 NEW YORK , July 10, 2021 PRNewswire -- Halper Sadeh LLP, a global investor rights law firm, announces it is investigating the following companies: Stamps.com Inc. NASDAQ: STMP concerning potential violations of the federal securities laws andor breaches of fiduciary duties relating to its sale to Thoma Bravo for 330.00 per share in cash. If you are a Stamps.com shareholder, click here to learn more about your rights and options. 