DREYFUS ONE HUNDRED PERCENT US TREASURY MONEY MARKET FUND
N-30D, 1999-09-01
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Dreyfus

100% U.S. Treasury

Money Market Fund

SEMIANNUAL REPORT June 30, 1999

(reg.tm)



<PAGE>

The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

   * Not FDIC-Insured  * Not Bank-Guaranteed  * May Lose Value

Year 2000 Issues (Unaudited)

The fund could be adversely affected if the computer systems used by The Dreyfus
Corporation and the fund's other service providers do not properly process and
calculate date-related information from and after January 1, 2000. The Dreyfus
Corporation is working to avoid Year 2000-related problems in its systems and to
obtain assurances from other service providers that they are taking similar
steps. In addition, issuers of securities in which the fund invests may be
adversely affected by Year 2000-related problems. This could have an impact on
the value of the fund's investments and its share price.



<PAGE>

                                 Contents

                                 THE FUND
- --------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                             7   Statement of Assets and Liabilities

                             8   Statement of Operations

                             9   Statement of Changes in Net Assets

                            10   Financial Highlights

                            11   Notes to Financial Statements

                                 FOR MORE INFORMATION
- ---------------------------------------------------------------------------

                                 Back Cover

<PAGE>


                                                                       The Fund

                                                     Dreyfus 100% U.S. Treasury

                                                              Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are pleased to present this semiannual report for Dreyfus 100% U.S. Treasury
Money  Market  Fund,  covering the six-month period from January 1, 1999 through
June  30,  1999. Inside, you'll find valuable information about how the fund was
managed during the period, including a discussion with senior portfolio manager,
Patricia A. Larkin.

After  remaining  relatively  steady during the first quarter of 1999, yields on
money  market  securities  generally  rose  in the second quarter in response to
expectations  that  the  Federal  Reserve  Board would raise short-term interest
rates  at  their June meeting. On June 30, the Federal Reserve raised rates amid
stronger-than-expected  global and domestic economic growth. Their objective was
to forestall a potential resurgence of inflationary pressures.

We  appreciate  your confidence over the past six months, and we look forward to
your  continued  participation  in Dreyfus 100% U.S. Treasury Money Market Fund

Sincerely,


Stephen E. Canter

President and Chief Investment Officer

The Dreyfus Corporation

July 15, 1999





<PAGE 2>

DISCUSSION OF FUND PERFORMANCE

Patricia A. Larkin, Senior Portfolio Manager

How did Dreyfus 100% U.S. Treasury Money Market Fund  perform during the period

For  the  six-month period ended June 30, 1999, Dreyfus 100% U.S. Treasury Money
Market Fund produced an annualized yield of 4.01% which, taking into account the
effect  of  compounding,  the  annualized effective yield was 4.09%.(1) The fund
provided  a  total return of 2.04%(2) compared to the Lipper U.S. Treasury Money
Market Funds category average total return of 2.00% for the same period.(3)

We  attribute the fund's yield to the fact that we owned longer-term securities,
while  maintaining  an average dollar-weighted fund maturity of 90 days or less,
which  enabled us to lock in higher returns in an environment characterized, for
all but the end of the period, by declining or stable interest rates.

What is the fund's investment approach?

There  are many factors we consider in managing the fund. We closely monitor the
outlook  for  growth  and  inflation.  We  follow  overseas developments for any
influence  they  may  have  on  the domestic economy. The posture of the Federal
Reserve  Board  (the  "Fed") is a key determinant in our decision on how best to
structure the fund.

In  addition,  we actively manage the average maturity of the fund in an attempt
to  take  advantage  of  expected  interest rate changes based upon our economic
outlook.  If  we  believe  that  interest rates will fall, we typically lengthen
average maturity to lock in the then-current rates. Conversely, in a rising rate
environment,  we  typically  shorten  maturities  to  be  able  to  reinvest  at
anticipated higher rates in the future.

                                                             The Fund



<PAGE 3>

DISCUSSION OF FUND PERFORMANCE (CONTINUED)

As  a  money  market fund, the fund only buys securities rated in one of the two
highest rating categories for debt obligations, or of comparable credit quality.
The  fund must also maintain an average dollar-weighted fund maturity of 90 days
or  less  and  may buy only securities with remaining maturities of 13 months or
less.

What other factors influenced the fund's performance?

Last fall, in the wake of Asian market turmoil, the Open Market Committee of the
Fed cut short-term interest rates three times in an attempt to provide liquidity
and  improve  investor  confidence.  Since  then,  there have been concerns that
global  and  domestic  factors  might  push  the  United  States economy towards
unsustainable growth.

