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 1,121 archived SPX sessions matched. Of them 48% closed above the zero-gamma flip (archive 55%). 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 1,121 sessions match. Of them 48% closed above the flip (archive 55%) and the mean open-to-close move was 1.63% (archive 0.59%).

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, 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 flipPctlCrossEvents
2026-08-047,736.35+1.31%7,665.7+70.7550Housing, JOLTS
2026-08-037,600.47+1.06%7,571.5+29.0650ISM, Housing, Fed, Refunding
2026-07-297,317.75-1.35%7,389.8-72.01515VIX settlement, EIA, FOMC
2026-06-177,420.70-1.31%7,478.2-57.4359Retail sales, VIX settlement, EIA, FOMC
2026-06-117,393.92+1.35%7,327.1+66.88034PPI, Claims, EIA, Fed, Auctions
2026-06-107,267.52-1.08%7,317.1-49.6353CPI, VIX settlement, EIA, Auctions
2026-06-057,384.59-1.98%7,465.8-81.2152NFP
2026-04-136,886.26+1.28%6,833.2+53.1704
2026-04-026,582.42+1.39%6,562.2+20.2857Claims, EIA
2026-03-316,528.50+1.69%6,463.2+65.3956Confidence, JOLTS
2026-03-306,344.00-1.19%6,369.2-25.2605Fed
2026-03-276,369.70-1.16%6,409.8-40.108UMich
2026-03-206,506.42-1.18%6,534.8-28.43518Opex
2026-03-136,631.49-1.18%6,654.4-22.9153PCE, Housing, GDP, JOLTS, UMich
2026-03-096,795.55+1.63%6,713.3+82.3752
2026-03-026,881.05+1.10%6,874.4+6.77512ISM
2026-02-236,837.67-1.01%6,839.5-1.8505Housing
2026-02-206,909.09+1.06%6,895.8+13.31006PCE, GDP, UMich, Housing, Opex
2026-02-126,832.81-1.87%6,874.9-42.1351Claims, EIA, Auctions
2026-02-066,931.92+1.36%6,903.0+28.91000UMich
2026-02-036,917.89-1.02%6,924.3-6.4608
2025-12-176,722.06-1.21%6,750.0-27.91112VIX settlement, EIA, Auctions
2025-11-256,766.32+1.03%6,737.6+28.81007PPI, Retail sales, Confidence, Auctions
2025-11-206,539.17-3.04%6,609.1-69.9151NFP, Claims, EIA
2025-11-136,737.27-1.20%6,768.1-30.8254EIA, Auctions
2025-10-106,552.80-2.81%6,626.0-73.1151UMich
2025-08-226,466.52+1.25%6,462.6+4.0454Fed, UMich
2025-07-316,341.46-1.01%6,385.0-43.5012PCE, Claims, EIA
2025-05-195,963.97+1.04%5,945.8+18.2950
2025-04-305,563.40+1.58%5,500.0+63.4854PCE, GDP, Refunding, VIX settlement, EIA
2025-04-245,484.65+1.96%5,455.5+29.2950Housing, Claims, EIA, Auctions
2025-04-225,287.57+1.51%5,266.2+21.4708Auctions
2025-04-215,159.90-1.34%5,132.5+27.4954
2025-04-165,274.90-1.27%5,286.8-11.94013Retail sales, VIX settlement, EIA, Auctions, Fed
2025-04-115,360.72+1.90%5,329.0+31.76510PPI, UMich
2025-04-105,268.22-1.47%5,254.3+13.94523CPI, Claims, EIA, Auctions
2025-04-095,454.52+10.00%5,080.3+374.26014VIX settlement, EIA, Auctions
2025-04-084,987.15-4.77%5,082.6-95.5503Auctions
