What I find more interesting/suspicious: why have there been no 13G-filings in the years before, as Swartz had much more than 10% of PTSC?

To facilitate the conversion of the debentures, agreements between the Company and Lincoln and Swartz which prohibit each of Lincoln and Swartz from owning more than 4.99% of the Company's Common Stock will be amended to allow them to own up to 9.99% of the Common Stock. With their holdings exceeding 5% they will need to make appropriate SEC filings upon future dispositions of the Company's stock.

Prior to February 10, 2006, there was no need for them to file as they were below the 5% reporting threshold.

Be well