Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Day One Biopharmaceuticals, Inc.

DAWN · — · CIK 0001845337 · Healthcare

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

14 Form 4 transaction lines observed in the same window
0 sales · 14 option, withholding, award, gift or other lines

Last qualifying purchase2023-10-20 · ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik Len · $1.1M

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenTenPercentOwner
○
VASCONCELLES MICHAELHead of Research and Dev.
○
Bender JeremyCHIEF EXECUTIVE OFFICER
○
York Charles N IICOO and CFO
○
Dubow AdamGen Counsel & Secretary
○
Holles Natalie C.Director
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2023-10-20 · ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik Len.

Recent Form 4 activity

0Purchases
9Sales
44Other Form 4 lines
19SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER14 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

The FINRA report lists no short interest for this ticker.

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2023-10-20ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock111,387USD 9.97USD 1,110,528SEC filing ↗
2023-10-19ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock384,400USD 10.06USD 3,867,064SEC filing ↗
2023-10-18ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock979,667USD 10.21USD 10,002,400SEC filing ↗
2023-06-09ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock769,230USD 13.00USD 9,999,990SEC filing ↗
2022-06-17Gladstone MichaelPurchase (P)Common Stock766,667USD 15.00USD 11,500,005SEC filing ↗
2022-06-17Atlas Venture Associates Opportunity I, L.P.; Atlas Venture Associates Opportunity I, LLC; Atlas Venture Associates XI, L.P.; Atlas Venture Associates XI, LLC; Atlas Venture Fund XI, L.P.; Atlas Venture Opportunity Fund I, L.P.; Atlas Venture Opportunity Fund II, L.P.Purchase (P)Common Stock766,667USD 15.00USD 11,500,005SEC filing ↗
2022-06-17ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock1,200,000USD 15.00USD 18,000,000SEC filing ↗
2022-01-20ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock4,615USD 14.73USD 67,979SEC filing ↗
2022-01-19ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock58,818USD 14.70USD 864,625SEC filing ↗
2022-01-18ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock43,429USD 14.26USD 619,298SEC filing ↗
2021-06-01ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day 1 LLC; Access Industries Holdings LLC; Blavatnik LenPurchase (P)Common Stock875,000USD 16.00USD 14,000,000SEC filing ↗
2021-06-01Grant Papanek JuliePurchase (P)Common Stock13,000USD 16.00USD 208,000SEC filing ↗
2021-06-01Canaan Partners XI LLC; Canaan XI L.P.Purchase (P)Common Stock13,000USD 16.00USD 208,000SEC filing ↗
2021-06-01Atlas Venture Associates Opportunity I, L.P.; Atlas Venture Associates Opportunity I, LLC; Atlas Venture Associates XI, L.P.; Atlas Venture Associates XI, LLC; Atlas Venture Fund XI, L.P.; Atlas Venture Opportunity Fund I, L.P.Purchase (P)Common Stock250,000USD 16.00USD 4,000,000SEC filing ↗
2021-06-01Josey John A.Purchase (P)Common Stock7,000USD 16.00USD 112,000SEC filing ↗

Form 4 evidence

53 transaction lines in the latest 365-day window; 384 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-04-23ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenU (U)Common Stock12,929,322USD 21.50USD 277,980,423SEC filing ↗
2026-04-23York Charles N IID (D)Common Stock312,025USD —USD —SEC filing ↗
2026-04-23VASCONCELLES MICHAELD (D)Common Stock4,397USD —USD —SEC filing ↗
Show recent Form 4 evidence (28 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-04-23ACCESS INDUSTRIES MANAGEMENT, LLC; AI Day1 LLC; Access Industries Holdings LLC; Blavatnik LenU (U)Common Stock12,929,322USD 21.50USD 277,980,423SEC filing ↗
2026-04-23York Charles N IID (D)Common Stock312,025USD —USD —SEC filing ↗
2026-04-23VASCONCELLES MICHAELD (D)Common Stock4,397USD —USD —SEC filing ↗
2026-04-23Ramasastry SairaD (D)Common Stock40,485USD —USD —SEC filing ↗
2026-04-23Merendino LaurenD (D)Common Stock60,157USD —USD —SEC filing ↗
2026-04-23Josey John A.D (D)Common Stock72,292USD —USD —SEC filing ↗
2026-04-23Holles Natalie C.D (D)Common Stock57,310USD —USD —SEC filing ↗
2026-04-23Dubow AdamD (D)Common Stock72,694USD —USD —SEC filing ↗
2026-04-23Bender JeremyD (D)Common Stock1,499,031USD —USD —SEC filing ↗
2026-02-17York Charles N IISale (S)Common Stock6,065USD 11.60USD 70,354SEC filing ↗
2026-02-17VASCONCELLES MICHAELSale (S)Common Stock2,728USD 11.60USD 31,645SEC filing ↗
2026-02-17Merendino LaurenSale (S)Common Stock5,814USD 11.60USD 67,442SEC filing ↗
2026-02-17Dubow AdamSale (S)Common Stock6,395USD 11.60USD 74,182SEC filing ↗
2026-02-17Bender JeremySale (S)Common Stock15,459USD 11.60USD 179,324SEC filing ↗
2026-02-15York Charles N IIOption exercise / conversion (M)Common Stock16,750USD —USD —SEC filing ↗
2026-02-15VASCONCELLES MICHAELOption exercise / conversion (M)Common Stock7,125USD —USD —SEC filing ↗
2026-02-15Merendino LaurenOption exercise / conversion (M)Common Stock15,162USD —USD —SEC filing ↗
2026-02-15Dubow AdamOption exercise / conversion (M)Common Stock16,463USD —USD —SEC filing ↗
2026-02-15Bender JeremyOption exercise / conversion (M)Common Stock42,937USD —USD —SEC filing ↗
2025-11-25Bender JeremyGift (G)Common Stock307,225USD 0.00USD 0SEC filing ↗
2025-11-17York Charles N IISale (S)Common Stock4,062USD 8.91USD 36,192SEC filing ↗
2025-11-17Merendino LaurenSale (S)Common Stock3,726USD 8.91USD 33,199SEC filing ↗
2025-11-17Dubow AdamSale (S)Common Stock4,319USD 8.91USD 38,482SEC filing ↗
2025-11-17Bender JeremySale (S)Common Stock15,894USD 8.91USD 141,616SEC filing ↗
2025-11-15York Charles N IIOption exercise / conversion (M)Common Stock10,250USD —USD —SEC filing ↗
2025-11-15Merendino LaurenOption exercise / conversion (M)Common Stock6,849USD —USD —SEC filing ↗
2025-11-15Dubow AdamOption exercise / conversion (M)Common Stock8,400USD —USD —SEC filing ↗
2025-11-15Bender JeremyOption exercise / conversion (M)Common Stock20,007USD —USD —SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerDAWN
CIK0001845337
SectorHealthcare
Industry— Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
Exchange—

Data coverage

Local Form 4 history384 transaction lines from 2021-06-01 to 2026-04-23
16 P purchase lines · 181 S sale lines · 187 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.