Block Inc. (SQ) Trading Hours & Best Sessions

SQ trades across three distinct windows. Pre-Market runs from 10:00 to 14:30 UTC (6:00 AM–10:30 AM Eastern). Regular session opens at 14:30 UTC (10:30 AM Eastern) and closes at 21:00 UTC (5:00 PM Eastern). After-Hours extends from 21:00 to 01:00 UTC (5:00 PM–9:00 PM Eastern).

The regular session is where the real action lives. Block Inc. — formerly Square — is a fintech name with heavy institutional participation, and those players almost exclusively operate during regular hours. Pre-market and after-hours sessions do carry price discovery value, especially around earnings releases (SQ has moved 15%+ in after-hours on multiple quarterly reports since 2021), but liquidity thins dramatically outside the 14:30–21:00 UTC window.

The opening hour — 14:30 to 15:30 UTC (10:30–11:30 AM Eastern) — is the highest-volume window of the day. Institutional orders flood in, spreads tighten, and SQ's average true range for that single hour often exceeds 60% of the full-day range. Momentum setups and breakout entries work best here.

The second window worth targeting is 19:30 to 21:00 UTC (3:30–5:00 PM Eastern). This is the power hour. Positions get squared, late institutional flows arrive, and SQ frequently makes its second significant directional move of the day. In London time, that's 20:30–22:00 BST — late but often worth it for European traders holding intraday positions.

Mid-session — roughly 16:30 to 18:30 UTC — tends to drift. Volume drops, spreads widen slightly, and false breakouts are common. Scalpers get chopped up here.

Pre-market spreads on SQ can run 3–5x wider than regular session norms. With fewer market makers quoting, a stock that trades at a 0.01–0.02 spread during regular hours can see spreads of 0.05–0.15 before 14:30 UTC. That's a meaningful drag on any short-term trade.

During regular hours, spreads compress to their tightest levels within the first 30 minutes of the open and again during the power hour close. After-hours spreads sit somewhere between pre-market and regular — better than early morning, but still elevated enough to hurt scalpers.

Pulsar Terminal displays real-time spread data directly on your MT5 chart, so you can see at a glance when SQ's spread is widening outside those optimal regular-session windows before you commit to an entry. For anyone running a grid or multi-level SL/TP strategy on SQ, that live spread visibility matters — a wide spread can eat into your first profit target before the trade even moves.