As of June 30, 1999, Asian economies appear to have stabilized. What's more, the
outlook  for  growth in the major industrialized nations has been improving. The
domestic  economy continued to move ahead briskly, evidenced by a strong rebound
in   manufacturing  output  that  shows  signs  of  gaining  momentum.  Consumer
confidence  was  at  a  30-year  high.  Employment was strong, with hourly wages
rising.  Despite  concerns  that  overly  rapid  economic  growth  might lead to
destructive  inflationary  pressure,  the Fed held interest rates steady through
all  but the very end of the period. Because we managed the fund at a relatively
longer  average  maturity, investors have been able to benefit from stable rates
and the Fed's long held accommodative stance during the reporting period.

What is the fund's current strategy?

Throughout  the  reporting period, as the economy showed robust growth, bond and
money  markets  anticipated  a  tightening  of  monetary policy by the Fed. Such
tightening  was  signaled by Chairman Alan Greenspan's mid-May announcement of a
shift  in policy towards a bias to increase rates. The bias changed in fact just
prior    to    the    end    of    the


<PAGE 4>


reporting  period,  when  the  Fed  raised  the  target  Federal  Funds rates by
one-quarter  point  to  five  percent  with  an accompanying return to a neutral
stance  on  future Federal Funds rate movement. An initial relief rally has been
replaced by a cautious "wait and see" market view.

Over  the  reporting  period, the fund benefited from our commitment to a longer
maturity  structure.  When  rates  did  not rise as quickly as markets expected,
longer  maturities  enhanced  return. However, over the past few months, we have
taken a somewhat less aggressive stance, slowly reducing the average maturity of
our  investments.  In  an  uncertain  market  with  the  potential  for  further
tightening,  we have adopted this approach, while still seeking opportunities to
capture additional yield as such opportunities arise.

July 15, 1999

(1)  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE. AN INVESTMENT IN THE FUND IS NOT INSURED OR GUARANTEED BY THE FDIC OR
ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF
YOUR INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN
THE FUND.

(2)  TOTAL RETURN INCLUDES REINVESTMENT OF DIVIDENDS.

(3)  SOURCE: LIPPER ANALYTICAL SERVICES, INC.

                                                             The Fund

<PAGE 5>
<TABLE>
<CAPTION>
STATEMENT OF INVESTMENTS

June 30, 1999 (Unaudited)

                                                                         Annualized
                                                                          Yield on
                                                                       Date of  Principal

U.S. TREASURY BILLS--7.5%                                                Purchase (%)            Amount ($)            Value ($)
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                      <C>                   <C>
7/22/1999                                                                        5.31             8,701,000            8,675,369

8/12/1999                                                                        4.55             7,331,000            7,292,427

8/26/1999                                                                        4.56             7,903,000            7,847,556

9/23/1999                                                                        4.69             1,775,000            1,755,788

12/9/1999                                                                        4.78             5,821,000            5,700,850

1/6/2000                                                                         4.48            14,763,000           14,429,843

2/3/2000                                                                         4.80             3,495,000            3,398,407

3/2/2000                                                                         4.69            13,818,000           13,396,216

3/30/2000                                                                        4.62             6,062,000            5,859,131

4/27/2000                                                                        4.75            13,589,000           13,072,802

5/25/2000                                                                        5.06             2,734,000            2,613,551

TOTAL U.S. TREASURY  BILLS
  (cost $84,041,940)                                                                                                  84,041,940
- -------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY NOTES--89.8%
- --------------------------------------------------------------------------------

6.375%, 7/15/1999                                                                4.64           100,000,000          100,061,390

5.50%, 7/31/1999                                                                 4.47           360,000,000          360,368,251

5.00%, 8/15/1999                                                                 4.66            28,315,000           28,358,854

8.875%, 8/15/1999                                                                4.57           125,000,000          125,508,250

5.875%, 8/31/1999                                                                4.63            72,605,000           72,734,277

6.25%, 9/30/1999                                                                 4.73           108,188,000          108,423,511

6.375%, 9/30/1999                                                                4.48            11,165,000           11,231,694

6.50%, 10/15/1999                                                                4.58             8,032,000            8,061,606

6.25%, 10/31/1999                                                                4.52            21,289,000           21,352,081

6.375%, 11/30/1999                                                               5.02            75,000,000           75,799,428

5.875%, 3/31/2000                                                                4.80            50,000,000           50,710,618

6.00%, 4/15/2000                                                                 4.67            25,000,000           25,117,905

6.00%, 6/30/2000                                                                 5.15            20,000,000           20,012,070

TOTAL U.S. TREASURY NOTES
  (cost $1,007,739,935)                                                                                            1,007,739,935
- --------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $1,091,781,875)                                         97.3%                              1,091,781,875

CASH AND RECEIVABLES ( NET)                                                      2.7%                                 30,223,522

NET ASSETS                                                                     100.0%                              1,122,005,397

SEE NOTES TO FINANCIAL STATEMENTS.

