We are offering shares of our common stock pursuant to this prospectus supplement and the accompanying prospectus. Our shares of common stock are traded on the Nasdaq Capital Market under the symbol OPGN. On October 16, 2018, the last reported sale price of our common stock was $1.86 per share.
This offering is being made under a shelf registration statement declared effective by the Securities and Exchange Commission on September 9, 2016. Under the shelf registration statement, OpGen has the capacity to issue up to $50 million of its common stock. To date, OpGen has been offering, under the shelf registration statement, up to $11,500,000 of its common stock, from time to time, in an at-the-market, or ATM, offering with Cowen and Company LLC as its agent. To date, OpGen has raised $9,424,682 under the ATM offering. On October 16, 2018, OpGen terminated the ATM offering, leaving $2,075,318 unsold under such terminated ATM offering.
As a smaller reporting company with an aggregate market value of our outstanding common stock held by non-affiliates, or public float, below $75,000,000, pursuant to General Instruction I.B.6 of Form S-3, OpGen is limited in the amount we can offer for sale and raise under the offering contemplated in this prospectus supplement to one-third of our public float, after subtracting any sales made under our shelf registration statement in the twelve months immediately preceding the date of this prospectus supplement. OpGen has a public float of $14,218,364 as of September 24, 2018, and has raised $1,040,863 under the ATM offering in the twelve months immediately preceding the date of this prospectus supplement. OpGen calculated its public float as of September 24, 2018, based on the average of the bid and asked prices of our common stock as of such date of $2.445 per share. Based on General Instruction I.B.6 of Form S-3, in no event will we sell securities registered on the registration statement of which this prospectus supplement is a part in excess of $3,698,592.
