United States Biotechnology & Medical Research

Day One Biopharmaceuticals Inc (DAWN)

Track

The most recent insider trading activity occurred on February 17, 2026, with multiple officers and executives engaging in proposed sales and actual sales. Notably, the Chief Executive Officer, Jeremy Bender, and other key personnel like the COO and CFO, Charles York, and Chief Commercial Officer, Lauren Merendino, were involved in significant sell transactions.
Ticker: DAWN Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Top insiders
Trades
Merendino Lauren
Chief Commercial Officer
1 sale — total 67,448 USD
Sale 17 Feb 2026
Value US$4,892,833.69 | Price 100.07 | Shares 66,784
Sale 17 Feb 2026
Value US$2,436,340.19 | Price 226.08 | Shares 55,484
Sale 17 Feb 2026
Value US$70,359.46 | Price 11.60 | Shares 6,065
Sale 17 Feb 2026
Value US$179,338.31 | Price 11.60 | Shares 15,459
Sale 17 Feb 2026
Value US$31,647.26 | Price 11.60 | Shares 2,728
Proposed sale 17 Feb 2026
Value US$179,338.31 | Price 11.60 | Shares 15,459
Proposed sale 17 Feb 2026
Value US$70,359.46 | Price 11.60 | Shares 6,065
Proposed sale 17 Feb 2026
Value US$67,447.63 | Price 11.60 | Shares 5,814
Proposed sale 17 Feb 2026
Value US$74,187.76 | Price 11.60 | Shares 6,395
Sale 17 Nov 2025
Value US$33,216.17 | Price 8.91 | Shares 3,726
Sale 17 Nov 2025
Value US$36,211.51 | Price 8.91 | Shares 4,062
Sale 17 Nov 2025
Value US$38,502.59 | Price 8.91 | Shares 4,319
Sale 17 Nov 2025
Value US$141,690.24 | Price 8.91 | Shares 15,894
Proposed sale 17 Nov 2025
Value US$36,211.11 | Price 8.91 | Shares 4,062
Proposed sale 17 Nov 2025
Value US$33,215.80 | Price 8.91 | Shares 3,726
Proposed sale 17 Nov 2025
Value US$38,502.16 | Price 8.91 | Shares 4,319
Proposed sale 17 Nov 2025
Value US$141,688.65 | Price 8.91 | Shares 15,894
Sale 18 Aug 2025
Value US$27,785.71 | Price 6.77 | Shares 4,106
Sale 18 Aug 2025
Value US$29,538.39 | Price 6.77 | Shares 4,365
Sale 18 Aug 2025
Value US$108,666.09 | Price 6.77 | Shares 16,058
Sale 18 Aug 2025
Value US$25,484.90 | Price 6.77 | Shares 3,766
Proposed sale 18 Aug 2025
Value US$108,666.09 | Price 6.77 | Shares 16,058
Sale 16 May 2025
Value US$24,574.77 | Price 6.26 | Shares 3,927
Sale 16 May 2025
Value US$28,485.96 | Price 6.26 | Shares 4,552
Sale 16 May 2025
Value US$26,796.33 | Price 6.26 | Shares 4,282
Sale 16 May 2025
Value US$87,385.32 | Price 6.26 | Shares 13,964
Proposed sale 16 May 2025
Value US$26,796.33 | Price 6.26 | Shares 4,282
Proposed sale 16 May 2025
Value US$24,574.77 | Price 6.26 | Shares 3,927
Proposed sale 16 May 2025
Value US$28,485.96 | Price 6.26 | Shares 4,552
Proposed sale 16 May 2025
Value US$87,385.32 | Price 6.26 | Shares 13,964
Sale 18 Feb 2025
Value US$52,278.31 | Price 11.96 | Shares 4,370
Sale 18 Feb 2025
Value US$144,130.22 | Price 11.96 | Shares 12,048
Sale 18 Feb 2025
Value US$55,580.10 | Price 11.96 | Shares 4,646
Proposed sale 18 Feb 2025
Value US$55,579.63 | Price 11.96 | Shares 4,646
Proposed sale 18 Feb 2025
