Stock market holidays play a decisive role in shaping the trading activity, settlement cycles, and the pace at which the markets move. Since it is year-end, December is one of the busiest months. Any disruption due to stock exchange or bank holidays can impact fund transfers, margin additions, mutual fund orders, and delivery settlements.Here is a comprehensive look at all the stock market holidays and bank holidays, state-wise, that fall in December 2025 to save the market participants from delays or missed opportunities.Stock market holidays in December 2025Unlike other months that include several festival closures, December 2025 has only one stock market holiday. The National Stock Exchange (NSE), along with the Bombay Stock Exchange (BSE), will remain closed on Thursday, December 25, 2025, for Christmas. On this day, there will be no trading in the derivatives or equities markets.In the commodities market, MCX and the National Commodity & Derivatives Exchange (NCDEX) will remain closed for both morning and evening sessions.With Christmas Day falling on a Thursday, investors are advised to plan ahead, especially those who expect settlements, margin updates, or delivery-based trades during the preceding days leading up to that.Pro Tip: The year-end volatility, along with higher activity globally, may also impact liquidity; therefore, market participants should refrain from placing any time-sensitive orders or relying on fund transfers around this date.Bank holidays in December 2025In addition to stock market holidays, several regional and national holidays will be observed on several occasions by banks across India, apart from the usual second and fourth Saturdays, and Sundays off. This can impact the fund transfer for margin payments, SIP processing, IPO mandates, or equity settlement. DateHolidayAffected States / Pan-India?3rd DecemberFeast of St Francis XavierGoa5th DecemberSheikh Muhammad Abdullah JayantiJammu and Kashmir12th DecemberPa Togan Nengminza SangmaMeghalaya18th DecemberDeath Anniversary of U SoSo ThamMeghalaya19th DecemberLiberation DayGoa24th DecemberChristmas HolidayMeghalaya24th DecemberChristmas HolidayMizoram26th DecemberChristmas HolidayMeghalaya26th DecemberShaheed Udham Singh JayantiHaryana27th DecemberGuru Gobind Singh JayantiHaryana27th DecemberGuru Gobind Singh JayantiChandigarh27th DecemberGuru Gobind Singh JayantiChhattisgarh30th DecemberTamu LosarSikkim30th DecemberU Kiang NangbahMeghalaya31st DecemberNew Year’s EveManipur These being state-wise holidays, the impact varies from the investor’s bank and branch. Any holiday affecting your primary bank will delay the availability of funds for trades.Impact of bank holidays on stock market activityAlthough the stock exchanges operate independently from banking systems, bank holidays can still cause some practical disruptions for traders and investors. This includes:Delay in fund transfersNEFT and RTGS are not available on certain bank holidays, specifically in states where the bank branch remains closed. IMPS might also get delayed due to internal batch processing.Margin requirementsIf you need to add the margin to maintain open F&O positions, delays in bank transfers may trigger margin shortfalls, increasing the risk of auto-square-off.Mutual fund ordersMutual fund purchases, redemptions, and SIP debits are all linked to the timing of the settlement of funds. In case of a bank holiday, orders get executed on the next working day, thereby influencing the NAV allotment.IPO and NFO mandatesUPI authorisations or refunds may experience delays, especially when large volumes are processed at year-end.What should investors do?Investors can plan systematically to avoid disruptions during the December holidays, especially since the year is closing:Pre-fund accountsEnsure sufficient balance in trading and demat accounts a day in advance of the holiday to avoid margin shortfall or loss of buying opportunity.Avoid last-minute mutual fund ordersNAV cut-off timings shift to the next working day during bank holidays. Plan SIP or lump-sum transactions in advance.Complete IPO applications earlierUPI authorisations around holidays get delayed, so finishing them in advance results in less hindrance in the process.Monitor broker notificationsBrokers often release holiday schedules along with settlement advisories. These notifications assist investors in rescheduling trades with ease. Use UPI for smaller transfersUse UPI for smaller transfers. At times, even when banks are closed, UPI works for small transactions, thereby maintaining liquidity for the retail trader and investor. Final thoughtsDecember 2025 may have only one official stock market holiday, with numerous bank holidays varying according to different states. With Christmas falling mid-week and regional closures affecting fund flows, proactive planning helps ensure smooth stock market activity.By knowing the holiday calendar and planning well in advance, investors can plan their strategies and conduct trading effectively during this closing month of the financial year.