Beginning January 13, 2021, the strike price interval of options strike price of 15,000 points or higher will be determined by the following method: 100 point interval for the near-month contracts, 200 point interval for the quarter-month contracts. Weekly contracts are the same as the near-month contracts, and in the range of 3 percent above and below the base index, add contracts with strike prices at half the strike price intervals of the near-month contracts.