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Market Analysis10 min read

September 25 Recap: Balanced Tape, MU $1.7B, SPX GEX Positive

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Daily Market Recap on the completed September 25 session printed $15.6B of single-name premium, 70% in calls, with tone balanced at 22% bullish vs 23% bearish. MU led at $1.7B (Mixed). SPX GEX was Positive at +$80.06B, and Rank showed SPY and SPXW closing between their 0DTE put wall and 0DTE top.

This is a Daily Market Recap readout of the completed September 25, 2026 session, with a Rank check on SPY and SPXW. It is not a trade.

Two clocks sit in the same report:

  1. Session tape — single-name (STOCK) premium, sentiment, timing, and movers from AggregatedOptionTrades, plus the session OHLC.
  2. TradingFlow GEX / IV — prior-close chain and meta snapshots (T+1). They do not recompute live 0DTE books.

The session was balanced at 22% bullish vs 23% bearish, with $15.6B of single-name premium and 70% of it in calls. The heaviest name was MU ($1.7B, Mixed). Index GEX was Positive on SPX at +$80.06B. On Rank, SPY closed 771.40 between its $770 0DTE put wall and $772 0DTE top, and SPXW closed 7,743.40 between 7,740 and 7,745. That is the finding.

Diagram of the September 25 session: $15.6B single-name tape, balanced 22/23, MU $1.7B, SPX GEX Positive, SPY and SPXW closes inside the 0DTE band

Tape versus T+1 structure. Sentiment, premium, and OHLC are the session. GEX is prior-close. Neither row is a forecast.

Readers with access can open Daily Market Recap or the dated run market-recap~2026-09-25. Sign-in and an eligible trial or subscription may be required.

What the recap printed

Daily Market Recap header for September 25, 2026, with $15.6B total premium, 70% calls, 30% puts, and 22% bullish vs 23% bearish

Test app, official Daily Market Recap, session 2026-09-25. KPI strip is the session tape. Captured September 28, 2026.

On this run:

  • Session: Sep 25, 2026 (latest completed)
  • Total premium: $15.6B (single-name)
  • Call premium: 70% · put premium: 30%
  • Bullish: 22% · bearish: 23%
  • Tone: balanced
  • Largest sentiment bucket: NEUTRAL $8.6B (bearish $3.6B, bullish $3.5B)
  • Heaviest name: MU $1.7B (glance and leaders table agree)
  • Bottom-line mover: VIAV +7.4%

A week earlier, September 18 printed $20.8B, 74% calls, and leaned bullish 24% vs 19%. This session is smaller, still call-heavy, and the bullish edge is gone.

Neutral premium (spreads, hedges, two-sided prints) is not directional. Tone is the bullish-versus-bearish gap, not the neutral bucket. Here the gap is one point, bearish side.

Session tone for September 25: Neutral $8.6B, bearish $3.6B, bullish $3.5B

Same run, Step 1. Neutral is more than half the tape. Bearish and bullish are within $0.1B. Captured in the test app on September 28, 2026.

Bottom line and the day in one glance for September 25, 2026

Same run, Bottom line and glance table. Captured in the test app on September 28, 2026.

Glance, one reading per axis:

AxisSymbolReading
Most option premiumMU$1.7B
Largest Net DEXMSFT+2M shares-equiv.
Largest Net DEI magnitudeTSLA245%
Highest IV rankINTC47 / 100
Index gamma regimeSPXPositive

Leaders: MU $1.7B Mixed

Top names by option premium on September 25, led by MU $1.7B Mixed

Test app, Step 2, session 2026-09-25. Color is net bias on that name, not a forecast. Captured September 28, 2026.

Top of the book:

SymbolPremiumCallPutNet bias
MU$1.7B$1.2B$502MMixed
META$1.3B$878M$429MMixed
TSLA$1.1B$777M$366MBearish
AMD$1.1B$857M$218MMixed
MSFT$733M$578M$155MBullish
SNDK$646M$359M$287MMixed

Three of the top four are Mixed. TSLA is about two-thirds calls ($777M of $1.1B) and still tagged Bearish. MSTR ($531M, $470M calls) and NVDA ($530M, $401M calls) are also call-heavy and tagged Bearish. Call share is not net bias. MSFT is the only top-five name tagged Bullish.

