Nvidia and Tesla show limits of GEX models

Nvidia’s stock has been especially erratic. It slid to $170.07 on Sept. 17, then rebounded to $223.96 on Aug. 7 before easing to $214.72 on Aug. 21, with volume still running near 99 million shares on the latest session. The 50-day moving average sits at $207.58, while the RSI has fallen from overbought territory to 59.5, showing how quickly momentum can reset even after a sharp run.

Tesla is showing the same problem from a much higher volatility base. The stock jumped to $489.88 in December, then sank to $345.13 on Aug. 20 before rebounding to $362.86 on Aug. 21, with nearly 59.0 million shares changing hands. Its RSI remains elevated at 72.7 even after the pullback, a sign that options-driven positioning is still distorting the tape.

The stakes are biggest for market makers and the traders who use dealer positioning to forecast “pinning” or trend breaks. In names like Nvidia and Tesla, large open interest, weekly expiries and repeated re-hedging can create feedback loops that overpower index-level relationships, making stock-specific price action less predictable than SPY or other broad benchmarks.

That divergence is showing up in sentiment gauges too. Adalytica’s Tesla earnings sentiment reads 93, or “Extreme Greed,” while Nvidia’s sits at 64, a “Neutral” reading, underscoring how quickly trader positioning can become crowded in individual names even as the S&P 500 remains more balanced.

For investors, the message is not to abandon options models, but to treat them as less reliable in the most heavily traded single stocks, where gamma can change fast and volatility can expand without warning. The next catalyst is the flow around upcoming expiries and any fresh earnings or AI-related headlines that can force another dealer hedge reset.