HANOVER INSURANCE GROUP INC/ (THG) Institutional Shareholders
HANOVER INSURANCE GROUP INC/ (THG) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $5.20B in THG holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of THG tracked by InsiderSet, reporting ownership valued at approximately $638.13M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $855.25M, representing an estimated gain of +34.02% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 48% of the total disclosed THG value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, State Street Corp, and several other long-term asset managers with concentrated positions in HANOVER INSURANCE GROUP INC/ (THG).
This page ranks the largest institutional THG shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
506
Total Reported Value
$5.20B
Largest Holder
Blackrock, Inc.
Largest Position
$638.13M
Insider Transactions (90d)
31
Latest Filing Quarter
Q2 2026
New Institutional Positions
61
Funds Exiting Positions
1
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 3,681,166 | $638,130,182 | $855,245,297 | +$217,115,115 | +34.02% | |
| Vanguard Portfolio Management Llc | 0.02% | 1,932,460 | $334,991,941 | $448,968,432 | +$113,976,491 | +34.02% | |
| State Street Corp | 0.01% | 1,631,422 | $282,807,004 | $379,028,273 | +$96,221,269 | +34.02% | |
| Vanguard Capital Management Llc | 0.01% | 1,452,355 | $251,765,739 | $337,425,637 | +$85,659,898 | +34.02% | |
| Aqr Capital Management Llc | 0.08% | 1,013,395 | $175,449,138 | $235,442,060 | +$59,992,922 | +34.19% | |
| American Century Companies Inc | 0.09% | 1,002,527 | $173,788,382 | $232,917,098 | +$59,128,716 | +34.02% | |
| Fuller & Thaler Asset Management, Inc. | 0.58% | 989,837 | $171,588,192 | $229,968,830 | +$58,380,638 | +34.02% | |
| Dimensional Fund Advisors Lp | 0.03% | 970,177 | $168,178,832 | $225,401,222 | +$57,222,390 | +34.02% | |
| Alliancebernstein L.P. | 0.05% | 831,545 | $151,981,480 | $193,192,850 | +$41,211,370 | +27.12% | |
| First Trust Advisors Lp | 0.10% | 827,320 | $143,415,918 | $192,211,256 | +$48,795,338 | +34.02% | |
| Massachusetts Financial Services Co | 0.04% | 595,647 | $127,539,936 | $138,386,668 | +$10,846,732 | +8.50% | |
| Geode Capital Management, Llc | 0.01% | 728,167 | $126,255,202 | $169,175,039 | +$42,919,837 | +33.99% | |
| Ameriprise Financial Inc | 0.03% | 694,771 | $120,438,547 | $161,416,146 | +$40,977,599 | +34.02% | |
| Qube Research & Technologies Ltd | 0.12% | 492,751 | $85,418,386 | $114,480,840 | +$29,062,454 | +34.02% | |
| Charles Schwab Investment Management Inc | 0.01% | 470,830 | $81,618,381 | $109,387,934 | +$27,769,553 | +34.02% | |
| Morgan Stanley | 0.00% | 462,672 | $80,204,796 | $107,492,586 | +$27,287,790 | +34.02% | |
| Vaughan Nelson Investment Management, L.P. | 0.71% | 372,514 | $79,762,698 | $86,546,178 | +$6,783,480 | +8.50% | |
| Invesco Ltd. | 0.01% | 452,884 | $78,507,442 | $105,218,540 | +$26,711,098 | +34.02% | |
| Woodline Partners Lp | 0.27% | 418,980 | $72,630,183 | $97,341,623 | +$24,711,440 | +34.02% | |
| Allspring Global Investments Holdings, Llc | 0.12% | 401,539 | $69,189,185 | $93,289,556 | +$24,100,371 | +34.83% | |
| London Co Of Virginia | 0.41% | 381,668 | $66,163,742 | $88,672,926 | +$22,509,184 | +34.02% | |
| Markel Group Inc. | 0.46% | 281,000 | $60,167,720 | $65,284,730 | +$5,117,010 | +8.50% | |
