Tuesday day 1 of OPEX week

Trading notes for 2026-02-17

TL;DR

First day back from holiday during option expiration week with severely negative gamma exposure across all SPX strikes created whipsaw conditions that tested my thesis. Despite initial success shorting the ES at 6850 during the morning dump, I held too long expecting acceleration to 6720 and got caught in aggressive reversal back to session highs, resulting in a stopped out trade that highlighted the importance of taking profits in high gamma environments.

Market Context

Today marked the return from holiday into a critical option expiration week with multiple events lined up: monthly volatility products Wednesday, monthly AM index options Thursday, and equity index/cash-settled currency options Friday. Major indexes opened significantly lower, taking out the previous week's low across ES, Nasdaq, Gold, and Bitcoin.

The most striking feature was the gamma exposure profile - extremely negative throughout all strikes with not a single positive gamma level on SPX. This setup typically creates conditions for explosive price moves in both directions as dealers are forced to chase price rather than provide dampening.

Market structure showed we were trading outside last week's value range, suggesting we'd likely establish new value area highs and lows for the week. The broader sector rotation was evident with the Magnificent 7 taking a beating alongside software stocks, indicating potential rotation out of AI and tech themes.

Thesis & Plan

My thesis centered on the negative gamma environment creating downside acceleration once we broke key levels. I was targeting shorts below 6800 on the ES, expecting the negative gamma to amplify selling pressure toward the swing low at 6720.

The setup looked compelling: we were maintaining below weekly VWAP, rejected volume at 6850, and remained outside last week's value area. VIX elevated to 22 confirmed the heightened volatility environment, with all risk assets (Bitcoin, Nasdaq, ES) selling off substantially.

Entries & Exits

• 9:47 AM: Entered short position after market pushed up, rejected daily and weekly open, then began retracing • 9:50 AM: Added to position during aggressive dump • ~1:30 PM: Stopped out as market reversed aggressively higher

The trade initially worked perfectly - we got the aggressive dump at 9:50, breaking down through key levels. However, the 10 o'clock reversal brought us substantially back into the daily range, testing and rejecting daily VWAP.

Risk Management

My risk management proved inadequate for the gamma environment. Instead of taking profits at the initial target low, I held expecting further acceleration to 6720. This decision cost me significantly as the negative gamma that initially helped my position began working against me on the reversal.

The position went from profitable to negative quickly, demonstrating how negative gamma creates two-way risk. What appeared to be just a liquidity sweep turned into a sustained reversal that ultimately stopped me out.

What Worked / What Didn't

What Worked:

• Initial read of gamma environment and setup was accurate
• Entry timing caught the morning dump effectively
• Correctly identified the broader sector rotation and risk-off environment

What Didn't Work:

• Failed to take profits when the trade was working
• Underestimated the two-way nature of negative gamma
• Got caught up in lower timeframe noise rather than focusing on higher timeframe structure

The move up showed one-sided price action with large consecutive up-close candles, suggesting institutional involvement rather than just retail positioning.

Lessons Learned

The most valuable insight came from observing timeframe dynamics. At 11:45 AM, I noted how lower timeframe moves appeared dramatic and excessive, painting a story that wasn't accurate on higher timeframes. When I zoomed out to the hourly chart, the picture became clearer - despite the aggressive intraday moves, we weren't actually breaking major structural levels.

Key takeaways for future negative gamma environments:

1. Take profits early - When gamma is severely negative, initial moves often reverse just as aggressively
2. Stops at obvious levels get run - Negative gamma means dealers chase price, creating liquidity sweeps at obvious highs/lows
3. Focus on higher timeframes - Lower timeframe action becomes misleading in high gamma environments
4. Question obvious setups - When a trade seems too obvious, it often is - the "composite man" concept of manipulation becomes relevant

The experience reinforced that in negative gamma environments, the key question isn't whether you'll be right about direction initially, but whether you can manage the inevitable whipsaws that follow. Taking partial profits and maintaining perspective on higher timeframe structure becomes critical for surviving option expiration week dynamics.