Deep Fission, Inc (FISN)

Deep Fission, Inc. recorded two transactions on August 26, 2025. President Ian Seth Jacobs purchased 25,000 shares, while Mark N. Tompkins sold an identical amount. Given these activities occurred over three months ago, no current market performance analysis is provided regarding these historical equity movements.

No insider activity signal

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No insider activity signal

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Ticker: FISN Exchange: NMS

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings

Insider activity signals

0 activity signals detected for Deep Fission, Inc

No insider activity signals detected

Insider trades have not triggered unusual activity signals for this company.

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Company data & Insiders

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Trades

Jacobs Ian Seth President, CEO, CFO, Secretary Executive Director

Transaction date 26 Aug 2025

Purchase

Price

185.90

Quantity 24,829 -22.3%

Value US$830,461

3.7

Tompkins Mark N. Non-Executive Director Large shareholder

Transaction date 26 Aug 2025

Sale

Price

233.73

Quantity 48,587 -1.3%

Value US$4,062,209

Notification date	Transaction date	B/S Transaction type	Insider and/or position	Nb. shares Price Value	Number of shares	Price	Value	Details
2025-08-28	2025-08-26	B Purchase	Jacobs Ian Seth President, CEO, CFO, Secretary Executive Director	24,829 -22.3% 185.90 US$830,461	24,829 -22.3%	185.90	US$830,461
2025-08-28	2025-08-26	S Sale	3.7 Tompkins Mark N. Non-Executive Director Large shareholder	48,587 -1.3% 233.73 US$4,062,209	48,587 -1.3%	233.73	US$4,062,209