C3.ai (AI) Stock Trading Hours & Best Sessions

C3.ai trades on the NASDAQ under the ticker AI, with three distinct daily sessions. Pre-Market runs from 10:00 to 14:30 UTC, the Regular session opens at 14:30 UTC and closes at 21:00 UTC, and After-Hours extends from 21:00 to 01:00 UTC. Unlike forex markets that run 24/5 with overlapping liquidity pools, equity sessions are hard-bounded — volume and participation drop sharply outside the Regular window. Pre-market activity often reacts to overnight news, analyst upgrades, or macro data releases, but participation is thin compared to the Regular session. After-Hours trading, while accessible through most brokers, typically sees spreads on AI stock widen to 3–5x their Regular-session levels, making precise entries significantly harder to execute.

The single most active window for AI stock is 14:30–16:30 UTC — the first two hours after the Regular session opens. This corresponds to 09:30–11:30 AM New York time (ET), 14:30–16:30 London time (BST in summer, GMT+1), and 23:30–01:30 Sydney time (AEDT). Volume during this window routinely runs 40–60% of the entire daily total, based on historical NASDAQ data from 2022–2024. A secondary spike appears between 19:30–21:00 UTC (the final 90 minutes before close), driven by institutional rebalancing and retail momentum trades. Compared to the midday lull between 17:00–19:00 UTC — when spreads widen and order flow thins — these two bookend windows offer the most favorable conditions for both entries and exits.

Spread behavior on AI stock follows a predictable pattern tied directly to participation levels. During peak Regular-session hours (14:30–16:30 UTC), bid-ask spreads on AI typically sit in the range of $0.01–$0.03 per share. Move into Pre-Market territory and spreads can expand to $0.10–$0.25, reflecting the absence of market makers running full books. After-Hours spreads are the widest of all — sometimes exceeding $0.50 on low-volume days — which erodes edge on any short-term strategy. Whereas a scalper targeting a $0.30 move during the Regular session faces manageable spread costs, the same trade in After-Hours could see spread alone consume 50% of the target profit. Pulsar Terminal displays real-time spread data directly on your MetaTrader 5 panel, making it straightforward to spot when AI spreads are expanding beyond the Regular-session baseline before you place an order.