Arrowhead Pharmaceuticals, Inc.
US ˙ NasdaqGS ˙ US04280A1007

SecurityARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership10,914 shares
Latest Disclosed Value $ 684,304
Advisor Group Holdings, Inc. reports 18.19% decrease in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 10,914 shares of Arrowhead Pharmaceuticals, Inc. (US:ARWR) valued at $684,308 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,340 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of -18.19% during the quarter. The current value of the position is $791,811 USD.

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)
2026-05-15 2026-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,914 -2,426 -18.19 684 -22.71 0.0006
2026-02-17 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 13,340 -44,833 -77.07 886 -31.13 0.0013
2025-11-14 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 58,173 46,300 389.96 1,285 587.17 0.0018
2025-09-04 2025-06-30 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 11,873 -22,942 -65.90 188 -57.79 0.0003
2025-08-13 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 36,764 1,949 691 0.0008
2025-05-12 2025-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 34,815 -2,315 -6.23 444 -35.98 0.0010
2025-06-06 2024-12-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 37,130 -153 -0.41 693 -4.16 0.0016
2025-02-07 2024-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 7,315 -29,968 136 0.0003
2024-11-13 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 37,283 -1,450 -3.74 722 -28.23 0.0016
2024-08-13 2024-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 38,733 -286 -0.73 1,007 -9.78 0.0024
2024-05-10 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 39,019 -663 -1.67 1,116 -8.15 0.0025
2024-02-12 2023-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 39,682 -8,202 -17.13 1,214 -5.60 0.0021
2023-11-13 2023-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 47,884 7,100 17.41 1,287 -11.49 0.0019
2023-08-21 2023-06-30 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,784 -333 -0.81 1,454 39.18 0.0026
2023-08-10 2023-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 40,784 -333 1,454 0.0004
2023-05-12 2023-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 41,117 -1,605 -3.76 1,044 -39.76 0.0020
2023-02-10 2022-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 42,722 32,382 313.17 1,733 406.73 0.0035
2022-11-14 2022-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,340 -92 -0.88 342 -7.07 0.0008
2022-08-10 2022-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,432 -359 -3.33 368 -76.07 0.0008
2022-05-04 2022-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,791 -10,278 -48.78 1,538 10.01 0.0030
2022-02-03 2021-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 21,069 -3,505 -14.26 1,398 -8.87 0.0026
2021-11-05 2021-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 24,574 -8,494 -25.69 1,534 -43.99 0.0032
2021-08-02 2021-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 33,068 15,717 90.58 2,739 137.97 0.0059
2021-05-13 2021-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 17,351 4,876 39.09 1,151 20.15 0.0028
2021-02-10 2020-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,475 -8,968 -41.82 958 3.79 0.0026
2020-11-12 2020-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 21,443 1,528 7.67 923 7.33 0.0028
2020-08-14 2020-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 19,915 6,522 48.70 860 123.38 0.0029
2020-05-18 2020-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 13,393 13,393 385 0.0016
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.