FACTORY MUTUAL INSURANCE CO
13F-HR, 2000-10-11
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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:  September 30, 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		October 10, 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:	$2,173,222,350

List of Other Included Managers:

<PAGE>


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


	 ANALOG DEVICES                 COM    03265410    2,807,125       34,000
       ASSOCIATES FIRST CAPITAL COR   COM    04600810    2,352,200       61,900
       BANK OF AMERICA CORP.          COM    06050510   11,817,949      225,641
       BRINKER INTL INC               COM    10964110      903,750       30,000
       BRISTOL MYERS SQUIBB CO        COM    11012210    4,825,920       84,480
       CADENCE DESIGN SYSTEM          COM    12738710   14,179,500      552,000
       CHASE MANHATTAN CORP           COM    16161A10    2,909,813       63,000
       CITIGROUP INC                  COM    17296710    7,136,250      132,000
       COMPAQ COMPUTER CORP           COM    20449310    3,715,026      134,700
       COVANCE INC                    COM    22281610    2,328,525      284,400
       CVS CORP                       COM    12665010    4,510,838       97,400
       DEERE & CO                     COM    24419910    5,590,988      168,150
       EATON CORP                     COM    27805810    1,152,388       18,700
       ENRON CORP.                    COM    29356110    5,169,875       59,000
       GENERAL ELECTRIC CO            COM    36960410      899,925       15,600
       GRANT PRIDECO                  COM    38821G10    1,333,800       60,800
       IDEXX LABS CORP                COM    45168D10    1,385,650       51,800
       INGERSOLL RAND                 COM    45686610      846,875       25,000
       J.D. EDWARDS & CO              COM    28166710    1,725,863       66,700
       JOHNSON & JOHNSON              COM    47816010    1,033,313       11,000
       LEAR CORP                      COM    52186510    1,067,194       51,900
       LOWE'S COMPANIES               COM    54866110    1,839,875       41,000
       LUCENT TECHNOLOGIES INC        COM    54946310      696,825       22,800
       MCDONALD'S CORP                COM    58013510    7,063,875      234,000
       MONDAVI ROBERT CORP.           COM    60920010    3,004,313       73,500
       MOTOROLA INCORPORATED          COM    62007610    1,415,325       50,100
       NEWELL RUBBERMAID              COM    65122910    1,391,563       61,000
       ORACLE CORP                    COM    68389X10   71,601,390      909,224
       PARKER HANNIFIN CORP COM       COM    70109410    1,198,125       35,500
       PFIZER INC                     COM    71708110    7,437,156      165,500
       PROCTER & GAMBLE               COM    74271810    5,205,900       77,700
       SOLECTRON CORP                 COM    83418210    3,929,850       85,200
       STAPLES INC                    COM    85503010    1,109,463       78,200
       TYCO INTERNATIONAL LTD         COM    90212410    3,667,563       70,700
       UNUMPROVIDENT CORP             COM    91529Y10    1,580,500       58,000
       WACHOVIA CORP                  COM    92977110    3,372,906       59,500
       WAL-MART STORES INC            COM    93114210    7,940,625      165,000
       WEATHERFORD INTERNATIONAL      COM    94707410    2,614,400       60,800
       WEYERHAEUSER CO                COM    96216610      201,875        5,000
       WORLDCOM INC.                  COM    98157D10    2,155,106       70,950
       ABBOTT LABORATORIES            COM   002824100   18,787,188      395,000
       ALCOA, INC.                    COM   013817101   16,655,625      658,000
       ALLIANCE PHARMACEUTICAL        COM   018773101   17,308,750    1,135,000
       ALTERA CORP.                   COM   021441100   43,834,500      918,000
       AMERICAN POWER CONVERSION      COM   029066107   17,817,513      928,600
       AMERICAN INTL                  COM   026874107      423,704        4,428
       AMGEN                          COM   031162100   15,809,088      226,400
       ANALOG DEVICES                 COM   032654105   42,753,505      517,832
       APPLIED MATERIALS INC          COM   038222105   29,585,075      498,800
       ASSOCIATES FIRST CAPITAL COR   COM   046008108   21,827,200      574,400
       AUTOMATED DATA PROCESSING      COM   053015103   14,980,000      224,000
       BAKER HUGHES INC               COM   057224107   13,456,699      362,470
       BANK OF AMERICA CORP.          COM   060505104   21,848,598      417,157
       BANK ONE                       COM   06423A103            0            0
       BELLSOUTH CORP                 COM   079860102            0            0
       BIOGEN INC                     COM   090597105    8,530,850      139,850
       BP AMOCO PLC                   COM   055622104   22,645,629      427,276
       BRINKER INTL INC               COM   109641100   11,167,338      370,700
       BRISTOL MYERS SQUIBB CO        COM   110122108   58,927,865    1,031,560
       CADENCE DESIGN SYSTEM          COM   127387108   32,709,178    1,273,350
       CATERPILLAR INC                COM   149123101    7,158,375      212,100
       CHASE MANHATTAN CORP           COM   16161A108   18,860,666      408,350
       CHEVRON                        COM   166751107   11,764,500      138,000
       CISCO SYSTEMS                  COM   17275R102   23,724,350      429,400
       CITIGROUP INC                  COM   172967101   21,927,749      405,600
       CK WITCO CORP                  COM   12562C108      472,500       60,000
