Deep Fission, Inc. (FISN)

NASDAQ

$2.83

$-0.85

(-23.22%)

Previous Close: ⁦$3.66⁩

Market Closed

Deep Fission, Inc. (FISN) Live Price Chart

Last updated: ⁦2026-10-21 04:09:40⁩. Prices reflect the latest closing data and will resume updating on the next trading day. Stock price data is sourced from Massive.

Summary

Deep Fission, Inc. (FISN) operates in the ELECTRIC SERVICES sector and is listed on NASDAQ. The stock is currently priced at $2.83, with a market capitalization of $203.23M and a P/E ratio of --. Over the past 52 weeks, its price has ranged from $2.81 to $19.00. This page covers its latest market performance, valuation, price trends and company information.

Key Market Data

Market Cap	$203.23M
Open	$3.62
Day's High	$19.00
Day's Low	$2.81
Previous Close	$3.66
Volume	2.10M
Average Volume	310.75K
P/E Ratio	--
52-Week High	$19.00
52-Week Low	$2.81
Dividend Yield	--
Earnings Date	--

Deep Fission, Inc. (FISN) Latest Closing Stock Price

Deep Fission, Inc. (FISN) last closed at $3.66 as of 2026-10-20 23:58:00, unchanged from the previous close of $3.66.

During the latest regular trading session, FISN traded between $2.81 and $19.00, with a volume of 2.10M shares. The closing price was near the lower end and near the lower end of its 52-week range.

Deep Fission, Inc. (FISN) 7-Day Stock Price Change

Over the past seven days, Deep Fission, Inc. (FISN) moved from $4.45 to $2.83, representing a decline of 36.38% ($1.62).

The stock traded between $2.81 and $4.77 during the period. The latest price is near the lower end of the 7-day range, indicating strong downward.

The average daily volume was 501.55 thousand shares, up versus the previous seven-day period, indicating higher trading activity.

FISN 52-Week Price Position

Position in Range: 0.2%

52W Low$2.81

52W High$19.00

FISN is currently trading at $2.83, placing it 0.2% of the way from its 52-week low of $2.81 to its 52-week high of $19.00. This percentage reflects the stock's relative position within its 52-week trading range, not its valuation or future performance.

What is Deep Fission, Inc. (FISN)?

Deep Fission Inc is a nuclear energy technology company developing a small modular reactor based on established pressurized water reactor technology, with novel emplacement in deep boreholes approximately one mile below the Earth's surface. Its reactor, which is referred to as the Gravity Reactor, will leverage subsurface conditions to support key containment and operating functions, including the use of hydrostatic pressure from a water column within the borehole to support reactor operating pressure and cooling, and the surrounding geological formation to provide structural confinement and shielding. The group's focus is within the United States, where electricity demand growth, expanding digital infrastructure, and evolving energy policy.

Deep Fission, Inc. Information

Industry	ELECTRIC SERVICES
Exchange	NASDAQ
Company Website	https://www.deepfission.com

How to Buy Deep Fission, Inc. (FISN) Stock on MEXC

Eligible investors can buy real shares of Deep Fission, Inc. (FISN) through MEXC RealStocks. Follow these three steps to open a RealStocks account, transfer USDT, and place a US stock order.

Step 1: Open and Verify Your RealStocks Account

Log in to the MEXC App, go to Trade → RealStocks, and select Open Account. Complete the required account-opening and identity verification process with MEXC's partner licensed broker.

Step 2: Transfer USDT to Your RealStocks Account

Go to Wallets → RealStocks and transfer USDT from your Spot Account to your RealStocks Account. RealStocks are quoted in USD, while account funding can be completed using USDT.

Step 3: Search for FISN and Place Your Order

Open the RealStocks trading page and search for FISN. Select a market or limit order, enter the price and quantity as required, review the order details, and submit your order. Once filled, the corresponding real shares will be held in your RealStocks Account.

Frequently Asked Questions (FAQ)

1.What is Deep Fission, Inc. (FISN) stock price today?

Deep Fission, Inc. (FISN) is currently trading at $ 2.83, down 22.65% ($0.83) from the previous close of $ 3.66. Intraday prices update in real time during regular trading hours.

2.Is FISN stock going up or down today?

As of 2026-10-20 23:58:00, FISN is trading at $ 2.83, down 22.65% ($0.83) from its previous close of $ 3.66. The stock has traded between $ 2.81 and $ 19.00 during today’s regular session. Past price movements do not guarantee future results.

3.What is FISN pre-market price?

As of 2026-10-20 23:58:00, FISN is trading at $ 3.66 in pre-market trading, down 0.14% ($0.01) from the previous close of $ 3.66. Pre-market prices reflect trading activity before the regular session opens and may experience lower liquidity and higher volatility.

4.What is FISN after-hours price?

As of 2026-10-20 23:58:00, FISN is trading at $ 2.92 in after-hours trading, down 20.36% ($0.75) from the regular-session close of $ 3.66. After-hours prices may differ from the regular session’s opening price due to lower liquidity and wider bid-ask spreads.

5.Is FISN stock trading now?

FISN trades on the NASDAQ exchange during regular hours, Monday through Friday, 9:30 AM to 4:00 PM ET, excluding public holidays. Pre-market and after-hours trading are also available through select brokers outside these hours.

6.Where does FISN sit relative to its 52-week high and low?

Over the past 52 weeks, FISN has traded between a low of $ 2.81 and a high of $ 19.00. At $ 2.83, the stock is positioned 0.2% of the way from its 52-week low to its 52-week high, providing context for its current price within the one-year trading range.

7.What sector is Deep Fission, Inc. in?

Deep Fission, Inc. (FISN) operates in the ELECTRIC SERVICES sector. Sector classification helps investors compare it with companies exposed to similar market trends and competitive conditions.

8.What is Deep Fission, Inc.'s market capitalization and where is it listed?

Deep Fission, Inc. is listed on the NASDAQ exchange with a market capitalization of $ 203.23M. Market cap reflects the total market value of all outstanding shares and is commonly used to classify stocks by size.

9.How is FISN valued in terms of P/E ratio and EPS?

FISN trades at a P/E ratio of --, based on trailing-twelve-month EPS of $ -1.80. P/E ratio compares the stock price to earnings per share and is a common starting point for assessing valuation relative to peers.

10.Does Deep Fission, Inc. pay a dividend?

Deep Fission, Inc. pays an indicated annual cash dividend of $ 0.00 per share, with a current dividend yield of 0.00% based on the latest share price. Dividend policies are subject to change at the board's discretion.