A 10-C is an SEC filing produced and submitted by a company whenever there is a change in the ownership of 5% or more of it's shares. This could be due to a takeover, acquisition, large equity investment, or even in the name of a majority shareholder.

10-C's are only required of companies that are traded electronically on the NASDAQ exchange and are usually filed at the same time as a 13-D. The filing must be made within 10 days of the change in ownership occurring.

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