FACTORY MUTUAL INSURANCE CO
13F-HR, 2000-04-18
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		               UNITED STATES
     		    SECURITIES AND EXCHANGE COMMISSION
     			     Washington, DC  20549

FORM 13F

FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:  March 31, 2000

Check here if Amendment [  ]; Amendment Number:
This Amendment (Check only one):  [  ]  is a restatement.
					    [  ]  adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:		Factory Mutual Insurance Company
Address:	225 Wyman Street
		Waltham, MA  02454

13F File Number:

The institutional investment manager filling this report and the
person by whom it is signed hereby represent that the person
signing the report is authorized to submit it, that all
information contained herein is true, correct and complete,
and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of
this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:		Paul E. LaFleche
Title:	Vice President & Portfolio Manager-Equities
Phone:	617-243-7129
Signature, Place, and Date of Signing:

	Paul E. LaFleche		Waltham, MA		April 13, 2000
Report Type (Check only one):

[ X ]	13F HOLDINGS REPORT
[   ]	13F NOTICE
[   ]	13F COMBINATION REPORT

List of other Managers Reporting for this Manager:


I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES EXCHANGE ACT OF 1934.
<PAGE>


FORM 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:	0

Form 13F Information Table Entry Total:	2

Form 13F Information Table Value Total:	$2,766,616,152

List of Other Included Managers:

