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

Stock Option Activity Summary

The Company’s stock option activity for the three months ended September 30, 2017, is as follows:



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

The aggregate intrinsic value of options exercisable at September 30, 2017, was $0.2 million 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 $0.5 million related to stock options will be recognized over a weighted-average period of 2.48 years.

The table below details the Company’s stock options outstanding as of September 30, 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	3.11	$	3.11	77,550	$	3.11
$5.03 – 8.35	270,702	8.43	6.29		86,000	6.59
$16.00 – 16.00	17,000	7.52	16.00		12,267	16.00
$1.60 – 16.00	365,252	7.26	$	6.07	175,817	$	5.56

Compensation costs recognized related to stock option awards were $67 thousand and $19 thousand for the three months ended September 30, 2017, and 2016, respectively.

Restricted Stock

The Company’s restricted stock activity for the three months ended September 30, 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	2	8.35
Outstanding at September 30, 2017	48	$	10.12

Stock compensation expenses related to restricted stock were $55 thousand and $843 thousand for the three months ended September 30, 2017, and 2016, respectively. The remaining share-based compensation expense of $193 thousand related to restricted stock awards granted will be recognized over a weighted-average period of 1.27 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 three months ended September 30, 2017, no shares were repurchased as part of the share repurchase program. As of September 30, 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.