8-K - DEEP FISSION, INC. (0001918102) (Filer)
Published . Updated .
8-K - DEEP FISSION filed an 8-K with the SEC on Oct 20 (a notice of a material company event).
Directly affected
- FISN Deep Fission
Named in this report.
Indirectly affected
- SPY SPDR S&P 500+1.6%
The broad U.S. stock market
- TLT iShares 20+ Year Treasury Bond-1.8%
Long-term U.S. government bonds
- QQQ Invesco QQQ+2.3%
Large technology stocks
- GLD SPDR Gold Shares-3.3%
Gold can move with the broad market
Price reaction, T-5 to T+3
| Ticker | T-5 | T-3 | T-1 | T0 | T+1 | T+2 | T+3 |
|---|---|---|---|---|---|---|---|
| FISN | +9.97% | -0.55% | base | -23.22% | -28.96% | -35.25% | after close |
| SPY | +1.49% | +0.67% | base | +0.32% | +0.85% | -0.34% | after close |
| TLT | -1.40% | +0.67% | base | +0.83% | +0.98% | +2.86% | after close |
| QQQ | +3.53% | +1.38% | base | -0.15% | +0.97% | -1.91% | after close |
| GLD | +0.53% | +0.80% | base | -0.52% | -0.18% | -2.78% | after close |
Closing-price change versus T-1, the last close before the story. T0 to T+3 fill in after each market close. Prices: Alpaca IEX.
Market Call
Think this story will push the stock up or down over the next three trading days? Make a free call and see what other readers think. Points are play money with no cash value.
Filed: 2026-10-20 AccNo: 0001104659-26-117389 Size: 5 MB Item 7.01: Regulation FD Disclosure Item 9.01: Financial Statements and Exhibits
Source: sec-edgar
How far Deep Fission (FISN) has moved since 20 Oct 2026
| Company | When | Move | Status |
|---|---|---|---|
| Deep Fission (FISN) | that day | -23.22% | final price |
| Deep Fission (FISN) | the next day | -28.96% | final price |
| Deep Fission (FISN) | two days later | -35.25% | final price |
| Deep Fission (FISN) | three days earlier | -0.55% | final price |
| Deep Fission (FISN) | five days earlier | +9.97% | final price |
| GLD | that day | -0.52% | final price |
| GLD | the next day | -0.18% | final price |
| GLD | two days later | -2.78% | final price |
| GLD | three days earlier | +0.80% | final price |
| GLD | five days earlier | +0.53% | final price |
| QQQ | that day | -0.15% | final price |
| QQQ | the next day | +0.97% | final price |
| QQQ | two days later | -1.91% | final price |
| QQQ | three days earlier | +1.38% | final price |
| QQQ | five days earlier | +3.53% | final price |
| SPY | that day | +0.32% | final price |
| SPY | the next day | +0.85% | final price |
| SPY | two days later | -0.34% | final price |
| SPY | three days earlier | +0.67% | final price |
| SPY | five days earlier | +1.49% | final price |
| TLT | that day | +0.83% | final price |
| TLT | the next day | +0.98% | final price |
| TLT | two days later | +2.86% | final price |
| TLT | three days earlier | +0.67% | final price |
| TLT | five days earlier | -1.40% | final price |
Who is named in “8-K - DEEP FISSION, INC. (0001918102) (Filer)”
Companies tied to this story
- FISN Deep Fission
In “8-K - DEEP FISSION, INC. (0001918102) (Filer),” Deep Fission (FISN) is linked, with no stored direction, high confidence. Reason on file: SEC 8-K filing -> direct issuer disclosure -> FISN
How “8-K - DEEP FISSION, INC. (0001918102) (Filer)” reaches Deep Fission (FISN)
Deep Fission (FISN) is the company in “8-K - DEEP FISSION, INC. (0001918102) (Filer),” the 20 Oct 2026 this story story.
What ties Deep Fission (FISN) to the headline is this: SEC 8-K filing -> direct issuer disclosure -> FISN
The price range for Deep Fission (FISN), and the dates in the story
FISN traded between 2.58 and 4.01 across 2 sessions. The latest close on file is 2.60.
A simple score for Deep Fission (FISN)
44 out of 100
“8-K - DEEP FISSION, INC. (0001918102) (Filer)” scores 44 out of 100. The score uses 1 sources, a -29.81% difference versus the S&P 500 (SPY), and 1 linked companies.