Look no further... Half of Datametrex's loss in value is caused by Graph Blockchain.
Graphblockchain's market cap has fallen from 83M to 8M between February and today: Loss of 75M
Datametrex owns 25% of Graph, which is about 19M.
Datametrex's market cap fell from 95M to 58M between February and today: Loss of 37M.
19M/37M=51%