<PAGE>


       <TABLE>                        <C><C>          <C>          <C>


       ALTERA CORP.                   COM    02144110    1,838,550       20,600
       ANALOG DEVICES                 COM    03265410    2,737,000       34,000
       APPLIED MATERIALS INC          COM    03822210            0            0
       ASSOCIATES FIRST CAPITAL COR   COM    04600810    1,323,113       61,900
       BAKER HUGHES INC               COM    05722410      484,000       16,000
       BANK OF AMERICA CORP.          COM    06050510   11,832,052      225,641
       BANK ONE                       COM    06423A10    5,991,753      173,674
       BLOCK H & R INC                COM    09367110    1,033,725       23,100
       BOSTON SCIENTIFIC CORP         COM    10113710      264,275       12,400
       BRINKER INTL INC               COM    10964110      890,625       30,000
       BRISTOL MYERS SQUIBB CO        COM    11012210    4,899,840       84,480
       CADENCE DESIGN SYSTEM          COM    12738710    9,961,875      483,000
       CHASE MANHATTAN CORP           COM    16161A10    2,354,063       27,000
       CITIGROUP INC                  COM    17296710    5,927,625       99,000
       COMPAQ COMPUTER CORP           COM    20449310      945,000       35,000
       COVANCE INC                    COM    22281610    2,412,300      224,400
       CVS CORP                       COM    12665010    3,658,588       97,400
       DEERE & CO                     COM    24419910    6,389,700      168,150
       EMERSON ELECTRIC               COM    29101110            0            0
       ENRON CORP.                    COM    29356110    4,417,625       59,000
       GENERAL ELECTRIC CO            COM    36960410      809,250        5,200
       IDEXX LABS CORP                COM    45168D10    1,207,588       51,800
       INGERSOLL RAND                 COM    45686610    1,106,250       25,000
       J.D. EDWARDS & CO              COM    28166710      543,794       16,700
       JOHNSON & JOHNSON              COM    47816010      772,750       11,000
       LEAR CORP                      COM    52186510    1,459,688       51,900
       LG&E ENERGY CORP               COM    50191710            0            0
       LILLY ELI & CO                 COM    53245710      676,350       10,800
       LOWE'S COMPANIES               COM    54866110      624,613       10,700
       LUCENT TECHNOLOGIES INC        COM    54946310    1,396,500       22,800
       MCDONALD'S CORP                COM    58013510    8,745,750      234,000
       MCI WORLDCOM INC.              COM    55268B10    5,471,484      120,750
       MONDAVI ROBERT CORP.           COM    60920010    2,563,313       73,500
       NEWELL RUBBERMAID              COM    65122910    1,513,563       61,000
       ORACLE CORP                    COM    68389X10   70,976,377      909,225
       PFIZER INC                     COM    71708110    6,051,094      165,500
       PROCTER & GAMBLE               COM    74271810    4,118,850       72,900
       SOLECTRON CORP                 COM    83418210    3,418,650       85,200
       TERADYNE INC                   COM    88077010      557,600        6,800
       TYCO INTERNATIONAL LTD         COM    90212410    2,406,000       48,000
       UNOVA INC                      COM    91529B10    1,562,625      115,750
       UNUMPROVIDENT CORP             COM    91529Y10      982,375       58,000
       WACHOVIA CORP                  COM    92977110    4,019,969       59,500
       WAL-MART STORES INC            COM    93114210    9,322,500      165,000
       WEATHERFORD INTERNATIONAL      COM    94707410    3,556,800       60,800
       ABBOTT LABORATORIES            COM   002824100   13,899,063      395,000
       ALCOA, INC.                    COM   013817101   20,000,175      284,700
       ALLIANCE PHARMACEUTICAL        COM   018773101   13,705,156      917,500
       ALTERA CORP.                   COM   021441100   48,462,750      543,000
       AMERICAN POWER CONVERSION      COM   029066107   43,115,100    1,005,600
       AMERICAN INTL                  COM   026874107    6,236,299       56,953
       AMGEN                          COM   031162100   21,076,175      343,400
       ANALOG DEVICES                 COM   032654105   38,892,126      483,132
       APPLIED MATERIALS INC          COM   038222105   47,935,550      508,600
       ASSOCIATES FIRST CAPITAL COR   COM   046008108   12,277,800      574,400
       AUTOMATED DATA PROCESSING      COM   053015103   13,075,750      271,000
       BAKER HUGHES INC               COM   057224107   13,914,093      459,970
       BANK OF AMERICA CORP.          COM   060505104   21,874,670      417,157
       BANK ONE                       COM   06423A103   13,329,317      386,357
       BELL ATLANTIC CORP COM         COM   077853109   10,861,913      177,700
       BELLSOUTH CORP                 COM   079860102            0            0
       BIOGEN INC                     COM   090597105    9,855,869      141,050
       BLOCK H & R INC                COM   093671105    3,946,950       88,200
       BOSTON SCIENTIFIC CORP         COM   101137107    5,413,375      254,000
       BP AMOCO PLC                   COM   055622104   22,752,448      427,276
       BRINKER INTL INC               COM   109641100   11,005,156      370,700
       BRISTOL MYERS SQUIBB CO        COM   110122108   59,830,480    1,031,560
       CADENCE DESIGN SYSTEM          COM   127387108   20,749,781    1,006,050
       CATERPILLAR INC                COM   149123101   10,778,269      273,300
       CHASE MANHATTAN CORP           COM   16161A108   16,277,906      186,700
       CHEVRON                        COM   166751107   12,756,375      138,000
       CISCO SYSTEMS                  COM   17275R102   33,197,988      429,400
       CITIGROUP INC                  COM   172967101   18,213,975      304,200
       CK WITCO CORP                  COM   12562C108      611,250       60,000
       CLOROX COMPANY                 COM   189054109            0            0
       COCA COLA CO                   COM   191216100   24,111,794      513,700
       COLGATE-PALMOLIVE              COM   194162103   10,750,713      190,700
       COMPAQ COMPUTER CORP           COM   204493100   20,583,720      762,360
