Deep Fission, Inc (FISN)

Deep Fission, Inc. recorded two transactions on August 26, 2025. Mark N. Tompkins executed a sale of 25,000 shares, while Ian Seth Jacobs acquired an identical volume. These offsetting trades represent the most recent insider activity for the firm, occurring over three months ago.

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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