Anyone with a large enough holding can manipulate the market.
Market prices depend largely on exchanges which can be manipulated with mere hundreds of bitcoins.
The big players transact OTC in thousands or tens of thousands of coins.
They're more than happy to lose smaller amounts on exchanges in order to accumulate or liquidate much more OTC in order to realize great profits, usually Bitcoin profits.
Hmm, it means they will try to manipulate the market, but should we care as Who is John Galt? said we cannot do anything about it because buying and selling of BTC is open for everyone and the text i bolded took me some time to understand but what i understand for this is, if a person let's say Dictator69 wants to sell BTC on exchange and some company like BlackRock contacts the Dictator69 to make OTC deal, in this deal both parties will have huge profits.
But how can they contact me, like if a seller selling big amount of BTC then how a company like BlackRock come to get the contact details of that seller on that exchange. Because we just sign up on exchanges like we also do KYC but how could they get our details. I am still new to the field and i did not knew about this OTC deals.