SanDisk Corporation (NASDAQ: SNDK) delivered a powerful market performance on Monday, soaring 13.3% during regular trading and jumping another 9% after hours. The surge came after S&P Dow Jones Indices announced that the flash-memory leader will be added to the S&P 500 index. SanDisk is set to replace Interpublic Group of Companies Inc. (NYSE: IPG), which is being acquired by Omnicom Group Inc. (NYSE: OMC). The index adjustment becomes effective before the market opens on Friday, November 28.
Investor enthusiasm surrounding SanDisk has been building throughout the month. On November 6, the company reported quarterly earnings that exceeded both revenue and profit expectations, reinforcing confidence in its growth trajectory. The momentum intensified on Monday after Morgan Stanley analyst Joseph Moore boosted his price target on SanDisk to $273 from $263 while reiterating an Overweight rating. This optimistic outlook contributed to stronger trading activity and renewed interest in SanDisk stock, particularly as its inclusion in the S&P 500 positions it for increased visibility among institutional investors and index-tracking funds.
The index reshuffling also affected several other companies. PTC Therapeutics Inc. (NASDAQ: PTCT) will take SanDisk’s former spot in the S&P SmallCap 600, prompting a 4% rise in its shares during after-hours trading. Upwork Inc. (NASDAQ: UPWK) climbed 5.7% after being selected to replace Premier Inc. (NASDAQ: PINC) in the SmallCap 600. Premier is set to be acquired by Patient Square Capital, with the deal expected to close on November 25. First Interstate BancSystem Inc. (NASDAQ: FIBK) also gained 4.8% following news it will replace Hanesbrands Inc. (NYSE: HBI), which is being acquired by Gildan Activewear Inc. (NYSE: GIL) in a transaction anticipated to finalize on December 1.
Overall, the latest S&P index updates sparked notable market reactions, with SanDisk leading the rally as investors respond to its strong earnings, bullish analyst sentiment, and upcoming inclusion in the S&P 500.


Dell Raises 2027 Revenue Forecast as AI Server Demand Drives Record Quarterly Results
Samsung Union Dispute Escalates Over Semiconductor Bonus Vote
Australia Sues 3M for Over A$2 Billion Over PFAS Firefighting Foam Contamination
Snowflake Stock Soars 30% After Q1 Earnings Beat and Major AWS AI Partnership
Marvell Stock Rises After Record Q1 FY2027 Earnings Fueled by AI Demand
Synopsys Q2 FY2026 Earnings Beat Driven by AI and Semiconductor Demand
Xiaomi Shares Drop After Weak Q1 Earnings Amid Rising Smartphone Costs
HP Q2 2026 Earnings Beat Expectations Despite Memory Chip Pressure
SpaceX Delays Starship V3 Launch Ahead of Potential Record IPO
SpaceX IPO Could Become Largest in History with $1.8 Trillion Valuation Target
NIO CEO Says China’s Auto Industry Has Passed Its Golden Era Amid Weak Car Sales
European EV Sales Surge in April 2026 as Tesla and Chinese Automakers Gain Ground
JPMorgan Sees Biotech Sector at Turning Point, Upgrades Top Pharma Stocks
MongoDB Q1 FY2027 Earnings Beat Expectations, Raises Full-Year Outlook
Samsung to Invest $1.5 Billion in Vietnam Semiconductor Testing Plant by 2027
PDG Explores $1 Billion Sale of China Data Center Assets 



