Arrowhead COO O'Brien Gets 75,000 RSUs, Gifts Stock

Q: How many Arrowhead (ARWR) shares did the COO gift, and to whom?

The Form 4 shows five separate "G" transactions for 540, 540, 540, 440 and 440 shares of Arrowhead common stock, totaling 2,500 shares, described as a gift to relatives at a price of $0 per share.

Q: What is the structure of the 75,000 Arrowhead (ARWR) RSUs granted to the COO?

The filing states that 75,000 shares represent restricted stock units that will vest in four equal annual installments, meaning one quarter of the units is scheduled to vest each year over four years.

Q: How many Arrowhead (ARWR) shares does the COO beneficially own after these transactions?

Following the reported transactions, Patrick O'Brien beneficially owned 547,408 shares of Arrowhead common stock directly, including previously reported shares underlying RSUs, some of which are still subject to vesting conditions.

Q: Are the COO’s Arrowhead (ARWR) holdings direct or indirect after these trades?

The Form 4 reports that, after the transactions, 547,408 shares of Arrowhead common stock are held with an ownership form of Direct (D), with no separate nature of indirect beneficial ownership disclosed.

Arrowhead Pharmaceuticals COO Patrick O'Brien reported several stock gifts and a new equity award.

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Rhea-AI Filing Summary

Arrowhead Pharmaceuticals COO Patrick O'Brien reported several stock gifts and a new equity award. On January 6, 2026, he made multiple transactions coded "G" that transferred a total of 2,500 shares of common stock as a gift to relatives at a price of $0 per share, reducing his holdings stepwise in small blocks.

On the same date, he acquired 75,000 shares of common stock coded "A", representing shares underlying restricted stock units (RSUs) that will vest in four equal annual installments. After these transactions, he beneficially owned 547,408 shares of Arrowhead common stock directly, which includes previously reported RSUs, some of which remain subject to vesting conditions.

Insider Trade Summary

2,500 shares gifted

Gift 6 txns

Insider O'Brien Patrick

Role COO

Type	Security	Shares	Price	Value
Gift	Common Stock	540	$0.00	$0.00
Gift	Common Stock	540	$0.00	$0.00
Gift	Common Stock	540	$0.00	$0.00
Gift	Common Stock	440	$0.00	$0.00
Gift	Common Stock	440	$0.00	$0.00
Grant/Award	Common Stock	75,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 547,408 shares (Direct)

Footnotes (3)

F1. Gift to relatives
F2. Includes previously reported shares of common stock underlying Restricted Stock Units granted to the Reporting person, a portion of which are still subject to certain vesting conditions.
F3. Represents shares underlying restricted stock units which will vest in four equal annual installments.

FAQ

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What insider transactions did Arrowhead (ARWR) COO Patrick O'Brien report?

Patrick O'Brien reported several transactions in Arrowhead common stock on January 6, 2026, including multiple gifts totaling 2,500 shares and the acquisition of 75,000 shares underlying new restricted stock units.

How many Arrowhead (ARWR) shares did the COO gift, and to whom?

The Form 4 shows five separate "G" transactions for 540, 540, 540, 440 and 440 shares of Arrowhead common stock, totaling 2,500 shares, described as a gift to relatives at a price of $0 per share.

What is the structure of the 75,000 Arrowhead (ARWR) RSUs granted to the COO?

The filing states that 75,000 shares represent restricted stock units that will vest in four equal annual installments, meaning one quarter of the units is scheduled to vest each year over four years.

How many Arrowhead (ARWR) shares does the COO beneficially own after these transactions?

Following the reported transactions, Patrick O'Brien beneficially owned 547,408 shares of Arrowhead common stock directly, including previously reported shares underlying RSUs, some of which are still subject to vesting conditions.

Are the COO’s Arrowhead (ARWR) holdings direct or indirect after these trades?

The Form 4 reports that, after the transactions, 547,408 shares of Arrowhead common stock are held with an ownership form of Direct (D), with no separate nature of indirect beneficial ownership disclosed.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 01/08/2026 - 06:45 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

O'Brien Patrick

(Last)

(First)

(Middle)

177 E. COLORADO BLVD

SUITE 700

(Street)

PASADENA

91105

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
ARROWHEAD PHARMACEUTICALS, INC. [ ARWR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	COO

3. Date of Earliest Transaction (Month/Day/Year)
01/06/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	01/06/2026		G⁽¹⁾		540	D	$0	474,368⁽²⁾	D
Common Stock	01/06/2026		G⁽¹⁾		540	D	$0	473,828⁽²⁾	D
Common Stock	01/06/2026		G⁽¹⁾		540	D	$0	473,288⁽²⁾	D
Common Stock	01/06/2026		G⁽¹⁾		440	D	$0	472,848⁽²⁾	D
Common Stock	01/06/2026		G⁽¹⁾		440	D	$0	472,408⁽²⁾	D
Common Stock	01/06/2026		A		75,000⁽³⁾	A	$0	547,408⁽²⁾	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Gift to relatives

2. Includes previously reported shares of common stock underlying Restricted Stock Units granted to the Reporting person, a portion of which are still subject to certain vesting conditions.

3. Represents shares underlying restricted stock units which will vest in four equal annual installments.

Remarks:

	/s/Patrick O'Brien	01/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source: View Original Filing on SEC EDGAR