NEWARK — Executives at two leading drug companies were among six people arrested Monday and charged with insider trading in what federal prosecutors said was a five-year scheme that netted more than $1 million.

Among those charged were John Lazorchak, 42, director of financial reporting at Celgene Corp., a biotech drug maker based in Summit, and Mark Cupo, 51, who held a similar position at Sanofi-Aventis, a France-based pharmaceutical company with US headquarters in Bridgewater.