,790 
                   Payable for compensation of Manager (Note 2)                      95,263 
                   Payable for administrative services (Note2)                        2,951 
                   Payable for compensation of Trustees (Note 2)                      2,757 
                   Payable for investor servicing and custodian fees (Note 
                     2)                                                              26,169 
                   Other accrued expenses                                            25,008 
                     Total Liabilities                                                             3,990,993 
                   Net assets                                                                   $102,538,566 
Represented by     Paid-in capital (Notes 4 and 5)                                              $102,538,566 
                   Net asset value, offering and redemption price per share ($102,538,566 divided by 
                      102,538,566 shares)                                                       $       1.00 
</TABLE>

<PAGE>

Statement of 
operations 
Six months ended March 31, 1994 (unaudited) 
<TABLE>
<CAPTION>
<S>                                      <C>           <C>
Tax exempt interest income                             $1,002,720 
Expenses: 
Compensation of Manager (Note 2)         $178,928 
Investor servicing and custodian 
  fees (Note 2)                            80,567 
Compensation of Trustees (Note 2)           5,535 
Reports to shareholders                     9,972 
Auditing                                    7,231 
Legal                                       5,784 
Postage                                     9,176 
Administrative services (Note 2)            3,092 
Distribution fees (Note 2)                 18,293 
Other expenses                             30,973 
  Total expenses                                          349,551 
Net investment income                                     653,169 
Net increase in net assets 
  resulting from operations                            $  653,169 
</TABLE>

Statement of 
changes in net assets 
<TABLE>
<CAPTION>
                          Six months ended            Year ended 
                                  March 31          September 30 
<S>                           <C>                   <C>
                                     1994*                  1993 
Increase (Decrease) 
  in net assets 
Operations: 
Net investment income         $    653,169           $ 1,467,365 
Net realized gain on 
  investments                      --                      3,603 
Net increase in net 
  assets resulting 
  from operations                  653,169             1,470,968 
Distributions to 
  shareholders from: 
Net investment income             (653,169)           (1,470,968) 
Increase (Decrease) 
  from capital share 
  transactions 
  (Note 4)                      21,462,782              (744,101) 
Total increase 
  (decrease) in net 
  assets                        21,462,782              (744,101) 
Net assets 
Beginning of period             81,075,784            81,819,885 
End of period                 $102,538,566           $81,075,784 
</TABLE>
*Unaudited. 


<PAGE>

Financial 
highlights* 
(For a share 
outstanding 
throughout the period) 
<TABLE>
<CAPTION>
                                                                                                             For the period 
                                                                                                           October 26, 1987 
                               Six Months                                                                     (commencement 
                                    ended                                                                 of operations) to 
                                 March 31                     Year ended September 30                          September 30 
                                   1994**        1993        1992        1991        1990        1989                  1988 
<S>                              <C>          <C>         <C>        <C>         <C>          <C>                   <C>
Investment 
  Operations 
Net Investment 
  Income                            .0080       .0184       .0297(a)    .0462(a)    .0548(a)    .0578(a)              .0424(a) 
Net Realized Gain (Loss) on 
  Investments                       --           --          --        (.0001)      --           --                   .0002 
Total from Investment 
  Operations                        .0080       .0184       .0297       .0461       .0548       .0578                 .0426 
Total Distributions                (.0080)     (.0184)     (.0297)     (.0461)     (.0548)     (.0578)               (.0426) 
Total Investment Return at 
  Net Asset Value (%) (b)            1.60(c)     1.85        3.02        4.74        5.61        5.92                  4.68(c) 
Net Assets, End of Period 
  (in thousands)                 $102,539     $81,076     $81,820    $100,077    $111,705     $98,867               $83,336 
Ratio of Expenses to 
  Average Net Assets (%)              .88(c)      .99         .87(a)      .79(a)      .68(a)      .69(a)                .62(a)(c) 
   
Ratio of Net Investment 
  Income to Average Net 
  Assets (%)                         1.64(c)     1.85        2.99(a)     4.62(a)     5.45(a)     5.79(a)               4.62(a)(c) 
   
