<Page>

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

(Mark One)

(X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2003
                               -------------

                                       OR

( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
    EXCHANGE ACT OF 1934

For the transition period from                to
                              ----------------  ----------------

Commission File Number  0-25000

                          ML PRINCIPAL PROTECTION L.P.
                          ----------------------------
                          (Exact Name of Registrant as
                            specified in its charter)

            Delaware                                13-3750642 (Registrant)
- -------------------------------                     -----------------------
(State or other jurisdiction of                (IRS Employer Identification No.)
 incorporation or organization)

                    c/o Merrill Lynch Investment Managers LLC
                                  222 Broadway
                                   27th Floor
                             New York, NY 10038-2510
                             -----------------------
                    (Address of principal executive offices)
                                   (Zip Code)

                                  609-282-6996
                                 --------------
              (Registrant's telephone number, including area code)

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X   No
                                             ---    ---
<Page>

                         PART I - FINANCIAL INFORMATION

Item 1.  Financial Statements

                          ML PRINCIPAL PROTECTION L.P.
                        (a Delaware Limited Partnership)

                        STATEMENTS OF FINANCIAL CONDITION

<Table>
<Caption>
                                                       JUNE 30,      DECEMBER 31,
                                                         2003            2002
                                                     (UNAUDITED)
                                                   --------------   --------------
                                                              
ASSETS
Equity in commodity futures trading accounts:
  Cash                                             $      550,965   $    1,960,792
Investment in MM LLC                                   16,866,636       16,280,408
Accrued interest receivable                                   448            2,028
                                                   --------------   --------------
                TOTAL                              $   17,418,049   $   18,243,228
                                                   ==============   ==============

LIABILITIES AND PARTNERS' CAPITAL

LIABILITIES:
  Redemptions payable                              $      423,020   $      497,074
  Payable to MM LLC                                       110,625          305,592
                                                   --------------   --------------
            Total liabilities                             533,645          802,666
                                                   --------------   --------------

PARTNERS' CAPITAL:
 General Partners (156,638 and 1,584 Units)               195,629          185,021
 Limited Partners (13,283,447 and 147,723 Units)       16,688,775       17,255,541
                                                   --------------   --------------
            Total partners' capital                    16,884,404       17,440,562
                                                   --------------   --------------
                TOTAL                              $   17,418,049   $   18,243,228
                                                   ==============   ==============
</Table>

NET ASSET VALUE PER UNIT (NOTE 3)

See notes to financial statements.

                                       2
<Page>

                          ML PRINCIPAL PROTECTION L.P.
                        (a Delaware Limited Partnership)

                            STATEMENTS OF OPERATIONS
                                   (unaudited)

<Table>
<Caption>
                                                  FOR THE THREE    FOR THE THREE     FOR THE SIX       FOR THE SIX
                                                   MONTHS ENDED     MONTHS ENDED    MONTHS ENDED      MONTHS ENDED
                                                     JUNE 30,         JUNE 30,        JUNE 30,          JUNE 30,
                                                       2003             2002            2003              2002
                                                 --------------   --------------   --------------    --------------
                                                                                         
REVENUES:
    Trading profits (loss):
        Realized                                 $      925,557   $      471,040   $    2,473,057    $       75,178
        Change in unrealized                            151,801          324,397         (704,826)          308,828
                                                 --------------   --------------   --------------    --------------
            Total trading results                     1,077,358          795,437        1,768,231           384,006
                                                 --------------   --------------   --------------    --------------
    Interest income                                      49,311           99,868          102,379           200,681
                                                 --------------   --------------   --------------    --------------
            Total revenues                            1,126,669          895,305        1,870,610           584,687
                                                 --------------   --------------   --------------    --------------
EXPENSES:
    Brokerage commissions                               309,891          276,592          611,043           562,690
    Administrative fees                                  10,640            9,219           20,991            18,756
    Profit shares                                       127,631           69,372          230,743            69,708
                                                 --------------   --------------   --------------    --------------
            Total expenses                              448,162          355,183          862,777           651,154
                                                 --------------   --------------   --------------    --------------
NET INCOME (LOSS)                                $      678,507   $      540,122   $    1,007,833    $      (66,467)
                                                 ==============   ==============   ==============    ==============
NET INCOME (LOSS) PER UNIT:
    Weighted average number of General Partner
        and Limited Partner units outstanding        13,872,504          178,080       14,265,980           182,169
                                                 ==============   ==============   ==============    ==============
    Net income (loss) per weighted
    average Limited Partner and
    General Partner Unit                         $        .0489   $         3.03   $        .0706    $        (0.36)
                                                 ==============   ==============   ==============    ==============
</Table>

See notes to financial statements.

