AES Corp's stock experienced a significant pre-market decline of 17.25% on Monday. The sharp drop occurred shortly after the market opened for pre-market trading.

The movement is directly linked to the announcement that a consortium led by Global Infrastructure Partners and EQT has agreed to acquire AES. The deal is valued at $10.7 billion in equity and $33.4 billion in enterprise value. Market reaction suggests the terms may have fallen short of investor expectations, leading to the sell-off.

In related analyst action, Seaport Research Partners raised its rating on AES Corp to Neutral from Sell, a move that was published prior to the acquisition news. This upgrade, however, was overshadowed by the market's response to the acquisition details.