Options Flow & Dark Pool — Session 20 April 2026
A one-day numeric readout of where money showed up in options markets and institutional block trades on Monday 20 April 2026 (US regular hours, 9:30 AM – 4:00 PM ET), with context from our regime model.
Methodology note (revised 5 May 2026): MPI for this session was retroactively recalculated to 64 from the originally published 56 to align with the consistent computation pipeline introduced in early May. The narrative below reflects the original session’s directional reads; the headline composite has been updated for archival consistency.
How to read this Daily Pulse →
Sections: KPI strip → top 15 options flow → top 15 dark-pool prints → MPI 9-subindex grid → regime card → observations ledger → methodology footnote.
The KPIs: total options notional, C/P ratio, dark-pool notional, MPI score, regime regime + confidence. All computed end-of-day, not real-time.
Star ratings (☆ ☆☆ ☆☆☆): conviction tier on the flow row. ☆☆☆ = persistent + large + cross-asset confirmed. ☆ = single-session noise.
What this is: retrospective end-of-session positioning summary. Not a forecast. Not a recommendation.
§1 What We SawSession readout
Options traders leaned bullish on Monday, but less aggressively than Friday. Total options premium (the total dollar value of options traded) came to USD 16.47B across 33,403 individual trades — calls USD 11.31B, puts USD 5.16B. The call-to-put ratio finished at 2.19×, which is more bullish than normal (about 1.2 standard deviations above the 90-day average of 1.42, based on 62 daily readings). That is a meaningful cool-down from Friday’s very hot 3.88× — the ratio fell by 1.69×. That kind of partial move back toward the average is what we usually see after an extreme Friday in a bull market: in our 90-day sample, 4 of 6 similar Friday spikes reverted within three sessions.
Institutions were still active off-exchange. Dark pool trades and block prints added up to USD 44.35B across 1,281 prints. Mega-cap tech was again the biggest bucket: NVDA USD 1.50B, MSFT USD 1.04B, TSM USD 0.50B, AAPL USD 0.40B, AMD USD 0.42B. Two broad-index ETFs also moved in size — IVV USD 0.90B and VOO USD 0.40B — plus LQD USD 0.47B, the big investment-grade corporate bond ETF. That LQD block fits a defensive tone: the S&P 500 fell 0.61% on Iran and Strait-of-Hormuz headlines, and buying safer bonds on a risk-off day is a classic rotation.
NVDA was the cleanest signal of the day — it showed up in both options flow AND dark pool at the top of each list. Options premium was USD 1,109M with a call/put ratio of 6.2× (biggest non-index options name), and dark pool dollar size was USD 1,496M across 19 blocks (biggest dark pool name). TSM had the most extreme call-skew of any stock: a call/put of 13.1× on USD 360M premium across 115 trades, meaning positioning was very concentrated on the bullish side. MSTR was right behind at 15.0× on USD 210M, which traders use as a Bitcoin proxy. SNDK kept the quiet accumulation pattern we flagged last week going: USD 371M across 4 blocks (ranked #13 in dark pool), extending the 15–17 April position-building stretch.
Top 15 — Options Flow by Session Premium
| Ticker | Sector | Prem (USD M) | Relative | C/P | Overlap |
|---|---|---|---|---|---|
| SPXW | Index | 1,154 | 1.7× | Very low | |
| NVDA | Info Tech | 1,109 | 6.2× | Low | |
| TSM | Info Tech | 360 | 13.1× | Low | |
| TSLA | Cons. Disc. | 331 | 1.6× | Very low | |
| MSTR | Info Tech | 210 | 15.0× | Very low | |
| MU | Info Tech | 202 | 1.3× | Very low | |
| META | Comm. Svc. | 171 | 3.7× | Low | |
| GLD | ETF | 113 | 2.8× | Low | |
| MSFT | Info Tech | 102 | 3.5× | Low | |
| AAPL | Info Tech | 99 | 4.9× | Low | |
| MRVL | Info Tech | 94 | 2.2× | Very low | |
| INTC | Info Tech | 90 | 3.0× | Very low | |
| AMZN | Cons. Disc. | 87 | 3.4× | Very low | |
| ASTS | Info Tech | 85 | 2.3× | Very low | |
| AVGO | Info Tech | 79 | 2.2× | Very low |
Top 15 — Dark Pool by Session Notional
| Ticker | Sector | Notional (USD M) | Relative | Blocks | Overlap |
|---|---|---|---|---|---|
| NVDA | IT Hardware | 1,497 | 19 | Low | |
| MSFT | IT Software | 1,043 | 8 | Low | |
| IVV | ETF | 898 | 4 | Very low | |
| GLD | ETF | 709 | 7 | Low | |
| GOOG | Media | 602 | 9 | Very low | |
| TSM | IT Hardware | 503 | 4 | Low | |
| GOOGL | Media | 468 | 4 | Very low | |
| LQD | ETF (IG credit) | 468 | 15 | Very low | |
| AMD | IT Hardware | 419 | 6 | Very low | |
| AAPL | IT Hardware | 404 | 3 | Low | |
| WMT | Retail | 397 | 8 | Very low | |
| VOO | ETF | 397 | 2 | Very low | |
| SNDK | IT Hardware | 371 | 4 | Very low | |
| META | Media | 357 | 1 | Low | |
| EWY | ETF (Korea) | 344 | 4 | Very low |
ObservationsSession-level
- The bullish skew is cooling back toward normal. Today’s call/put ratio of 2.19× is 1.69× lower than Friday’s 3.88×. It is still more bullish than average (+1.2 standard deviations above the 90-day mean) but no longer extreme. That is the typical pattern after a hot Friday in a bull market — 4 of the 6 similar cases in our 90-day sample drifted back toward normal within three sessions.
