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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
879407	Arrowhead Pharmaceuticals Inc.	ARWR	Pharmaceutical Preparations (2834)	460408024

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1486672	Allen Kenneth Myszkowski	177 E. Colorado Blvd Suite 700 Pasadena CA 91105	Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2020-10-20	29,166	$6.15	456,834	No	4	M	Direct
Common Stock	Disposition	2020-10-20	29,166	$54.04	427,668	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2020-10-20	29,166	$0.00	29,166	$6.15

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
43,505	2016-02-01	2026-01-01	No	4	M	Direct

Footnotes

Open market sale pursuant to a 10b5-1 trading plan adopted by the Reporting Person in accordance with Rule 10b5-1 of the SecuritiesExchange Act of 1934, as amended.
The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $54.00 to$54.07, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of ArrowheadPharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of sharessold at each separate price within the ranges set forth in this footnote of this Form 4.
Represents the first vesting date. Option vested over four years from date of grant.