Another large investor has asked the New York Stock Exchange to force Sovereign Bancorp Inc. to submit two acquisition deals to a shareholder vote.

The California State Teachers’ Retirement System sent a letter Friday to Richard Ketchum, NYSE’s chief regulatory officer, objecting to Sovereign’s plans to sell a 19.8 percent stake to Spain’s Banco Santander Central Hispano SA for $2.4 billion, and then acquire Brooklyn, N.Y.-based Independence Community Bank Corp. for $3.6 billion in cash.