Arrowhead Pharmaceuticals, Inc.
US ˙ NasdaqGS ˙ US04280A1007

SecurityARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionStrs Ohio
Latest Disclosed Ownership32,500 shares
Latest Disclosed Value $ 2,037,750
Strs Ohio reports 3.17% increase in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On April 24, 2026 - Strs Ohio filed a 13F-HR form disclosing ownership of 32,500 shares of Arrowhead Pharmaceuticals, Inc. (US:ARWR) valued at $2,037,750 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 31,500 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of 3.17% during the quarter. The current value of the position is $2,442,700 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)
2026-04-24 2026-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 32,500 1,000 3.17 2,038 -2.58 0.0081
2026-02-02 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 31,500 21,200 205.83 2,091 489.01 0.0078
2025-10-30 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 10,300 9,100 758.33 355 1,872.22 0.0013
2025-08-04 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 1,200 1,200 19 0.0001
2024-11-01 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 0 -23,100 -100.00 0 -100.00
2024-08-05 2024-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 23,100 -2,600 -10.12 600 0.0024
2024-05-13 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM_STK 04280A100 25,700 -2,800 -9.82 1 0.0029
2024-01-30 2023-12-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 28,500 1,900 7.14 1 0.0036
2023-10-26 2023-09-30 13F/A-1 ARROWHEAD PHARMACEUTICALS COM 04280A100 26,600 0 0.00 1 0.0032
2023-10-26 2023-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 26,600 0 1 0.0032
2023-07-31 2023-06-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 26,600 400 1.53 1 0.0040
2023-08-02 2023-03-31 13F/A-2 ARROWHEAD PHARMACEUTICALS COM 04280A100 26,200 -7,900 -23.17 1 -100.00 0.0029
2023-08-02 2023-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS COM 04280A100 26,200 1
2023-04-27 2023-03-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 26,200 -7,900 1 0.0034
2023-01-26 2022-12-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 34,100 0 0.00 1 -99.91 0.0062
2022-10-27 2022-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 34,100 -6,600 -16.22 1,127 -21.35 0.0054
2022-07-25 2022-06-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 40,700 1,200 3.04 1,433 -21.09 0.0065
2022-04-21 2022-03-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 39,500 6,200 18.62 1,816 -17.72 0.0066
2022-01-24 2021-12-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 33,300 2,000 6.39 2,207 12.95 0.0077
2021-10-22 2021-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 31,300 -200 -0.63 1,954 -25.08 0.0074
2021-07-26 2021-06-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 31,500 4,600 17.10 2,608 46.27 0.0094
2021-04-23 2021-03-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 26,900 1,300 5.08 1,783 -9.22 0.0067
2021-01-25 2020-12-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 25,600 3,300 14.80 1,964 104.58 0.0076
2020-12-14 2020-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 22,300 -10,300 -31.60 960 -31.77 0.0040
2020-07-23 2020-06-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 32,600 -4,600 -12.37 1,407 31.50 0.0061
2020-04-23 2020-03-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 37,200 4,700 14.46 1,070 -48.08 0.0056
2020-01-24 2019-12-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 32,500 -10,100 -23.71 2,061 71.75 0.0086
2019-10-21 2019-09-30 13F/A-1 ARROWHEAD PHARMACEUTICALS COM 04280A100 42,600 16,200 61.36 1,200 71.67 0.0053
2019-10-21 2019-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 42,600 10,100 1,200 5,311.2666
2019-07-25 2019-06-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 26,400 13,800 109.52 699 202.60 0.0031
2019-04-19 2019-03-31 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 12,600 12,600 231 0.0010
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.