8-K - Quantum-Si Inc (0001816431) (Filer)
Published . Updated .
Filed: 2026-10-15 AccNo: 0001816431-26-000068 Size: 347 KB Item 8.01: Other Events Item 9.01: Financial Statements and Exhibits
Directly affected
- QSI Quantum-Si
Named in this report.
Indirectly affected
- SPY SPDR S&P 500
The broad U.S. stock market
- TLT iShares 20+ Year Treasury Bond
Long-term U.S. government bonds
- QQQ Invesco QQQ
Large technology stocks
- GLD SPDR Gold Shares
Gold can move with the broad market
Price reaction, T-5 to T+3
Filed: 2026-10-15 AccNo: 0001816431-26-000068 Size: 347 KB Item 8.01: Other Events Item 9.01: Financial Statements and Exhibits
Source: sec-edgar
Quantum-Si (QSI) since this story, compared with the market
Since the first closing price after “8-K - Quantum-Si Inc (0001816431) (Filer),” Quantum-Si (QSI) is -2.69%. The S&P 500 fund (SPY) is +0.43% over the same days, a -3.12% difference versus the market.
| Company | When | Move | Status |
|---|---|---|---|
| GLD | that day | +1.78% | final price |
| GLD | the next day | +1.61% | final price |
| GLD | two days later | +0.98% | final price |
| GLD | three days later | +0.45% | final price |
| GLD | three days earlier | +1.65% | final price |
| GLD | five days earlier | +0.71% | final price |
| QQQ | that day | -0.11% | final price |
| QQQ | the next day | -2.63% | final price |
| QQQ | two days later | -1.46% | final price |
| QQQ | three days later | -1.62% | final price |
| QQQ | three days earlier | +2.33% | final price |
| QQQ | five days earlier | +2.54% | final price |
| Quantum-Si (QSI) | that day | -5.78% | final price |
| Quantum-Si (QSI) | the next day | -19.49% | final price |
| Quantum-Si (QSI) | two days later | -21.58% | final price |
| Quantum-Si (QSI) | three days later | -16.55% | final price |
| Quantum-Si (QSI) | three days earlier | -1.44% | final price |
| Quantum-Si (QSI) | five days earlier | -12.27% | final price |
| SPY | that day | +0.28% | final price |
| SPY | the next day | -0.82% | final price |
| SPY | two days later | -0.40% | final price |
| SPY | three days later | -0.07% | final price |
| SPY | three days earlier | +1.09% | final price |
| SPY | five days earlier | +0.55% | final price |
| TLT | that day | +1.41% | final price |
| TLT | the next day | +1.46% | final price |
| TLT | two days later | +0.74% | final price |
| TLT | three days later | +1.57% | final price |
| TLT | three days earlier | -1.08% | final price |
| TLT | five days earlier | -1.29% | final price |
Who gains and who loses around Quantum-Si (QSI)
Companies mentioned with this story
- QSI Quantum-Si
For “8-K - Quantum-Si Inc (0001816431) (Filer),” Quantum-Si (QSI) is linked, with no stored direction, high confidence. Reason on file: SEC 8-K filing -> direct issuer disclosure -> QSI
How “8-K - Quantum-Si Inc (0001816431) (Filer)” reaches Quantum-Si (QSI)
“8-K - Quantum-Si Inc (0001816431) (Filer)” (15 Oct 2026) reaches Quantum-Si (QSI) through this story.
What ties Quantum-Si (QSI) to the headline is this: SEC 8-K filing -> direct issuer disclosure -> QSI
Price levels for Quantum-Si (QSI)
QSI traded between 0.75 and 1.66 across 20 sessions. The latest close on file is 1.08.
A simple score for Quantum-Si (QSI)
44 out of 100
“8-K - Quantum-Si Inc (0001816431) (Filer)” scores 44 out of 100. The score uses 1 sources, a -18.67% difference versus the S&P 500 (SPY), and 1 linked companies.