So the key part for the Baker Bros ( qualified institutional investors ) is the following
" thereafter within 10 calendar days of the end of any month in which the person's beneficial ownership increases or decreases more than 5% computed as of the end of the month. Rule 13d-1(b)(2) and 13d-2(c)"
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So by Jan 10th we will know if the Baker Bros have increased or decreased their position in AMRN by more than 5% during Dec 2019 ?