- NVDA shows up in both options flow AND dark pool at #1. Options premium $1,109M (biggest non-index) at a call/put of 6.2×, plus dark pool dollar size $1,497M across 19 blocks (also biggest). Both layers point the same direction on IT hardware.
- TSM call-skew is very extreme. A call/put of 13.1× on $360M across 115 trades — the most concentrated bullish positioning of any single name today. Fits the semiconductor theme we saw last week.
- MSTR 15× call/put. $210M of call-heavy premium on what traders use as a Bitcoin proxy. Third-highest call skew in the session.
- SNDK accumulation keeps going. $371M across 4 dark pool blocks today, extending the 15–17 April buying that totaled $5.89B. The name’s typical 20-session average is about $82M/day, so today is roughly 3.5 standard deviations hotter than normal for that ticker.
- LQD dark pool USD 468M across 15 blocks. The investment-grade corporate bond ETF landed in the top 15, consistent with buying safer bonds on a risk-off day. Worth watching whether it continues into 21 April.
- The big ETF prints are mostly housekeeping. IVV $898M, VOO $397M, EWY $344M. These look like index rebalancing flow rather than a directional bet.
- Sector call/put rankings. Info Tech 3.75×, Consumer Staples 3.08×, Financials 2.66×, Energy 2.44×. Utilities at 0.91× (slightly put-leaning — mild defense). Industrials at 1.38× were softer than the rest.
- Unusual-activity flag (5 names): GFS, NKTR, QXO, SMTC, USAR. All small-caps under $15M premium each and outside the options top 15 — none of them line up with dark pool or show up across all three signals today.
- QXO looks unusual. Two identical $12.65M put prints at the $35 strike on the unusual-activity list. Worth watching tomorrow to see if it is a hedge or a directional bet.
§2 Context — Regime & MPIConditional framework
The regime model still classifies the market as Bull, but a little less firmly than Friday. Confidence that we are in Bull slipped from 0.87 to 0.79, because Monday’s S&P 500 return of -0.61% (log return -0.00611, about 1.4 standard deviations below the typical Bull day of +0.38%) was weaker than what a Bull day normally looks like. Confidence in Neutral rose to 0.17; confidence in Crisis held at 0.04. The regime label has not changed — this kind of one-day drift is well within normal noise, since the model says Bull has a 0.94 chance of staying in the same mode day-to-day.
Our Market Posture Index (MPI) printed 64 (Bull), about +14 above neutral. Versus 17 April: Volatility 28 → 24 (VIX compressed further to 17.48, which drags the score lower on a contrarian basis); Flows 67 → 62 (equity put/call rose from 0.41 to an estimated 0.52, so slightly less bullish); Trend 76 → 74 (a small cool from the SPX drawdown); Liquidity and Breadth essentially unchanged.
§3 Signals to MonitorTuesday 21 April
NVDA — does the options-plus-dark-pool alignment continue?
Today’s dark pool dollar size: $1,497M vs the name’s 90-day average of about $1.1B/day (roughly 1.3 standard deviations above normal for NVDA). If it stays ≥$1.3B/day, the signal is real accumulation; if it drops to ≤$900M/day, today was a one-day rebalance.
TSM — does the extreme call skew hold or flush out?
Call/put 13.1× on $360M (name’s 90-day typical is about 2.4×). If it drops below 5× within two sessions, call for a directional flush; if it stays at 10× or higher, sustained positioning.
LQD dark pool — is the defensive bid sticking?
$468M into the investment-grade bond ETF on a risk-off day. Another ≥$400M day, while high-yield (HYG) lags, would mean a defensive credit rotation is forming. A one-day print alone is likely just index noise.
VIX term structure
VIX closed at 17.48 (compressed). The front two futures are near parity. Watch for compression below 17.0 (deeper complacency) or expansion above 20 (a potential regime shift for the model). Current level is near the 10th percentile of the 90-day sample.
QXO — is it a hedge or a directional short?
Two $12.65M put prints at the $35 strike, plus smaller calls at the same strike. On 21 April, if call follow-through is ≥$5M, read it as a spread trade; if puts keep dominating, read it as a directional short setup.
§4 Methodology
$100,000, US regular hours 9:30 AM–4:00 PM ET. Dark pool: institutional dark-pool data feed filtered to Block + DarkPool trade types. Public market data: S&P 500 close from the exchange tape, VIX from exchange data, credit spread from HYG and LQD closes via consolidated market data.Method note
Flow and dark-pool data sourced from our analytical pipeline. MPI score and regime classifier are our internal composite; daily synthesis is AI-assisted from those inputs.