ARROWHEAD PHARMACEUTICALS IN (ARWR) Institutional Shareholders
ARROWHEAD PHARMACEUTICALS IN (ARWR) 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 $7.43B in ARWR holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ARWR tracked by InsiderSet, reporting ownership valued at approximately $1.14B 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 $1.56B, representing an estimated gain of +37.18% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 58% of the total disclosed ARWR value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Avoro Capital Advisors Llc, Fmr Llc, and several other long-term asset managers with concentrated positions in ARROWHEAD PHARMACEUTICALS IN (ARWR).
This page ranks the largest institutional ARWR 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
450
Total Reported Value
$7.43B
Largest Holder
Blackrock, Inc.
Largest Position
$1.14B
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
99
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.02% | 18,161,519 | $1,138,727,235 | $1,562,072,249 | +$423,345,014 | +37.18% | |
| Avoro Capital Advisors Llc | 6.61% | 10,699,999 | $670,889,937 | $920,306,914 | +$249,416,977 | +37.18% | |
| Fmr Llc | 0.02% | 7,266,652 | $455,619,058 | $625,004,739 | +$169,385,681 | +37.18% | |
| Vanguard Portfolio Management Llc | 0.02% | 7,146,136 | $448,062,727 | $614,639,157 | +$166,576,430 | +37.18% | |
| State Street Corp | 0.01% | 6,496,130 | $407,307,351 | $558,732,141 | +$151,424,790 | +37.18% | |
| Vanguard Capital Management Llc | 0.01% | 6,032,416 | $378,232,483 | $518,848,100 | +$140,615,617 | +37.18% | |
| Geode Capital Management, Llc | 0.02% | 4,278,828 | $274,501,765 | $368,021,996 | +$93,520,231 | +34.07% | |
| Fred Alger Management, Llc | 0.92% | 3,342,493 | $209,574,311 | $287,487,823 | +$77,913,512 | +37.18% | |
| Invesco Ltd. | 0.03% | 3,280,647 | $205,696,568 | $282,168,448 | +$76,471,880 | +37.18% | |
| Vestal Point Capital, Lp | 3.99% | 2,275,000 | $142,642,500 | $195,672,750 | +$53,030,250 | +37.18% | |
| Baker Bros. Advisors Lp | 0.72% | 1,992,783 | $124,947,494 | $171,399,266 | +$46,451,772 | +37.18% | |
| Goldman Sachs Group Inc | 0.01% | 1,739,923 | $109,093,172 | $149,650,777 | +$40,557,605 | +37.18% | |
| Northern Trust Corp | 0.01% | 1,655,837 | $103,820,980 | $142,418,540 | +$38,597,560 | +37.18% | |
| Siren, L.L.C. | 2.81% | 1,615,476 | $101,290,345 | $138,947,091 | +$37,656,746 | +37.18% | |
| Deerfield Management Company, L.P. | 1.16% | 1,573,297 | $98,645,722 | $135,319,275 | +$36,673,553 | +37.18% | |
| Janus Henderson Group Plc | 0.04% | 1,436,990 | $90,119,095 | $123,595,510 | +$33,476,415 | +37.15% | |
| Ubs Group Ag | 0.01% | 1,336,271 | $83,784,191 | $114,932,669 | +$31,148,478 | +37.18% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 1,330,996 | $83,453,449 | $114,478,966 | +$31,025,517 | +37.18% | |
| Charles Schwab Investment Management Inc | 0.01% | 1,192,085 | $74,743,730 | $102,531,231 | +$27,787,501 | +37.18% | |
| Driehaus Capital Management Llc | 0.55% | 1,190,335 | $74,634,005 | $102,380,713 | +$27,746,708 | +37.18% | |
| D. E. Shaw & Co., Inc. | 0.06% | 1,183,838 | $74,226,643 | $101,821,906 | +$27,595,263 | +37.18% | |
| Fisher Asset Management, Llc | 0.02% | 1,113,568 | $69,820,712 | $95,777,984 | +$25,957,272 | +37.18% | |
