Arrowhead Pharmaceuticals, Inc.
MX ˙ BMV ˙ US04280A1007
SecurityMX:ARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionWealth Architects, LLC
Latest Disclosed Ownership12,247 shares
Latest Disclosed Value $ 767,887
Wealth Architects, LLC reports 0.17% decrease in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On May 15, 2026 - Wealth Architects, LLC filed a 13F-HR form disclosing ownership of 12,247 shares of Arrowhead Pharmaceuticals, Inc. (MX:ARWR) valued at $767,887 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 12,268 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of -0.17% 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)
2026-05-15 2026-03-31 13F ARROWHEAD PHARMACEUTICALS Equities 04280A100 12,247 -21 -0.17 768 -5.77 0.0684
2026-02-17 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,268 119 0.98 814 94.27 0.0734
2025-11-13 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,149 -112 -0.91 419 117.10 0.0396
2025-07-25 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,261 -180 -1.45 194 22.15 0.0197
2025-05-14 2025-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,441 331 2.73 158 -30.40 0.0175
2025-05-12 2025-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,441 331 158 0.0175
2025-02-10 2024-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,110 0 0.00 228 -2.99 0.0257
2024-10-31 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,110 0 0.00 235 -25.48 0.0265
2024-08-08 2024-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,110 0 0.00 315 -9.25 0.0384
2024-05-13 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,110 0 0.00 346 -6.49 0.0456
2024-02-14 2023-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,110 -89 -0.73 371 13.15 0.0520
2023-11-09 2023-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,199 0 0.00 328 -24.83 0.0558
2023-08-02 2023-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 12,199 -3,000 -19.74 435 12.69 0.0718
2023-04-21 2023-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,199 0 0.00 386 -37.34 0.0684
2023-02-10 2022-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,199 -249 -1.61 616 20.55 0.1166
2022-10-24 2022-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,448 0 0.00 511 -6.07 0.1070
2022-07-29 2022-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,448 -5 -0.03 544 -23.49 0.1063
2022-05-17 2022-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,453 0 0.00 711 -30.63 0.1208
2022-01-19 2021-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,453 0 0.00 1,025 6.22 0.1797
2021-11-09 2021-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,453 0 0.00 965 -24.61 0.1873
2021-08-09 2021-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,453 364 2.41 1,280 27.87 0.2508
2021-04-29 2021-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,089 0 0.00 1,001 -13.56 0.2167
2021-01-28 2020-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,089 0 0.00 1,158 78.15 0.2694
2020-11-09 2020-09-30 13F ARROWHEAD PHARMACEUTICALS COM 04280A100 15,089 0 0.00 650 -0.31 0.1763
2020-08-14 2020-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,089 0 0.00 652 50.23 0.1829
2020-04-23 2020-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,089 0 0.00 434 -54.65 0.1506
2020-01-28 2019-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,089 89 0.59 957 126.24 0.2673
2019-10-23 2019-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 15,000 5,000 50.00 423 59.62 0.1288
2019-07-12 2019-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,000 0 0.00 265 44.02 0.0798
2019-05-01 2019-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,000 0 0.00 184 48.39 0.0574
2019-01-17 2018-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 10,000 10,000 124 0.0446
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.