Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans

Stock Option Activity Summary

The Company’s stock option activity for the six months ended December 31, 2017, is as follows:



	Shares (in thousands)	Weighted Average Exercise Price
Outstanding at June 30, 2017	365	$	6.07
Granted	—	—
Exercised	—	—
Canceled or expired	2	5.30
Outstanding at December 31, 2017	363	$	6.07

The aggregate intrinsic value of options exercisable at December 31, 2017, was $30 thousand as the fair value of the Company’s common stock is more than the exercise prices of these options. The remaining share-based compensation expense of $483 thousand related to stock options will be recognized over a weighted-average period of 2.28 years.

The table below details the Company’s stock options outstanding as of December 31, 2017:



Range of exercise prices	Number Outstanding	Options Outstanding Weighted- Average Remaining Contractual Life (years)	Weighted- Average Exercise Price		Number Exercisable	Options Exercisable Weighted- Average Exercise Price
$1.60 – 3.55	77,550	2.86	$	3.11	77,550	$	3.11
$5.30 – 8.35	268,507	8.17	6.30		86,000	6.59
$16.00 – 16.00	17,000	7.27	16.00		12,264	16.00
$1.60 – 16.00	363,057	6.99	$	6.07	175,814	$	5.57

Compensation costs recognized related to stock option awards were $67 thousand and $18 thousand for the three months ended December 31, 2017, and 2016, respectively and $134 thousand and $37 thousand for the six months ended December 31, 2017 and 2016, respectively.

Restricted Stock

The Company’s restricted stock activity for the six months ended December 31, 2017, is as follows:



	Shares (in thousands)	Weighted Average Grant-Date Fair Value
Outstanding at June 30, 2017	56	$	9.95
Granted	—	—
Vested	6	9.22
Canceled or expired	3	8.35
Outstanding at December 31, 2017	47	$	10.16

Stock compensation expenses related to restricted stock were $54 thousand and $74 thousand for the three months ended December 31, 2017, and 2016, respectively and $108 thousand and $917 thousand for the six months ended December 31, 2017 and 2016, respectively. The remaining share-based compensation expense of $139 thousand related to restricted stock awards granted will be recognized over a weighted-average period of 1.16 years.

Securities Repurchase Program

On December 13, 2014, the Board of Directors amended the share repurchase program to allow for the repurchase of up to $5 million in Astrotech Corporation stock until December 31, 2015. On December 3, 2015, the Board of Directors authorized the extension of the share repurchase program through December 31, 2016. The share repurchase program ended as of December 31, 2016; as such, during the six months ended December 31, 2017, no shares were repurchased as part of the share repurchase program. As of December 31, 2017, the Company had repurchased 37,727 shares of common stock at a cost of $492 thousand, which represents an average cost of $13.05 per share.

Shares Repurchased from Related Parties

In August 2016, the Company repurchased 38,400 shares issued to the Chief Financial Officer and Chief Operating Officer related to their tax withholding obligations at a cost of $308 thousand, which represents an average cost of $8.00 per share. In December 2016, the Company repurchased 120,370 shares from the Chief Executive Officer at a cost of $975 thousand, which represents an average cost of $8.10 per share.