Banks closed in these cities on Vinayaka (Ganesh) Chathurthi today, L&T s Rs 10,000 crore share buyback offer in Top News on September 18: Share markets, Bank Nifty outlook, CONCOR, Mastek, Texmaco Rail and Glenmark Pharma ex-dividend stocks, Madhusudan Masala IPO to open for subscription, iOS 17 and iPadOS 17 to roll out also in focus in top stories today.