       CONSECO INC                    COM   208464107    6,136,985      536,567
       CORNING INC                    COM   219350105   13,172,600       67,900
       COVANCE INC                    COM   222816100   12,021,725    1,118,300
       CVS CORP                       COM   126650100   23,401,438      623,000
       DEERE & CO                     COM   244199105    8,947,100      235,450
       DELPHI AUTOMOTIVE SYS CORP C   COM   247126105           -0           -0
       WALT DISNEY COMPANY (HOLDING   COM   254687106   46,022,625    1,115,700
       DUKE ENERGY CORP               COM   264399106    7,250,250      138,100
       EASTMAN KODAK CO               COM   277461109            0            0
       EATON CORP                     COM   278058102    4,680,000       60,000
       ECOLAB INC                     COM   278865100   13,574,375      370,000
       EDISON INTERNATIONAL           COM   281020107    3,312,500      200,000
       EMERSON ELECTRIC               COM   291011104            0            0
       ENRON CORP.                    COM   293561106    23,952,513     319,900
       EXXON MOBIL CORP               COM   30231G102    42,086,788     540,007
       FEDERAL NAT'L MORTGAGE ASSOC   COM   313586109    37,184,188     657,400
       FLEET BOSTON CORP.             COM   339030108    27,683,425     758,450
       FORTUNE BRANDS INC             COM   349631101     6,797,500     271,900
       GENERAL INSTRUMENT CORP        COM   370120107             0           0
       GENERAL ELECTRIC CO            COM   369604103    87,671,344     563,350
       GTE CORPORATION                COM   362320103    19,901,300     280,300
       HALLIBURTON CO                 COM   406216101     9,323,038     226,700
       HOME DEPOT                     COM   437076102    25,003,425     387,650
       INTL BUS MACH CORP             COM   459200101    30,160,800     255,600
       IDEXX LABS CORP                COM   45168D104     8,189,681     351,300
       INGERSOLL RAND                 COM   456866102    17,837,175     403,100
       INTEL CORP                     COM   458140100   159,736,731   1,210,700
       INTERPUBLIC GROUP COS INC      COM   460690100    12,124,350     256,600
       J.D. EDWARDS & CO              COM   281667105    16,616,644     510,300
       JOHNSON & JOHNSON              COM   478160104    16,276,925     231,700
       KOHLS CORP                     COM   500255104     3,813,000      37,200
       LEAR CORP                      COM   521865105     6,142,500     218,400
       LG&E ENERGY CORP               COM   501917108             0           0
       LILLY ELI & CO                 COM   532457108    10,176,563     162,500
       LOWE'S COMPANIES               COM   548661107    20,956,625     359,000
       LUCENT TECHNOLOGIES INC        COM   549463107    28,149,765     459,588
       MAGNA ENTERTAINMENT            COM   559211107             0           0
       MAGNA INTL INC CL A            COM   559222401       863,500      22,000
       MASCO                          COM   574599106    16,928,900     825,800
       MCDONALD'S CORP                COM   580135101     9,168,088     245,300
       MCI WORLDCOM INC.              COM   55268B106    33,226,727     733,280
       MERCK & CO INC                 COM   589331107    49,476,350     796,400
       MICROSOFT                      COM   594918104   132,355,625   1,245,700
       MINNESOTA MINING & MFG CO      COM   604059105     4,755,806      53,700
       MONDAVI ROBERT CORP.           COM   609200100     7,480,688     214,500
       MOTOROLA INCORPORATED          COM   620076109    31,583,450     216,325
       NEWELL RUBBERMAID              COM   651229106    11,426,156     460,500
       OMNICOM GROUP INC              COM   681919106    31,902,719     340,750
       ORACLE CORP                    COM   68389X105    60,079,710     769,636
       PENTAIR INC                    COM   709631105     6,649,013     179,400
       PFIZER INC                     COM   717081103    32,697,844     894,300
       PHILIP MORRIS COMPANIES INC    COM   718154107     4,985,500     236,000
       PNC BANK CORP                  COM   693475105     4,506,250     100,000
       PRAXAIR                        COM   74005P104             0           0
       PROCTER & GAMBLE               COM   742718109     7,774,400     137,600
       RYDER SYSTEM INC               COM   783549108             0           0
       SBC COMMUNICATIONS INC         COM   78387G103    22,240,568     527,966
       SCHLUMBERGER LTD               COM   806857108    19,084,608     249,472
       SMITH (A.O.) CORP              COM   831865209     1,485,000      82,500
       SOLECTRON CORP                 COM   834182107    14,083,875     351,000
       SPRINT CORP (FON GROUP)        COM   852061100    15,386,828     243,270
       STAPLES INC                    COM   855030102    17,399,740     869,987
       SUN MICROSYSTEMS               COM   866810104    28,841,822     307,800
       TARGET CORP                    COM   87612E106     8,222,500     110,000
       TERADYNE INC                   COM   880770102    51,725,600     630,800
       TIME WARNER                    COM   887315109    17,976,944     181,700
       TRANSOCEAN SEDCO FOREX INC     COM   G90078109     7,825,520     152,507
       TYCO INTERNATIONAL LTD         COM   902124106    50,630,060   1,010,076
       UNOVA INC                      COM   91529B106     3,172,500     235,000
       UNUMPROVIDENT CORP             COM   91529Y106    13,887,056     819,900
       WACHOVIA CORP                  COM   929771103    13,954,359     206,540
       WAL-MART STORES INC            COM   931142103    16,627,498     294,292
       WEATHERFORD INTERNATIONAL      COM   947074100    19,094,400     326,400
       WELLS FARGO COMPANY            COM   949746101     5,431,975     133,300
       WEYERHAEUSER CO                COM   962166104     5,415,000      95,000
       WM. WRIGLEY JR. CO             COM   982526105     6,306,306      82,100
       DEFINED ASSET FUNDS COHEN &    COM   294710512     4,476,100   5,000,000
       S&P 500 DEPOSITARY RECEIPT     COM   78462F103     6,015,000      40,000
       </TABLE>


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