Arrowhead Pharmaceuticals, Inc.
US ˙ NasdaqGS ˙ US04280A1007

SecurityARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionNeuberger Berman Group LLC
Latest Disclosed Ownership203,914 shares
Latest Disclosed Value $ 12,785,408
Neuberger Berman Group LLC reports 103.13% increase in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On May 14, 2026 - Neuberger Berman Group LLC filed a 13F-HR form disclosing ownership of 203,914 shares of Arrowhead Pharmaceuticals, Inc. (US:ARWR) valued at $12,785,408 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 100,385 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of 103.13% during the quarter. The current value of the position is $14,904,074 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)
2026-05-14 2026-03-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 203,914 103,529 103.13 12,785 91.85 0.0050
2026-02-13 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 100,385 87,000 649.98 6,665 1,345.55 0.0050
2025-11-12 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 13,385 733 5.79 462 131.66 0.0003
2025-08-25 2025-06-30 13F/A-1 ARROWHEAD PHARMACEUTICALS IN Common 04280A100 12,652 12,652 200 0.0002
2025-08-13 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 12,652 12,652 200 0.0001
2025-02-13 2024-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 0 -187,806 -100.00 0 -100.00
2024-11-14 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 187,806 187,806 3,638 0.0028
2024-11-14 2024-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN Common 04280A100 0 -167,847 -100.00 0 -100.00
2024-05-13 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 0 -167,847 0
2024-11-14 2023-12-31 13F/A-2 ARROWHEAD PHARMACEUTICALS IN Common 04280A100 167,847 38,773 30.04 5,136 48.10 0.0045
2024-02-09 2023-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 167,847 38,773 5,136 0.0045
2023-11-14 2023-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 129,074 -94,852 -42.36 3,468 -56.57 0.0032
2023-08-11 2023-06-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 223,926 -22,264 -9.04 7,985 27.70 0.0071
2023-05-12 2023-03-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 246,190 39,147 18.91 6,253 -25.53 0.0058
2023-02-13 2022-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 207,043 -51,444 -19.90 8,398 -1.71 0.0082
2022-11-15 2022-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 258,487 9,935 4.00 8,543 -2.39 0.0089
2022-08-15 2022-06-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 248,552 -9,456 -3.67 8,752 -26.24 0.0088
2022-05-23 2022-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN Common 04280A100 258,008 -15,649 -5.72 11,866 -31.84 0.0101
2022-05-13 2022-03-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 258,008 -15,649 11,595 0.0052
2022-02-11 2021-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 273,657 -10,201 -3.59 17,409 1.32 0.0137
2021-11-12 2021-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 283,858 69,178 32.22 17,182 -0.35 0.0150
2021-08-13 2021-06-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 214,680 -30,000 -12.26 17,242 8.56 0.0150
2021-05-13 2021-03-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 244,680 55,214 29.14 15,882 11.96 0.0152
2021-02-10 2020-12-31 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 189,466 57,161 43.20 14,185 151.60 0.0147
2020-11-12 2020-09-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 132,305 50,609 61.95 5,638 62.81 0.0067
2020-08-13 2020-06-30 13F ARROWHEAD PHARMACEUTICALS IN Common 04280A100 81,696 81,696 3,463 0.0043
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.