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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Thomas and Catharine Wilder Family Trust dated March 31, 2006."}],"balance_after":2613,"source":{"system":"sec-edgar","filing":"0001321732-18-000008","document":"wf-form4_151511638217921.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1491299/000132173218000008/wf-form4_151511638217921.xml","form_type":"4"}},{"id":4192162,"issuer":{"id":3430,"kind":"organization","name":"Penumbra Inc","symbol":"PEN"},"owners":[{"id":65893,"kind":"person","name":"Wilder Thomas","position":1,"cik":"0001491299","reported_name":"Wilder 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Stock","published_at":"2017-04-19T19:31:23.000Z","date":"2017-04-17","kind":"grant","acquired":true,"shares":1448,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Restricted stock units vest as to 1/4 on each of April 17, 2017, June 30, 2017, September 30, 2017 and December 31, 2017, subject to Mr. Wilder's continued service as a director through such dates."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"A portion of these shares is subject to vesting."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares are held by the Thomas and Catharine Wilder Family Trust dated March 31, 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2017, September 30, 2017 and December 31, 2017."}],"balance_after":2000,"source":{"system":"sec-edgar","filing":"0001321732-17-000006","document":"wf-form4_148435395909348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1491299/000132173217000006/wf-form4_148435395909348.xml","form_type":"4"}}]}