 LEXINGTON, Mass., July 1, 2021 PRNewswire -- iSpecimen Inc. Nasdaq: ISPC iSpecimen or the Company, an online marketplace for human biospecimens, today announced the closing of the issuance of an additional 337,500 shares of its common stock pursuant to the full exercise of the underwriters over-allotment option in connection with the Companys initial public offering the IPO. 