ARKWRIGHT MUTUAL INSURANCE COMPANY
13F-HR, 1999-10-12
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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, 1999

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 12, 1999

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:	$2,065,073,266

List of Other Included Managers:

<PAGE>


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


       ALTERA CORP.                   COM    02144110      893,525       20,600
       ANALOG DEVICES                 COM    03265410      871,250       17,000
       APPLIED MATERIALS INC          COM    03822210    1,211,925       15,600
       ASSOCIATES FIRST CAPITAL COR   COM    04600810      428,400       11,900
       BAKER HUGHES INC               COM    05722410      464,000       16,000
       BANK OF AMERICA CORP.          COM    06050510   12,565,385      225,641
       BANK ONE                       COM    06423A10    6,046,026      173,674
       BLOCK H & R INC                COM    09367110    1,350,906       31,100
       BOSTON SCIENTIFIC CORP         COM    10113710      306,900       12,400
       BRISTOL MYERS SQUIBB CO        COM    11012210    5,702,400       84,480
       CADENCE DESIGN SYSTEM          COM    12738710    6,460,125      483,000
       CHASE MANHATTAN CORP           COM    16161A10    2,035,125       27,000
       CITIGROUP INC                  COM    17296710    4,356,000       99,000
       CVS CORP                       COM    12665010    3,036,450       74,400
       DEERE & CO                     COM    24419910    6,505,303      168,150
       EMERSON ELECTRIC               COM    29101110    7,279,200      115,200
       ENRON CORP.                    COM    29356110    2,422,688       59,000
       FEDERATED DEPT STORES INC.     COM    31410H10    1,148,981       26,300
       GENERAL ELECTRIC CO            COM    36960410      616,525        5,200
       IDEXX LABS CORP                COM    45168D10      891,931       51,800
       J.D. EDWARDS & CO              COM    28166710      948,919       45,800
       JOHNSON & JOHNSON              COM    47816010    1,010,625       11,000
       LEAR CORP                      COM    52186510    1,826,231       51,900
       LG&E ENERGY CORP               COM    50191710    5,640,749      265,447
       LILLY ELI & CO                 COM    53245710      693,225       10,800
       LOWE'S COMPANIES               COM    54866110      521,625       10,700
       LUCENT TECHNOLOGIES INC        COM    54946310    1,479,150       22,800
       MCDONALD'S CORP                COM    58013510   10,120,500      234,000
       MCI WORLDCOM INC.              COM    55268B10    5,785,938       80,500
       MONDAVI ROBERT CORP.           COM    60920010    2,760,844       73,500
       ORACLE CORP                    COM    68389X10   20,684,869      454,613
       PFIZER INC                     COM    71708110    4,197,375      117,000
       PROCTER & GAMBLE               COM    74271810    6,834,375       72,900
       TERADYNE INC                   COM    88077010      239,700        6,800
       UNOVA INC                      COM    91529B10    1,548,156      115,750
       WACHOVIA CORP                  COM    92977110    4,678,188       59,500
       WAL-MART STORES INC            COM    93114210    7,847,813      165,000
       WEATHERFORD INTERNATIONAL      COM    94707410    1,945,600       60,800
       ABBOTT LABORATORIES            COM   002824100   15,408,750      420,000
 ALCOA, INC.                    COM   013817101   16,179,694      260,700
 ALLIANCE PHARMACEUTICAL        COM   018773101    2,531,250      500,000
 ALLTEL CORP                    COM   020039103   17,664,125      251,000
 ALTERA CORP.                   COM   021441100   24,819,175      572,200
 AMERICAN POWER CONVERSION      COM   029066107    9,999,700      526,300
 AMERICAN INTL                  COM                4,944,189       56,953
 AMERITECH CORPORATION          COM   030954101    5,740,500       86,000
 AMGEN                          COM   031162100   24,450,000      300,000
 ANALOG DEVICES                 COM   032654105   21,323,383      416,066
 APPLIED MATERIALS INC          COM   038222105   37,072,475      477,200
 ASSOCIATES FIRST CAPITAL COR   COM   046008108   13,755,600      382,100
