October 16 Recap: SPX GEX Deepens to −$143.34B as Premium Falls 31%
$18.8B in single-name premium, 25% bullish versus 28% bearish. MU led at $1.8B Bearish; SPX GEX was −$143.34B.
SPX net GEX went from −13.69B on October 15 to −143.34B on October 16, the most negative SPX reading in any Digest edition so far. Single-name premium fell from $27.1B to $18.8B (−31%), and the tape turned from leaned bullish to leaned bearish.
$18.8B, 57% calls, 25% bullish versus 28% bearish. MU led at $1.8B Bearish; every index GEX row except DIA was Negative.
Open Daily Market Recap or the October 16 session. Sign-in and a paid entitlement may be required.
What the recap printed
Test app, session 2026-10-16, KPI. Captured October 21, 2026 (Pacific time).
| Reading | Recap value |
|---|---|
| Single-name premium | $18.8B |
| Call / Put | 57% / 43% |
| Bullish / Bearish | 25% / 28% |
| Overall tone | leaned bearish |
| First 30-minute window | 09:30 · $2.2B |
Sentiment bars: Neutral $8.9B, Bearish $5.2B, Bullish $4.7B.
Test app, session 2026-10-16, Step 1. Captured October 21, 2026 (Pacific time).
What changed since October 15
| Reading | Oct 15 | Oct 16 |
|---|---|---|
| Single-name premium | $27.1B | $18.8B |
| Call / Put | 47% / 53% | 57% / 43% |
| Bullish / Bearish | 27% / 24% | 25% / 28% |
| Tone | leaned bullish | leaned bearish |
| Leader | MU $2.8B Bullish | MU $1.8B Bearish |
| SPX net GEX ($B) | −13.69 Negative | −143.34 Negative |
| SPY net GEX ($B) | +4.06 Positive | −15.46 Negative |
| Largest MU ticket | 1,070 PUT 2026-10-16 $42M | 980 PUT 2027-09-17 $8M |
The call share rose ten points while the sentiment split moved from three points bullish to three points bearish. SPY joined SPX, NDX, QQQ, and IWM on the Negative side; DIA stayed Positive (+0.21 to +0.44).
Leaders: where premium concentrated
Test app, session 2026-10-16, Step 2. Captured October 21, 2026 (Pacific time).
| Symbol | Premium | Call | Put | Net bias |
|---|---|---|---|---|
| MU | $1.8B | $929M | $842M | Bearish |
| TSLA | $1.3B | $750M | $529M | Bearish |
| META | $968M | $667M | $301M | Bearish |
| NVDA | $953M | $554M | $399M | Bearish |
| AMD | $826M | $474M | $352M | Bearish |
| SNDK | $783M | $323M | $460M | Bearish |
All six of the largest names carried Bearish tags; AAPL ($582M) was the first Mixed name. Five of the six showed more call than put premium, SNDK the exception. On October 15, MU, NVDA, SNDK, and AMD had all been tagged Bullish.
The bottom line and glance print MU at $1.7B; the leaders table and headline cards print $1.8B.
Test app, session 2026-10-16, Bottom line / glance. Captured October 21, 2026 (Pacific time).
Exposure and volatility context
The glance lists NFLX +0M shares-equiv. as largest Net DEX and TSLA 297% as largest Net DEI magnitude. Step 4 pairs TSLA's 297% with a Negative Net DEX sign; on October 15 the leader there was MU at 133%.
Step 5's highest IV rank among active names is LLY 69 / 100, with 42.7% 30-day implied volatility, down from RKLB's 100 / 100 on October 15.
Index GEX: SPX −143.34B
Test app, session 2026-10-16, Step 6 · T+1. Captured October 21, 2026 (Pacific time).
| Index | Net GEX ($B) | Regime |
|---|---|---|
| SPX | −143.34 | Negative |
| SPY | −15.46 | Negative |
| QQQ | −8.39 | Negative |
| IWM | −5.67 | Negative |
| NDX | −3.49 | Negative |
| DIA | +0.44 | Positive |
SPX's −143.34 is beyond the −105.30 printed for October 14. Against October 15, QQQ roughly tripled (−2.85 to −8.39) and IWM roughly doubled (−2.66 to −5.67), while NDX moved slightly the other way (−3.89 to −3.49).
Headline name: MU at $879
Test app, session 2026-10-16, Step 8. Captured October 21, 2026 (Pacific time).
