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| Effective date | Margin stocks | Convertible bonds | Short sales, T only1 |
|---|---|---|---|
| 1934, Oct. 1 | 25-45 | … | … |
| 1936, Feb. 1 | 25-55 | … | … |
| 1936, Apr. 1 | 55 | … | … |
| 1937, Nov. 1 | 40 | … | 50 |
| 1945, Feb. 5 | 50 | … | 50 |
| 1945, July 5 | 75 | … | 75 |
| 1946, Jan. 21 | 100 | … | 100 |
| 1947, Feb. 1 | 75 | … | 75 |
| 1949, Mar. 3 | 50 | … | 50 |
| 1951, Jan. 17 | 75 | … | 75 |
| 1953, Feb. 20 | 50 | … | 50 |
| 1955, Jan. 4 | 60 | … | 60 |
| 1955, Apr. 23 | 70 | … | 70 |
| 1958, Jan. 16 | 50 | … | 50 |
| 1958, Aug. 5 | 70 | … | 70 |
| 1958, Oct. 16 | 90 | … | 90 |
| 1960, July 28 | 70 | … | 70 |
| 1962, July 10 | 50 | … | 50 |
| 1963, Nov. 6 | 70 | … | 70 |
| 1968, Mar. 11 | 70 | 50 | 70 |
| 1968, June 8 | 80 | 60 | 80 |
| 1970, May 6 | 65 | 50 | 65 |
| 1971, Dec. 6 | 55 | 50 | 55 |
| 1972, Nov. 24 | 65 | 50 | 65 |
| 1974, Jan. 3 | 50 | 50 | 50 |
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Note: These regulations, adopted by the Board of Governors pursuant to the Securities Exchange Act of 1934, limit the amount of credit that may be extended for the purpose of purchasing or carrying margin securities (as defined in the regulations) when the loan is collateralized by such securities. The margin requirement, expressed as a percentage, is the difference between the market value of the securities being purchased or carried (100 percent) and the maximum loan value of the collateral as prescribed by the Board. Regulation T was adopted effective October 1, 1934; Regulation U, effective May 1, 1936; and Regulation X, effective November 1, 1971. The former Regulation G, which was adopted effective March 11, 1968, was merged into Regulation U, effective April 1, 1998. 1. From October 1, 1934, to October 31, 1937, the requirement was the margin customarily required by the brokers and dealers. Return to table … Not applicable Return to table |