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Quantum-Si (QSI) Pre-Market

DatePre-market PricePre-market HighPre-market Low
Oct 29, 2025$2.15$2.18$2.14

Data last updated Oct 29, 2025 9:30 AM EST.

Quantum-Si (QSI) Pre-Market Trading Summary

As of 9:30 AM EST on October 29, Quantum-Si (QSI) is trading at $2.15 in the pre-market session. This reflects an decrease of -$0.03 (-1.38%) compared to the previous market session close of $2.18.

So far today, QSI stock has traded between a low of $2.14 and a high of $2.18 during pre-market hours. The latest trade was recorded at $2.15.

Pre-market trading

How to Buy or Trade Quantum-Si (QSI) Before the Market Opens

Looking to trade Quantum-Si stock (QSI) before the market opens? Public offers access to pre-market trading between 4:00 AM and 9:30 AM ET, giving investors the flexibility to place trades outside of regular market hours. Keep in mind that extended-hours trading may involve lower liquidity and wider bid-ask spreads compared to normal sessions. Follow the steps below to get started.

  1. 1

    Sign up for a brokerage account on Public

    It's easy to get started. You can sign up an account directly on our website or by downloading the Public app for iOS or Android.

  2. 2

    Add funds to your Public account

    There are multiple ways to fund your Public account––from linking a bank account to making a deposit with a debit card or wire transfer.

  3. 3

    Choose how much you’d like to invest in Quantum-Si stock

    Navigate to the Explore page. Then, type Quantum-Si into the search bar. When you see Quantum-Si stock appear in the results, tap it to open up the purchase screen.

  4. 4

    Manage your investments in one place

    You can find your newly purchased Quantum-Si stock in your portfolio––alongside the rest of your stocks, ETFs, crypto, treasuries, and alternative assets.

Quantum-Si (QSI) Pre-Market Price History

DatePre-Market OpenPre-Market CloseChange
Oct 29, 2025$2.22$2.15-3.16%
Oct 28, 2025$2.34$2.31-1.28%
Oct 27, 2025$2.29$2.39+4.35%
Oct 24, 2025$2.35$2.32-1.28%
Oct 23, 2025$2.31$2.37+2.61%
Oct 22, 2025$2.35$2.22-5.74%
View all

FAQs About Quantum-Si (QSI) Pre-Market

As of 9:30 AM EST ET, Quantum-Si (QSI) is trading at $2.15 in the pre-market session, down -$0.03 (-1.38%) from the previous market close of $2.18. Pre-market prices reflect early trading activity before the regular market opens at 9:30 AM ET.

Quantum-Si (QSI) is currently trading down in pre-market, with a price of $2.15, which is -$0.03 (-1.38%) lower than the previous close of $2.18. Pre-market movement shows how the stock is trending ahead of the open.

As of the latest pre-market session, Quantum-Si (QSI) has traded between a low of $2.14 and a high of $2.18. These prices reflect the range of early trading activity before the regular market opens.

Pre-market trading for Quantum-Si (QSI) on Public begins at 4:00 AM ET and continues until the market opens at 9:30 AM ET. These extended trading hours let investors place orders outside the regular session, though execution and liquidity may vary.

You can trade Quantum-Si (QSI) before market open through brokerages that support extended-hours trading, such as Public. Pre-market access on Public is available from 4:00 AM to 9:30 AM ET. Get started with a Public brokerage account to trade QSI before the market opens.

Quantum-Si (QSI)

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Investments in T-bills: Not FDIC Insured; No Bank Guarantee; May Lose Value.

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