 AUTOMATED DATA PROCESSING      COM   053015103   27,221,250      610,000
 BAKER HUGHES INC               COM   057224107    7,252,030      250,070
 BANK OF AMERICA CORP.          COM   060505104   22,952,080      412,159
 BANK OF NEW YORK               COM   064057102    3,276,875       98,000
 BANK ONE                       COM   06423A103   10,719,454      307,920
 BELL ATLANTIC CORP COM         COM   077853109   11,961,431      177,700
 BELLSOUTH CORP                 COM   079860102    6,196,680      137,704
 BIOGEN INC                     COM   090597105   21,886,231      277,700
 BLOCK H & R INC                COM   093671105    4,699,938      108,200
 BOSTON SCIENTIFIC CORP         COM   101137107    6,286,500      254,000
 BP AMOCO PLC                   COM   055622104   26,776,623      241,639
 BRISTOL MYERS SQUIBB CO        COM   110122108   67,942,800    1,006,560
 CADENCE DESIGN SYSTEM          COM   127387108    9,371,194      700,650
 CATERPILLAR INC                COM   149123101   14,980,256      273,300
 CHASE MANHATTAN CORP           COM   16161A108    9,587,700      127,200
 CHEVRON                        COM   166751107   12,247,500      138,000
 CINTAS CORP                    COM   172908105    4,625,000       80,000
 CISCO SYSTEMS                  COM   17275R102   13,753,638      200,600
 CITIGROUP INC                  COM   172967101   12,025,200      273,300
 CK WITCO CORP                  COM   12562C108    5,801,250      390,000
 CLOROX COMPANY                 COM   189054109    3,641,400       95,200
 COCA COLA CO                   COM   191216100   24,786,025      513,700
 COLGATE-PALMOLIVE              COM   194162103    9,479,400      207,200
 COMPAQ COMPUTER CORP           COM   204493100   12,388,185      541,560
 CONAGRA INC                    COM   205887102    3,779,219      167,500
 CONSECO INC                    COM   208464107    1,654,273       87,067
 CORNING INC                    COM   219350105    9,598,750      140,000
 COVANCE INC                    COM   222816100    6,219,375      642,000
 CVS CORP                       COM   126650100   14,721,069      360,700
 DAYTON HUDSON CORP             COM   239753106    6,606,875      110,000
 DEERE & CO                     COM   244199105    9,108,972      235,450
 DELPHI AUTOMOTIVE SYS CORP C   COM   247126105    2,560,508      159,409
 DENTSPLY INC                   COM   249030107    1,820,000       80,000
 WALT DISNEY COMPANY (HOLDING   COM   254687106   34,681,400    1,333,900
 DONNELLEY R R                  COM   257867101    2,541,000       88,000
 DUKE ENERGY CORP               COM   264399106    7,056,000      128,000
 EASTMAN KODAK CO               COM   277461109    9,453,125      125,000
 EATON CORP                     COM   278058102    3,452,500       40,000
 ECOLAB INC                     COM   278865100   12,626,250      370,000
 EDISON INTERNATIONAL           COM   281020107    4,862,500      200,000
 EMERSON ELECTRIC               COM   291011104   16,207,594      256,500
 ENRON CORP.                    COM   293561106   23,725,913      577,800
 EXXON CORP                     COM   302290101   35,773,200      470,700
 FEDERATED DEPT STORES INC.     COM   31410H101    4,325,063       99,000
 FEDERAL NAT'L MORTGAGE ASSOC   COM   313586109   41,210,763      657,400
 FLEET BOSTON CORP.             COM   33901A108   10,786,063      294,500
 FORTUNE BRANDS INC             COM   349631101    8,768,775      271,900
 GENERAL INSTRUMENT CORP        COM   370120107    6,864,000      143,000
 GENERAL ELECTRIC CO            COM   369604103   96,011,913      809,800
 GENERAL MOTORS                 COM   370442105    7,237,813      115,000
 GTE CORPORATION                COM   362320103   21,548,063      280,300
 HALLIBURTON CO                 COM   406216101    8,200,000      200,000
 HOME DEPOT                     COM   437076102   32,418,450      472,400
 INTL BUS MACH CORP             COM   459200101   42,967,100      355,100
 IDEXX LABS CORP                COM   45168D104    7,460,884      433,300
 INGERSOLL RAND                 COM   456866102    8,240,625      150,000
 INTEL CORP                     COM   458140100  106,088,525    1,427,600
 INTERPUBLIC GROUP COS INC      COM   460690100    6,547,100      159,200
