Positron Corporation (POSC)

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The SEC requires a form D to be submitted within 15 days of a new offering. It's unlikely that Positron just now discovered that they hadn't submitted in 2009/2010. More likely, the SEC discovered this for them.
http://www.sec.gov/about/forms/formd.pdf
When to file:
An issuer must file a new notice with the SECfor each new offering of securities no later than15 calendar days after the "date of first sale" ofsecurities in the offering as explained in theInstruction to Item 7. For this purpose, the dateof first sale is the date on which the first investoris irrevocably contractually committed to invest,which, depending on the terms and conditionsof the contract, could be the date on which theissuer receives the investor's subscriptionagreement or check. An issuer may file thenotice at any time before that if it hasdetermined to make the offering. An issuer mustfile a new notice with each state that requires itat the time set by the state. For state filinginformation, go to www.NASAA.org. Amandatory capital commitment call does notconstitute a new offering, but is made under theoriginal offering, so no new Form D filing is required