(5)

Earnings Per Share

Earnings per common share attributable to Landstar System, Inc. and subsidiary are based on the weighted average number of shares outstanding, including outstanding non-vested restricted stock and outstanding Deferred Stock Units. Diluted earnings per share attributable to Landstar System, Inc. and subsidiary are based on the weighted average number of common shares and Deferred Stock Units outstanding plus the incremental shares that would have been outstanding upon the assumed exercise of all dilutive stock options.

The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per common share attributable to Landstar System, Inc. and subsidiary to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share attributable to Landstar System, Inc. and subsidiary (in thousands):


	Thirty Nine Weeks Ended				Thirteen Weeks Ended
	September 29, 2018		September 30, 2017		September 29, 2018		September 30, 2017
Average number of common shares outstanding		41,530		41,924		41,101		41,957
Incremental shares from assumed exercises of stock options		46		89		36		71

Average number of common shares and common share equivalents outstanding		41,576		42,013		41,137		42,028

For both of the thirty-nine-week periods ended September 29, 2018 and September 30, 2017, no options outstanding to purchase shares of common stock were antidilutive. Outstanding RSUs were excluded from the calculation of diluted earnings per share attributable to Landstar System, Inc. and subsidiary for all periods because the performance metric requirements or market condition for vesting had not been satisfied.