2025-04-075,063.06+3.30%5,036.6+26.55023Halts
2025-04-045,074.67-3.70%5,158.6-83.9100NFP, Fed
2025-04-025,672.04+1.79%5,645.9+26.1609Housing, VIX settlement, EIA
2025-03-315,611.40+1.61%5,564.9+46.5805
2025-03-285,579.60-1.72%5,600.0-20.402PCE, UMich
2025-03-265,712.15-1.12%5,733.0-20.8253Housing, VIX settlement, EIA, Auctions
2025-03-145,638.54+1.23%5,617.1+21.4854UMich
2025-03-135,521.45-1.11%5,542.5-21.03012PPI, Claims, EIA, Fed, Auctions
2025-03-105,614.39-1.34%5,629.6-15.2402
2025-03-055,841.37+1.00%5,812.8+28.66022Housing, VIX settlement, ISM, EIA, Fed
2025-03-035,849.17-2.04%5,908.7-59.52025ISM, Housing
2025-02-285,952.72+1.50%5,879.2+73.57013PCE, UMich, Opex
2025-02-275,862.32-2.05%5,930.5-68.23023Housing, GDP, Claims, EIA
2025-02-216,013.52-1.60%6,059.4-45.806Opex
2025-02-076,026.10-1.02%6,039.8-13.7013NFP
2025-01-075,908.07-1.50%5,937.6-29.6323JOLTS, Auctions
2024-12-205,933.15+1.63%5,944.5-11.44214PCE, Opex
2024-12-185,872.81-2.88%6,008.0-135.2321Housing, VIX settlement, EIA, FOMC
2024-10-315,705.57-1.11%5,730.8-25.256PCE, Claims, EIA
2024-09-115,554.32+1.29%5,472.2+82.1704CPI, VIX settlement, EIA, Auctions
2024-09-065,409.24-1.94%5,425.6-16.4155NFP
2024-09-035,527.82-1.55%5,559.4-31.6103ISM, Housing
2024-08-225,571.35-1.23%5,590.9-19.5105Claims, EIA
2024-08-085,321.16+1.23%5,301.0+20.1950Claims, EIA, Auctions
2024-08-075,200.16-1.89%5,263.6-63.5101VIX settlement, EIA, Auctions
2024-08-055,187.74+1.20%5,201.7-14.06521ISM, Fed
2024-08-015,445.16-1.80%5,461.4-16.2585Claims, ISM, Housing, EIA
2024-07-245,427.81-1.46%5,461.5-33.6110Housing, VIX settlement, EIA, Auctions
2024-05-235,267.81-1.26%5,300.9-33.01516Housing, Claims, EIA
2024-04-305,036.57-1.21%5,078.3-41.8153Confidence
2024-04-155,061.25-1.99%5,097.1-35.856Retail sales
2024-04-045,148.32-1.98%5,220.4-72.12511Claims, EIA
2024-01-314,845.54-1.15%4,873.8-28.31526Refunding, VIX settlement, EIA, FOMC
2024-01-194,837.67+1.01%4,808.5+29.2705Opex
2024-01-084,763.77+1.28%4,727.9+35.9650
2023-12-204,699.15-1.25%4,762.2-63.11120VIX settlement, EIA, Auctions
2023-12-134,706.61+1.29%4,680.4+26.37419PPI, VIX settlement, EIA, FOMC
2023-11-104,416.12+1.16%4,380.9+35.31008UMich
2023-10-204,223.91-1.07%4,245.7-21.81017Opex
2023-10-194,278.11-1.04%4,304.1-26.02014Claims, EIA
2023-10-094,335.17+1.07%4,309.3+25.910012
2023-10-064,307.81+1.74%4,274.1+33.8553NFP
2023-09-214,329.91-1.05%4,355.3-25.4010Claims, EIA
2023-09-204,401.82-1.15%4,439.9-38.13518VIX settlement, EIA, FOMC
2023-08-294,498.77+1.48%4,473.9+24.9750Confidence, JOLTS, Auctions
2023-08-244,376.61-1.71%4,409.1-32.5452Housing, Claims, EIA
2023-08-174,373.20-1.08%4,401.0-27.8309Claims, EIA