Value US$52,277.87 | Price 11.96 | Shares 4,370
Proposed sale 18 Feb 2025
Value US$144,129.02 | Price 11.96 | Shares 12,048
Planned sale 10 Dec 2024
Value US$399,339.00 | Price 13.31 | Shares 30,000
Sale 18 Nov 2024
Value US$139,420.45 | Price 13.21 | Shares 10,554
Sale 18 Nov 2024
Value US$29,141.70 | Price 13.21 | Shares 2,206
Sale 18 Nov 2024
Value US$34,372.94 | Price 13.21 | Shares 2,602
Sale 18 Nov 2024
Value US$41,810.28 | Price 13.21 | Shares 3,165
Proposed sale 18 Nov 2024
Value US$29,141.70 | Price 13.21 | Shares 2,206
Proposed sale 18 Nov 2024
Value US$139,420.45 | Price 13.21 | Shares 10,554
Proposed sale 11 Nov 2024
Value US$819,500.00 | Price 16.39 | Shares 50,000
Planned sale 11 Nov 2024
Value US$160,994.00 | Price 16.10 | Shares 10,000
Planned sale 8 Nov 2024
Value US$295,228.99 | Price 16.17 | Shares 18,255
Planned sale 7 Nov 2024
Value US$180,286.59 | Price 16.03 | Shares 11,245
Planned sale 31 Oct 2024
Value US$8,010.00 | Price 16.02 | Shares 500
Proposed sale 31 Oct 2024
Value US$434,100.00 | Price 14.47 | Shares 30,000
Planned sale 10 Sep 2024
Value US$426,675.00 | Price 14.22 | Shares 30,000
Sale 16 Aug 2024
Value US$36,859.63 | Price 14.00 | Shares 2,633
Sale 16 Aug 2024
Value US$31,245.99 | Price 14.00 | Shares 2,232
Sale 16 Aug 2024
Value US$149,524.39 | Price 14.00 | Shares 10,681
Sale 16 Aug 2024
Value US$44,825.12 | Price 14.00 | Shares 3,202
Proposed sale 16 Aug 2024
Value US$149,524.39 | Price 14.00 | Shares 10,681
Proposed sale 16 Aug 2024
Value US$31,245.99 | Price 14.00 | Shares 2,232
Planned sale 16 Jul 2024
Value US$320,226.00 | Price 16.01 | Shares 20,000
Proposed sale 16 Jul 2024
Value US$1,256,000.00 | Price 15.70 | Shares 80,000
Proposed sale 21 Jun 2024
Value US$131,877.00 | Price 13.19 | Shares 10,000
Sale 21 Jun 2024
Value US$131,877.00 | Price 13.19 | Shares 10,000
Planned sale 10 Jun 2024
Value US$378,588.00 | Price 12.62 | Shares 30,000
Proposed sale 10 Jun 2024
Value US$383,100.00 | Price 12.77 | Shares 30,000
Sale 16 May 2024
Value US$36,450.41 | Price 16.08 | Shares 2,267
Sale 16 May 2024
Value US$43,010.52 | Price 16.08 | Shares 2,675
Sale 16 May 2024
Value US$126,587.61 | Price 16.08 | Shares 7,873
Sale 16 May 2024
Value US$52,304.01 | Price 16.08 | Shares 3,253
Proposed sale 16 May 2024
Value US$52,303.69 | Price 16.08 | Shares 3,253
Proposed sale 16 May 2024
Value US$126,586.82 | Price 16.08 | Shares 7,873
Proposed sale 16 May 2024
Value US$43,010.26 | Price 16.08 | Shares 2,675
Proposed sale 16 May 2024
Value US$36,450.19 | Price 16.08 | Shares 2,267
Planned sale 10 May 2024
Value US$163,743.00 | Price 16.37 | Shares 10,000
Planned sale 3 May 2024
Value US$163,417.21 | Price 17.85 | Shares 9,154
Planned sale 3 May 2024
Value US$144,214.11 | Price 17.85 | Shares 8,078
Planned sale 2 May 2024
Value US$107.62 | Price 17.94 | Shares 6
Planned sale 2 May 2024
Value US$3,579.10 | Price 17.90 | Shares 200
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-02-18 2026-02-17 S Sale
1.6
Merendino Lauren

