Jeremy Bender - 15 Feb 2026 Form 4 Insider Report for Day One Biopharmaceuticals, Inc. (DAWN)

Role
CHIEF EXECUTIVE OFFICER, Director
Signature
/s/ Charles N. York II, as Attorney-in-Fact
Issuer symbol
DAWN
Transactions as of
15 Feb 2026
Net transactions value
-$179,338
Form type
4
Filing time
18 Feb 2026, 17:14:55 UTC
Previous filing
30 Jan 2026
Next filing
27 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Bender Jeremy CHIEF EXECUTIVE OFFICER, Director 1800 SIERRA POINT PARKWAY, SUITE 200, BRISBANE /s/ Charles N. York II, as Attorney-in-Fact 18 Feb 2026 0001863107

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction DAWN Common Stock Options Exercise +4,750 +2.7% 181,915 15 Feb 2026 Direct F1
transaction DAWN Common Stock Options Exercise +11,688 +6.4% 193,603 15 Feb 2026 Direct F1
transaction DAWN Common Stock Options Exercise +11,687 +6% 205,290 15 Feb 2026 Direct F1
transaction DAWN Common Stock Options Exercise +14,812 +7.2% 220,102 15 Feb 2026 Direct F1
transaction DAWN Common Stock Sale $179,338 -15,459 -7% $11.60 204,603 17 Feb 2026 Direct F2, F3
holding DAWN Common Stock 20,204 15 Feb 2026 See footnote F4
holding DAWN Common Stock 147,702 15 Feb 2026 See footnote F5
holding DAWN Common Stock 18,197 15 Feb 2026 See footnote F6
holding DAWN Common Stock 808,285 15 Feb 2026 See footnote F7
holding DAWN Common Stock 300,000 15 Feb 2026 See footnote F8
holding DAWN Common Stock 300,000 15 Feb 2026 See footnote F9

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction DAWN Restricted Stock Unit (RSU) Options Exercise $0 -4,750 -25% $0.000000 14,250 15 Feb 2026 Common Stock 4,750 Direct F1, F10, F11
transaction DAWN Restricted Stock Unit (RSU) Options Exercise $0 -11,688 -12% $0.000000 81,816 15 Feb 2026 Common Stock 11,688 Direct F1, F10, F11
transaction DAWN Restricted Stock Unit (RSU) Options Exercise $0 -11,687 -8.3% $0.000000 128,565 15 Feb 2026 Common Stock 11,687 Direct F1, F10, F11
transaction DAWN Restricted Stock Unit (RSU) Options Exercise $0 -14,812 -6.2% $0.000000 222,188 15 Feb 2026 Common Stock 14,812 Direct F1, F10, F11
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.
F2 The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.
F3 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.
F4 Represents shares held by The Jeremy Bender 2023 Grantor Retained Annuity Trust dated June 27, 2023.
F5 Represents shares held by The Melissa Bender 2022 Grantor Retained Annuity Trust under Irrevocable Trust Agreement dated March 29, 2022 of which the Reporting Person's spouse is trustee.
F6 Represents shares held by The Melissa Bender 2023 Grantor Retained Annuity Trust, dated June 27, 2023.
F7 Represents shares held by the Bender Revocable Trust dated January 18, 2017, as amended, Jeremy Bender and Melissa C. Bender, Trustees.
F8 Represents shares held by the Jeremy Bender 2025 Grantor Retained Annuity Trust of which the Reporting Person is trustee.
F9 Represents shares held by the Melissa Bender 2025 Grantor Retained Annuity Trust of which the Reporting Person's spouse is trustee.
F10 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.
F11 RSUs do not expire; they either vest or are canceled prior to the vesting date.