In March 2018, the holder of 600,000 shares of AbTech preferred stock converted such shares into 15,972 shares of ABHD common stock in accordance with the terms of the reverse acquisition transaction that occurred between AbTech and ABHD in 2011. This conversion reduced the number of AbTech preferred shares outstanding to 612,947 and reduced the minority interest of preferred shareholders in AbTech from approximately 15.3% to 8.5%. Accordingly, the carrying amount of the non-controlling interest was reduced by $2,141,701, which amount was applied to reduce additional paid-in capital by the same amount, in the first quarter of 2018.

For the nine months ended September 30, 2018, additional paid-in capital was increased by $4,500 for stock-based compensation resulting from stock options vesting during the first quarter of 2018.

There were no stock options or warrants granted during the nine months ended September 30, 2018. As of September 30, 2018, all outstanding stock options granted by the Company were fully vested.