</TABLE>


<PAGE 6>
<TABLE>
<CAPTION>
STATEMENT OF ASSETS AND LIABILITIES

June 30, 1999 (Unaudited)

                                                    Cost           Value
- --------------------------------------------------------------------------------
<S>                                                 <C>            <C>
ASSETS ($):

Investments in securities--See Statement of
Investments                                         1,091,781,875  1,091,781,87

Cash                                                                  9,422,235

Interest receivable                                                  21,202,278

Prepaid expenses and other assets                                       131,755

                                                                  1,122,538,143
- --------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                           433,002

Accrued expenses                                                         99,744

                                                                        532,746
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                    1,122,005,397
- --------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                   1,122,399,100

Accumulated net realized gain (loss) on investments                   (393,703)
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                    1,122,005,397
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of

  Beneficial Interest authorized)                                 1,122,110,326

NET ASSET VALUE, offering and redemption price per share ($)               1.00

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

<PAGE 7>
<TABLE>
<CAPTION>
STATEMENT OF OPERATIONS

Six Months Ended June 30, 1999 (Unaudited)


- --------------------------------------------------------------------------------
<S>                                                                <C>
INVESTMENT INCOME ($):

INTEREST INCOME                                                     25,811,491

EXPENSES:

Management fee--Note 2(a)                                            2,754,750

Shareholder servicing costs--Note 2(b)                                 760,895

Custodian fees                                                          42,151

Trustees' fees and expenses--Note 2(c)                                  41,285

Registration fees                                                       36,300

Professional fees                                                       24,194

Prospectus and shareholders' reports                                    17,670

Miscellaneous                                                              908

TOTAL EXPENSES                                                       3,678,153

INVESTMENT INCOME--NET                                              22,133,338
- --------------------------------------------------------------------------------

NET REALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 1(B) ($):               (47,726)

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                22,085,612

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



<PAGE 8>
<TABLE>
<CAPTION>

STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                            June 30, 1999         Year Ended
                                              (Unaudited)         December 31, 1998
- --------------------------------------------------------------------------------
<S>                                         <C>                   <C>
OPERATIONS ($):

Investment income--net                         22,133,338           49,685,105

Net realized gain (loss) on investments          (47,726)            (153,399)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                  22,085,612           49,531,706
- --------------------------------------------------------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                       (22,133,338)         (49,685,105)
- --------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

Net proceeds from shares sold                 557,976,617        1,045,848,980

Dividends reinvested                           21,096,477           47,140,240

Cost of shares redeemed                     (599,602,820)      (1,154,200,701)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS          (20,529,726)         (61,211,481)

TOTAL INCREASE (DECREASE) IN NET ASSETS      (20,577,452)         (61,364,880)
- ------------------------------------------------------------------------------------------------------------------------------

NET ASSETS:

Beginning of Period                         1,142,582,849        1,203,947,729

END OF PERIOD                               1,122,005,397        1,142,582,849

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund

<PAGE 9>
<TABLE>
<CAPTION>
FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
Total  return  shows  how  much your investment in the fund would have increased
(or decreased) during each period, assuming you had reinvested all dividends and
distributions.  These  figures  have  been  derived  from  the  fund's financial
statements.

                                             Six Months Ended
                                              June 30, 1999                           Year Ended December 31,
                                                                          --------------------------------------------

                                                (Unaudited)       1998            1997          1996           1995          1994
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>               <C>             <C>           <C>           <C>            <C>
PER SHARE DATA ($):

Net asset value,
   beginning of period                                1.00          1.00          1.00           1.00          1.00         1.00

Investment Operations:

Investment income--net                                .020          .045          .046           .046          .051         .033

Distributions:

Dividends from investment
   income--net                                       (.020)        (.045)        (.046)         (.046)        (.051)       (.033)

Net asset value, end of period                        1.00          1.00          1.00           1.00          1.00          1.00
- ---------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                      4.05((+))     4.55          4.74           4.67          5.19          3.38
- --------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                 .71((+))       .75           .71           .71            .69           .71

Ratio of net investment income
   to average net assets                             4.02((+))      4.46           4.64         4.55           5.09          3.29
- ---------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($ x 1,000)                                     1,122,005    1,142,583      1,203,948    1,286,854      1,310,691    1,450,739

((+))  ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



<PAGE 10>


NOTES TO FINANCIAL STATEMENTS

NOTE 1--Significant Accounting Policies:

Dreyfus  100%  U.S.  Treasury Money Market Fund (the "fund") is registered under
the  Investment  Company  Act  of 1940, as amended (the "Act"), as a diversified
open-end  management  investment  company. The fund's investment objective is to
provide  investors  with as high a level of current income as is consistent with
the  preservation  of  capital  and the maintenance of liquidity by investing in
obligations  of the U.S. Treasury that provide interest income exempt from state
and  local  income  taxes. The Dreyfus Corporation (the "Manager") serves as the
fund' s  investment  adviser. The Manager is a direct subsidiary of Mellon Bank,
N.A. Premier Mutual Fund Services, Inc. is the distributor of the fund's shares,
which are sold to the public without a sales charge.

