PRLB Investors Have Opportunity to Join Proto Labs, Inc. Fraud Investigation with the Schall Law Firm PR Newswire LOS ANGELES, Aug. 7, 2024 LOS ANGELES , Aug. 7, 2024 /PRNewswire/ -- The Schall Law Firm , a national shareholder rights litigation firm, announces that it is investigating claims on behalf of investors of Proto Labs, Inc. (" Proto Labs " or "the Company") (NYSE: PRLB ) for violations of the securities laws. The investigation focuses on whether the Company issued false and/or...