[Form 4] IMPINJ INC Insider Trading Activity

Rhea-AI Filing Summary

Impinj, Inc. (PI) had a group of affiliated investment entities and their principal file a Form 4 reporting open‑market sales of its common stock. On 11/20/2025, they reported selling 8,081 shares at an average price of $156.3249 per share. On 11/21/2025, they reported selling an additional 3,046 shares at an average price of $155.0973 per share.

Following these transactions, the group reported 1,753,445 shares of Impinj common stock beneficially owned in an indirect capacity. The filing explains that various Sylebra entities act as investment managers or advisers to funds that hold the shares and that Daniel Patrick Gibson controls those entities. The reporting persons state they may be deemed to share voting and dispositive power over the shares but disclaim beneficial ownership beyond any pecuniary interest.

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

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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^*

SYLEBRA CAPITAL LLC

(Last) (First) (Middle)

3000 EL CAMINO REAL BUILDING 5 SUITE 450

(Street)

PALO ALTO CA 94306

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
IMPINJ INC [ PI ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
11/20/2025

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

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

	Form filed by One Reporting Person
X	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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/20/2025		S		8,081	D	$156.3249	1,756,491	I	See Footnote(1)(2)
Common Stock	11/21/2025		S		3,046	D	$155.0973	1,753,445	I	See Footnote(1)(2)

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

SYLEBRA CAPITAL LLC

(Last) (First) (Middle)

3000 EL CAMINO REAL BUILDING 5 SUITE 450

(Street)

PALO ALTO CA 94306

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

Gibson Daniel Patrick

(Last) (First) (Middle)

400 FAIRVIEW AVENUE NORTH, SUITE 1200

(Street)

SEATTLE WA 98109

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. Sylebra Capital Limited (Sylebra HK) and Sylebra Capital LLC (Sylebra US) are the investment sub-advisers to Sylebra Capital Partners Master Fund, Ltd. (SCP MF),Sylebra Capital Menlo Master Fund (MENLO MF)and other advisory clients. Sylebra Capital Management (Sylebra Cayman) is the investment manager and parent of Sylebra HK.Sylebra Cayman owns 100% of the shares of Sylebra HK, and Daniel Patrick Gibson (Gibson) owns 100% of Class A shares of Sylebra Cayman and 100% of the share capital of Sylebra US. Gibson is a founder and Chief Investment Officer of Sylebra Cayman. In such capacities, Sylebra HK, Sylebra US, Sylebra Cayman and Gibson may be deemed to share voting and dispositive power over the shares of common stock of the Issuer held by SCP MF, MENLO MF, and other advisory clients.

2. These securities are held by SCP MF, MENLO MF, and/or other advisory clients. Gibson is a member of the board of directors of the Issuer. Sylebra HK, Sylebra US, Sylebra Cayman and Gibson disclaim beneficial ownership of these securities, and this report shall not be deemed an admission that Sylebra HK, Sylebra US,Sylebra Cayman and Gibson are the beneficial owners of such securities, except to the extent of their pecuniary interest, if any, therein.

	Matthew Whitehead, CCO, Authorsied Signatory	11/24/2025
	** 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.

FAQ

What did Impinj (PI) insiders report in this Form 4 filing?

The filing reports that affiliated investment entities tied to Sylebra and their principal disclosed sales of Impinj (PI) common stock in open‑market transactions and updated their indirect beneficial ownership position.

How many Impinj (PI) shares were sold and on what dates?

The reporting persons disclosed selling 8,081 shares of Impinj common stock on 11/20/2025 and 3,046 shares on 11/21/2025, for a total of 11,127 shares.

At what prices were the Impinj (PI) shares sold in this Form 4?

The 8,081 shares sold on 11/20/2025 were at an average price of $156.3249 per share, and the 3,046 shares sold on 11/21/2025 were at an average price of $155.0973 per share.

How many Impinj (PI) shares do the reporting persons show as beneficially owned after the sales?

After the reported transactions, the filing lists 1,753,445 Impinj common shares as beneficially owned indirectly by the reporting persons.

Who are the entities involved in this Impinj (PI) Form 4 filing?

The response explains that Sylebra Capital Limited, Sylebra Capital LLC, Sylebra Capital Management, and funds such as Sylebra Capital Partners Master Fund, Ltd. and Sylebra Capital Menlo Master Fund are involved, with Daniel Patrick Gibson controlling key Sylebra entities.

Do the Sylebra entities and Daniel Gibson claim full beneficial ownership of the Impinj (PI) shares?

No. The filing states that Sylebra entities and Daniel Patrick Gibson may be deemed to share voting and dispositive power over the shares but disclaim beneficial ownership except to the extent of any pecuniary interest.

What is the relationship of Daniel Patrick Gibson to Impinj (PI)?

The explanation notes that Daniel Patrick Gibson is a member of the Impinj board of directors and a founder and Chief Investment Officer of Sylebra Capital Management.