First recorded window: 09:30, $2.8B. Timing alone does not prove intent.

Largest Net DEI: TSLA 245%, associated Net DEX Negative. Largest Net DEX: MSFT +2M shares-equivalent. DEI is unsigned magnitude versus typical volume; DEX is a separate signed classification. Neither proves trader identity or dealer inventory.

Highest IV rank among active names: INTC 47, 30-day IV 73.5%. IV rank is where that name's 30-day implied vol sits in its own past year.

Index GEX: SPX Positive +$80.06B

Index GEX backdrop for September 25: SPX +80.06 Positive, IWM −0.04 Negative

Test app, Step 6, session 2026-09-25. GEX is prior-close structure (T+1) under the product dealer-sign convention. Captured September 28, 2026.

IndexNet GEX ($B)Regime
SPX+80.06Positive
SPY+6.69Positive
NDX+2.37Positive
QQQ+2.04Positive
DIA+0.3Positive
IWM−0.04Negative

Five of six indexes are Positive. IWM is Negative by −$0.04B, close to zero. September 18 had SPX at −$63.48B Negative. These are two snapshots a week apart, not a measured path between them. Positive GEX here is modeled structure, not observed dealer inventory, and not a floor.

Rank: both books closed inside the 0DTE band

The recap's index row is one number per index. Rank Symbols shows where that structure sat around price. Same session, Gamma Exposure, horizon Today · 0DTE.

Session OHLC (Rank daily bar):

SymbolOpenHighLowClosePrior close (Sep 24)
SPY768.80772.30766.30771.40767.20
SPXW7,709.907,752.107,693.107,743.407,704.10

SPY 0DTE: close 771.40, between 770 and 772

Annotated Rank Symbols Gamma Exposure for SPY 0DTE on September 25, 2026, with callouts on the positive regime and the close between the $770 put wall and $772 0DTE top

Test app, session 2026-09-25, horizon Today · 0DTE. Callout 1 is the lock: positive gamma, 0DTE 22.4% of all-expiry gross. Callout 2 is close versus the $770 put wall and $772 0DTE top. GEX is prior-close structure (T+1). Structure built 5:41 PM EDT. Captured September 28, 2026.

On this snapshot:

  • Environment: Positive
  • Net GEX: +$4.6B (gross $11.7B)
  • Call wall / magnet / 0DTE top: $772.00 (54.6% of selected-range gross GEX)
  • Put wall: $770.00 (5.0%)
  • Flip: $770.59
  • 0DTE share of all-expiration gross: 22.4%
  • Close: $771.40

More than half of this 0DTE book's selected-range gross sits on $772. The high (772.30) went thirty cents through it. The low (766.30) ran under the put wall and the flip. The close came back between them. All-expiration SPY is also Positive (net +$6.4B, gross $52.4B) with the same $772 top, $770 put wall, and flip $770.09.

SPXW 0DTE: close 7,743.40, between 7,740 and 7,745

Cash SPX 0DTE lives on SPXW.

Annotated Rank Symbols Gamma Exposure for SPXW 0DTE on September 25, 2026, with callouts on the positive regime and the close between the 7,740 put wall and 7,745 0DTE top

Same session, SPXW, horizon Today · 0DTE. Callout 1 is the lock: positive gamma, 0DTE 33.8% of all-expiry gross. Callout 2 is close versus the 7,740 put wall and 7,745 top. Structure built 5:41 PM EDT. Captured in the test app on September 28, 2026.

On this snapshot:

  • Environment: Positive (net GEX +$58.7B, gross $106.5B)
  • Call wall / magnet / 0DTE top: $7,745 (46.6% of selected-range gross GEX)
  • Put wall: $7,740 (16.5%)
  • Flip: $7,731.33
  • 0DTE share of all-expiration gross: 33.8%
  • Close: 7,743.40

The close was 1.60 under the 7,745 top. All-expiration SPXW is Positive (net +$116.2B, gross $314.9B), with the same 7,745 top, a put wall at 7,700, and flip 7,693.70. The session low (7,693.10) was sixty cents under that all-expiry flip. Price then closed at the top of the 0DTE band.

Two books, one shape: a Positive 0DTE book with most gross on the top strike, and a close just under it. That is a description of one session against T+1 structure, not a pin forecast for the next one.

