Where was dealer gamma on SPX days that moved 1% or more?

SPX sessions moving 1% or more · 178 sessions · the archive filtered by the dealer book · all sessions · the calendar

Short answer. 178 of 1,103 archived SPX sessions matched. Of them 67% closed above the zero-gamma flip (archive 84%) and 28% held the expected-hold band (archive 60%). Counts over finished sessions, recomputed as the archive grows; a share equal to the archive's is a base rate, not a pattern.

178 of 1,103 sessions match. Of them 67% closed above the flip (archive 84%), 28% held the expected-hold band (archive 60%), mean open-to-close move 1.63% (archive 0.60%).

Every row is a finished SPX session and links to its page, where the same numbers stand with the day's events and a free minute-by-minute replay. The filters are the closing measurements those pages print: the zero-gamma flip against the close and the open, the net-gamma percentile, how often the flip was crossed, whether the expected-hold band held, and the calendar event the day carried. The shares above are counts over the matched days next to the same counts over the whole archive; a share that matches the archive is a base rate, not a pattern.

SessionCloseMoveFlipvs flipPctlCrossBandEvents
2026-08-047,736.35+1.31%7,745.1-8.8288brokeHousing, JOLTS
2026-08-037,600.47+1.06%7,452.4+148.11002brokeISM, Housing, Fed, Refunding
2026-07-297,317.75-1.35%7,272.6+45.103brokeVIX settlement, EIA, FOMC
2026-06-177,420.70-1.31%7,397.2+23.5932brokeRetail sales, VIX settlement, EIA, FOMC
2026-06-117,393.92+1.35%7,306.3+87.6912brokePPI, Claims, EIA, Fed, Auctions
2026-06-107,267.52-1.08%7,189.3+78.2760heldCPI, VIX settlement, EIA, Auctions
2026-06-057,384.59-1.98%7,377.3+7.362brokeNFP
2026-04-136,886.26+1.28%6,891.2-4.9816broke
2026-04-026,582.42+1.39%6,525.0+57.41002brokeClaims, EIA
2026-03-316,528.50+1.69%6,250.6+277.9760heldConfidence, JOLTS
2026-03-306,344.00-1.19%6,284.2+59.8990heldFed
2026-03-276,369.70-1.16%6,306.9+62.81000brokeUMich
2026-03-206,506.42-1.18%6,429.4+77.0970brokeOpex
2026-03-136,631.49-1.18%6,574.8+56.7960heldPCE, Housing, GDP, JOLTS, UMich
2026-03-096,795.55+1.63%6,574.3+221.342broke
2026-03-026,881.05+1.10%6,759.9+121.2950heldISM
2026-02-236,837.67-1.01%6,771.5+66.2641heldHousing
2026-02-206,909.09+1.06%6,805.7+103.41001heldPCE, GDP, UMich, Housing, Opex
2026-02-126,832.81-1.87%6,782.2+50.6980heldClaims, EIA, Auctions
2026-02-066,931.92+1.36%6,786.0+145.9992brokeUMich
2026-02-036,917.89-1.02%6,828.9+89.0920held
2025-12-176,722.06-1.21%6,697.9+24.21001heldVIX settlement, EIA, Auctions
2025-11-256,766.32+1.03%6,646.2+120.1770brokePPI, Retail sales, Confidence, Auctions
2025-11-206,539.17-3.04%6,518.4+20.89612brokeNFP, Claims, EIA
2025-11-136,737.27-1.20%6,690.3+47.0901heldEIA, Auctions
2025-10-106,552.80-2.81%6,541.3+11.5360heldUMich
2025-08-226,466.52+1.25%6,385.9+80.6990heldFed, UMich
2025-07-316,341.46-1.01%6,272.4+69.11512brokePCE, Claims, EIA
2025-05-195,963.97+1.04%5,851.7+112.31000held
2025-04-305,563.40+1.58%5,349.5+213.91000heldPCE, GDP, Refunding, VIX settlement, EIA
2025-04-245,484.65+1.96%5,220.4+264.31000heldHousing, Claims, EIA, Auctions
2025-04-225,287.57+1.51%5,140.3+147.3990heldAuctions