Chief Commercial Officer

Officer
66,784 -40.0%
100.07
US$4,892,834 		66,784 -40.0% 100.07 US$4,892,834
2026-02-18 2026-02-17 S Sale
3.0
Dubow Adam

Gen Counsel & Secretary

Officer
55,484 +11.5%
226.08
US$2,436,340 		55,484 +11.5% 226.08 US$2,436,340
2026-02-18 2026-02-17 S Sale
3.2
York Charles N II

COO and CFO

Officer
84,813 -43.6%
116.55
US$2,007,958 		84,813 -43.6% 116.55 US$2,007,958
2026-02-18 2026-02-17 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
15,459 -7.0%
11.60
US$179,338 		15,459 -7.0% 11.60 US$179,338
2026-02-18 2026-02-17 S Sale
VASCONCELLES MICHAEL

Head of Research and Dev.

Officer
2,728 -38.3%
11.60
US$31,647 		2,728 -38.3% 11.60 US$31,647
2026-02-17 2026-02-17 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
15,459
11.60
US$179,338 		15,459 11.60 US$179,338
2026-02-17 2026-02-17 PrS Proposed sale
3.2
CHARLES YORK

Officer

Officer
6,065
11.60
US$70,359 		6,065 11.60 US$70,359
2026-02-17 2026-02-17 PrS Proposed sale
1.6
LAUREN MERENDINO

Officer

Officer
5,814
11.60
US$67,448 		5,814 11.60 US$67,448
2026-02-17 2026-02-17 PrS Proposed sale
3.0
ADAM DUBOW

Officer

Officer
6,395
11.60
US$74,188 		6,395 11.60 US$74,188
2025-11-18 2025-11-17 S Sale
1.6
Merendino Lauren

Chief Commercial Officer

Officer
3,726 -6.8%
8.91
US$33,216 		3,726 -6.8% 8.91 US$33,216
2025-11-18 2025-11-17 S Sale
3.2
York Charles N II

COO and CFO

Officer
4,062 -1.4%
8.91
US$36,212 		4,062 -1.4% 8.91 US$36,212
2025-11-18 2025-11-17 S Sale
3.0
Dubow Adam

Gen Counsel & Secretary

Officer
4,319 -6.5%
8.91
US$38,503 		4,319 -6.5% 8.91 US$38,503
2025-11-18 2025-11-17 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
15,894 -8.2%
8.91
US$141,690 		15,894 -8.2% 8.91 US$141,690
2025-11-17 2025-11-17 PrS Proposed sale
3.2
CHARLES YORK

Officer

Officer
4,062
8.91
US$36,211 		4,062 8.91 US$36,211
2025-11-17 2025-11-17 PrS Proposed sale
1.6
LAUREN MERENDINO

Officer

Officer
3,726
8.91
US$33,216 		3,726 8.91 US$33,216
2025-11-17 2025-11-17 PrS Proposed sale
3.0
ADAM DUBOW

Officer

Officer
4,319
8.91
US$38,502 		4,319 8.91 US$38,502
2025-11-17 2025-11-17 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
15,894
8.91
US$141,689 		15,894 8.91 US$141,689
2025-08-19 2025-08-18 S Sale
3.2
York Charles N II

COO and CFO

Officer
4,106 -1.5%
6.77
US$27,786 		4,106 -1.5% 6.77 US$27,786
2025-08-19 2025-08-18 S Sale
3.0
Dubow Adam

Gen Counsel & Secretary

Officer
4,365 -7.4%
6.77
US$29,538 		4,365 -7.4% 6.77 US$29,538
2025-08-19 2025-08-18 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
16,058 -9.1%
6.77
US$108,666 		16,058 -9.1% 6.77 US$108,666
2025-08-19 2025-08-18 S Sale
1.6
Merendino Lauren

Chief Commercial Officer

Officer
3,766 -8.2%
6.77
US$25,485 		3,766 -8.2% 6.77 US$25,485
2025-08-18 2025-08-18 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
16,058
6.77
US$108,666 		16,058 6.77 US$108,666
2025-05-19 2025-05-16 S Sale
1.6
Merendino Lauren

Chief Commercial Officer

Officer
3,927 -10.0%
6.26
US$24,575 		3,927 -10.0% 6.26 US$24,575
2025-05-19 2025-05-16 S Sale
3.0
Dubow Adam

