
Quantum-Si (QSI) Pre-Market
Date | Pre-market Price | Pre-market High | Pre-market Low |
---|---|---|---|
Aug 25, 2025 | $1.13 | $1.14 | $1.13 |
Data last updated Aug 25, 2025 9:30 AM EST.
Quantum-Si (QSI) Pre-Market Trading Summary
As of 9:30 AM EST on August 25, Quantum-Si (QSI) is trading at $1.13 in the pre-market session. This reflects an decrease of -$0.01 (-0.88%) compared to the previous market session close of $1.14.
So far today, QSI stock has traded between a low of $1.13 and a high of $1.14 during pre-market hours. The latest trade was recorded at $1.13.
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
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
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
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
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
Date | Pre-Market Open | Pre-Market Close | Change |
---|---|---|---|
Aug 25, 2025 | $1.15 | $1.13 | -1.74% |
Aug 22, 2025 | $1.13 | $1.10 | -2.65% |
Aug 21, 2025 | $1.02 | $0.99 | -2.76% |
Aug 20, 2025 | $1.04 | $1.01 | -2.88% |
Aug 19, 2025 | $1.11 | $1.14 | +2.70% |
Aug 18, 2025 | $1.13 | $1.10 | -2.65% |