2025-04-215,159.90-1.34%5,114.3+45.61004broke
2025-04-165,274.90-1.27%5,138.7+136.21000heldRetail sales, VIX settlement, EIA, Auctions, Fed
2025-04-115,360.72+1.90%5,182.1+178.6370heldPPI, UMich
2025-04-105,268.22-1.47%5,234.2+34.0682brokeCPI, Claims, EIA, Auctions
2025-04-095,454.52+10.00%5,453.0+1.5833brokeVIX settlement, EIA, Auctions
2025-04-084,987.15-4.77%5,026.0-38.9117brokeAuctions
2025-04-075,063.06+3.30%5,035.1+28.08314brokeHalts
2025-04-045,074.67-3.70%5,076.0-1.3833brokeNFP, Fed
2025-04-025,672.04+1.79%5,530.2+141.81001heldHousing, VIX settlement, EIA
2025-03-315,611.40+1.61%5,597.2+14.2921broke
2025-03-285,579.60-1.72%5,547.2+32.41001brokePCE, UMich
2025-03-265,712.15-1.12%5,706.4+5.8990brokeHousing, VIX settlement, EIA, Auctions
2025-03-145,638.54+1.23%5,539.0+99.5790heldUMich
2025-03-135,521.45-1.11%5,503.6+17.8900brokePPI, Claims, EIA, Fed, Auctions
2025-03-105,614.39-1.34%5,534.3+80.1690held
2025-03-055,841.37+1.00%5,627.9+213.5710heldHousing, VIX settlement, ISM, EIA, Fed
2025-03-035,849.17-2.04%5,819.7+29.504brokeISM, Housing
2025-02-285,952.72+1.50%6,305.7-353.001brokePCE, UMich, Opex
2025-02-275,862.32-2.05%5,855.7+6.6750heldHousing, GDP, Claims, EIA
2025-02-216,013.52-1.60%5,987.6+25.9310heldOpex
2025-02-076,026.10-1.02%5,986.1+40.01000heldNFP
2025-01-075,908.07-1.50%5,899.4+8.7930brokeJOLTS, Auctions
2024-12-205,933.15+1.63%5,921.5+11.67717brokePCE, Opex
2024-12-185,872.81-2.88%5,971.1-98.305brokeHousing, VIX settlement, EIA, FOMC
2024-10-315,705.57-1.11%5,681.4+24.21000heldPCE, Claims, EIA
2024-09-115,554.32+1.29%5,616.0-61.702brokeCPI, VIX settlement, EIA, Auctions
2024-09-065,409.24-1.94%5,364.8+44.49137brokeNFP
2024-09-035,527.82-1.55%5,512.5+15.3991brokeISM, Housing
2024-08-225,571.35-1.23%5,537.9+33.5800heldClaims, EIA
2024-08-085,321.16+1.23%5,231.9+89.3131heldClaims, EIA, Auctions
2024-08-075,200.16-1.89%5,221.8-21.68110brokeVIX settlement, EIA, Auctions
2024-08-055,187.74+1.20%5,080.9+106.8116brokeISM, Fed
2024-08-015,445.16-1.80%5,369.4+75.8906brokeClaims, ISM, Housing, EIA
2024-07-245,427.81-1.46%5,422.1+5.7873brokeHousing, VIX settlement, EIA, Auctions
2024-05-235,267.81-1.26%5,241.0+26.8971heldHousing, Claims, EIA
2024-04-305,036.57-1.21%5,043.8-7.208brokeConfidence
2024-04-155,061.25-1.99%5,067.1-5.904brokeRetail sales
2024-04-045,148.32-1.98%5,166.1-17.8554brokeClaims, EIA
2024-01-314,845.54-1.15%4,843.2+2.3614brokeRefunding, VIX settlement, EIA, FOMC
2024-01-194,837.67+1.01%4,747.7+90.0784heldOpex
2024-01-084,763.77+1.28%4,679.1+84.7881held
2023-12-204,699.15-1.25%4,772.0-72.801brokeVIX settlement, EIA, Auctions
2023-12-134,706.61+1.29%4,592.8+113.8960heldPPI, VIX settlement, EIA, FOMC
2023-11-104,416.12+1.16%4,380.1+36.0742brokeUMich
2023-10-204,223.91-1.07%4,193.9+30.01001heldOpex
2023-10-194,278.11-1.04%4,287.6-9.535brokeClaims, EIA
2023-10-094,335.17+1.07%4,320.9+14.31004broke
2023-10-064,307.81+1.74%4,201.8+106.0900heldNFP
2023-09-214,329.91-1.05%4,337.7-7.8210brokeClaims, EIA
2023-09-204,401.82-1.15%4,409.4-7.67510brokeVIX settlement, EIA, FOMC
2023-08-294,498.77+1.48%4,393.9+104.91002heldConfidence, JOLTS, Auctions
2023-08-244,376.61-1.71%4,384.5-7.9629brokeHousing, Claims, EIA
