LOS ANGELES, CA / ACCESSWIRE / May 22, 2023 / The Schall Law Firm, a national shareholder rights litigation firm, announces that it is investigating claims on behalf of investors of DoubleVerify Holdings, Inc. ("DoubleVerify" or "the Company") (NYSE: DV) for violations of the securities laws. The investigation focuses on whether the Company issued false and/or misleading statements and/or failed to disclose information pertinent to investors. DoubleVerify is the subject of a report released by...