Arrowhead Pharmaceuticals, Inc.
MX ˙ BMV ˙ US04280A1007
SecurityMX:ARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership31,498 shares
Latest Disclosed Value $ 1,974,926
ProShare Advisors LLC reports 1.12% decrease in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 31,498 shares of Arrowhead Pharmaceuticals, Inc. (MX:ARWR) valued at $1,974,926 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 31,855 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of -1.12% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-24 2026-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 31,498 -357 -1.12 1,975 -6.62 0.0029
2026-02-06 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 31,855 3,897 13.94 2,115 119.29 0.0037
2025-11-06 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 27,958 -4,218 -13.11 964 89.76 0.0020
2025-08-07 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 32,176 -1,751 -5.16 508 17.59 0.0010
2025-05-08 2025-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 33,927 -11,403 -25.16 432 -49.30 0.0010
2025-02-14 2024-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 45,330 10,005 28.32 852 24.56 0.0019
2024-11-14 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 35,325 6,244 21.47 684 -9.40 0.0017
2024-08-13 2024-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 29,081 -6,511 -18.29 756 -25.76 0.0020
2024-05-08 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 35,592 6,341 21.68 1,018 13.63 0.0027
2024-02-14 2023-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 29,251 3,308 12.75 895 28.41 0.0027
2023-11-13 2023-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 25,943 -553 -2.09 697 -26.17 0.0022
2023-08-10 2023-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 26,496 428 1.64 945 42.60 0.0027
2023-05-26 2023-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 26,068 -4,077 -13.52 662 -45.83 0.0020
2023-05-12 2023-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 26,068 -4,077 662 0.0021
2023-02-02 2022-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 30,145 2,424 8.74 1,223 33.26 0.0043
2022-11-07 2022-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 27,721 384 1.40 917 -4.68 0.0035
2022-08-01 2022-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 27,337 -13,321 -32.76 962 -48.56 0.0032
2022-05-10 2022-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,658 -8,236 -16.84 1,870 -42.30 0.0040
2022-02-08 2021-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 48,894 3,971 8.84 3,241 15.54 0.0064
2021-11-12 2021-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 44,923 -7,938 -15.02 2,805 -35.93 0.0079
2021-08-13 2021-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 52,861 3,130 6.29 4,378 32.75 0.0128
2021-05-14 2021-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 49,731 3,588 7.78 3,298 -6.86 0.0104
2021-02-09 2020-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 46,143 10,451 29.28 3,541 130.38 0.0132
2020-11-13 2020-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 35,692 -947 -2.58 1,537 -2.84 0.0071
2020-08-03 2020-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 36,639 13,929 61.33 1,582 142.27 0.0085
2020-05-15 2020-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 22,710 -19,125 -45.72 653 -75.40 0.0047
2020-02-12 2019-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 41,835 2,991 7.70 2,654 142.37 0.0123
2019-11-12 2019-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 38,844 -1,469 -3.64 1,095 2.53 0.0061
2019-08-13 2019-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,313 -1,875 -4.44 1,068 37.98 0.0064
2019-05-15 2019-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 42,188 3,183 8.16 774 59.92 0.0046
2019-02-14 2018-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 39,005 -7,537 -16.19 484 -45.74 0.0034
2018-11-14 2018-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 46,542 -1,731 -3.59 892 35.77 0.0061
2018-08-13 2018-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 48,273 8,146 20.30 657 127.34 0.0044
2018-05-14 2018-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,127 -155 -0.38 289 95.27 0.0019
2018-02-14 2017-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,282 -1,832 -4.35 148 -18.68 0.0010
2017-11-13 2017-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 42,114 3,734 9.73 182 193.55 0.0017
2017-08-11 2017-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 38,380 -9,274 -19.46 62 -29.55 0.0006
2017-05-12 2017-03-31 13F/A-2 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 47,654 -10,535 -18.10 88 -2.22 0.0009
2017-05-08 2017-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 47,654 0 88 0.0009
2017-04-25 2017-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 47,654 88
2017-02-13 2016-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 58,189 13,938 31.50 90 -72.31 0.0010
2016-11-10 2016-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 44,251 -7,787 -14.96 325 17.33 0.0045
2016-08-12 2016-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 52,038 52,038 277 0.0036
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.