GENERAL COUNSEL

Officer
4,552 -8.8%
6.26
US$28,486 		4,552 -8.8% 6.26 US$28,486
2025-05-19 2025-05-16 S Sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
4,282 -1.6%
6.26
US$26,796 		4,282 -1.6% 6.26 US$26,796
2025-05-19 2025-05-16 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
13,964 -8.7%
6.26
US$87,385 		13,964 -8.7% 6.26 US$87,385
2025-05-16 2025-05-16 PrS Proposed sale
3.2
CHARLES YORK

Officer

Officer
4,282
6.26
US$26,796 		4,282 6.26 US$26,796
2025-05-16 2025-05-16 PrS Proposed sale
1.6
LAUREN MERENDINO

Officer

Officer
3,927
6.26
US$24,575 		3,927 6.26 US$24,575
2025-05-16 2025-05-16 PrS Proposed sale
3.0
ADAM DUBOW

Officer

Officer
4,552
6.26
US$28,486 		4,552 6.26 US$28,486
2025-05-16 2025-05-16 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
13,964
6.26
US$87,385 		13,964 6.26 US$87,385
2025-02-21 2025-02-18 S Sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
4,370 -1.7%
11.96
US$52,278 		4,370 -1.7% 11.96 US$52,278
2025-02-21 2025-02-18 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
12,048 -8.6%
11.96
US$144,130 		12,048 -8.6% 11.96 US$144,130
2025-02-21 2025-02-18 S Sale
3.0
Dubow Adam

GENERAL COUNSEL

Officer
4,646 -10.5%
11.96
US$55,580 		4,646 -10.5% 11.96 US$55,580
2025-02-18 2025-02-18 PrS Proposed sale
3.0
ADAM DUBOW

Officer

Officer
4,646
11.96
US$55,580 		4,646 11.96 US$55,580
2025-02-18 2025-02-18 PrS Proposed sale
3.2
CHARLES YORK

Officer

Officer
4,370
11.96
US$52,278 		4,370 11.96 US$52,278
2025-02-18 2025-02-18 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
12,048
11.96
US$144,129 		12,048 11.96 US$144,129
2024-12-12 2024-12-10 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
30,000 -2.8%
13.31
US$399,339 		30,000 -2.8% 13.31 US$399,339
2024-11-19 2024-11-18 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
10,554 -8.9%
13.21
US$139,420 		10,554 -8.9% 13.21 US$139,420
2024-11-19 2024-11-18 S Sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
2,206 -0.2%
13.21
US$29,142 		2,206 -0.2% 13.21 US$29,142
2024-11-19 2024-11-18 S Sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
2,602 -1.1%
13.21
US$34,373 		2,602 -1.1% 13.21 US$34,373
2024-11-19 2024-11-18 S Sale
3.0
Dubow Adam

GENERAL COUNSEL

Officer
3,165 -9.0%
13.21
US$41,810 		3,165 -9.0% 13.21 US$41,810
2024-11-18 2024-11-18 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
2,206
13.21
US$29,142 		2,206 13.21 US$29,142
2024-11-18 2024-11-18 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
10,554
13.21
US$139,420 		10,554 13.21 US$139,420
2024-11-12 2024-11-11 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
50,000
16.39
US$819,500 		50,000 16.39 US$819,500
2024-11-12 2024-11-11 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
10,000 -0.9%
16.10
US$160,994 		10,000 -0.9% 16.10 US$160,994
2024-11-12 2024-11-08 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
18,255 -1.7%
16.17
US$295,229 		18,255 -1.7% 16.17 US$295,229
2024-11-08 2024-11-07 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
11,245 -1.0%
16.03
US$180,287 		11,245 -1.0% 16.03 US$180,287
2024-11-04 2024-10-31 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
500 -0.0%
16.02
US$8,010 		500 -0.0% 16.02 US$8,010
2024-10-31 2024-10-31 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
30,000
14.47
US$434,100 		30,000 14.47 US$434,100
2024-09-12 2024-09-10 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
30,000 -2.7%
14.22
US$426,675 		30,000 -2.7% 14.22 US$426,675
2024-08-19 2024-08-16 S Sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
2,633 -1.1%
14.00
US$36,860 		2,633 -1.1% 14.00 US$36,860
2024-08-19 2024-08-16 S Sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
2,232 -0.2%
14.00
US$31,246 		2,232 -0.2% 14.00 US$31,246
2024-08-19 2024-08-16 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
10,681 -9.7%
14.00
US$149,524 		10,681 -9.7% 14.00 US$149,524
2024-08-19 2024-08-16 S Sale
3.0
Dubow Adam

