Arrowhead Pharmaceuticals, Inc.
MX ˙ BMV ˙ US04280A1007
SecurityMX:ARWR / Arrowhead Pharmaceuticals, Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership9,630 shares
Latest Disclosed Value $ 603,801
Quadrant Capital Group Llc reports 132.50% increase in ownership of ARWR / Arrowhead Pharmaceuticals, Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 9,630 shares of Arrowhead Pharmaceuticals, Inc. (MX:ARWR) valued at $603,801 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,142 shares of Arrowhead Pharmaceuticals, Inc.. This represents a change in shares of 132.50% 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)
2026-05-13 2026-03-31 13F/A-1 ARROWHEAD PHARMACEUTICALS IN COM 04280A100 9,630 5,488 132.50 604 120.07 0.0181
2026-05-11 2026-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 9,630 5,488 49 0.0369
2026-02-12 2025-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 4,142 75 1.84 275 95.71 0.0083
2025-11-13 2025-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 4,067 4,067 140 0.0046
2025-08-13 2025-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 0 -19,169 -100.00 0 -100.00
2025-05-13 2025-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 19,169 18,165 1,809.26 244 1,255.56 0.0091
2025-02-13 2024-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 1,004 202 25.19 19 20.00 0.0013
2024-11-12 2024-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 802 392 95.61 16 50.00 0.0011
2024-08-12 2024-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 410 148 56.49 11 42.86 0.0008
2024-05-15 2024-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 262 23 9.62 7 0.00 0.0006
2024-02-08 2023-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 239 -171 -41.71 7 -36.36 0.0006
2023-11-14 2023-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 410 -343 -45.55 11 -57.69 0.0011
2023-08-10 2023-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 753 -99 -11.62 27 23.81 0.0027
2023-05-11 2023-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 852 -130 -13.24 22 -46.15 0.0023
2023-02-13 2022-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 982 505 105.87 40 143.75 0.0045
2022-11-10 2022-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 477 275 136.14 16 128.57 0.0021
2022-08-09 2022-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 202 -12 -5.61 7 -30.00 0.0009
2022-05-06 2022-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 214 -236 -52.44 10 -66.67 0.0012
2022-02-01 2021-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 450 143 46.58 30 57.89 0.0036
2021-11-12 2021-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 307 9 3.02 19 -24.00 0.0027
2021-08-09 2021-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 298 -114 -27.67 25 -7.41 0.0036
2021-05-12 2021-03-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 412 8 1.98 27 -12.90 0.0044
2021-02-16 2020-12-31 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 404 150 59.06 31 181.82 0.0058
2020-11-13 2020-09-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 254 24 10.43 11 10.00 0.0024
2020-08-13 2020-06-30 13F ARROWHEAD PHARMACEUTICALS IN COM 04280A100 230 187 434.88 10 900.00 0.0022
2020-05-15 2020-03-31 13F Arrowhead Pharmaceuticals Com 04280A100 43 -331 -88.50 1 -95.24 0.0002
2020-03-19 2019-12-31 13F/A-1 Arrowhead Pharmaceuticals Com 04280A100 374 267 249.53 21 950.00 0.0025
2020-02-03 2019-12-31 13F Arrowhead Pharmaceuticals Com 04280A100 374 267 21 70.9617
2019-10-24 2019-09-30 13F Arrowhead Pharmaceuticals COM 04280A100 107 51 91.07 2 100.00 0.0003
2019-07-24 2019-06-30 13F Arrowhead Pharmaceuticals COM 04280A100 56 56 1 0.0002
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.