       COCA COLA CO                   COM   191216100   28,317,713      513,700
       COLGATE-PALMOLIVE              COM   194162103    9,001,040      190,700
       COMPAQ COMPUTER CORP           COM   204493100   30,706,469    1,113,360
       CONSECO INC                    COM   208464107    4,091,323      536,567
       CORNING INC                    COM   219350105   17,018,100       57,300
       COVANCE INC                    COM   222816100    9,401,706    1,148,300
       CVS CORP                       COM   126650100   28,852,688      623,000
       DANAHER CORP COM               COM   235851102    3,482,500       70,000
       DEERE & CO                     COM   244199105    7,828,713      235,450
       WALT DISNEY COMPANY (HOLDING   COM   254687106   37,905,750      991,000
       DUKE ENERGY CORP               COM   264399106   11,842,075      138,100
       EATON CORP                     COM   278058102   11,006,225      178,600
       ECOLAB INC                     COM   278865100   13,343,125      370,000
       ENRON CORP.                    COM   293561106   28,031,238      319,900
       EXXON MOBIL CORP               COM   30231G102   48,128,035      540,006
       FEDERAL NAT'L MORTGAGE ASSOC   COM   313586109   47,004,100      657,400
       FLEET BOSTON CORP.             COM   339030108   32,758,050      839,950
       FORTUNE BRANDS INC             COM   349631101    7,205,350      271,900
       GENERAL ELECTRIC CO            COM   369604103   96,456,384    1,672,050
       GRANT PRIDECO                  COM   38821G101    5,833,181      265,900
       HALLIBURTON CO                 COM   406216101    9,860,906      201,500
       HOME DEPOT                     COM   437076102   20,569,678      387,650
       INTL BUS MACH CORP             COM   459200101   27,146,250      241,300
       IDEXX LABS CORP                COM   45168D104    9,397,275      351,300
       INGERSOLL RAND                 COM   456866102   13,655,013      403,100
       INTEL CORP                     COM   458140100   80,373,563    1,933,800
       INTERPUBLIC GROUP COS INC      COM   460690100    8,740,438      256,600
       J.D. EDWARDS & CO              COM   281667105   25,691,288      992,900
       JOHNSON & JOHNSON              COM   478160104   21,765,319      231,700
       JUPITER MEDIA METRIX INC       COM   48206U104    1,992,188      125,000
       LEAR CORP                      COM   521865105    4,490,850      218,400
       LILLY ELI & CO                 COM   532457108    3,455,925       42,600
       LOWE'S COMPANIES               COM   548661107   16,110,125      359,000
       LUCENT TECHNOLOGIES INC        COM   549463107   14,046,158      459,588
       MASCO                          COM   574599106   17,330,563      930,500
       MCDONALD'S CORP                COM   580135101    7,404,994      245,300
       MERCK & CO INC                 COM   589331107   59,282,025      796,400
       MICROSOFT                      COM   594918104   75,432,844    1,250,700
       MINNESOTA MINING & MFG CO      COM   604059105    4,893,413       53,700
       MONDAVI ROBERT CORP.           COM   609200100    8,767,688      214,500
       MOTOROLA INCORPORATED          COM   620076109   22,943,944      812,175
       NEWELL RUBBERMAID              COM   651229106   12,615,313      553,000
       NIKE INC CL B                  COM   654106103    7,038,981      175,700
       OMNICOM GROUP INC              COM   681919106   24,853,453      340,750
       ORACLE CORP                    COM   68389X105   60,608,835      769,636
       PARKER HANNIFIN CORP COM       COM   701094104   15,248,250      451,800
       PENTAIR INC                    COM   709631105    5,392,800      201,600
       PFIZER INC                     COM   717081103   37,266,669      829,300
       PHILIP MORRIS COMPANIES INC    COM   718154107      765,375       26,000
       PROCTER & GAMBLE               COM   742718109   10,398,400      155,200
       SBC COMMUNICATIONS INC         COM   78387G103   26,398,300      527,966
       SCHLUMBERGER LTD               COM   806857108   18,345,152      222,872
       SMITH (A.O.) CORP              COM   831865209    1,036,406       82,500
       SOLECTRON CORP                 COM   834182107   26,222,063      568,500
       STAPLES INC                    COM   855030102   17,227,697    1,214,287
       SUN MICROSYSTEMS               COM   866810104   35,468,650      303,800
       TARGET CORP                    COM   87612E106    5,637,500      220,000
       TERADYNE INC                   COM   880770102   28,658,000      818,800
       TIME WARNER                    COM   887315109   14,218,025      181,700
       TRANSOCEAN SEDCO FOREX INC     COM   G90078109    6,294,332      107,366
       TYCO INTERNATIONAL LTD         COM   902124106   52,397,693    1,010,076
       UNUMPROVIDENT CORP             COM   91529Y106   24,249,775      889,900
       VERIZON COMMUNICATIONS         COM   92343V104   25,171,322      519,666
       WACHOVIA CORP                  COM   929771103   11,708,236      206,540
       WAL-MART STORES INC            COM   931142103   14,162,803      294,292
       WEATHERFORD INTERNATIONAL      COM   947074100   11,154,200      259,400
       WELLS FARGO COMPANY            COM   949746101   10,496,719      228,500
       WEYERHAEUSER CO                COM   962166104   15,923,900      394,400
       WORLDCOM INC.                  COM   98157D106   20,127,356      662,629
       DEFINED ASSET FUNDS COHEN &    COM   294710512    4,476,100    5,000,000
       </TABLE>


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