As per the etherscan data here

https://etherscan.io/token/0x056dd20b01799e9c1952c7c9a5ff4409a6110085#balances

There are total of 7,092 holders of the WPP token under the contract address 0x056dd20b01799e9c1952c7c9a5ff4409a6110085, which probably means 50% of the tokens are already distributed among 7000 approx number of investors until and the address 0x0603444a9698facd901ab985a23ac24de296b986 holds the 50% of the remaining supply which should be reserved for other expenses of the project like promotion, team reserves etc.

I also found that there bounty tokens are not distributed yet, so that tokens too are included in the 50% hold in the address here

We could get to a conclusion that the address which hold most number of tokens leaving the projects personal address, should be some whales who already bought 1+% of total tokens at the time of token sale.

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If you are pointing to the address 0x0603444a9698facd901ab985a23ac24de296b986 which holds 50% supply specifically, it is rather the address of the token owners hence holding 50% reserved supply.