According to the data "top 100 richest bitcoin addresses", there are 106 addresses that have 10,000-10,0000 bitcoin, it should be more than enough to control the market although it less than 0.1%.
Most of those 100 richest addresses belong to major exchanges like binance cold-wallet, huobi cold-wallet and bittrex cold-wallet and others probably belong to miners addresses.
The fact is even BTC163,664 binance cold-wallet only 0.9% of total coins, with only 0.9% the price in the exchange market (binance) can drop in a significant number, let aside 10,000 bitcoin, if it can be dumped to various major exchanges, the global price will be crash for sure.
Exactly!! In my opinion it doesn't depend on what percentage of people hold the most Bitcoin, but we can judge it from how much Bitcoin is held by 1 person.
If one person holds Bitcoin thousands of times compared to other holders, it is clear he can freely manipulate the market with the amount of funds he has.