{"schema_version":1,"publisher":"Half on a Double","data_through":"2026-10-16","frequency":"end-of-day","methodology":"market-implied-carry-v1","generation":"market-implied-carry-analytics-20260917T000000Z","canonical_url":"https://halfonadouble.com/stock/BIIB","markdown_url":null,"history_url":"https://halfonadouble.com/api/v1/history/BIIB.csv","advanced_analysis_url":"https://halfonadouble.com/api/v1/analysis/BIIB.json?date=2026-10-16&public_schema=4","definitions_url":"https://halfonadouble.com/methodology.md","license_url":"https://halfonadouble.com/terms.md","disclaimer_url":"https://halfonadouble.com/disclaimer.md","symbol":"BIIB","page_tier":"B","units":{"prices":"USD per share","open_interest":"option contracts","gamma_exposure":"modeled dollar-delta change per USD 1 underlying move","gamma_exposure_normalized":"modeled gamma exposure per 100,000 open option contracts","distances":"percent of close","forward_outcomes":"close-to-close percent return"},"snapshot":{"close":232.64999389648438,"previous_close":235.35000610351562,"delta_neutral":199.86974435471166,"gamma_neutral":185.4687145299569,"gamma_max":235.11791979182766,"total_open_interest":40515,"previous_open_interest":45706,"listed_contracts":470,"listed_calls":304,"listed_puts":265,"gamma_max_distance_pct":1.0607891511234544,"delta_neutral_distance_pct":-14.089942145606937,"gamma_neutral_distance_pct":-20.279940083523222,"open_interest_change_1d_pct":-11.357371023498008,"call_open_interest":23195,"put_open_interest":17320,"put_call_open_interest_ratio":0.7467126535891356,"nearest_expiration_max_pain":220,"nearest_expiration_max_pain_expiry":"2026-10-23","nearest_expiration_max_pain_distance_pct":-5.437349765034974,"all_expiration_max_pain":190,"net_gamma_exposure":2424523.33874697,"net_gamma_exposure_per_100k_open_interest":5984260.986664125,"gamma_exposure_flip":185.4687145299569,"gamma_exposure_flip_distance_pct":-20.279940083523222,"call_wall":240,"call_wall_distance_pct":3.159254801780028,"put_wall":230,"put_wall_distance_pct":-1.139047481627473,"gamma_max_cross_direction":null,"delta_neutral_cross_direction":null,"open_interest_rank":1047},"history_summary":null,"advanced_options":{"data_through":"2026-10-16","analysis_coverage":1,"catalyst_score":null,"directional_score":null,"catalyst_reasons":[],"features":{"price":232.65,"totalOi":47450,"analysisCoverage":1,"avgIvPct":207.3,"ivRank":83.7,"iv52wHighPct":237.8,"iv52wLowPct":51.2,"frontDte":7,"termPremiumPp":1.035,"riskReversalFrontPp":42.56,"riskReversal30dPp":0.38,"butterflyFrontPp":8.13,"butterfly30dPp":0.78,"putCallOiRatio":0.73,"putCallOiFrontRatio":0.344,"putCallVolumeFrontRatio":0.226,"optionVolume":2169,"volumeOiRatio":0.045711,"netDeltaNormalized":0.295265,"dealerDeltaNormalized":-0.295259,"gexPer100kOi":22018039.936776,"vannaPer100kOi":324.55216,"charmPer100kOi":-3560088.514226,"weekendDeltaShiftPer100kOi":-10680263.435195,"ivSurfaceRangePp":54.5,"gammaFlipDistancePct":-2.170643,"maxPainDistancePct":-16.183108,"peakCallDistancePct":7.457554,"peakPutDistancePct":-16.183108},"complete_analysis_url":"https://halfonadouble.com/api/v1/analysis/BIIB.json?date=2026-10-16&public_schema=4","interpretation":"Catalyst intensity ranks unusual option pricing and activity; it does not identify the event, predict direction or recommend a trade. Directional score summarizes relative positioning under documented model conventions."},"gamma_max_cross_outcomes":[],"missing_value_semantics":"null means unavailable; it never means zero","interpretation":"These are descriptive end-of-day model outputs. Signed GEX uses the published call-positive, put-negative convention and is not observed dealer inventory. None of the fields are live prices, predictions or investment advice."}