[SCHEDULE 13D/A] IMPINJ INC SEC Filing

Rhea-AI Filing Summary

Sylebra Capital and affiliated entities reported owning 1,829,260 shares of Impinj Inc. common stock, equal to 6.29% of the class. This filing is an amendment to a prior Schedule 13D and reflects a disposal of securities executed in the ordinary course of portfolio management. The filing names four reporting persons — Sylebra Capital LLC, Sylebra Capital Ltd, Sylebra Capital Management, Ltd and Daniel Patrick Gibson — and states that they share voting and dispositive power over the reported shares through affiliated investment entities. The amendment attaches a Joint Filing Agreement and otherwise leaves prior Schedule 13D disclosures unchanged.

Positive

• Clear disclosure of aggregate ownership: 1,829,260 shares representing 6.29% of common stock
• Amendment attaches a Joint Filing Agreement, clarifying coordination among reporting persons
• Transaction described as ordinary-course portfolio management, not linked to strategic change

Negative

• Disposition of shares occurred (the filing records a disposal), indicating the reporting group reduced its position
• Shared voting and dispositive power means influence is concentrated within affiliated entities and an individual (Daniel Patrick Gibson)

Insights

Financial Analyst

TL;DR: Reporting group holds 6.29% after an ordinary-course disposal; amendment discloses shared control across affiliated investment entities.

The filing provides a clear ownership snapshot: 1,829,260 shares (6.29%) held collectively by Sylebra entities and Daniel Gibson. The transaction is described as a disposal in the ordinary course of portfolio management, not tied to a strategic control change or new agreement with the issuer. For investors, the key takeaway is that an active investment manager with consolidated shared voting and dispositive power remains a meaningful shareholder but has recently reduced exposure.

Corporate Governance Expert

TL;DR: Amendment documents shared voting/dispositive power and a joint filing agreement, maintaining regulatory transparency.

The amendment confirms coordinated reporting and control through a Joint Filing Agreement (Exhibit 1) and explicitly states there are no other arrangements regarding voting, transfers or proxies. From a governance perspective, the disclosure preserves transparency about who can influence shareholder votes, and it confirms no disclosed side agreements or special voting arrangements beyond the shared authority described.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 4)

IMPINJ INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

453204109

(CUSIP Number)

Matthew Whitehead
3000 EL CAMINO REAL BUILDING 5 SUITE 450,
Palo Alto, CA, 94306
332-242-8518

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

09/10/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 453204109

1

Name of reporting person

SYLEBRA CAPITAL LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,829,260.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,829,260.00

11

Aggregate amount beneficially owned by each reporting person

1,829,260.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.29 %

14

Type of Reporting Person (See Instructions)

IA, HC

SCHEDULE 13D

CUSIP No. 453204109

1

Name of reporting person

Sylebra Capital Ltd

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

HONG KONG

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,829,260.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,829,260.00

11

Aggregate amount beneficially owned by each reporting person

1,829,260.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.29 %

14

Type of Reporting Person (See Instructions)

IA, HC

SCHEDULE 13D

CUSIP No. 453204109

1

Name of reporting person

Sylebra Capital Management, Ltd

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,829,260.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,829,260.00

11

Aggregate amount beneficially owned by each reporting person

1,829,260.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.29 %

14

Type of Reporting Person (See Instructions)

IA, HC

SCHEDULE 13D

CUSIP No. 453204109

1

Name of reporting person

Gibson Daniel Patrick

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

ANTIGUA AND BARBUDA

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,829,260.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,829,260.00