 J.D. EDWARDS & CO              COM   281667105   14,407,819      695,400
 JOHNSON & JOHNSON              COM   478160104   19,514,250      212,400
 KOHLS CORP                     COM   500255104   10,844,500      164,000
 LEAR CORP                      COM   521865105    7,684,950      218,400
 LG&E ENERGY CORP               COM   501917108      873,673       41,114
 LILLY ELI & CO                 COM   532457108   10,430,469      162,500
 LOWE'S COMPANIES               COM   548661107   13,776,750      282,600
 LUCENT TECHNOLOGIES INC        COM   549463107   29,426,522      453,588
 MAGNA INTL INC CL A            COM   559222401    1,093,125       22,000
 MASCO                          COM   574599106   11,780,000      380,000
 MCDONALD'S CORP                COM   580135101    6,742,675      155,900
 MCI WORLDCOM INC.              COM   55268B106   35,136,309      488,853
 MERCK & CO INC                 COM   589331107   50,125,988      773,400
 MICROSOFT                      COM   594918104  109,644,019    1,210,700
 MINERALS TECHNOLOGIES INC      COM   603158106    3,399,375       70,000
 MINNESOTA MINING & MFG CO      COM   604059105    5,158,556       53,700
 MOBIL CORP                     COM   607059102    4,684,875       46,500
 MONDAVI ROBERT CORP.           COM   609200100    6,378,113      169,800
 MONSANTO CO                    COM   611662107    6,780,625      190,000
 MOTOROLA INCORPORATED          COM   620076109   20,460,000      232,500
 NEWELL RUBBERMAID              COM   651192106    9,117,150      319,200
 OFFSHORE LOGISTICS             COM   676255102      257,813       25,000
 OMNICOM GROUP INC              COM   681919106   40,860,750      516,000
 ORACLE CORP                    COM   68389X105   22,464,169      493,718
 PALL CORP                      COM   696429307            0            0
 PENTAIR INC                    COM   709631105    5,296,500      132,000
 PFIZER INC                     COM   717081103   29,973,563      835,500
 PHILIP MORRIS COMPANIES INC    COM   718154107    8,068,250      236,000
 PNC BANK CORP                  COM   693475105    5,268,750      100,000
 POTASH CORP SASK INC COM       COM   73755L107    1,806,875       35,000
 PRAXAIR                        COM   74005P104    5,828,200      126,700
 PROCTER & GAMBLE               COM   742718109   16,134,375      172,100
 RAYTHEON CO-CLASS B            COM   755111408    8,272,488      166,700
 RYDER SYSTEM INC               COM   783549108    2,445,000      120,000
 SBC COMMUNICATIONS INC         COM   78387G103   22,380,183      438,290
 SCHLUMBERGER LTD               COM   806857108   15,545,224      249,472
 SIGMA-ALDRICH                  COM   826552101    1,111,250       35,000
 SMITH (A.O.) CORP              COM   831865209    2,495,625       82,500
 SPRINT CORP (FON GROUP)        COM   852061100   10,322,148      190,270
 STAPLES INC                    COM   855030102   11,394,577      522,388
 SUN MICROSYSTEMS               COM   866810104   25,305,300      272,100
 TERADYNE INC                   COM   880770102   31,400,700      890,800
 TEXTRON INC                    COM   883203101    7,737,500      100,000
 TIME WARNER                    COM   887315109   14,166,900      233,200
 TYCO INTERNATIONAL LTD         COM   902124106    6,766,799       65,538
 UNOCAL CORP                    COM   915289102    2,038,438       55,000
 UNOVA INC                      COM   91529B106    3,143,125      235,000
 UNUMPROVIDENT CORP             COM   91529Y106    9,776,194      332,100
 WACHOVIA CORP                  COM   929771103   16,239,208      206,540
 WAL-MART STORES INC            COM   931142103   18,491,920      388,792
 WARNER-LAMBERT CO              COM   934488107    4,659,525       70,200
 WASHINGTON TRUST BANCORP       COM   940610108    2,089,250      137,000
 WEATHERFORD INTERNATIONAL      COM   947074100    5,056,000      158,000
 WELLS FARGO COMPANY            COM   949746101    5,282,013      133,300
 WEYERHAEUSER CO                COM   962166104    2,881,250       50,000
 WM. WRIGLEY JR. CO             COM   982526105    5,649,506       82,100
 DEFINED ASSET FUNDS COHEN &    COM                4,476,100    5,000,000
 S&P 500 DEPOSITARY RECEIPT     COM   78462F103   10,300,000       80,000
	 </TABLE>


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