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$DAWN All transactions

Day One Biopharmaceuticals, Inc.

M

$ Value

Shares

6,625

Price

Filed

Feb 18

Insider

Name

York Charles N II

Title

COO and CFO

CIK

0001655962

Roles

Officer

Transaction Details

Transaction Date

2026-02-15

Code

M

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

310,215

Footnotes

Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration. | The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs. | The price reported in Column 4 is a weighted average price. These shares were sold as part of block trades for multiple security holders of the Issuer at prices ranging from $11.195 to $11.8508, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein with regard to the block trade. | The RSUs will vest as to 1/16th of the total award in quarterly installments on February 15, May 15, August 15 and November 15, subject to the Reporting Person's provision of service to the Issuer on each vesting date. | RSUs do not expire; they either vest or are canceled prior to the vesting date.

Filing Info

Accession No.

0001655962-26-000004

Form Type

4

Issuer CIK

0001845337

York Charles N II's History

Date Ticker Type Value
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D
2026-04-23 DAWN D

Other Insiders at DAWN (90d)

Insider Bought Sold Last
Garland J. Scott 2026-04-23
Ramasastry Saira 2026-04-23
Holles Natalie C. 2026-04-23
Nicholson Garry A 2026-04-23
York Charles N II
COO and CFO
$70K 2026-04-23
Dable Habib J 2026-04-23
Grossman William 2026-04-23
VASCONCELLES MICHAEL
Head of Research and Dev.
$32K 2026-04-23
Dubow Adam
Gen Counsel & Secretary
$74K 2026-04-23
Josey John A. 2026-04-23
Merendino Lauren
Chief Commercial Officer
$67K 2026-04-23
Bender Jeremy
CHIEF EXECUTIVE OFFICER
$179K 2026-04-23