I am not sure how to find out but i am sure they are still holding, institutional / large shareholders usually don't sell their investment in short run, they know going into it that there is a risk that in the near term the price might drop, thats why they always (Usually) are longer term investors who stay with the company until they get adequate return for their investment however long it takes unless something is terriblly wrong with the company fundamentals (risk of bankruptcy) which i don't think is the case here. so i am sure there is nothing to worry about, give it time