2023-07-274,538.94-1.33%4,575.3-36.41615Housing, GDP, Claims, EIA, Auctions
2023-06-154,426.62+1.38%4,405.8+20.8552Retail sales, Claims, EIA
2023-05-264,205.21+1.10%4,195.4+9.8800PCE, Housing, UMich
2023-05-184,198.80+1.05%4,171.5+27.3959Claims, EIA
2023-04-274,135.57+1.37%4,102.6+33.0651GDP, Claims, EIA, Auctions
2023-04-254,072.09-1.15%4,100.1-28.003Housing, Confidence
2023-04-134,146.20+1.03%4,126.8+19.4652PPI, Claims, EIA, Auctions
2023-03-314,109.76+1.14%4,082.4+27.41000PCE
2023-03-243,971.87+1.02%3,946.6+25.36518Housing, UMich
2023-03-223,936.62-1.62%3,997.2-60.65024VIX settlement, EIA, FOMC
2023-03-163,960.81+2.36%3,927.5+33.3905Housing, Claims, EIA
2023-03-103,861.60-1.16%3,887.1-25.5256NFP, UMich
2023-03-093,917.82-2.06%3,985.2-67.4457Claims, EIA, Fed, Auctions
2023-03-073,986.70-1.49%4,004.3-17.6158VIX settlement, Fed
2023-03-034,045.96+1.24%4,024.0+21.9900ISM
2023-03-023,979.92+1.18%3,955.5+24.410016Claims, EIA
2023-02-213,997.21-1.12%4,013.5-16.3306
2023-02-094,081.49-1.74%4,111.0-29.5259Claims, EIA, Auctions, Fed
2023-02-074,165.82+1.61%4,128.0+37.97513
2023-02-014,117.72+1.30%4,080.8+36.93521Refunding, VIX settlement, ISM, JOLTS, Housing, EIA, FOMC
2023-01-314,076.19+1.23%4,046.5+29.78010Confidence
2023-01-254,015.00+1.15%3,988.5+26.5751VIX settlement, EIA, Auctions
2023-01-234,019.72+1.12%4,009.7+10.09514
2023-01-203,971.87+1.62%3,932.2+39.6702Opex
2023-01-183,927.50-1.98%3,959.2-31.7155PPI, Retail sales, VIX settlement, Auctions
2023-01-133,999.22+1.15%3,978.9+20.31006UMich
2023-01-063,894.32+1.50%3,872.3+22.0855NFP, Housing
2022-12-283,783.65-1.19%3,808.3-24.6010VIX settlement, Auctions
2022-12-153,895.91-1.35%3,903.8-7.9218Retail sales, Claims, EIA
2022-12-134,020.22-1.97%4,027.1-6.91113CPI, Auctions
2022-12-123,989.64+1.11%3,959.8+29.8898Auctions
2022-12-063,942.12-1.37%3,956.2-14.1323
2022-12-054,000.12-1.06%4,016.0-15.89516Housing, ISM
2022-11-304,075.67+2.89%3,992.4+83.35820GDP, VIX settlement, JOLTS, EIA, Fed, Opex
2022-11-103,954.42+1.62%3,911.2+43.3950CPI, Claims, EIA, Auctions
2022-11-093,749.47-1.47%3,780.2-30.8012VIX settlement, EIA, Auctions
2022-11-023,760.95-2.27%3,829.5-68.62511Refunding, VIX settlement, EIA, FOMC
2022-11-013,857.77-1.35%3,862.1-4.34015ISM, JOLTS, Housing
2022-10-283,901.02+2.38%3,871.3+29.7950PCE, UMich
2022-10-253,858.97+1.43%3,841.2+17.8950Confidence
2022-10-213,753.64+2.73%3,713.1+40.68517Opex
2022-10-183,720.90-1.04%3,717.5+3.47022
2022-10-143,586.86-2.87%3,615.2-28.3155Retail sales, UMich
2022-10-133,670.01+4.81%3,574.9+95.1751CPI, Claims, EIA, Auctions
2022-10-073,641.52-1.59%3,663.1-21.6453NFP
2022-10-043,790.70+1.43%3,772.0+18.7856Housing, JOLTS
2022-10-033,678.02+1.47%3,662.6+15.4706ISM, Housing
