NEW YORK—A U.S. regulator on Wednesday charged a former Goldman Sachs Group Inc. senior compliance analyst with insider trading, saying he made illegal trades involving banking clients while working in Warsaw, Poland. The U.S. Securities and Exchange Commission (SEC) said Jose Luis Casero Sanchez, 35, of Spain, learned material non-public information about his employer’s clients through his work in a “control room” that tracked pending mergers, acquisitions, and financings. Casero’s duties included updating the bank’s confidential “Grey List,” which tracked clients involved in such transactions, according to an SEC complaint filed with the U.S. District Court in Manhattan. The regulator said Casero used brokerage accounts opened in his parents’ names to trade ahead of significant transactions at least 45 times from September 2020 until his May 2021 resignation, reaping nearly $472,000 of profit. Wednesday’s lawsuit does not identify Goldman by name, but identified Goldman clients in whose stocks Casero allegedly …