Health-care RFID tech company Wavemark Inc. has taken in $2.8 million of a planned $3 million debt financing round, according to federal documents.

The documents Littleton-based Wavemark filed with the U.S. Securities and Exchange Commission show that there were 17 participants in the debt round, but did not identify them by name. In previous interviews, Wavemark officials have only characterized backers as friends and family, and professional private investors. This latest funding brings the backing in Wavemark through equity and debt to approximately $21 million, according to the SEC.

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