Helius Medical Technologies, Inc. HSDT rallied in Monday's after-hours trading after announcing a Solana SOL/USD purchase worth $175 million.Helius Medical Kickstarts SOL Treasury PlayThe stock popped over 8% in after-hours, reversing its losses during the regular trading session. Helius Medical set its digital asset treasury strategy into motion, purchasing 760,000 SOL at an average price of $231, totaling $175.60 million.The neurotech company said it holds in excess of $335 million of cash, which it plans ...