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The lot size of all the Bank Nifty Contracts expiring on or after 30th July 2020 has been changed from 20 contracts to 25 contracts. In other words, this means that the lot of Bank Nifty has increased by 25% after July 2020. (Source: NSE Circular)

Let us understand what it means with an example. Assume, if a particular strike Price of Bank Nifty Option was Price at 50 units of Premium. Here, the margin required under the old format was = 50 * 20 = Rs. 1,000. However, under the new contract size, the margin required will be = 50 * 25 = Rs. 1,250

Along with the change in lot size for Bank Nifty, the lot size for 78 other stock F&O contracts has also been revised. The list is as follows:

SymbolPresent lot sizeRevised lot size
ACC400500
AMARAJABAT8001000
AMBUJACEM25003000
APOLLOTYRE30005000
ASHOKLEY80009000
AUROPHARMA10001300
BANDHANBNK12001800
BANKBARODA54008200
BEL60007600
BHARATFORG13001500
BHEL1040021000
INFRATEL20002800
BOSCHLTD4050
CANBK26005000
CENTURYTEX6001400
CIPLA11501300
COALINDIA27003700
CUMMINSIND9001200
EICHERMOT3035
EQUITAS49007600
EXIDEIND29003600
GAIL53346100
GLENMARK14002300
GODREJCP8001000
GRASIM750950
HDFCBANK500550
HDFCLIFE9001100
HEROMOTOCO200300
HINDALCO35004300
HINDPETRO21002700
HDFC250300
IDFCFIRSTB1200019000
IBULHSGFIN12003100
IOC40005700
INDUSINDBK400800
NAUKRI200250
INDIGO300500
ITC24003200
JSWSTEEL23002700
L&TFH56006800
LT375550
LICHSGFIN13002000
LUPIN700850
M&MFIN16002100
M&M10001400
MARICO13002000
MOTHERSUMI50007000
NATIONALUM1170017000
NCC900021000
NMDC60006700
NTPC48005700
ONGC41007700
PAGEIND2530
PEL309550
PNB830014000
RBLBANK15002600
SRTRANSFIN600650
SAIL1570019000
SUNPHARMA12501400
SUNTV12001500
TATACHEM9002000
TCS250300
TATAMOTORS43005700
TATAPOWER900013500
TATASTEEL15001700
FEDERALBNK70008500
RAMCOCEM800850
TVSMOTOR13501400
UJJIVAN17002200
UPL9001300
VEDL35006200
IDEA98000140000
ZEEL17003000

Source: NSE Circular dated March 31, 2020 on Revision in Market Lot of Derivative Contracts on Individual Stocks (zip)

## Implications of Increased Lot Size:

1. The trading activity on these scrips might take a little hit as the cost of Trading will increase
2. The Pricing of these contracts will be fair as the Market manipulation will reduce
3. The Value of Premiums on Options will also reduce to compensate for increased Lot Size

What do you think about this update in the lot size of Bank Nifty and Other Scrips After July 30, 2020 Expiry?  Share your views in the comment section below.