York Charles N II

COO and CFO at Day One Biopharmaceuticals, Inc. · on record since May 26, 2021
Chief Financial Officer and VP at Spyre Therapeutics, Inc. · on record since May 19, 2016

Insider trading activity of York Charles N II

Transactions on record: 164; since Apr 12, 2016

Open-market buys: 6; $116.3K

Open-market sells: 32; $3.3M

Companies traded: 2; last filing Apr 23, 2026

Figures computed from official regulatory filings — methodology.

Companies where York Charles N II has traded

Day One Biopharmaceuticals, Inc.147 tx · $3.3M · Apr 23, 2026
Spyre Therapeutics, Inc.17 tx · $116.3K · Feb 19, 2020

Track record of York Charles N II

Statistical track record

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Open-market buys: 6

Last buy: Dec 5, 2017

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Transaction history of York Charles N II

Co-insiders of York Charles N II

This page republishes public regulatory disclosures. Concerned by this data? Exercise your right to object →

Company	Filed	Type	Qty	Price	Value · USD	Src
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-162,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-6,750	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-162,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-46,375	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-497,667	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-188,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-151,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-116,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-118,125	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-72,875	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	Other	-312,025	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-2,250	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	7,875	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Sell	-6,065	11.60 USD	$70.4K	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	2,250	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-6,625	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-6,625	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-7,875	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Jan 30, 2026	AwardD	126,000	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Jan 30, 2026	AwardD	188,000	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	Exercise	1,375	—	—	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	ExerciseD	-6,625	0.00 USD	$0	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-162,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-6,750	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-162,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-46,375	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-497,667	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-188,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-151,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-116,000	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-118,125	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	OtherD	-72,875	—	—	SEC
Day One Biopharmaceuticals, Inc.	Apr 23, 2026	Other	-312,025	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-2,250	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	7,875	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Sell	-6,065	11.60 USD	$70.4K	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	2,250	—	—	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-6,625	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-6,625	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	ExerciseD	-7,875	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Feb 18, 2026	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Jan 30, 2026	AwardD	126,000	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Jan 30, 2026	AwardD	188,000	0.00 USD	$0	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	Exercise	1,375	—	—	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	Exercise	6,625	—	—	SEC
Day One Biopharmaceuticals, Inc.	Nov 18, 2025	ExerciseD	-6,625	0.00 USD	$0	SEC