NOV Inc. — Director's Dealing 2011

May 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: NATIONAL OILWELL VARCO INC (NOV)
CIK: 0001021860
Period of Report: 2011-05-19

Reporting Person: ARMSTRONG GREG L (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-19	Common Stock	A	1215	—	Acquired	17460	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-19	Non-Qualified Stock Option (right to buy)	$67.93	A	3232	Acquired	2021-05-20	Common Stock (3232)	Direct

Footnotes

F1: Options vest in three (3) equal annual installments commencing on the date indicated.