Nifty expiry, Fed meet: Physicswallah, L&T, ICICI Bank, other stocks in focus.

• Nifty's weekly expiry and upcoming US Fed meeting are expected to bring volatility, following mixed global market trends.
• Physicswallah and Fujiyama Power Systems reported strong Q3 profit and revenue growth; M&M saw significant November sales and production increase.
• L&T approved transferring its realty business; Siemens to sell motor businesses for ₹2,200 cr.
• ICICI Bank to acquire 2% stake in ICICI Prudential AMC for ₹2,140 cr.
• Welspun Corp's subsidiary secured a ₹1,165 cr contract; IndiGo faces potential financial hit and DGCA fine due to flight disruptions.

Why It Matters: This story highlights key stocks and market events impacting investor decisions today.