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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q ( Mark One ) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Commission File Number : 001-37557 to Delaware ( State or other jurisdiction of incorporation or organization ) Penumbra , Inc. ( Exact name of registrant as specified in its charter ) 05-0605598 ( I.R.S. Employer Identification No. ) Title of each class Common Stock , Par value $ 0.001 per share One Penumbra Place Alameda , CA 94502 ( Address of principal executive offices , including zip code ) ( 510 ) 748-3200 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol PEN Name of each exchange on which registered The New York Stock Exchange Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes : > No : ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( $ 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes : ☑No : □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer a smaller reporting company or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , ” “ smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer Emerging growth company ☑ × ☐ ☐ Accelerated filer Smaller reporting company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . o Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes : ☐ No : ☑ ☐ ☐ As of October 21 , 2021 , the registrant had 37,358,765 shares of common stock , par value $ 0.001 per share , outstanding .