</TABLE>
  * Financial highlights for periods ended through September 30, 1992 have 
    been restated to conform with requirements issued by the SEC in April 
    1993. 
** Unaudited 
(a) Reflects a voluntary expense limitation and, during the period ended 
    September 30, 1988, a waiver of a portion of distribution fees in effect 
    during the period. As a result of such limitation and waiver, expenses of 
    the Fund for the years ended September 30, 1992, 1991, 1990, 1989 and the 
    period ended September 30, 1988 reflect per share reductions of 
    approximately $0.0029, $0.0030, $0.0034, $0.0035 and $0.0047, 
    respectively. 
(b) Total investment return assumes dividend reinvestment and does not 
    reflect the effect of sales charges. 
(c) Annualized. 

<PAGE>

Notes to 
financial statements 
March 31, 1994 (unaudited) 

Note 1 Significant accounting policies 

The Fund is registered under the Investment Company Act of 1940, as amended, 
as a diversified, open-end management investment company. The Fund seeks as 
high a level of current income exempt from federal income tax as is 
consistent with maintenance of liquidity and stability of principal by 
investing primarily in a diversified portfolio of short-term tax exempt 
securities. 

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

A) Security valuations The valuation of the Fund's portfolio instruments is 
determined by means of the amortized cost method as set forth in Rule 2a-7 
under the Investment Company Act of 1940. The amortized cost of an instrument 
is determined by valuing it at cost originally and thereafter amortizing any 
discount or premium from its face value at a constant rate until maturity. 

B) Security transactions Security transactions are accounted for on the trade 
date (date the order to buy or sell is executed). 

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

At September 30, 1993, the Fund had a capital loss carryover of approximately 
$2,109 which may be available to offset realized capital gains to the extent 
provided by regulations, this amount will expire September 30, 2000. To the 
extent that capital loss carryovers are used so offset realized capital 
gains, it is unlikely capital gains will be distributed to shareholders, 
since any distribution might be taxable as ordinary income. 

D) Interest income and distributions to shareholders Interest is recorded on 
the accrual basis. Income distributions (and distributions of capital gains, 
if any) are recorded daily by the Fund and distributed monthly to the 
shareholders. 

Note 2 Management fee, administrative services, and other transactions 

Compensation of Putnam Investment Management, Inc., "Putnam Management," the 
Fund's Manager, a wholly-owned subsidiary of Putnam Investments, Inc., for 
management and investment advisory services is paid quarterly based on the 
average net assets of the Fund. Such fee is based on the following annual 
rates: 0.45% of the first $500 million of average net assets, 0.35% of the 
next $500 million, 0.30% of the next $500 million, and 0.25% of any amount 
over $1.5 billion, subject to reduction in any year by the amount of certain 
brokerage commissions and fees (less expenses) received by affiliates of the 
Manager on the Fund's portfolio transactions. 

The Fund also reimburses the Manager for the compensation and related 
expenses of certain officers of the Fund and their staff who provide 
administrative services to the Fund. The aggregate amount of all such 
reimbursements is determined annually by the Trustees. For the six months 
ended March 31, 1994, the Fund paid $3,092 for these services. 

Trustees of the Fund receive an annual Trustee's fee of $440 and an 
additional fee for each Trustees' meeting attended. Trustees who are not 
interested persons of the Manager and who serve on committees of the Trustees 
receive additional fees for attendance at certain committee meetings. 

Custodial functions for the Fund are provided by Putnam Fiduciary Trust 
Company (PFTC), a subsidiary of Putnam Investments, Inc. Investor servicing 
agent functions are provided by Putnam Investor Services, a division of PFTC. 
Fees paid for these investor servicing and custodial functions for the six 
months ended March 31, 1994 amounted to $80,567. 

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

Pursuant to the Fund's underwriting agreement and to a distribution plan 
adopted under Rule 12b-1 of the Investment Company 

<PAGE>

Act of 1940, the Fund pays Putnam Mutual Funds Corp., a wholly-owned 
subsidiary of Putnam Investments, Inc., a quarterly distribution fee at the 
annual rate of 0.10% of the average broker net assets of the Fund. For the 
six months ended March 31, 1994, the Fund paid distribution fees in the 
amount of $18,293. 