11

Aggregate amount beneficially owned by each reporting person

1,829,260.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.29 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock
(b)	Name of Issuer: IMPINJ INC
(c)	Address of Issuer's Principal Executive Offices: 400 FAIRVIEW AVENUE NORTH, SUITE 1200, SEATTLE, WASHINGTON , 98109.
Item 1 Comment: This Amendment on Schedule 13D/A amends the Schedule 13D filed by the Reporting Persons with the Securities and Exchange Commission on June 10, 2024, as amended from time to time (the "Schedule 13D"), relating to the shares of common stock, par value $0.001 per share ("Common Stock"), of Impinj, Inc.(the "Issuer"). The principal executive offices of the Issuer are located at: 400 Fairview Avenue North, Suite 1200, Seattle WA 98109. Except as specifically provided herein, this Amendment does not modify any of the information previously reported in the Schedule 13D. Unless otherwise indicated herein, capitalized terms used but not defined in this Amendment shall have the same meanings herein as are ascribed to such terms in the Schedule 13D.
Item 2.	Identity and Background
(a)	Sylebra Capital LLC ("Sylebra US") hereby files this Amendment on behalf of the Reporting Persons pursuant to the Agreement with Respect to Schedule 13D (the Joint Filing Agreement) attached to this Statement as Exhibit 1. Sylebra US and Sylebra Capital Limited ("Sylebra HK") are the investment sub-advisers to Sylebra Capital Partners Master Fund, Ltd. ("SCP MF"), Sylebra Capital Parc Master Fund ("PARC MF"), Sylebra Capital Menlo Master Fund ("MENLO MF") and other advisory clients. The term Affiliated Investment Entities refers to SCP MF, PARC MF, MENLO MF and the 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 the 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 the Affiliated Investment Entities. Sylebra US, Sylebra HK, Sylebra Cayman and Gibson are each referred to herein individually as a Reporting Person and collectively as the Reporting Persons.
(b)	SYLEBRA CAPITAL LLC - 3000 El Camino Real, Building 5, Suite 450, Palo Alto, CA 94306 Sylebra Capital Ltd - 20th Floor, 256 Hennessy Road, Wan Chai, Hong Kong Sylebra Capital Management, Ltd - c/o Walkers Corporate Limited, 190 Elgin Avenue, George Town Grand Cayman KY1-9008, Cayman Islands Gibson Daniel Patrick - 3000 El Camino Real, Building 5, Suite 450, Palo Alto, CA 94306
(c)	SYLEBRA CAPITAL LLC - Investment Sub-Adviser Sylebra Capital Ltd - Investment Sub-Adviser Sylebra Capital Management, Ltd - Investment Manager Gibson Daniel Patrick - (i) director and owner of Sylebra Capital Limited and Sylebra Capital Management and (ii) a sole member of Sylebra Capital LLC
(d)	SYLEBRA CAPITAL LLC - None Sylebra Capital Ltd - None Sylebra Capital Management, Ltd - None Gibson Daniel Patrick - None
(e)	SYLEBRA CAPITAL LLC - None Sylebra Capital Ltd - None Sylebra Capital Management, Ltd - None Gibson Daniel Patrick - None
(f)	SYLEBRA CAPITAL LLC - Delaware, US Sylebra Capital Ltd - Hong Kong Sylebra Capital Management, Ltd - Cayman Islands Gibson Daniel Patrick - Antiqua and Barbuda
Item 3.	Source and Amount of Funds or Other Consideration
	N/A as this was a disposal of securities.
Item 4.	Purpose of Transaction
	N/A as this was a disposal of securities. The disposal of shares was conducted in the ordinary course of portfolio management.
Item 5.	Interest in Securities of the Issuer
(a)	SYLEBRA CAPITAL LLC - 1,829,260; 6.29% Sylebra Capital Ltd - 1,829,260; 6.29% Sylebra Capital Management, Ltd - 1,829,260; 6.29% Gibson Daniel Patrick - 1,829,260; 6.29%
(b)	SYLEBRA CAPITAL LLC - 1,829,260 Sylebra Capital Ltd - 1,829,260 Sylebra Capital Management, Ltd - 1,829,260 Gibson Daniel Patrick - 1,829,260
(c)	N/A
(d)	No person other than the Reporting Persons has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Issuer's Common Stock.
(e)	N/A
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Except for the Joint Filing Agreement attached hereto as Exhibit 1, to the knowledge of the Reporting Persons, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the Reporting Persons or, to the knowledge of any of the Reporting Persons, any other person or entity referred to in Item 2, or between such persons and any other person, with respect to any securities of the Issuer, including, but not limited to, transfer or voting of any of the securities, finders fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies.
Item 7.	Material to be Filed as Exhibits.
	Exhibit 1 Joint Filing Agreement, dated as of September 12, 2025 by and among the Reporting Persons.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

SYLEBRA CAPITAL LLC

Signature:	/s/ Matthew Whitehead
Name/Title:	Matthew Whitehead, Authorized Signatory
Date:	09/12/2025

Sylebra Capital Ltd

Signature:	/s/ Matthew Whitehead
Name/Title:	Matthew Whitehead, Authorized Signatory
Date:	09/12/2025

Sylebra Capital Management, Ltd

Signature:	/s/ Matthew Whitehead
Name/Title:	Matthew Whitehead, Authorized Signatory
Date:	09/12/2025

Gibson Daniel Patrick

Signature:	/s/ Daniel Patrick Gibson
Name/Title:	Daniel Patrick Gibson, Individual
Date:	09/12/2025

FAQ

How many Impinj (PI) shares do Sylebra reporting persons own?

The filing reports 1,829,260 shares, equal to 6.29% of Impinj's common stock.

Did the Schedule 13D/A report a purchase or sale of PI shares?

The amendment states this filing reflects a disposal of securities executed in the ordinary course of portfolio management.

Which entities are listed as reporting persons on the PI Schedule 13D/A?

Sylebra Capital LLC, Sylebra Capital Ltd, Sylebra Capital Management, Ltd, and Daniel Patrick Gibson are named as reporting persons.

Do the reporting persons share voting or dispositive power over the PI shares?

Yes. The filing indicates shared voting power and shared dispositive power over the 1,829,260 shares.

Does the filing disclose any special agreements affecting voting or transfer of PI shares?

Other than the Joint Filing Agreement (Exhibit 1), the filing states there are no contracts, arrangements, or understandings regarding voting, transfer, proxies, or related matters.