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Twitter (ticker: TWTR) will ascend to the S&P 500, replacing Monsanto (MON), the S&P Dow Jones Indices said late Monday.

Netflix (NFLX) will replace Monsanto Company in the S&P 100.

The moves, effective Thursday, occurred as a result of Bayer AG's $62.5 billion acquisition of Monsanto.

Twitter shares are up 3.6%, to $39.24, in extended trading today.

UPDATE: Twitter shares improved 5% in early trading Tuesday. For the year, the company's stock is up 66.5%.

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