For purposes of subparagraph (B), the aggregation rule of section 133(b)(6)(D) shall apply. (2) Stock disposed of before allocation Any disposition of section 133 securities to which paragraph (1) does not apply if— (A) such disposition occurs before such securities are allocated to accounts of participants or their beneficiaries, and (B) the proceeds from such disposition are not so allocated. (d) Section not To apply to certain dispositions (1) In general This section shall not apply to any disposition described in paragraph (1), (3), or (4) of section 4978(d). (2) Certain reorganizations For purposes of this section, any exchange of section 133 securities for employer securities of another corporation in any reorganization described in section 368(a)(1) shall not be treated as a disposition, but the employer securities received shall be treated as section 133 securities and as having been held by the plan during the period the securities which were exchanged were held. (3) Forced disposition occurring by operation of state law Any forced disposition of section 133 securities by an employee stock ownership plan occurring by operation of a State law shall not be treated as a disposition. This paragraph shall only apply to securities which, at the time the securities were acquired by the plan, were regularly traded on an established securities market. (4) Coordination with other taxes This section shall not apply to any disposition which is subject to tax under section 4978 or section 4978A (as in effect on the day before its repeal). (e) Definitions and special rules For purposes of this section— (1) Liability for payment of taxes The tax imposed by this section shall be paid by the employer. (2) Section 133 securities The term section 133 securities means employer securities acquired by an employee stock ownership plan in a transaction to which section 133 applied. (3) Disposition The term disposition includes any distribution. (4) Ordering rules For ordering rules for dispositions of employer securities, see