Form 13-F position report

BERKSHIRE HATHAWAY INC DEL

Reported by FACTORY MUTUAL INSURANCE CO

BRK-B CUSIP 084670702 Manager CIK 0000887818

Reported 231,100 shares, down 23,400 (9.2%) from the prior quarter.

Reported value -9.2%; share count -9.2% vs. the prior quarter.

Reduced
% of reported 13F value 1.18% This manager · Q4 2025
Shares 231,100 Quarter-end amount reported
Reported value $116,162,415 Fair value at quarter end
Consecutive quarters held 51 Through Q4 2025

Reported position value by quarter

Reported position value by quarter

Each bar is a Form 13-F quarter-end snapshot. It does not show trades made within the quarter.

Reported position value by quarter
Date Holding Value
2021-12-31 110554000
2022-03-31 121824000
2022-06-30 93100000
2022-09-30 90253000
2022-12-31 82167400
2023-03-31 80558093
2023-06-30 88966900
2023-09-30 91393270
2023-12-31 93052594
2024-03-31 108325952
2024-06-30 104181480
2024-09-30 117136170
2024-12-31 115359760
2025-03-31 135541610
2025-06-30 123628465
2025-09-30 127947330
2025-12-31 116162415
2026-03-31 113570400
2026-06-30 117791806
2026-09-30 116594993

Quarterly position history

How this manager's reported quarter-end position changed over time.

20 quarters
Quarterly reported position history for BERKSHIRE HATHAWAY INC DEL held by FACTORY MUTUAL INSURANCE CO.
Quarter Activity Shares Change % of reported 13F Reported value Filed Source filing
Q3 2026 Reduced 234,150 -1,250 (-0.5%) 1.04% $116,594,993 2026-10-30
Q2 2026 Reduced 235,400 -1,600 (-0.7%) 1.11% $117,791,806 2026-07-21
Q1 2026 Added 237,000 +5,900 (2.6%) 1.28% $113,570,400 2026-05-05
Q4 2025 Reduced 231,100 -23,400 (-9.2%) 1.18% $116,162,415 2026-01-23
Q3 2025 Unchanged 254,500 0 (0.0%) 1.25% $127,947,330 2025-11-10
Q2 2025 Unchanged 254,500 0 (0.0%) 1.35% $123,628,465 2025-08-07
Q1 2025 Unchanged 254,500 0 (0.0%) 1.57% $135,541,610 2025-04-17
Q4 2024 Unchanged 254,500 0 (0.0%) 1.25% $115,359,760 2025-01-24
Q3 2024 Reduced 254,500 -1,600 (-0.6%) 1.21% $117,136,170 2024-10-10
Q2 2024 Reduced 256,100 -1,500 (-0.6%) 1.19% $104,181,480 2024-07-23
Q1 2024 Reduced 257,600 -3,300 (-1.3%) 1.24% $108,325,952 2024-04-12
Q4 2023 Unchanged 260,900 0 (0.0%) 1.16% $93,052,594 2024-01-23
Q3 2023 Unchanged 260,900 0 (0.0%) 1.27% $91,393,270 2023-11-07
Q2 2023 Unchanged 260,900 0 (0.0%) 1.31% $88,966,900 2023-07-27
Q1 2023 Reduced 260,900 -5,100 (-1.9%) 1.26% $80,558,093 2023-05-08
Q4 2022 Reduced 266,000 -72,000 (-21.3%) 1.24% $82,167,400 2023-02-02
Q3 2022 Reduced 338,000 -3,000 (-0.9%) 1.48% $90,253,000 2022-11-04
Q2 2022 Reduced 341,000 -4,200 (-1.2%) 1.53% $93,100,000 2022-08-08
Q1 2022 Reduced 345,200 -25,500 (-6.9%) 1.65% $121,824,000 2022-05-13
Q4 2021 Reduced 370,700 -84,038 (-18.5%) 1.6% $110,554,000 2022-02-10
Five years are shown. A free account unlocks the complete reported history. Unlock full history

Who else reported the position

5051 managers reported BERKSHIRE HATHAWAY INC DEL for Q4 2025.

Managers reporting BERKSHIRE HATHAWAY INC DEL in Q4 2025.
Manager Activity Shares Change % of reported 13F Reported value Tenure
VANGUARD GROUP INC Added 157,103,196 +2,777,083 1.14% $78,967,921,468 51 qtrs
BlackRock Inc Added 121,193,733 +6,572,332 1.03% $60,918,030,137 6 qtrs
STATE STREET CORPORATION Added 73,925,068 +1,112,094 1.25% $37,158,435,430 41 qtrs
GEODE CAPITAL MANAGEMENT LLC Added 40,022,166 +61,224 1.24% $20,063,290,387 51 qtrs
MORGAN STANLEY Reduced 26,280,201 -292,324 0.79% $13,209,744,399 51 qtrs
BILL & MELINDA GATES FOUNDATION TRUST Reduced 19,406,764 -2,358,460 27.59% $9,754,809,925 51 qtrs
NORTHERN TRUST CORPORATION Reduced 15,528,328 -314,306 1.0% $7,805,314,069 23 qtrs
JPMorgan Chase & Co Added 12,883,585 +300,024 0.41% $6,475,935,032 51 qtrs
THE BANK OF NEW YORK MELLON CORPORATION Added 11,167,907 +49,958 0.99% $5,613,548,366 51 qtrs
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Added 11,044,013 +76,080 0.86% $5,551,273,134 51 qtrs
Premium adds each manager's conviction percentile across reporting peers.
Filing details and methodology As reported
Report period
December 31, 2025
Filed
January 23, 2026
Filing type
13F-HR
Position type
CL B NEW

Voting authority reported

Sole
231,100
Shared
0
None
0

“None” means the manager reported no voting authority for those shares on non-routine matters. It does not disclose why and is not evidence of securities lending.

Form 13-F is a delayed quarter-end snapshot of disclosed long Section 13(f) securities. It can be filed up to 45 days after quarter end, excludes short positions and most non-U.S. securities, and does not reveal intra-quarter trading. For options, reported shares and value describe the underlying-share exposure; strike, expiry, premium, and written positions are not disclosed.