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

SCHEDULE 13G
Under the Securities Exchange Act of 1934

(Amendment No.__)*

¨ Rule 13d-1(b)

ý Rule 13d-1(c)

¨ Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in 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).

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Item 1(a).  Name of Issuer:

Impinj, Inc.

Item 1(b).  Address of Issuer’s Principal Executive Offices:

400 Fairview Avenue North, Suite 1200

Seattle, WA 98109

Item 2(a).  Names of Persons Filing:

Toronado Fund, L.P.

Toronado Partners LLC

Toronado Capital Management LLC

John Stephen Perkins

The principal business address of each reporting person is 44 Montgomery Street, Suite 1200, San Francisco, CA 94104.

Item 2(c).  Citizenship:

Reference is made to Item 4 of pages 2–5 of this Schedule 13G (this “Schedule”), which Items are incorporated by reference herein.

Item 2(d).  Title of Class of Securities:

Common Stock, $0.001 par value (the “Shares”)

Item 2(e).  CUSIP Number:

453204109

Item 3.      If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

¨     (a)    Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

¨     (b)    Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

¨     (c)    Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

¨     (d)    Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

¨     (e)    An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

¨     (f)    An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

¨     (g)    A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

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¨     (h)    A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

¨     (i)    A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the     Investment Company Act of 1940 (15 U.S.C. 80a-3);

¨     (j)    Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4.      Ownership.

Reference is hereby made to Items 5-9 of this Schedule, which Items are incorporated by reference herein.

Toronado Fund, L.P. directly holds 1,290,465 Shares. Toronado Partners LLC acts as investment manager for the Toronado Fund, L.P., Toronado Capital Management LLC acts as general partner for Toronado Fund, L.P., and John Stephen Perkins acts as Managing Member of Toronado Partners LLC.

Based upon the foregoing, as of the date hereof, each of Toronado Fund, L.P., Toronado Partners LLC, Toronado Capital Management LLC, and John Stephen Perkins (collectively, the “Reporting Persons”) may be deemed to be the beneficial owner of the number of Shares set forth in Item 9 of such Reporting Person’s cover page hereto. Each Reporting Person disclaims beneficial ownership of the Shares not held directly by such Reporting Person.

The calculation of percentage of beneficial ownership in item 11 was derived from Issuer’s quarterly report on Form 10-Q filed with the Securities and Exchange Commission on November 4, 2019, in which the Issuer stated that the number of Shares outstanding as of September 30, 2019 was 22,128,284.

Item 5.      Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  [  ].

Item 6.      Ownership of More than Five Percent on Behalf of Another Person.

To the best knowledge of the Reporting Persons, no one other than the Reporting Persons and the equityholders of 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 Shares.

Item 7.      Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

Not Applicable

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Item 8.      Identification and Classification of Members of the Group

The Reporting Persons have agreed to jointly file this Schedule 13G in accordance with Rule 13d-1(k) of the Exchange Act, the agreement with respect to which is attached hereto as Exhibit 1. Each Reporting Person expressly disclaims beneficial ownership with respect to any Shares other than the Shares owned of record by such Reporting Person.

Item 9.      Notice of Dissolution of Group

Not Applicable.

Item 10.      Certification

By signing below the undersigned certify that, to the best of their knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Signature

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