“Comprising close to 90% of all trading volume, speculators as forex market players come in all shapes and sizes.”
I thought the big banks and institutions… are responsible for the most liquidity in the market?
hi - and welcome to the forum! 
yes indeed - they are
those are exactly the speculators referred to in the sentence you quoted 
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It is right. Banks and other financial institutions play a significant role in providing liquidity to the forex market.
Right. Big banks and financial institutions play a crucial role in providing liquidity in the forex market.