Headline name: MU at $1,082

MU headline cards: last $1,082, $1.7B premium, 71% calls, 19% bullish, 75% average IV

Test app, Step 8, session 2026-09-25. Headline name is the heaviest premium, not the biggest percent mover. Captured September 28, 2026.

MU on this run:

  • Last: $1,082
  • Option premium: $1.7B
  • Call share: 71%
  • Bullish share: 19%
  • Average IV on traded contracts: 75%

Biggest prints (as the recap listed them):

TimeTypeStrikeExpiryPremiumSentiment
10:17CALL1,0002026-10-02$38MBEARISH
10:19CALL1,0002026-10-02$26MBULLISH
14:55PUT1,0802026-12-18$18MBULLISH
09:34CALL6002027-06-17$11MNEUTRAL
13:53PUT1,8402028-01-21$10MNEUTRAL

MU biggest prints on September 25, led by a $38M Bearish 1,000 call for October 2

Same run, Step 8 prints table. The same Oct-2 1,000 call printed Bearish $38M and, two minutes later, Bullish $26M. Captured September 28, 2026.

The largest MU print is the Oct-2 1,000 call, tagged Bearish at $38M. The same contract printed Bullish $26M at 10:19 (and another $10M Bullish in the same minute). A Dec 1,080 put is tagged Bullish. Sentiment is feed-precomputed per ticket; a call is not automatically bullish and a put is not automatically bearish. 71% call share on MU is not the same as a 19% bullish tape on MU.

Movers: VIAV +7.4% and ONT −15.6%

The recap prints two mover readings. They are not the same field.

  • Bottom line: "the day's biggest mover was VIAV, up 7.4%."
  • Step 7 key result: leading mover ONT, −15.6%, direction Down.

Biggest movers on September 25: ONT down, VIAV up

Test app, Step 7, session 2026-09-25. intraday_pct is an in-tape first-to-last underlying-price proxy. Captured September 28, 2026.

ONT is the largest down bar; VIAV is the largest up bar. The recipe does not merge them into one "biggest mover." Quote both. Movers are not intent.

What this session is evidence of

QuestionTradingFlow on Sep 25Clock
How large was the single-name tape?$15.6B, 70% callsSession premium
Did the tape lean?Balanced, 22% bullish vs 23% bearish; Neutral $8.6BSession sentiment
Where did the dollars go?MU $1.7B Mixed; META $1.3B Mixed; TSLA $1.1B BearishSession leaders
When did premium arrive?First window 09:30 $2.8B30-minute buckets
What was index GEX?SPX +$80.06B Positive; IWM −$0.04B NegativeT+1 snapshot
Where did SPY close versus same-day structure?771.40, between put wall $770 and 0DTE top $772 (54.6%)T+1 0DTE GEX + session OHLC
Where did SPXW close versus same-day structure?7,743.40, between put wall 7,740 and 0DTE top 7,745 (46.6%)T+1 0DTE GEX + session OHLC
What did MU print?Last $1,082, 71% calls, 19% bullish; largest print 1,000C Oct-2 $38M BearishHeadline name + tape
Biggest mover?Bottom line VIAV +7.4%; Step 7 key ONT −15.6%Two recap fields

One session is not a trend. Proxies (intraday_pct, simplified GEX) are descriptive estimates, not price forecasts.

Reproduce the findings

  1. Open Daily Market Recap and lock session Sep 25, 2026 (or open market-recap~2026-09-25).
  2. Record the KPI strip: total premium, call/put share, bullish/bearish share, and the Bottom line sentence.
  3. Step 2: confirm MU $1.7B Mixed at the top of premium, and TSLA tagged Bearish on a call-heavy mix.
  4. Step 6: confirm SPX +80.06 Positive and IWM −0.04 Negative.
  5. Step 7 and Step 8: write down VIAV +7.4% and ONT −15.6% as separate fields, then the MU 10:17 and 10:19 Oct-2 1,000 call prints with opposite tags.
  6. Open SPY Gamma Exposure → horizon Today · 0DTE. Record environment, walls, flip, and the daily OHLC. Repeat for SPXW. Sign-in and a paid Rank entitlement may be required.
  7. Stop before "therefore buy MU" or "therefore the next session pins 772 / 7745."

TradingFlow App Home → Cookbooks → Daily Market Recap for the session lock → Rank Symbols for walls and flip.

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