Interesting. 2982 BTC is not a huge amount to influence the price of Bitcoin. But these are only what you have identified. More may have taken action.
I wonder that what is their purpose?
Even if the purpose was to sell those coins in the market what is stopping them as they own the coin and 2982 BTC might not be a huge amount of coins to influence in the market what if these coins are shifted to future exchanges like bitmex, you could manipulate the market with the amount. I wonder that what is their purpose?
One of the things I don't know is margin trading. But first we need to look at the daily margin trading volume to talk about it. I think this figure is too low even for margin trading.
Anyone who hodls may one day findd out that he needs some money. So, don't see anything suspicious.
What a huge needs then
They can buy a small football club with that amount of BTC