I believe the discrepancy has to do with the different forms and what they report. JRoon knows about this a lot more than me but Fintel has this disclaimer:
"We present 13D/G filings separately from the 13F filings because of the different treatement by the SEC. 13D/G filings can be filed by groups of investors (with one leading), whereas 13F filings cannot. This results in situations where an investor may file a 13D/G reporting one value for the total shares (representing all the shares owned by the investor group), but then file a 13F reporting a different value for the total shares (representing strictly their own ownership). This means that share ownership of 13D/G filings and 13F filings are oftentimes not directly comparable, so we present them separately."</p>
I wouldn't think Sarissa would take the chance to report incorrect information to their clients.
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