No, Oppenheimer did not release their 13F. I see that today they did file an AMENDED 13F for the prior quarter (12/31/2015). Is that what you are referring to? So once again a blatant misstatement of any sort of truth or fact is thrown around freely on here.
There is no 13F for 3/31/2016 filed, which isn't surprising since the due date is not until the middle of May. But again, they filed an amendment for 12/31/2015. And it seems that this has confused the Whale Wisdom site. Your link takes us to the 12/31/2015 holdings, and it is adding an additional 5.3m shares (basically double counting), because the amended filing has confused it. If you toggle at the top to 3/31/2016, you will see a negative change of 5.3m shares.
The number of AMRN shares in the original 13F is the same as this amended 13F.
Next time you want to throw out facts, pleas make sure they are actually facts. Link to Oppenheimer's SEC filings. The "A" next to the filing name means amended, and at the top of the amended 13F is shows the reporting period as 12/31/2015:
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