{"url_path":"/sec/ispc/proxy/2026-05-18/000121390026058184","section_key":"body","section_title":"DEFA14A body","topic":"sec","document":{"doc_type":"DEFA14A","doc_date":"2026-05-18","source_url":"https://www.sec.gov/Archives/edgar/data/1558569/0001213900-26-058184-index.html","accession_number":"0001213900-26-058184","cik":"0001558569","ticker":"ISPC","issuer_name":"iSpecimen Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1558569/0001213900-26-058184-index.html","primary_entity_key":"0001558569","primary_entity_name":"iSpecimen Inc."},"word_count":469,"has_tables":true,"body_markdown":"DEFA14A\n1\nea0291160-defa14a_ispecimen.htm\nDEFINITIVE ADDITIONAL MATERIALS\n\n**UNITED STATES\nSECURITIES AND EXCHANGE COMMISSION\nWashington, D.C. 20549**\n\n**SCHEDULE 14A INFORMATION**\n\n**Proxy Statement Pursuant to Section 14(a) of\nthe\nSecurities Exchange Act of 1934**\n\nFiled by the Registrant\n\n☒\n\nFiled by a Party other than the Registrant\n\n☐\n\nCheck the appropriate box:\n\n☐\nPreliminary Proxy Statement\n\n☐\nConfidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))\n\n☐\nDefinitive Proxy Statement\n\n☒\nDefinitive Additional Materials\n\n☐\nSoliciting Material Pursuant to § 240.14a-12\n\n**iSpecimen Inc.**(Name of Registrant as Specified in its Charter)\n\nN/A\n\n(Name of Person(s) Filing Proxy Statement, if other than the Registrant)\n\nPAYMENT OF FILING FEE (Check the appropriate box):\n\n☒\nNo fee required.\n\n☐\nFee paid previously with preliminary materials.\n\n☐\nFee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.\n\nOn May 18, 2026, iSpecimen Inc., a Delaware corporation\n(the “Company”), is sending the following letter to stockholders in connection with the Company’s 2025 Annual Meeting\nof Stockholders (the “Annual Meeting”). The definitive proxy statement for the Annual Meeting was filed with the Securities\nand Exchange Commission on November 21, 2025.\n\n***\n\n2\n\nMay 18, 2026\n\nDear Fellow iSpecimen Stockholders,\n\nOur Annual Meeting, originally scheduled for December\n31, 2025, has been adjourned once again to May 29, 2026 at 9 am EST due to a lack of quorum. To date, we have not received your vote,\nso please take the time to cast your vote today and help us avoid further expenses associated with this meeting. The items on the ballot\ninclude the election of one director, Arphing (Tommy) Lee, for a 3-year term expiring at the 2028 annual meeting, ratification of Bush\n& Associates CPA LLC as our independent registered public accounting firm for the year ending December 31, 2025, approval of the iSpecimen\nInc. 2025 Stock Incentive Plan, and transaction of such other business that may come before the meeting.\n\n**Your Board of Directors recommends that\nstockholders vote “FOR” all proposals outlined in the proxy materials previously provided to you.**\n\n** **\n\nRegardless of the number of shares you own, your\nvote is very important. Whether or not you plan to attend the meeting, we encourage you to vote as soon as possible to ensure that your\nshares are represented. Even if you have since sold your shares, you still have the right to vote as a holder of record on November 3,\n2025.\n\nVoting is quick and easy. You may vote by any\nof the following methods:\n\n●Online: www.proxyvote.com\n\n●Telephone: 800-454-8683\n\nIf you have already voted your shares, please\naccept our sincere thanks and disregard this reminder. If you have any questions or need assistance voting your shares, please call (877)\n598-6925.\n\nThank you for your continued support and participation.\n\nSincerely,\n\n/s/ Katharyn Field\n\nKatharyn Field\n\nChief Executive Officer\n\n3"}