Certain 2002 information has been changed to conform to the 2003 presentation.

                                       3
<Page>

                          ML PRINCIPAL PROTECTION L.P.
                        (a Delaware Limited Partnership)

                   STATEMENTS OF CHANGES IN PARTNERS' CAPITAL
                FOR THE SIX MONTHS ENDED JUNE 30, 2003 AND 2002
                                   (unaudited)

<Table>
<Caption>
                                             GENERAL          LIMITED
                            UNITS            PARTNER          PARTNERS            TOTAL
                       --------------    --------------    --------------    --------------
                                                                 
PARTNERS' CAPITAL,
  December 31, 2001           191,545    $      233,900    $   21,071,380    $   21,305,280

Net loss                           --              (179)          (66,288)          (66,467)

Redemptions                   (20,106)               --        (2,179,047)       (2,179,047)

Distributions                      --            (1,054)          (90,321)          (91,375)
                       --------------    --------------    --------------    --------------

PARTNERS' CAPITAL,
  June 30, 2002               171,439    $      232,667    $   18,735,724    $   18,968,391
                       ==============    ==============    ==============    ==============

PARTNERS' CAPITAL,
  December 31, 2002           149,307    $      185,021    $   17,255,541    $   17,440,562

Conversion of shares       14,633,051                59             5,440             5,499

Net income                         --            11,012           996,821         1,007,833

Redemptions                (1,342,273)               --        (1,524,972)       (1,524,972)

Distributions                      --              (463)          (44,055)          (44,518)
                       --------------    --------------    --------------    --------------

PARTNERS' CAPITAL,
  June 30, 2003            13,440,085    $      195,629    $   16,688,775    $   16,884,404
                       ==============    ==============    ==============    ==============
</Table>

See notes to financial statements.

                                       4
<Page>

                          ML PRINCIPAL PROTECTION L.P.
                        (a Delaware Limited Partnership)

                          NOTES TO FINANCIAL STATEMENTS
                                   (unaudited)


1.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     These financial statements have been prepared without audit. In the opinion
     of management, the financial statements contain all adjustments (consisting
     of only normal recurring adjustments) necessary to present fairly the
     financial position of ML Principal Protection L.P. (the "Partnership") as
     of June 30, 2003, and the results of its operations for the three and six
     months ended June 30, 2003 and 2002. However, the operating results for the
     interim periods may not be indicative of the results for the full year.

     Certain information and footnote disclosures normally included in annual
     financial statements prepared in conformity with accounting principles
     generally accepted in the United States have been omitted. It is suggested
     that these financial statements be read in conjunction with the financial
     statements and notes thereto included in the Partnership's Annual Report on
     Form 10-K filed with the Securities and Exchange Commission for the year
     ended December 31, 2002.

2.   INVESTMENTS

     As of June 30, 2003 and December 31, 2002, the Partnership had an
     investment in ML Multi-Manager Portfolio LLC ("MM LLC") of $16,866,636 and
     $16,280,408, respectively. As of June 30, 2003, and December 31, 2002, the
     Partnership's percentage ownership share of MM LLC was 10.73% and 9.39%,
     respectively.

     A condensed statements of financial condition and statements of operations
     for MM LLC are set forth as follows:

<Table>
<Caption>
                                    JUNE 30,             DECEMBER 31,
                                      2003                   2002
                                  (UNAUDITED)
                             --------------------   --------------------
                                              
     Assets                  $        160,592,732   $        177,485,585
                             ====================   ====================

     Liabilities             $          3,434,981   $          4,031,107
     Members' Capital                 157,157,751            173,454,478
                             --------------------   --------------------

     Total                   $        160,592,732   $        177,485,585
                             ====================   ====================

<Caption>

                             FOR THE THREE MONTHS   FOR THE THREE MONTHS     FOR THE SIX MONTHS     FOR THE SIX MONTHS
                              ENDED JUNE 30, 2003    ENDED JUNE 30, 2002    ENDED JUNE 30, 2003    ENDED JUNE 30, 2002
                                  (UNAUDITED)            (UNAUDITED)            (UNAUDITED)            (UNAUDITED)
                             --------------------   --------------------   --------------------   --------------------
                                                                                      
