Earnings per Common Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per Common Share

Note 4: Earnings per Common Share

Basic earnings per share is calculated by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. Net income available to common stockholders is net income to FSB Bancorp, Inc. Diluted earnings per share is calculated in a manner similar to that of basic earnings per share except that the weighted average number of common shares outstanding is increased to include the number of incremental common shares that would have been outstanding under the treasury stock method if all potentially dilutive common shares (such as stock options) issued became vested during the period. There is no impact on earnings per share because no stock options have vested as of March 31, 2018. On September 27, 2017, the Board of Directors of the Company approved restricted stock and stock option grants to senior management and the directors of the Company, pursuant to the terms of the 2017 Equity Incentive Plan (the “Plan”). The Plan was approved previously by the Company’s stockholders on August 29, 2017. An aggregate of 15,000 stock options and 6,400 shares of restricted stock were granted to senior management during the period ended March 31, 2018. The grants to senior management vest over a five year period in equal annual installments, with the first installment vesting on the first anniversary date of the grant and succeeding installments on each anniversary thereafter, through 2023. The Company did not grant any restricted stock awards or stock options for the period ended March 31, 2017. Unallocated common shares held by the ESOP are not included in the weighted average number of common shares outstanding for purposes of calculating earnings per common share until they are committed to be released.

The following tables set forth the calculation of basic and diluted earnings per share.

	Three months ended
	March 31,
(In thousands, except per share data)	2018		2017
Basic and Diluted Earnings Per Common Share
Net income (loss) available to common stockholders	$	74	$	(5	)
Weighted average common shares outstanding		1,907		1,905
Earnings per common share – basic and diluted	$	0.04	$	0.00