Cards: last $879, premium $1.8B, 52% calls, 27% bullish, 73% average IV on traded contracts. On October 15 the cards read $931, $2.8B, 48% calls, 29% bullish, and 75%.
| Time | Type | Strike | Expiry | Premium | Sentiment |
|---|---|---|---|---|---|
| 10:38 | PUT | 980 | 2027-09-17 | $8M | BEARISH |
| 11:54 | CALL | 940 | 2027-01-15 | $7M | NEUTRAL |
| 10:38 | PUT | 800 | 2028-01-21 | $5M | BEARISH |
| 15:04 | PUT | 800 | 2027-01-15 | $5M | BULLISH |
| 10:38 | PUT | 990 | 2027-09-17 | $4M | BULLISH |
| 10:38 | PUT | 970 | 2027-09-17 | $4M | BULLISH |
Test app, session 2026-10-16, Step 8 · prints. Captured October 21, 2026 (Pacific time).
On October 15 the six largest MU tickets were $28M–$42M puts expiring the next day, 2026-10-16. On October 16 the largest was $8M, and all six expired between January 2027 and January 2028. Four 10:38 puts split their tags: Bearish at the 980 and 800 strikes, Bullish at 990 and 970.
Movers: CRGY +8.6%
Test app, session 2026-10-16, Step 7. Captured October 21, 2026 (Pacific time).
Bottom line: CRGY +8.6%. Step 7 in both runs: CRGY 8.7%, Up. October 15's largest gain was CYPH +23.8%.
What this session is evidence of
| Question | Oct 16 | Oct 15 | Clock |
|---|---|---|---|
| Size / tone | $18.8B · 25% / 28% · leaned bearish | $27.1B · 27% / 24% · leaned bullish | Session tape |
| Concentration | MU $1.8B Bearish | MU $2.8B Bullish | Session leaders |
| Relative exposure | TSLA DEI 297% · DEX Negative | MU DEI 133% · DEX Positive | Session exposure |
| Volatility | LLY IV rank 69 · IV 42.7% | RKLB IV rank 100 · IV 130.5% | T+1 |
| Index structure | SPX −143.34B Negative | SPX −13.69B Negative | T+1 |
| Largest MU print | 980 PUT 2027-09-17 $8M BEARISH | 1,070 PUT 2026-10-16 $42M BULLISH | Session ticket |
How to read these numbers
This edition reads TradingFlow's Daily Market Recap for October 16, 2026, captured on October 21 (Pacific time); two runs printed the same figures. It is a completed-session report, not a trade recommendation.
Two clocks apply. Premium, sentiment, and prints describe the session tape; GEX and IV are the recap's T+1 / prior-close snapshots, not a live intraday gamma map. Neutral premium supplies no direction, and call share is option type, not bullish sentiment. Net DEI is an unsigned magnitude relative to typical activity; Net DEX is a separate signed classification, and a +0M reading rounds to zero. GEX is modeled chain structure under TradingFlow's dealer-sign convention, not observed dealer inventory, a support level, or the next session's direction. Ticket tags do not prove who bought or sold or whether a position opened, and intraday_pct is a first-to-last underlying-price proxy from the option tape, not a verified daily return.
Reproduce the findings
- Open the October 16 recap; confirm Oct 16, 2026 in the session KPI.
- Open the October 15 recap beside it and compare the KPI strip, leaders, and all six index GEX rows.
- Compare MU's leaders-table tag, headline cards, and largest tickets on both days.
- Read Steps 4–6 separately: exposure magnitude, volatility rank, and index structure.
TradingFlow App Home → Cookbooks → Daily Market Recap → select the completed session.
Related reading
Related Articles
October 20 Recap: SPX GEX Widens to −$36.72B as SPY and IWM Turn Positive
$12.6B in single-name premium, 25% bullish versus 26% bearish. MU led at $1.2B Mixed; SPX GEX was −$36.72B.
October 19 Recap: SPX GEX Shrinks to −$11B From −$143.34B
$14.2B in single-name premium, 25% bullish versus 24% bearish. MU led at $1.6B Mixed; SPX GEX was −$11B.
October 15 Recap: Leaned Bullish, MU $2.8B Bullish, SPX GEX Negative
$27.1B in single-name premium, 27% bullish versus 24% bearish. MU led at $2.8B Bullish; SPX GEX was −$13.69B.