     Revenues                $          5,969,103   $          5,972,065   $         10,541,402   $          4,058,377

     Expenses                           2,459,957              2,807,537              5,054,477              4,959,006
                             --------------------   --------------------   --------------------   --------------------

     Net Income (Loss)       $          3,509,146   $          3,164,528   $          5,486,925   $           (900,629)
                             ====================   ====================   ====================   ====================
</Table>

                                       5
<Page>

3.   NET ASSET VALUE PER UNIT

     Prior to the opening of business on January 2, 2003, Series A through F and
     K through N, those series whose guarantee had come to term on or before
     December 31, 2002, were consolidated into a new series, Series A 2003, with
     a $1.00 per Unit Net Asset Value. The aggregate Net Asset Value of each
     investor's new Units is equal to the aggregate Net Asset Value of their
     original Units at December 31, 2002. The consolidation had no economic
     effect on the investors. The General Partner contributed $5,499 to the
     Partnership, the amount necessary due to the effects of rounding, to insure
     all investors received Units equal in value to their original holdings at
     December 31, 2002. The following is a listing of the number of new Units
     each investor received of Series A 2003 for each Unit of their original
     series holding.

<Table>
<Caption>
                     NUMBER
       SERIES       OF UNITS
       ------       --------
               
     A            122.021960
     B            117.269077
     C            115.242141
     D            112.085339
     E            111.088709
     F            104.084994
     K            123.799970
     L            120.674078
     M            122.310644
     N            117.973383
</Table>

     After the series consolidation, the brokerage commission rate for Series A
     2003 was reduced to a monthly rate of 0.604 of 1% (a 7.25% annual rate).

     At June 30, 2003 and December 31, 2002, the Net Asset Values of the
     different series of Units were:

     June 30, 2003
     (unaudited)

<Table>
<Caption>
                                                                  NET ASSET VALUE
                            NET ASSET VALUE    NUMBER OF UNITS       PER UNIT
                           ----------------   ----------------   ----------------
                                                        
     Series A 2003 Units   $     14,249,417    13,417,198.0000   $         1.0620
     Series G Units                 496,112         4,638.0300   $         106.97
     Series H Units                 519,265         5,076.6650   $         102.28
     Series O Units                 663,222         5,288.7419   $         125.40
     Series P Units                 242,979         1,899.0000   $         127.95
     Series Q Units                 195,525         1,653.2408   $         118.27
     Series R Units                 460,675         3,856.0000   $         119.47
     Series S Units                  57,209           475.0000   $         120.44
                           ----------------   ----------------
                           $     16,884,404    13,440,084.6777
                           ================   ================
</Table>

                                       6
<Page>

     December 31, 2002

<Table>
<Caption>
                                                                  NET ASSET VALUE
                            NET ASSET VALUE    NUMBER OF UNITS       PER UNIT
                           ----------------   ----------------   ----------------
                                                        
     Series A Units        $      4,554,926        37,329.0000   $         122.02
     Series B Units                 361,036         3,079.0000   $         117.26
     Series C Units                 754,685         6,550.0000   $         115.22
     Series D Units               2,324,762        20,741.0000   $         112.09
     Series E Units               1,327,640        11,951.4800   $         111.09
     Series F Units                 829,625         7,711.3400   $         107.58
     Series G Units                 585,224         5,508.0300   $         106.25
     Series H Units                 547,940         5,390.6650   $         101.65
     Series K Units               2,302,631        18,619.0000   $         123.67
     Series L Units               1,390,508        11,536.2800   $         120.53
     Series M Units                 726,816         5,946.4607   $         122.23
     Series N Units                 207,135         1,757.6778   $         117.85
     Series O Units                 624,977         5,288.7419   $         118.17
     Series P Units                 228,921         1,899.0000   $         120.55
     Series Q Units                 185,883         1,667.9408   $         111.44
     Series R Units                 433,969         3,856.0000   $         112.54
     Series S Units                  53,884           475.0000   $         113.44
                           ----------------   ----------------
                           $     17,440,562       149,306.6162
                           ================   ================
</Table>

