Cerahelix Inc. of Orono has raised $575,000 of a $1 million equity and Series A preferred stock offering, according to a U.S. Securities and Exchange Commission filing.
The biotechnology company designs commercial-scale ceramic water filters.
The current funding went on sale Feb. 12 and requires a $10,000 minimum investment from any outside investor.
The company was the only one in Maine to raise venture financing in the second quarter of 2015, bringing in $200,000. That money came from the Maine Venture Fund and Portland and Bangor angel investors.
At the time, Cerahelix CEO and Founder Susan MacKay characterized the venture money as bridge funding toward a later $5 million Series A fund raise.
The company has said it is making a nano-ceramic, fast filtration system to clean water for commercial users, and is initially targeting production in the oil and gas industries.
MacKay graduated in the Maine Center for Entrepreneurial Development’s 2012 Top Gun class, saying at the time it helped her gain experience to launch her company.
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