Note 3 Purchases and sales of securities 

During the six months ended March 31, 1994, purchases and sales (including 
maturities) of investment securities (all short-term obligations) aggregated 
$214,422,632 and $195,600,000, respectively. 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, 1994, there was an unlimited number of shares of beneficial 
interest authorized. Transactions in capital shares, at a constant net asset 
value of $1.00 per share, were as follows: 

<TABLE>
<CAPTION>
                                                 Six Months ended                      Year ended 
                                                         March 31                    September 30 
                                                             1994                            1993 
<S>                                                  <C>                             <C>  
Shares sold                                           238,363,808                     324,783,397 
Shares issued in connection with 
  reinvestment of distributions                           590,505                       1,511,810 
                                                      238,954,313                     326,295,207 
Shares repurchased                                   (217,491,531)                   (327,039,308) 
Net increase (decrease)                                21,462,782                        (744,101) 
</TABLE>
Note 5 Reclassification of Capital Accounts 

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

There were no cumulative adjustments, as a result of the SOP, to 
undistributed net investment income or accumulated net realized gains. 

Any adjustments would represent the cumulated amounts necessary to report 
balances through September 30, 1993, the close of the Fund's most recent 
fiscal year end for financial reporting and tax purposes. 

<PAGE>

Note 6 Proposed Merger 

If approved at the shareholder meeting on June 2, 1994, Putnam Tax Exempt 
Money Market Fund will acquire the assets of Putnam California Tax Exempt 
Money Market Fund and Putnam New York Tax Exempt Money Market Fund in 
exchange for the assumption of the acquired funds' liabilities and for a 
number of Tax Exempt Money Market shares equal in value to the value of the 
net assets of California Tax Exempt Money Market Fund and New York Tax Exempt 
Money Market Fund transferred to Tax Exempt Money Market Fund. 

Fund 
performance 
supplement 

Putnam Tax Exempt Money Market Fund is a portfolio managed for current income 
free from federal income taxes, consistent with capital preservation, stable 
principal and liquidity by investing primarily in a diversified portfolio of 
short-term tax-exempt securities. 

The Lipper Tax Exempt Money Market Fund Average, used for performance 
comparison purposes, is an arithmetic average of the total return of all the 
tax exempt money market mutual funds tracked by the Lipper Analytical 
Services. Lipper is an independent rating organization for the mutual fund 
industry. Lipper rankings vary for other periods. The fund's holdings do not 
match those in the Lipper Average. 

The Consumer Price Index is a commonly used measure of inflation; it does not 
represent an investment return. 

The fund performance supplement has been prepared by Putnam Management to 
provide additional information about the fund and the indexes used for 
performance comparisons. The information is not part of the portfolio of 
investments owned or the financial statements. 

<PAGE>

Putnam 
Tax-Exempt 
Money Market 
Fund 

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 

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

Custodian 
Putnam Fiduciary 
Trust Company 

Legal Counsel 
Ropes & Gray 

(Dalbar Logo)
Putnam Investor Services 
has received the DALBAR 
award each year since 
the award's 1990 inception. 
In more than 10,000 tests 
of 38 shareholder 
service components, 
Putnam outperformed 
the industry standard 
in every category. 
A25-11893 

<PAGE>

Officers 
George Putnam 
President 

Charles E. Porter 
Executive Vice President 

Patricia C. Flaherty 
Senior Vice President 

Lawrence J. Lasser 
Vice President 

Gordon H. Silver 
Vice President 

James P. Erickson 
Vice President 

Linsey Callen 
Vice President 
and Fund Manager 

William N. Shiebler 
Vice President 

John R. Verani 
Vice President 

Paul O'Neil 
Vice President 

John D. Hughes 
Vice President 
and Treasurer 

Beverly Marcus 
Clerk and 
Assistant Treasurer 

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, 
A.J.C. Smith, W. Nicholas Thorndike 

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

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

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

<PAGE>

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

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

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

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

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

(5)  Page numbering is omitted.

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








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