4.   ANNUAL DISTRIBUTIONS

     The Partnership makes annual fixed-rate distributions, payable irrespective
     of profitability, of $3.50 per Unit on Units issued prior to May 1, 1997.
     The Partnership may also pay discretionary distributions on such Series of
     Units of up to 50% of any Distributable New Appreciation, as defined on
     such Units. No distributions are payable on Units issued after May 1, 1997.
     As of June 30, 2003, the Partnership has made the following distributions:

<Table>
<Caption>
                           DISTRIBUTION        FIXED-RATE      DISCRETIONARY
            SERIES             DATE           DISTRIBUTION      DISTRIBUTION
          ----------       ------------       ------------     -------------
                                                          
     2003
     ----
          Series F             1/1/2003          $    3.50         $    -
          Series G             4/1/2003               3.50              -

     2002
     ----
          Series B             1/1/2002          $    3.50         $    -
          Series C             4/1/2002               3.50              -
          Series D             7/1/2002               3.50              -
          Series E            10/1/2002               3.50              -
          Series F             1/1/2002               3.50              -
          Series G             4/1/2002               3.50              -
          Series H             7/1/2002               3.50              -
</Table>

                                       7
<Page>

5.   FAIR VALUE AND OFF-BALANCE SHEET RISK

     The nature of this Partnership has certain risks, which can not be
     presented on the financial statements. The following summarizes some of
     those risks.

     MARKET RISK

     Derivative instruments involve varying degrees of off-balance sheet market
     risk. Changes in the level or volatility of interest rates, foreign
     currency exchange rates or the market values of the financial instruments
     or commodities underlying such derivative instruments frequently result in
     changes in the Partnership's net unrealized profit (loss) on such
     derivative instruments as reflected in the Statements of Financial
     Condition or, with respect to Partnership assets invested in MM LLC, the
     net unrealized profit (loss) as reflected in the respective Statements of
     Financial Condition of MM LLC. The Partnership's exposure to market risk is
     influenced by a number of factors, including the relationships among the
     derivative instruments held by the Partnership and MM LLC as well as the
     volatility and liquidity of the markets in which such derivative
     instruments are traded.

     The General Partner, Merrill Lynch Investment Managers LLC ("MLIM LLC"),
     has procedures in place intended to control market risk exposure, although
     there can be no assurance that they will, in fact, succeed in doing so.
     These procedures focus primarily on monitoring the trading of the Advisors
     selected from time to time by the Partnership or MM LLC, and include
     calculating the Net Asset Value of their respective Partnership accounts
     and MM LLC accounts as of the close of business on each day and reviewing
     outstanding positions for over-concentrations both on an Advisor-by-Advisor
     and on an overall Partnership basis. While MLIM LLC does not itself
     intervene in the markets to hedge or diversify the Partnership's market
     exposure, MLIM LLC may urge Advisors to reallocate positions, or itself
     reallocate Partnership assets, through MM LLC, among Advisors (although
     typically only as of the end of a month) in an attempt to avoid
     over-concentrations. However, such interventions are unusual. Except in
     cases in which it appears that an Advisor has begun to deviate from past
     practice or trading policies or to be trading erratically, MLIM LLC's basic
     risk control procedures consist simply of the ongoing process of advisor
     monitoring and selection with the market risk controls being applied by the
     Advisors themselves.

     CREDIT RISK

     The risks associated with exchange-traded contracts are typically perceived
     to be less than those associated with over-the-counter
     (non-exchange-traded) transactions, because exchanges typically (but not
     universally) provide clearinghouse arrangements in which the collective
     credit (in some cases limited in amount, in some cases not) of the members
     of the exchange is pledged to support the financial integrity of the
     exchange. In over-the-counter transactions, on the other hand, traders must
     rely solely on the credit of their respective individual counterparties.
     Margins, which may be subject to loss in the event of a default, are
     generally required in exchange trading, and counterparties may require
     margin in the over-the-counter markets.

     The Partnership, through MM LLC, has credit risk in respect of its
     counterparties and brokers, but attempts to mitigate this risk by dealing
     exclusively with Merrill Lynch entities as clearing brokers.