2023-08-174,373.20-1.08%4,371.6+1.667brokeClaims, EIA
2023-07-274,538.94-1.33%4,539.7-0.83712brokeHousing, GDP, Claims, EIA, Auctions
2023-06-154,426.62+1.38%4,344.1+82.5994brokeRetail sales, Claims, EIA
2023-05-264,205.21+1.10%4,211.3-6.147brokePCE, Housing, UMich
2023-05-184,198.80+1.05%4,261.6-62.825brokeClaims, EIA
2023-04-274,135.57+1.37%4,045.7+89.9910heldGDP, Claims, EIA, Auctions
2023-04-254,072.09-1.15%4,072.2-0.11228brokeHousing, Confidence
2023-04-134,146.20+1.03%4,149.9-3.701brokePPI, Claims, EIA, Auctions
2023-03-314,109.76+1.14%4,014.3+95.500brokePCE
2023-03-243,971.87+1.02%3,968.1+3.847brokeHousing, UMich
2023-03-223,936.62-1.62%3,906.4+30.2813brokeVIX settlement, EIA, FOMC
2023-03-163,960.81+2.36%3,944.6+16.210010brokeHousing, Claims, EIA
2023-03-103,861.60-1.16%3,863.4-1.813brokeNFP, UMich
2023-03-093,917.82-2.06%3,950.9-33.101brokeClaims, EIA, Fed, Auctions
2023-03-073,986.70-1.49%3,963.3+23.4972heldVIX settlement, Fed
2023-03-034,045.96+1.24%4,048.0-2.051brokeISM
2023-03-023,979.92+1.18%3,893.2+86.71000brokeClaims, EIA
2023-02-213,997.21-1.12%3,976.6+20.63528broke
2023-02-094,081.49-1.74%4,089.5-8.029brokeClaims, EIA, Auctions, Fed
2023-02-074,165.82+1.61%4,171.1-5.3011broke
2023-02-014,117.72+1.30%4,116.5+1.27710brokeRefunding, VIX settlement, ISM, JOLTS, Housing, EIA, FOMC
2023-01-314,076.19+1.23%4,053.0+23.2995brokeConfidence
2023-01-254,015.00+1.15%4,005.9+9.11004brokeVIX settlement, EIA, Auctions
2023-01-234,019.72+1.12%4,013.1+6.61000broke
2023-01-203,971.87+1.62%3,869.2+102.700brokeOpex
2023-01-183,927.50-1.98%3,940.2-12.735brokePPI, Retail sales, VIX settlement, Auctions
2023-01-133,999.22+1.15%3,917.5+81.71000heldUMich
2023-01-063,894.32+1.50%3,983.6-89.3982brokeNFP, Housing
2022-12-283,783.65-1.19%3,777.0+6.71001brokeVIX settlement, Auctions
2022-12-153,895.91-1.35%3,856.6+39.3978brokeRetail sales, Claims, EIA
2022-12-134,020.22-1.97%4,027.2-7.03414brokeCPI, Auctions
2022-12-123,989.64+1.11%3,893.9+95.804brokeAuctions
2022-12-063,942.12-1.37%3,940.8+1.31814broke
2022-12-054,000.12-1.06%3,998.0+2.110026brokeHousing, ISM
2022-11-304,075.67+2.89%4,113.2-37.5111brokeGDP, VIX settlement, JOLTS, EIA, Fed, Opex
2022-11-103,954.42+1.62%3,954.5-0.18610brokeCPI, Claims, EIA, Auctions
2022-11-093,749.47-1.47%3,723.7+25.8864brokeVIX settlement, EIA, Auctions
2022-11-023,760.95-2.27%3,792.3-31.42113brokeRefunding, VIX settlement, EIA, FOMC
2022-11-013,857.77-1.35%3,864.2-6.4024brokeISM, JOLTS, Housing
2022-10-283,901.02+2.38%3,895.9+5.11004brokePCE, UMich
2022-10-253,858.97+1.43%3,868.1-9.1961brokeConfidence
2022-10-213,753.64+2.73%3,755.3-1.7922brokeOpex
2022-10-183,720.90-1.04%3,680.6+40.37116broke
2022-10-143,586.86-2.87%3,563.8+23.11123brokeRetail sales, UMich
2022-10-133,670.01+4.81%3,674.2-4.2014brokeCPI, Claims, EIA, Auctions
2022-10-073,641.52-1.59%3,608.7+32.8980heldNFP
2022-10-043,790.70+1.43%3,636.0+154.71000heldHousing, JOLTS
2022-10-033,678.02+1.47%3,632.1+45.91000brokeISM, Housing
2022-09-303,587.67-1.32%3,556.0+31.710024brokePCE
2022-09-293,640.87-1.14%3,638.4+2.5110brokeGDP, Claims, EIA
2022-09-283,719.20+1.76%3,713.3+5.910018brokeVIX settlement, Fed, EIA, Auctions