It  is  the  fund's policy to maintain a continuous net asset value per share of
$1.00; the fund has adopted certain investment, portfolio valuation and dividend
and distribution policies to enable it to do so. There is no assurance, however,
that  the  fund  will  be able to maintain a stable net asset value per share of
$1.00.

The  fund' s  financial  statements  are  prepared  in accordance with generally
accepted accounting principles which may require the use of management estimates
and   assumptions.   Actual   results   could   differ  from  those  estimates.

(a) Portfolio valuation: Investments in securities are valued at amortized cost,
which  has been determined by the fund's Board of Trustees to represent the fair
value of the fund's investments.

(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade  date  basis.  Realized  gain  and  loss  from securities
transactions  are  recorded  on  the  identified  cost basis. Interest income is
recognized  on the accrual basis. Cost of investments represents amortized cost.
Under the terms of the custody agreement, the fund received net earnings credits
of $6,221 during the period ended June 30, 1999 based on available cash balances
left  on  deposit.  Income earned under this arrangement is included in interest
income.

                                                             The Fund

<PAGE 11>


NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

(c) Dividends to shareholders: It is the policy of the fund to declare dividends
daily  from  investment  income-net.  Such dividends are paid monthly. Dividends
from net realized capital gain, if any, are normally declared and paid annually,
but  the fund may make distributions on a more frequent basis to comply with the
distribution  requirements of the Internal Revenue Code of 1986, as amended (the
" Code" ). To  the  extent  that  the net realized capital gain can be offset by
capital  loss  carryovers,  it  is the policy of the fund not to distribute such
gain.

(d) Federal income taxes: It is the policy of the fund to continue to qualify as
a  regulated  investment company, if such qualification is in the best interests
of  its  shareholders,  by complying with the applicable provisions of the Code,
and  to  make  distributions  of  taxable  income  sufficient to relieve it from
substantially all Federal income and  excise taxes.

The  fund  has  an  unused  capital  loss  carryover  of  approximately $264,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent  to  December 31, 1999. The
carryover  does not include net realized securities losses from November 1, 1998
through December 31, 1998 which are treated for Federal tax purposes, as arising
in fiscal 1999. If not applied, $13,000 of the carryover expires in fiscal 2003,
$153,000  expires  in  fiscal  2004,  $23,000 expires in fiscal 2005 and $75,000
expires in fiscal 2006.

At  June  30,  1999, the cost of investments for Federal income tax purposes was
substantially  the  same  as  the cost for financial reporting purposes (see the
Statement    of    Investments)   .


<PAGE 12>


NOTE 2--Management Fee and Other Transactions  With Affiliates:

(a)  Pursuant  to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .50 of 1% of the value of the fund's average
daily net assets and is payable monthly.

(b)  Under  the  Shareholder  Services Plan, the fund reimburses Dreyfus Service
Corporation,  a  wholly-owned subsidiary of the Manager, an amount not to exceed
an  annual rate of .25 of 1% of the value of the fund's average daily net assets
for certain allocated expenses of providing personal services and/or maintaining
shareholder  accounts.  The  services  provided  may  include  personal services
relating  to  shareholder  accounts,  such  as  answering  shareholder inquiries
regarding  the  fund  and  providing reports and other information, and services
related to the maintenance of shareholder accounts. During the period ended June
30,  1999,  the  fund  was charged $716,986 pursuant to the Shareholder Services
Plan.

The  fund  compensates  Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to  perform transfer agency services for the fund. During the period
ended  June  30,  1999,  the  fund was charged $204,351 pursuant to the transfer
agency agreement.

(c)  Each  trustee  who  is  not  an  "affiliated  person" as defined in the Act
receives from the fund an annual fee of $4,500 and an attendance fee of $500 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation and the Trustee Emeritus receives 50% of such compensation.

                                                             The Fund

<PAGE 13>


                                                           For More Information

                        Dreyfus

                        100% U.S. Treasury Money Market Fund

                        200 Park Avenue

                        New York, NY 10166

                        Manager

                        The Dreyfus Corporation

                        200 Park Avenue

                        New York, NY 10166

Custodian

The Bank of New York

200 Park Avenue

                        New York, NY 10286

Transfer Agent &

Dividend Disbursing Agent

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02940

Distributor

Premier Mutual Fund Services, Inc.

60 State Street

Boston, MA 02109

To obtain information:

BY TELEPHONE Call 1-800-645-6561

BY MAIL Write to:  The Dreyfus Family of Funds 144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL Send your request to [email protected]

ON THE INTERNET Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 1999 Dreyfus Service Corporation                                  071SA996



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