     The Partnership, through MM LLC, in its normal course of business, enters
     into various contracts, with Merrill Lynch, Pierce, Fenner & Smith
     ("MLPF&S") acting as its commodity broker. Pursuant to the brokerage
     agreement with MLPF&S (which includes a netting arrangement), to the extent
     that such trading results in receivables from and payables to MLPF&S, these
     receivables and payables are

                                       8
<Page>

     offset and reported as a net receivable or payable in the financial
     statements of MM LLC in the Equity in commodity futures trading accounts in
     the Statements of Financial Condition.

Item 2: MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

<Table>
<Caption>
                   MONTH-END NET ASSET VALUE PER SERIES A UNIT
- --------------------------------------------------------------------------------
             JAN.        FEB.        MAR.        APR.        MAY         JUN.
- --------------------------------------------------------------------------------
                                                    
   2002   $109.41(a)  $106.60(a)  $108.32(a)  $106.88(a)  $108.25(a)  $112.26(a)
- --------------------------------------------------------------------------------
   2003   $1.0331(b)  $1.0654(b)  $1.0196(b)  $1.0262(b)  $1.0790(b)  $1.0620(b)
- --------------------------------------------------------------------------------
</Table>

(a) After reduction of $29.50 per Series A Unit distributions from inception to
date.

(b) After series consolidation on January 1, 2003.

Performance Summary

All of the Partnership's trading assets are invested in MM LLC. The Partnership
recognizes trading profits or losses as an investor in MM LLC. The following
commentary describes the trading results of MM LLC.

JANUARY 1, 2003 TO JUNE 30, 2003

January 1, 2003 to March 31, 2003

The Partnership experienced gains in the currency, energy, interest rate and
stock index sectors and losses in the agricultural commodity and metals sectors.
Overall, for the quarter, the Partnership experienced gains.

The currency forward and futures trading had the most significant gains for the
quarter. The weakening U.S. dollar was continuing to decline as it has for over
a year and the Partnership was well positioned to capitalize on its U.S. dollar
positions against other currencies. The largest gains versus the U.S. dollar
during January and February were with the Australian dollar and Canadian dollar.
In March, on hopes that the war with Iraq would be short, the U.S. dollar
strengthened and returned some of the profits earned early in the year.

Energy was a profitable sector for the quarter. With the continuation of the
strike in Venezuela, the tensions with Iraq and the cold winter, long positions
in oil and natural gas were profitable in the beginning of the year. In
February, the best performing month, natural gas prices rose nearly 40% in a
single day citing expected severely cold weather and supply shortages. The
Partnership profited from this event but such volatility caused many of the
Advisors to reduce their long positions. This helped the Partnership retain
profits as prices declined in crude oil and natural gas in March.

Interest rate futures were also profitable for the quarter. February had
significant gains offsetting losses in both January and March. U.S. and European
bonds rallied amid concerns of a global economic slowdown benefiting the
Partnership's long exposures. Selective long/short rate exposure globally was
the main driver to gains generated in the sector. The global fixed income
markets continued their upward climb until mid-March when expectations of a
short conflict triggered the liquidation of many fixed income investments
hurting long exposures.

                                       9
<Page>

Trading in stock indices posted slight gains for the quarter. The market was
choppy throughout the quarter making trading difficult. The Partnership was able
to realize some gains in January on short positions as most indices recorded
three-month lows. During the rest of the quarter, choppy markets caused short
positions to be covered to protect against the risk of significant losses.

The metals sector had losses for the quarter. Gold drove profits in January as
it continued its run up. The general perception of risks in the financial
markets and the geopolitical situation unfolding was the main driver for the
gold market in January. The Partnership sustained losses in February and March
as the long bias in precious metals hurt the portfolio when gold reversed its
rising trend in February and continued to decline. Gold's appeal as a safe
investment diminished.

Trading in agricultural commodities posted losses for the quarter. The
Partnership held positions in sugar, livestock and the soybean complex.
Livestock markets were off in February as Russia imposed an import limit to help
its domestic production. Sugar was to blame for losses in March as prices
reversed and hit a two-month low.

April 1, 2003 to June 30, 2003

The Partnership was profitable in the financial futures, currencies, interest
rates and stock index sectors, and incurred losses in the physical commodity
sectors, energy, agriculture and metals.

The currency sector was the strongest performer for the Partnership. The U.S.
dollar depreciated against most major currencies throughout most of the second
quarter. The currency markets judged the developments in the Middle East as
negative for the U.S. economy and trade, and the U.S. dollar sold off against
most major currencies. The U.S. dollar continued to weaken significantly during
the month of May when Treasury Secretary Snow indicated he was comfortable with
current declines and that a cheaper U.S. dollar would increase exports. The U.S.
dollar strengthened against most major currencies late June, reversing some
earlier profits.