2022-09-273,646.87-1.24%3,640.5+6.4928brokeHousing, Confidence, Auctions
2022-09-213,790.82-2.29%3,805.7-14.9846brokeVIX settlement, EIA, FOMC
2022-09-193,899.47+1.57%3,901.1-1.6018broke
2022-09-133,931.77-2.27%3,956.7-24.9011brokeCPI, Auctions
2022-09-084,005.42+1.50%3,929.4+76.0248heldClaims, Fed, EIA
2022-09-073,979.57+1.90%3,986.0-6.407brokeVIX settlement
2022-09-023,923.30-1.90%3,955.7-32.416brokeNFP, Housing
2022-08-313,956.21-1.05%3,915.1+41.14516heldVIX settlement, EIA, Opex
2022-08-303,986.71-1.39%3,929.4+57.38712brokeConfidence, JOLTS
2022-08-264,058.52-3.35%4,090.8-32.317brokePCE, Fed, UMich
2022-08-254,199.12+1.06%4,123.7+75.410026heldGDP, Claims, EIA, Auctions
2022-08-124,279.60+1.21%4,293.4-13.802brokeUMich
2022-07-294,131.17+1.10%4,120.9+10.310010brokePCE
2022-07-274,022.37+1.65%4,028.2-5.8513brokeHousing, VIX settlement, EIA, FOMC
2022-07-223,962.12-1.02%3,967.1-5.0310brokeUMich
2022-07-213,996.62+1.16%3,992.7+3.910010brokeClaims, EIA
2022-07-193,935.67+1.73%3,798.0+137.7990heldHousing
2022-07-183,830.77-1.65%3,861.8-31.0010broke
2022-07-053,831.12+1.66%3,828.2+2.99815brokeHousing
2022-06-283,822.21-2.57%3,851.4-29.211brokeConfidence, Auctions
2022-06-243,912.02+2.14%3,886.9+25.11008brokeHousing, UMich, Opex
2022-06-223,760.65+1.10%3,772.4-11.81005brokeFed, VIX settlement, Auctions
2022-06-133,751.84-1.38%3,779.6-27.813broke
2022-06-103,898.87-1.37%4,034.8-135.903heldCPI, UMich
2022-06-094,017.54-1.96%4,090.9-73.49926brokeClaims, EIA, Fed, Auctions
2022-06-074,160.42+1.84%4,111.4+49.01003broke
2022-06-024,176.36+1.98%4,174.2+2.2816brokeHousing, Claims, EIA
2022-06-014,101.00-1.39%4,130.3-29.39910brokeVIX settlement, ISM, JOLTS, Housing
2022-05-274,156.57+1.71%4,138.3+18.31000brokePCE, UMich
2022-05-264,058.55+1.67%3,981.7+76.91000heldGDP, Claims, EIA, Auctions, Fed
2022-05-253,978.00+1.23%3,976.3+1.7155brokeHousing, VIX settlement, EIA, Auctions
2022-05-233,973.02+1.01%3,974.2-1.26812broke
2022-05-183,924.20-2.87%3,961.3-37.14115brokeHousing, VIX settlement, EIA, Auctions
2022-05-134,023.25+1.24%4,062.3-39.1267brokeHousing, UMich
2022-05-113,934.19-1.40%3,919.7+14.5977heldCPI, VIX settlement, EIA, Auctions
2022-05-104,001.87-1.59%3,989.0+12.99826broke
2022-05-093,991.46-1.74%3,944.6+46.99123heldFed
2022-05-044,300.15+2.88%4,302.9-2.7124brokeRefunding, VIX settlement, ISM, EIA, FOMC
2022-04-294,131.27-2.73%4,168.8-37.501brokePCE
2022-04-264,177.05-2.16%4,189.3-12.31413brokeHousing, Confidence
2022-04-254,296.66+1.28%4,315.2-18.5619brokeRetail sales
2022-04-224,271.75-2.43%4,264.7+7.1998brokeUMich
2022-04-144,391.30-1.33%4,366.5+24.81000heldRetail sales, Claims, EIA, Opex

Turn a filter into a rule

A count is where a question starts. The Lab takes a rule in plain words ("sell the 0DTE straddle at 10:00 on days that opened below the flip with the percentile under 20"), compiles it against every archived session and reports the out-of-sample verdict with day-clustered intervals. An assistant with the MCP server can page through the same archive with list_sessions and get_session.

Measurements are model output derived from public trade and quote data; they are approximations and can be wrong. Nothing here is investment advice; see the Terms.