Established securities market
(iv) Established securities market. For purposes of this paragraph, the term established securities market includes (A) a national securities exchange which is registered under section 6 of the Securities Exchange Act of 1934 (15 U.S.C. 78f), (B) an exchange which is exempted from registration under section 5 of the Securities Exchange Act of 1934 (15 U.S.C. 78e) because of the limited volume of transactions, and (c) any over-the-counter market. For purposes of this (iv), an over-the-counter market is reflected by the existence of an interdealer quotation system. An interdealer quotation system is any system of general circulation to brokers and dealers which regularly disseminates quotations of obligations by identified brokers or dealers, other than a quotation sheet prepared and distributed by a broker or dealer in the regular course of business and containing only quotations of such broker or dealer. (v) Examples. The rules stated in this paragraph may be illustrated by the following examples: (5) Special rule for convertible securities(i) General rule. If an obligation contains a right whereby the holder of such obligation may convert it directly or indirectly into another obligation which would be treated as a payment under paragraph (e)(1) of this section or may convert it directly or indirectly into stock which would be treated as readily tradable or designed to be readily tradable in an established securities market under paragraph (e)(4) of this section, the convertible obligation shall be considered to be in a form designed to render such obligation readily tradable in an established securities market unless such obligation is convertible only at a substantial discount. In determining whether the stock or obligation into which an obligation is convertible is readily tradable or designed to be readily tradable in an established securities market, the rules stated in paragraph (e)(4) of this section shall apply, and for purposes of such paragraph (e)(4) if such obligation is convertible into stock then the term stock shall be substituted for the term obligation wherever it appears in such paragraph (e)(4). (ii) Substantial discount rule. Whether an obligation is convertible at a substantial discount depends upon the particular facts and circumstances. A substantial discount shall be considered to exist if at the time the convertible obligation is issued, the fair market value of the stock or obligation into which the obligation is convertible is less than 80 percent of the fair market value of the obligation (determined by taking into account all relevant factors, including proper discount to reflect the fact that the convertible obligation is not readily tradable in an established securities market and any additional consideration required to be paid by the taxpayer). Also, if a privilege to convert an obligation into stock or an obligation which is readily tradable in an established securities market may not be exercised within a period of one year from the date the obligation is issued, a substantial discount shall be considered to exist. (6) Effective date. The provisions of this paragraph (e) shall apply to sales or other dispositions occurring after May 27, 1969, which are not made pursuant to a binding written contract entered into on or before such date. No inference shall be drawn from this section as to any questions of law concerning the application of section 453 to sales or other dispositions occurring on or before May 27, 1969.