The interest rate sector generated strong gains during the second quarter
producing significant profits in May. After a mixed start in April, the bond
market rally continued through May despite the stock market recovery. The U.S.,
European and Japanese bond markets reached new highs in June, as investors were
convinced the Federal Reserve would cut short-term rates by 50 basis points. A
stronger Consumer Price Index and a rate cut of only 25 basis points
disappointed the markets causing bond prices to reverse sharply by the end of
the month.

The stock index sector posted gains for the quarter. Gains were generated in
short-term trading in the U.S. and Europe, primarily the S&P 500 and selected
European indices. Overall exposure to the sector remains relatively light.

The energy markets posted losses for the quarter. The markets in April and May
were dominated by the developments in the Middle East, especially OPEC's
reaction to the developments in Iraq. Production was not being resumed as
initially estimated even though the destruction of the oilfields was smaller
than expected. The SARS epidemic was expected to reduce the demand for jet fuel,
which the markets extrapolated to affect crude oil prices. Natural gas was very
volatile during June.

Trading in agricultural commodities had losses for the quarter. Gains in April,
mainly from soybeans, which rallied due to revisions crop estimates and weather
overseas, were overshadowed by losses in May and June due to changes in crop
estimates and a volatile livestock market. Losses were posted in livestock,
oil seed and grains.

                                       10
<Page>

The metals sector generated the greatest losses for the Partnership this
quarter. Short positions in base metals and precious metals contributed to
losses in the sector. Gold generated losses in June reacting to the U.S. dollar
sell off.

JANUARY 1, 2002 TO JUNE 30, 2002

January 1, 2002 to March 31, 2002

The energy sector was the only profitable trading strategy for the quarter.
Natural gas short positions were profitable as the positions benefited from the
mild weather in the United States. The sector experienced large declines in
February due to increased concerns of the health of world economies. This lead
to price instability. Gains were realized in March in the physical commodity
markets, as fears of increased conflicts in the Middle East could potentially
result in a shortage of oil supplies.

Trading in stock indices resulted in losses for the quarter. Long equity
exposures suffered losses in choppy market conditions as profit forecasts fell
short and concern over the Enron accounting situation deepened. Uncertainty in
the global marketplace prevailed, making for extremely difficult trading
conditions. Long positions appreciated in March, notably in Japan, Germany and
France, but not enough to offset earlier losses.

Conflicting economic reports was the cause for losses in the interest rate
sector. These reports prompted the Advisors to flip exposures from long
positions to short positions in most major international bond markets during the
quarter. European fixed income exposures posted losses under particularly
direction-less markets. Global bond prices declined on growing optimism for a
stronger economic outlook for the remainder of 2002.

Trading in the metals sector was down for the quarter. Short positions in base
metals were unsuccessful early on as base metals prices soared on the hope that
an economic recovery in the United States would boost demand. Precious metal
prices declined as the U.S. economy continued to show signs of stabilizing and
inflation concerns waned. Long gold positioning generated gains as prices rose
above $300 for the first time in two years.

Currency trading resulted in losses for the Partnership. In January, gains were
generated in short Japanese yen positions as the Japanese yen continued to
depreciate against the U.S. dollar due to continued deterioration of economic
fundamentals in Japan. In February, all of the futures traded currencies
appreciated against the U.S. dollar, except the Canadian dollar. March was a
relatively volatile month for G-7 currencies. The U.S. dollar fell from 133 to
127.50 Japanese yen during the first week, and then almost completely reversed
the move by month-end, causing losses.

Agricultural trading was the least successful strategy. During January and
February, coffee prices were in a downward trend. This trend sharply reversed in
March as reduced exports from Mexico and Central America trimmed inventories of
exchange-approved soybeans in U.S. warehouses. As prices rose, the Partnership's
short positions sustained losses.

                                       11
<Page>

April 1, 2002 to June 30, 2002

Profits resulting from trading in the currency sector provided the Partnership
with the majority of its gains in the second quarter. The decline in the U.S.
dollar continued through June unabated fueled by the decline in the U.S. equity
markets.

