[Form 4] Impinj, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Chris Diorio, Ph.D., CEO and director of Impinj, Inc. (PI), reported the sale of 10,000 shares of Impinj common stock under a Rule 10b5-1 trading plan effective May 28, 2025. The Form 4 shows multiple off‑market sales on September 8–9, 2025 with weighted‑average prices reported across several price bands from about $190.19 to $198.05. After the reported dispositions, Dr. Diorio is shown as beneficially owning 336,109 shares directly and 199,362 shares indirectly through DFT L.L.C., according to the filing.

Positive

• Sales were executed under a Rule 10b5-1 trading plan, which typically indicates preplanned transactions rather than opportunistic insider sales
• Filing discloses post-transaction ownership: 336,109 shares directly and 199,362 shares indirectly, showing continued insider alignment with shareholders
• Detailed explanatory footnotes provide price ranges and a willingness to supply granular trade data on request, supporting transparency

Negative

• Insider disposed of 10,000 shares, which represents a reduction in the reporting person’s direct holdings
• Multiple sales over two days may attract investor attention despite being under a 10b5-1 plan

Insights

Securities Analyst

TL;DR: Insider sold 10,000 shares under a preexisting 10b5-1 plan; holdings remain sizeable, so market impact is likely limited.

The Form 4 documents planned sales executed under a Rule 10b5-1 plan, which reduces the likelihood these transactions reflect new, undisclosed company information. The filing reports aggregate disposals of exactly 10,000 shares across September 8–9, 2025, with weighted‑average prices disclosed in grouped ranges. Post‑sale ownership remains significant with 336,109 shares held directly and 199,362 shares held indirectly via DFT L.L.C., indicating continued insider exposure to company performance. From a trading‑signal perspective, rule‑plan sales are typically treated as neutral by investors, though the size and timing relative to company or sector events could attract attention.

Corporate Governance Expert

TL;DR: Sales were executed pursuant to a Rule 10b5-1 plan; disclosure is compliant and granular price ranges are provided.

The filing discloses that the sales were effected pursuant to a 10b5-1 trading plan effective May 28, 2025, and includes explanatory footnotes that give price ranges for each aggregated sale grouping. The report is signed by an attorney‑in‑fact and lists the reporting person as both an officer (CEO) and director. Disclosure of both direct and indirect beneficial ownership (including 199,362 shares held by DFT L.L.C.) aligns with standard reporting practices. Governance observers will note transparency in the explanation of aggregated weighted‑average prices and the pledge to provide granular trade details upon request.

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).

X

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^*

DIORIO CHRIS PH.D.

(Last) (First) (Middle)

400 FAIRVIEW AVENUE NORTH

SUITE 1200

(Street)

SEATTLE WA 98109

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2025

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/08/2025		S(1)		1,893	D	$191.8135(2)	344,216	D
Common Stock	09/08/2025		S(1)		3,007	D	$192.5768(3)	341,209	D
Common Stock	09/08/2025		S(1)		100	D	$193.295	341,109	D
Common Stock	09/09/2025		S(1)		330	D	$190.4208(4)	340,779	D
Common Stock	09/09/2025		S(1)		199	D	$191.3049(5)	340,580	D
Common Stock	09/09/2025		S(1)		510	D	$192.8366(6)	340,070	D
Common Stock	09/09/2025		S(1)		1,332	D	$194.1755(7)	338,738	D
Common Stock	09/09/2025		S(1)		1,120	D	$195.0997(8)	337,618	D
Common Stock	09/09/2025		S(1)		249	D	$196.3365(9)	337,369	D
Common Stock	09/09/2025		S(1)		790	D	$197.2273(10)	336,579	D
Common Stock	09/09/2025		S(1)		303	D	$197.8602(11)	336,276	D
Common Stock	09/09/2025		S(1)		167	D	$199.77	336,109	D
Common Stock								199,362	I	by DFT L.L.C.

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

Explanation of Responses:

1. The sales reported by Dr. Diorio were effected pursuant to a Rule 10b5-1 trading plan effective on May 28, 2025.

2. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $191.17 to $192.15, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

3. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $192.17 to $193.00, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

4. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $190.19 to $190.83, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

5. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $191.25 to $191.37, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

6. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $192.455 to $193.28, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

7. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $193.635 to $194.62, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

8. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $194.71 to $195.6975, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

9. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $195.75 to $196.60, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

10. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $196.76 to $197.75, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

11. The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $197.78 to $198.05, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

	/s/ Yukio Morikubo, Attorney in fact for Chris Diorio	09/09/2025
	** 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 CEO Chris Diorio (PI) report on the Form 4?

The filing reports the sale of 10,000 shares of Impinj common stock executed on September 8–9, 2025 under a Rule 10b5-1 trading plan.

Were the sales planned or opportunistic?

The Form 4 states the sales were effected pursuant to a Rule 10b5-1 trading plan effective May 28, 2025, indicating preplanned transactions.

How many shares does Chris Diorio own after the reported transactions?

Following the reported transactions, the filing shows 336,109 shares directly owned and 199,362 shares indirectly owned via DFT L.L.C.

What prices were the shares sold at?

The filing reports aggregated weighted‑average prices and discloses that sales occurred across multiple price ranges approximately between $190.19 and $198.05, with more granular breakdowns provided in explanatory notes.

Who signed the Form 4?

The Form 4 was signed by Yukio Morikubo, Attorney‑in‑fact for Chris Diorio on September 9, 2025.