RBN Robbins & Myers, Inc.

1994 Long-Term Incentive Stock Plan

1995 Stock Option Plan for Non-Employee Directors

1999 Long-Term Incentive Stock Plan

2004 Stock Incentive Stock Plan as Amended

(Full title of the plans)

Linn S. Harson, Esq.

Thompson Hine LLP

10050 Innovation Drive

Suite 400

Dayton, Ohio 45342-4934

(937) 443-6842

(Name, address, including zip code, and telephone number,

including area code, of agent for service)

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

DE-REGISTRATION OF SECURITIES

This Post-Effective Amendment (the “Amendment”) is being filed to de-register all Common Shares, without par value (the “Common Shares”), of Robbins & Myers, Inc. (the “Company”) registered on the Registration Statements on Form S-8 (collectively, the “Registration Statements”) listed below which were previously registered (note that the share numbers listed below do not take into account corporate actions, such as stock splits, taken in the interim) and have not been sold or otherwise issued as of the date of filing this Amendment:

On February 20, 2013, pursuant to an Agreement and Plan of Merger, dated as of August 8, 2012, by and among National Oilwell Varco, Inc. (“NOV”), Raven Process Corp., a wholly-owned subsidiary of NOV (“Merger Sub”), and the Company, Merger Sub merged with and into the Company, with the Company surviving the merger as a wholly-owned subsidiary of NOV (the “Merger”). In the Merger, each outstanding Common Share of the Company (other than shares owned by NOV, Merger Sub, the Company, or any of their respective subsidiaries) was cancelled and converted into the right to receive $60.00 per share in cash without interest.

As a result of the Merger, the Company has terminated any offering of the Company’s securities pursuant to its existing registration statements, including the Registration Statements. In accordance with an undertaking made by the Company in each of the Registration Statements to remove from registration, by means of a post-effective amendment, any of the securities that had been registered for issuance that remain unsold at the termination of the offering, the Company hereby removes from registration all of such securities of the Company registered but unsold under the Registration Statements.