2022-09-303,587.67-1.32%3,632.4-44.72015PCE
2022-09-293,640.87-1.14%3,639.9+0.94017GDP, Claims, EIA
2022-09-283,719.20+1.76%3,699.3+19.98512VIX settlement, Fed, EIA, Auctions
2022-09-273,646.87-1.24%3,660.0-13.13510Housing, Confidence, Auctions
2022-09-213,790.82-2.29%3,857.7-66.93025VIX settlement, EIA, FOMC
2022-09-193,899.47+1.57%3,875.9+23.610021
2022-09-133,931.77-2.27%3,984.6-52.9100CPI, Auctions
2022-09-084,005.42+1.50%3,984.7+20.8807Claims, Fed, EIA
2022-09-073,979.57+1.90%3,951.2+28.4958VIX settlement
2022-09-023,923.30-1.90%3,967.1-43.8155NFP, Housing
2022-08-313,956.21-1.05%3,981.0-24.8104VIX settlement, EIA, Opex
2022-08-303,986.71-1.39%3,992.8-6.0402Confidence, JOLTS
2022-08-264,058.52-3.35%4,116.3-57.806PCE, Fed, UMich
2022-08-254,199.12+1.06%4,168.9+30.29511GDP, Claims, EIA, Auctions
2022-08-124,279.60+1.21%4,249.5+30.110014UMich
2022-07-294,131.17+1.10%4,109.5+21.7758PCE
2022-07-274,022.37+1.65%3,995.1+27.3555Housing, VIX settlement, EIA, FOMC
2022-07-223,962.12-1.02%3,968.3-6.22513UMich
2022-07-213,996.62+1.16%3,969.8+26.89513Claims, EIA
2022-07-193,935.67+1.73%3,903.6+32.01006Housing
2022-07-183,830.77-1.65%3,873.7-42.9020
2022-07-053,831.12+1.66%3,779.5+51.6903Housing
2022-06-283,822.21-2.57%3,875.0-52.8151Confidence, Auctions
2022-06-243,912.02+2.14%3,878.5+33.5850Housing, UMich, Opex
2022-06-223,760.65+1.10%3,770.5-9.8255Fed, VIX settlement, Auctions
2022-06-133,751.84-1.38%3,778.8-27.056
2022-06-103,898.87-1.37%3,926.5-27.6012CPI, UMich
2022-06-094,017.54-1.96%4,089.3-71.8516Claims, EIA, Fed, Auctions
2022-06-074,160.42+1.84%4,132.2+28.310012
2022-06-024,176.36+1.98%4,131.3+45.1953Housing, Claims, EIA
2022-06-014,101.00-1.39%4,110.4-9.457VIX settlement, ISM, JOLTS, Housing
2022-05-274,156.57+1.71%4,123.7+32.9950PCE, UMich
2022-05-264,058.55+1.67%4,052.3+6.3650GDP, Claims, EIA, Auctions, Fed
2022-05-253,978.00+1.23%3,968.7+9.35016Housing, VIX settlement, EIA, Auctions
2022-05-233,973.02+1.01%3,960.4+12.66511
2022-05-183,924.20-2.87%3,972.4-48.2262Housing, VIX settlement, EIA, Auctions
2022-05-134,023.25+1.24%4,010.7+12.68111Housing, UMich
2022-05-113,934.19-1.40%3,987.5-53.33313CPI, VIX settlement, EIA, Auctions
2022-05-104,001.87-1.59%4,010.9-9.06413
2022-05-093,991.46-1.74%4,030.0-38.6382Fed
2022-05-044,300.15+2.88%4,207.1+93.110011Refunding, VIX settlement, ISM, EIA, FOMC
2022-04-294,131.27-2.73%4,202.8-71.54PCE
2022-04-264,177.05-2.16%4,219.0-41.91Housing, Confidence
2022-04-254,296.66+1.28%4,256.7+40.027Retail sales
2022-04-224,271.75-2.43%4,329.8-58.10UMich
2022-04-144,391.30-1.33%4,421.7-30.43Retail 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.