Compare · FISN vs VST

FISN vs VST

Side-by-side comparison of Deep Fission Inc. (FISN) and Vistra Corp. (VST): market cap, price performance, sector, and recent activity on the wire.

Summary

  • Both FISN and VST operate in Electric Utilities: Central (Utilities), so they compete in similar markets.
  • VST is the larger of the two at $41.89B, about 384.3x FISN ($109.0M).
  • Over the past year, FISN is down 87.8% and VST is down 32.4% - VST leads by 55.4 points.
  • VST has been more active in the news (9 items in the past 4 weeks vs 2 for FISN).
  • VST has more recent analyst coverage (25 ratings vs 0 for FISN).
PerformanceFISN-87.80%VST-23.79%
2026-06-18+0.00%2026-11-06
MetricFISNVST
Company
Deep Fission Inc.
Vistra Corp.
Price
-
-
Market cap
$109.0M
$41.89B
1M return
-60.62%
-20.07%
1Y return
-87.80%
-32.44%
Industry
Electric Utilities: Central
Electric Utilities: Central
Exchange
NASDAQ
NYSE
IPO
2026
News (4w)
2
9
Recent ratings
0
25
FISN

Deep Fission Inc.

Deep Fission is developing technology that places a small modular pressurized water reactor in a borehole approximately one mile underground. The Company's Gravity Nuclear Reactor approach combines established pressurized water reactor technology with a novel underground deployment model designed to simplify construction, enhance safety, and support scalable commercial deployment. Deep Fission is focused on delivering reliable, low-carbon baseload power to meet growing electricity demand from utilities, industrial customers, and data centers. The Company is currently advancing the development of its first reactor project in Parsons, Kansas, and was selected for the U.S. Department of Energy's Reactor Pilot Program.

VST

Vistra Corp.

Vistra Corp., together with its subsidiaries, engages in the electricity business in the United States. It operates through six segments: Retail, Texas, East, West, Sunset, and Asset Closure. The company retails electricity and natural gas to residential, commercial, and industrial customers across 20 states in the United States and the District of Columbia. It is also involved in the electricity generation, wholesale energy sales and purchases, commodity risk management, fuel production, and fuel logistics management activities. The company serves approximately 4.5 million residential, commercial, and industrial customers. It has a generation capacity of approximately 38,700 megawatts with a portfolio of natural gas, nuclear, coal, solar, and battery energy storage facilities. The company was formerly known as Vistra Energy Corp. and changed its name to Vistra Corp. in July 2020. Vistra Corp. was founded in 1882 and is based in Irving, Texas.