Movers & Shakers: PacWest leads regional bank rally. Berkshire Hathaway, Dish, AMC, Tyson and other stocks on the move.

Here are some stocks that were among the more active and more prominent movers early Monday.

Stock gainers:

PacWest Bancorp.’s stock PACW rose 33% early Monday, in a continued positive response to the news it was reducing its dividend. The Beverly Hills, Calif.-based lender said current economic uncertainty, recent volatility in the banking…