The July 3rd Half-Day: Low Liquidity and a Warped Dealer Map
Sandwiched against Independence Day and the peak of summer vacation season, the July 3rd session is one of the lowest-liquidity days of the year, and low liquidity is what warps a dealer map.
The session around July 3rd (frequently a 1pm ET early close ahead of the Independence Day holiday) combines two liquidity drains: a holiday half-day and the depths of summer vacation season. The result is a thin, warped tape where the dealer map behaves much like the post-Thanksgiving half-day — unreliable and easily distorted.
Why the map warps
With most desks empty, the participation that gives levels their meaning is missing. Levels hold or break on tiny volume, ranges compress to nothing or spike on a single order, and the structure carries little information. The expected move is small because realized volatility is expected to be minimal, but that thinness is exactly what makes the occasional move erratic — there's no depth to absorb any real flow that does show up.
Execution gets worse
As on any holiday-thin day, spreads widen, fills degrade, and slippage rises. For a 0DTE scalper the combination of an early close (accelerating decay and widening spreads) and skeleton liquidity is doubly punishing — you're fighting both the clock and the thin book.
July 3rd is the market on vacation. The levels are drawn in sand, the book is empty, and the clock runs out early — three good reasons to close the laptop.
The takeaway
Like the other half-days, July 3rd is usually best treated as a day off. There's little edge in a distorted, illiquid, time-compressed session, and the execution costs are elevated. If you must trade, size down, stick to the most liquid strikes, and keep expectations low. Recognizing which sessions not to trade is part of the discipline — and the summer half-days are near the top of that list.
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