The interest rate sector was profitable for the Partnership despite its slow
start. Yields on major debt-instruments continued to decline. U.S. fixed income
markets have rallied sharply due to the flight-to-safety effect as well as the
conviction that the U.S. Federal Reserve will raise rates later rather than
sooner.

The agricultural commodities sector posted small gains for the quarter. Strong
gains were posted in livestock and grains in April as prices trended downward.
Soybean by-products positions also contributed to the profits in this sector.
The continued weakness in the U.S. dollar and low stockpiles in grains and
soybeans should aid in sustaining a price rally in the summer months.

The metals sector sustained slight losses for the quarter. In June, the uptrend
in gold and silver reversed and losses were sustained on long position
eliminating profits earned earlier in the quarter.

Energy futures experienced whipsaw markets and trading brought in losses for the
Partnership. The market was volatile during the quarter due to continued turmoil
in the Middle East.

Losses were experienced in the stock indices sector. The quarter began with the
stall of the appreciation in the U.S. and European equity markets in April due
to weak recovery expectations. The continued erosion of confidence in the
quarter about corporate earnings and the timing of recovery caused both the U.S.
and European markets to fall back.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

        Not applicable

Item 4. Controls and Procedures

Merrill Lynch Investment Managers LLC, the General Partner of ML Principal
Protection L.P., with the participation of the General Partner's Chief Executive
Officer and the Chief Financial Officer, has evaluated the effectiveness of the
design and operation of its disclosure controls and procedures with respect to
the Partnership within 90 days of the filing date of this quarterly report, and,
based on their evaluation, have concluded that these disclosure controls and
procedures are effective. Additionally, there were no significant changes in the
Partnership's internal controls or in other factors that could significantly
affect these controls subsequent to the date of their evaluation, including any
corrective actions with regard to significant deficiencies and material
weaknesses.

                                       12
<Page>

                           PART II - OTHER INFORMATION

Item 1.   Legal Proceedings

          There are no pending proceedings to which the Partnership or MLIM LLC
          is a party.

Item 2.   Changes in Securities and Use of Proceeds

          (a) None.
          (b) None.
          (c) None.
          (d) None.

Item 3.   Defaults Upon Senior Securities

          None.

Item 4.   Submission of Matters to a Vote of Security Holders

          None.

Item 5.   Other Information

          None.

Item 6.   Exhibits and Reports on Form 8-K.

          (a)  Exhibits

          There are no exhibits required to be filed with this report.

          (b)  Reports on Form 8-K

          There were no reports on Form 8-K filed during the first six months of
          fiscal 2003.

                                       13
<Page>

                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                             ML PRINCIPAL PROTECTION L.P.

                                             By: MERRILL LYNCH INVESTMENT
                                                 MANAGERS LLC
                                                   General Partner




Date: August 14, 2003                        By /s/ FABIO P. SAVOLDELLI
                                                ------------------------
                                             Fabio P. Savoldelli

                                             Executive Vice President, Chief
                                             Investment Officer and Managing
                                             Director - Alternative Strategies
                                             Division (Principal Executive
                                             Officer)




Date: August 14, 2003                        By /s/ PATRICK HAYWARD
                                                -------------------
                                             Patrick Hayward
                                             Chief Financial Officer
                                             (Principal Financial and Accounting
                                             Officer)

                                       14
<Page>

                                   EXHIBIT 99

          FORM OF CERTIFICATION PURSUANT TO SECTION 1350 OF CHAPTER 63
                     OF TITLE 180 OF THE UNITED STATES CODE

I, Fabio P. Savoldelli, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ML Principal Protection
L.P.;

2. Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this quarterly
report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and have:

     a) designed such disclosure controls and procedures to ensure that material
     information relating to the registrant, including its consolidated
     subsidiaries, is made known to us by others within those entities,
     particularly during the period in which this quarterly report is being
     prepared;

     b) evaluated the effectiveness of the registrant's disclosure controls and
     procedures as of a date within 90 days prior to the filing date of this
     quarterly report (the "Evaluation Date"); and

     c) presented in this quarterly report our conclusions about the
     effectiveness of the disclosure controls and procedures based on our
     evaluation as of the Evaluation Date;

5. The registrant's other certifying officers and I have disclosed, based on our
most recent evaluation, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent function):

     a) all significant deficiencies in the design or operation of internal
     controls which could adversely affect the registrant's ability to record,
     process, summarize and report financial data and have identified for the
     registrant's auditors any material weaknesses in internal controls; and

     b) any fraud, whether or not material, that involves management or other
     employees who have a significant role in the registrant's internal
     controls;

6. The registrant's other certifying officers and I have indicated in this
quarterly report whether there were significant changes in internal controls or
in other factors that could significantly affect internal controls subsequent to
the date of our most recent evaluation, including any corrective actions with
regard to significant deficiencies and material weaknesses.