| Northern Trust Corp | 0.01% | 342,173 | $59,315,689 | $79,497,053 | +$20,181,364 | +34.02% | |
| Bank Of New York Mellon Corp | 0.01% | 338,870 | $58,743,168 | $78,729,667 | +$19,986,499 | +34.02% | |
| Nomura Asset Management International Inc. | 0.08% | 277,050 | $48,027,000 | $64,367,027 | +$16,340,027 | +34.02% | |
| Bank Of America Corp | 0.00% | 251,130 | $43,533,360 | $58,345,033 | +$14,811,673 | +34.02% | |
| Ubs Group Ag | 0.01% | 237,770 | $41,217,429 | $55,241,104 | +$14,023,675 | +34.02% | |
| Goldman Sachs Group Inc | 0.00% | 218,782 | $37,925,890 | $50,829,622 | +$12,903,732 | +34.02% | |
| Vanguard Fiduciary Trust Co | 0.01% | 216,524 | $37,534,435 | $50,305,021 | +$12,770,586 | +34.02% | |
| Adage Capital Partners Gp, L.L.C. | 0.06% | 215,370 | $37,334,390 | $50,036,912 | +$12,702,522 | +34.02% | |
| Quantinno Capital Management Lp | 0.06% | 207,152 | $35,909,930 | $48,127,624 | +$12,217,694 | +34.02% | |
| William Blair Investment Management, Llc | 0.11% | 195,760 | $33,934,996 | $45,480,921 | +$11,545,925 | +34.02% | |
| Franklin Resources Inc | 0.01% | 182,488 | $31,634,295 | $42,397,437 | +$10,763,142 | +34.02% | |
| Arbejdsmarkedets Tillaegspension | 0.69% | 147,109 | $31,498,979 | $34,177,834 | +$2,678,855 | +8.50% | |
| Primecap Management Co/Ca/ | 0.02% | 176,040 | $30,516,535 | $40,899,373 | +$10,382,838 | +34.02% | |
| Brown Advisory Inc | 0.05% | 172,514 | $29,905,276 | $40,080,178 | +$10,174,902 | +34.02% | |
| Boston Trust Walden Corp | 0.23% | 138,180 | $29,587,101 | $32,103,359 | +$2,516,258 | +8.50% | |
| Jacobs Levy Equity Management, Inc | 0.11% | 152,763 | $26,481,466 | $35,491,428 | +$9,009,962 | +34.02% | |
| Gotham Asset Management, Llc | 0.08% | 151,751 | $26,306,036 | $35,256,310 | +$8,950,274 | +34.02% | |
| Proshare Advisors Llc | 0.04% | 149,856 | $25,977,538 | $34,816,044 | +$8,838,506 | +34.02% | |
| Envestnet Asset Management Inc | 0.01% | 116,460 | $24,936,368 | $27,057,152 | +$2,120,784 | +8.50% | |
| Balyasny Asset Management L.P. | 0.05% | 143,474 | $24,871,218 | $33,333,314 | +$8,462,096 | +34.02% | |
| Altrinsic Global Advisors Llc | 0.81% | 130,221 | $22,573,810 | $30,254,245 | +$7,680,435 | +34.02% | |
| Millennium Management Llc | 0.02% | 118,796 | $20,593,287 | $27,599,875 | +$7,006,588 | +34.02% | |
| Barclays Plc | 0.01% | 117,980 | $20,451,834 | $27,410,293 | +$6,958,459 | +34.02% | |
| Citadel Advisors Llc | 0.01% | 117,634 | $20,391,853 | $27,329,907 | +$6,938,054 | +34.02% | |
| Janus Henderson Group Plc | 0.01% | 116,871 | $20,260,959 | $27,152,639 | +$6,891,680 | +34.01% | |
| Leeward Investments, Llc - Ma | 0.88% | 90,134 | $19,299,492 | $20,940,832 | +$1,641,340 | +8.50% | |
| Interval Partners, Lp | 0.65% | 109,022 | $18,898,964 | $25,329,081 | +$6,430,117 | +34.02% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 108,971 | $18,890,122 | $25,317,232 | +$6,427,110 | +34.02% |
Frequently asked questions about THG
Who owns the most THG stock?
The largest holders of THG are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for HANOVER INSURANCE GROUP INC/ (THG).
Is THG widely held by superinvestors?
Many widely followed stocks like THG appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly THG is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.