Cases from cite.case.law:

KERRIGAN, K. Jr. K. L. v. MERRILL LYNCH, PIERCE, FENNER SMITH, INCORPORATED, T. L. B., 450 F. Supp. 639 (S.D.N.Y. 1978)

. . . The repurchase option granted by article VI of the certificate was in accord with Rule 313.21 of the . . . that the original purpose of the option was to meet the provisions of New York Stock Exchange Rule 313.21 . . . Plaintiffs have overlooked the fact that Rule 313.21 continued to apply to Merrill Lynch until the corporation . . . Further, in order to meet the requirements of New York Stock Exchange Rule 313.21, Merrill Lynch was . . .

ST. LOUIS UNION TRUST COMPANY, a H. Jr. C. C. H. v. MERRILL LYNCH, PIERCE, FENNER SMITH INCORPORATED, a T. B. L., 562 F.2d 1040 (8th Cir. 1977)

. . . Rule 313.21 of the New York Stock Exchange, of which Merrill Lynch was a member, required the company . . . However, Rule 313.21 continued to apply to Merrill Lynch until the company had freely transferable stock . . .

ST. LOUIS UNION TRUST COMPANY, a v. MERRILL LYNCH, PIERCE, FENNER SMITH, INCORPORATED, a, 412 F. Supp. 45 (E.D. Mo. 1976)

. . . Pursuant to Rule 313.21 of the New York Stock Exchange, the certificate of incorporation of Merrill Lynch . . .