GENERAL COUNSEL

Officer
3,202 -10.6%
14.00
US$44,825 		3,202 -10.6% 14.00 US$44,825
2024-08-16 2024-08-16 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
10,681
14.00
US$149,524 		10,681 14.00 US$149,524
2024-08-16 2024-08-16 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
2,232
14.00
US$31,246 		2,232 14.00 US$31,246
2024-07-17 2024-07-16 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
20,000 -1.8%
16.01
US$320,226 		20,000 -1.8% 16.01 US$320,226
2024-07-16 2024-07-16 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
80,000
15.70
US$1,256,000 		80,000 15.70 US$1,256,000
2024-06-21 2024-06-21 PrS Proposed sale
1.8
SAIRA RAMASASTRY

Director

Non-Executive Director
10,000
13.19
US$131,877 		10,000 13.19 US$131,877
2024-06-21 2024-06-21 S Sale
1.8
Ramasastry Saira
Non-Executive Director
10,000 -19.8%
13.19
US$131,877 		10,000 -19.8% 13.19 US$131,877
2024-06-12 2024-06-10 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
30,000 -2.6%
12.62
US$378,588 		30,000 -2.6% 12.62 US$378,588
2024-06-10 2024-06-10 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
30,000
12.77
US$383,100 		30,000 12.77 US$383,100
2024-05-17 2024-05-16 S Sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
2,267 -0.2%
16.08
US$36,450 		2,267 -0.2% 16.08 US$36,450
2024-05-17 2024-05-16 S Sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
2,675 -1.2%
16.08
US$43,011 		2,675 -1.2% 16.08 US$43,011
2024-05-17 2024-05-16 S Sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
7,873 -1.2%
16.08
US$126,588 		7,873 -1.2% 16.08 US$126,588
2024-05-17 2024-05-16 S Sale
3.0
Dubow Adam

GENERAL COUNSEL

Officer
3,253 -13.0%
16.08
US$52,304 		3,253 -13.0% 16.08 US$52,304
2024-05-16 2024-05-16 PrS Proposed sale
3.0
ADAM DUBOW

Officer

Officer
3,253
16.08
US$52,304 		3,253 16.08 US$52,304
2024-05-16 2024-05-16 PrS Proposed sale
3.2
JEREMY BENDER

Officer; Director

Executive Director
7,873
16.08
US$126,587 		7,873 16.08 US$126,587
2024-05-16 2024-05-16 PrS Proposed sale
3.2
CHARLES YORK

Officer

Officer
2,675
16.08
US$43,010 		2,675 16.08 US$43,010
2024-05-16 2024-05-16 PrS Proposed sale
3.8
SAMUEL BLACKMAN

Officer

Officer
2,267
16.08
US$36,450 		2,267 16.08 US$36,450
2024-05-14 2024-05-10 PlS Planned sale
3.8
Blackman Samuel C.

HEAD OF R&D

Officer
10,000 -0.9%
16.37
US$163,743 		10,000 -0.9% 16.37 US$163,743
2024-05-03 2024-05-03 PlS Planned sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
9,154 -1.4%
17.85
US$163,417 		9,154 -1.4% 17.85 US$163,417
2024-05-03 2024-05-03 PlS Planned sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
8,078 -3.6%
17.85
US$144,214 		8,078 -3.6% 17.85 US$144,214
2024-05-03 2024-05-02 PlS Planned sale
3.2
Bender Jeremy

CHIEF EXECUTIVE OFFICER

Executive Director
6 -0.0%
17.94
US$108 		6 -0.0% 17.94 US$108
2024-05-03 2024-05-02 PlS Planned sale
3.2
York Charles N II

COO, CFO AND SECRETARY

Officer
200 -0.1%
17.90
US$3,579 		200 -0.1% 17.90 US$3,579
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