Investing.com -- Shares of Apollo Global Management (NYSE: APO ) and Workday (NASDAQ: WDAY ) rose Monday after it was revealed the companies are set to join the S&P 500 , replacing Qorvo (NASDAQ: QRVO ) and Amentum Holdings, effective before market open on December 23.

Apollo is up more than 6% ahead of the open. So far this year, it has gained over 92%. Meanwhile, Workday has risen over 9% in premarket trading. It is down 2.7% this year.

The changes coincide with the quarterly rebalancing of the S&P Dow Jones Indices, aimed at better aligning companies with their respective market capitalization ranges.

Companies being added to the S&P 500 are deemed more indicative of the large-cap market space.

Qorvo and Amentum Holdings will move to the S&P SmallCap 600 , replacing Kelly Services (NASDAQ: KELYA ) and Service Properties (NASDAQ: SVC ) Trust.

Additional shifts include Comerica (NYSE: CMA ) and Carpenter Technology (NYSE: CRS ) moving from the S&P SmallCap 600 to the S&P MidCap 400, with Vishay Intertechnology (NYSE: VSH ) and Carter’s heading the opposite direction.

Market reaction to such moves is typically positive for companies added to the S&P 500, often leading to increased investor demand as index-tracking funds adjust their holdings.

Apollo and Workday’s inclusion is expected to enhance their visibility and attract a broader investor base.