| Western Financial Corp/Ca | 19.58% | 820,239 | $66,857,681 | $70,548,756 | +$3,691,075 | +5.52% | |
| Bank Of America Corp | 0.00% | 1,064,455 | $66,741,328 | $91,553,775 | +$24,812,447 | +37.18% | |
| Hood River Capital Management Llc | 0.66% | 1,056,534 | $66,244,682 | $90,872,489 | +$24,627,807 | +37.18% | |
| Renaissance Technologies LLC | Jim Simons | 0.10% | 1,036,495 | $64,988,237 | $89,148,935 | +$24,160,698 | +37.18% |
| Vanguard Fiduciary Trust Co | 0.02% | 965,775 | $60,554,093 | $83,066,308 | +$22,512,215 | +37.18% | |
| Morgan Stanley | 0.00% | 960,507 | $60,223,906 | $82,613,207 | +$22,389,301 | +37.18% | |
| Bank Of New York Mellon Corp | 0.01% | 960,144 | $60,201,043 | $82,581,985 | +$22,380,942 | +37.18% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.12% | 836,981 | $52,478,709 | $71,988,736 | +$19,510,027 | +37.18% | |
| Pictet Asset Management Holding Sa | 0.04% | 573,419 | $46,708,118 | $49,319,768 | +$2,611,650 | +5.59% | |
| Voya Investment Management Llc | 0.04% | 656,129 | $41,139,289 | $56,433,655 | +$15,294,366 | +37.18% | |
| American Century Companies Inc | 0.02% | 651,544 | $40,851,913 | $56,039,299 | +$15,187,386 | +37.18% | |
| Bnp Paribas Financial Markets | 0.03% | 650,599 | $40,792,557 | $55,958,020 | +$15,165,463 | +37.18% | |
| Dimensional Fund Advisors Lp | 0.01% | 608,531 | $38,149,870 | $52,339,751 | +$14,189,881 | +37.20% | |
| Arrowstreet Capital, Limited Partnership | 0.02% | 587,125 | $36,812,738 | $50,498,621 | +$13,685,883 | +37.18% | |
| Rtw Investments, Lp | 0.37% | 585,682 | $36,722,261 | $50,374,509 | +$13,652,248 | +37.18% | |
| Summit Partners Public Asset Management, Llc | 1.61% | 540,144 | $33,867,029 | $46,457,785 | +$12,590,756 | +37.18% | |
| Nuveen, Llc | 0.01% | 499,837 | $31,339,779 | $42,990,980 | +$11,651,201 | +37.18% | |
| Principal Financial Group Inc | 0.02% | 490,122 | $30,730,649 | $42,155,393 | +$11,424,744 | +37.18% | |
| Alyeska Investment Group, L.P. | 0.08% | 472,870 | $29,648,949 | $40,671,549 | +$11,022,600 | +37.18% | |
| Franklin Resources Inc | 0.01% | 462,707 | $29,011,729 | $39,797,429 | +$10,785,700 | +37.18% | |
| Panagora Asset Management Inc | 0.11% | 461,193 | $28,916,801 | $39,667,210 | +$10,750,409 | +37.18% | |
| Rhumbline Advisers | 0.02% | 404,436 | $25,358,110 | $34,785,540 | +$9,427,430 | +37.18% | |
| Susquehanna International Group, Llp | 0.03% | 378,833 | $23,752,829 | $32,583,426 | +$8,830,597 | +37.18% | |
| Eventide Asset Management, Llc | 0.38% | 370,000 | $23,199,000 | $31,823,700 | +$8,624,700 | +37.18% | |
| Privium Fund Management B.V. | 4.79% | 366,936 | $23,006,887 | $31,560,165 | +$8,553,278 | +37.18% | |
| Aberdeen Group Plc | 0.03% | 251,968 | $20,537,912 | $21,671,768 | +$1,133,856 | +5.52% | |
| Canada Pension Plan Investment Board | 0.01% | 325,700 | $20,421,390 | $28,013,457 | +$7,592,067 | +37.18% | |
| Integral Health Asset Management, Llc | 1.00% | 300,000 | $18,810,000 | $25,803,000 | +$6,993,000 | +37.18% |
Frequently asked questions about ARWR
Who owns the most ARWR stock?
The largest holders of ARWR 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 ARROWHEAD PHARMACEUTICALS IN (ARWR).
Is ARWR widely held by superinvestors?
Many widely followed stocks like ARWR appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ARWR 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.