Regularly traded
(b) Regularly traded(1) General rule. For purposes of paragraph (a)(1) of this section, a class of stock that is traded on one or more qualified exchanges or other markets, as defined in paragraph (c) of this section, is regularly traded on such exchanges or markets for any calendar year during which such class of stock is traded, other than in de minimis quantities, on at least 15 days during each calendar quarter. (2) Special rule for year of initial public offering. For the calendar year in which a corporation initiates a public offering of a class of stock for trading on one or more qualified exchanges or other markets, as defined in paragraph (c) of this section, such class of stock meets the requirements of paragraph (b)(1) of this section for such year if the stock is regularly traded on such exchanges or markets, other than in de minimis quantities, on 1/6 of the days remaining in the quarter in which the offering occurs, and on at least 15 days during each remaining quarter of the taxpayer's calendar year. In cases where a corporation initiates a public offering of a class of stock in the fourth quarter of the calendar year, such class of stock meets the requirements of paragraph (b)(1) of this section in the calendar year of the offering if the stock is regularly traded on such exchanges or markets, other than in de minimis quantities, on the greater of 1/6 of the days remaining in the quarter in which the offering occurs, or 5 days. (3) Anti-abuse rule. Trades that have as one of their principal purposes the meeting of the trading requirements of paragraph (b)(1) or (2) of this section shall be disregarded. Further, a class of stock shall not be treated as meeting the trading requirement of paragraph (b)(1) or (2) of this section if there is a pattern of trades conducted to meet the requirement of paragraph (b)(1) or (2) of this section. Similarly, paragraph (b)(2) of this section shall not apply to a public offering of stock that has as one of its principal purposes to avail itself of the reduced trading requirements under the special rule for the calendar year of an initial public offering. For purposes of applying the immediately preceding sentence, consideration will be given to whether the trading requirements of paragraph (b)(1) of this section are satisfied in the subsequent calendar year.