Date: August 14, 2003

- -----------------------
By /s/ FABIO P. SAVOLDELLI
   -----------------------
Fabio P. Savoldelli
Executive Vice President, Chief Investment Officer and Managing Director -
Alternative Strategies Division (Principal Executive Officer)

                                       15
<Page>

                                 EXHIBIT 99 (a)

                                  AS ADOPTED TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this quarterly report of ML Principal Protection L.P. on Form
10-Q for the period ended June 30, 2003 as filed with the Securities and
Exchange Commission on the date hereof, I, Fabio P. Savoldelli certify, pursuant
to 18 U.S.C. Section 1350, as adopted pursuant of the Sarbanes-Oxley Act of
2002, that:

1. This quarterly report fully complies with the requirements of Section 13 or
15(d) of the Securities and Exchange Act of 1934; and

2. The information contained in this quarterly report fairly presents, in all
material respects, the financial condition and results of operations of ML
Principal Protection L.P.

Date: August 14, 2003

- -----------------------
By /s/ FABIO P. SAVOLDELLI
   -----------------------
Fabio P. Savoldelli
Executive Vice President, Chief Investment Officer and Managing Director -
Alternative Strategies Division (Principal Executive Officer)

                                       16
<Page>

                                   EXHIBIT 99

          FORM OF CERTIFICATION PURSUANT TO SECTION 1350 OF CHAPTER 63
                     OF TITLE 180 OF THE UNITED STATES CODE

I, Patrick Hayward, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ML Principal Protection
L.P.;

2. Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this quarterly
report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and have:

     a) designed such disclosure controls and procedures to ensure that material
     information relating to the registrant, including its consolidated
     subsidiaries, is made known to us by others within those entities,
     particularly during the period in which this quarterly report is being
     prepared;

     b) evaluated the effectiveness of the registrant's disclosure controls and
     procedures as of a date within 90 days prior to the filing date of this
     quarterly report (the "Evaluation Date"); and

     c) presented in this quarterly report our conclusions about the
     effectiveness of the disclosure controls and procedures based on our
     evaluation as of the Evaluation Date;

5. The registrant's other certifying officers and I have disclosed, based on our
most recent evaluation, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent function):

     a) all significant deficiencies, in the design or operation of internal
     controls which could adversely affect the registrant's ability to record,
     process, summarize and report financial data and have identified for the
     registrant's auditors any material weaknesses in internal controls; and

     b) any fraud, whether or not material, that involves management or other
     employees who have a significant role in the registrant's internal
     controls;

6. The registrant's other certifying officers and I have indicated in this
quarterly report whether there were significant changes in internal controls or
in other factors that could significantly affect internal controls subsequent to
the date of our most recent evaluation, including any corrective actions with
regard to significant deficiencies and material weaknesses.

Date: August 14, 2003

- -----------------------
By /s/ PATRICK HAYWARD
   -------------------
Patrick Hayward
Chief Financial Officer
(Principal Financial and Accounting Officer)

                                       17
<Page>

                                 EXHIBIT 99 (a)

                                 AS ADOPTED TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this quarterly report of ML Principal Protection L.P. on Form
10-Q for the period ended June 30, 2003 as filed with the Securities and
Exchange Commission on the date hereof, I, Patrick Hayward certify, pursuant to
18 U.S.C. Section 1350, as adopted pursuant of the Sarbanes-Oxley Act of 2002,
that:

1. This quarterly report fully complies with the requirements of Section 13 or
15(d) of the Securities and Exchange Act of 1934; and

2. The information contained in this quarterly report fairly presents, in all
material respects, the financial condition and results of operations of ML
Principal Protection L.P.

Date: August 14, 2003

- -----------------------
By /s/ PATRICK HAYWARD
   -------------------
Patrick Hayward
Chief Financial Officer
(Principal Financial and Accounting Officer)

                                       18