The options exercised involved 62.5 million at 10c and 20M at 15c, with the stock trading at levels of about 14-17c over the past month.
In March the shares were at little more than 3c.
No identification of those exercising the options was provided.
Aston's focus is the Eleston gold prospect in Ontario where diamond drilling is underway.
More than C$10 million has historically been spent at the prospect prior to Aston's arrival last year.
Shares in Aston were down 3% to 16.5c in morning trade, capitalising the company at $144 million.
