The Expiry BriefA daily brief on same-day (0DTE) options, dealer hedging and the GEX levels that move the close.https://expirybrief.com/SPY sits on its gamma flip at 774 as META and TSLA earnings loomhttps://expirybrief.com/daily-options-brief-2026-10-21/https://expirybrief.com/daily-options-brief-2026-10-21/An intraday read at 3:54 PM ET: SPY and QQQ trade just under the level where dealer gamma turns positive, with $4.31 of straddle priced for tomorrow.Wed, 21 Oct 2026 00:00:00 GMTMarket WrapExpiry Brief Desk