Bitcoin holds near September highs as crypto stock proxies slide

Bitcoin spent September outperforming stocks and gold. Then October arrived, and the companies built to mirror it went sideways in the worst way.Five major Bitcoin proxy stocks all slid sharply as the new month opened: Strategy (MSTR), Coinbase (COIN), Marathon Digital (MARA), Riot Platforms (RIOT) and CleanSpark (CLSK). Bitcoin dipped too, but far less dramatically. The split matters because these stocks are supposed to move with the coin. Lately they have mostly moved with the bond market.The September numbers looked healthy. Bitcoin gained approximately 6-7% on the month and closed near $83,500-$84,000. At its intraday peak it touched roughly $87,350.That run beat both equities and gold over the same stretch. Corporate treasury buying did much of the lifting, with Strategy the most prominent buyer.Strategy now holds approximately 847,000-848,000 BTC, bought at an average price of around $75,400. Bitcoin still trades above that cost basis, so the company's stack remains in the green on paper.Spot Bitcoin ETFs added to the tailwind. September inflows into those funds totaled about $2.9 billion. Then the flows reversed into outflows, just as corporate treasury demand started to fade.On October 7, Bitcoin slipped below $83,000. Liquidations totaled around $500-$700 million as leveraged traders got forced out of positions.The pressure came from outside crypto. The 10-year US Treasury yield climbed to near 24-year highs, and oil prices pushed above $100.Bitcoin proxy stocks sit at the far end of that risk spectrum. Their price swings typically run at a beta of 1.5x to 3x or more relative to Bitcoin. Put simply, a 1% move in Bitcoin can show up as a 1.5% to 3% move in the stock, and sometimes more.Each company also carries its own baggage. Strategy's value is tied to a balance sheet built around Bitcoin. Coinbase earns more when trading volume and prices are high. Marathon, Riot and CleanSpark are miners whose economics depend on the gap between the Bitcoin price and their operating costs, including energy.According to apex.exchange, which flagged the breakdown across all five names, one of the stocks also faces a deadline within a week.The first thing to monitor is Bitcoin's support zone between $81,000 and $83,000. That band has been under short-term pressure as traders digest the yield spike and the liquidation wave.The second thing is the bond market. With 10-year yields near 24-year highs, the macro backdrop is doing more to set crypto equity prices than anything happening on-chain.The third is the flow picture. September's roughly $2.9 billion in ETF inflows and steady corporate buying gave Bitcoin a durable bid. The switch to outflows and softer treasury demand removes some of that cushion.Finally, the divergence itself is worth taking seriously. Investors who bought proxy stocks as a substitute for Bitcoin got a reminder that they own something different: a company, with debt, costs, deadlines and exposure to interest rates. Bitcoin's relative resilience points to real underlying demand. The proxies' slide points to how fragile leveraged exposure becomes when yields climb and liquidity thins.