front-run
v. phr.— «Prosecutors allege day traders would buy or sell shares in advance of anticipated price movements, generating more than $600,000 in profits between January 2002 and February 2004. Mahaffy said no one ever told him they were using the information to front-run, as the practice is called.» —“Ex-Merrill Broker Denies Giving Clients ‘Squawk Box’ Access ” by Karen Freifeld Bloomberg Apr. 24, 2007. (source: Double-Tongued Dictionary)