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AI Day1 LLC

Disclosed activity across 1 company

Tapewire entity
51181
SEC CIK
0001863302

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Reported relationships

Latest disclosed role at each company.

No relationships currently tracked through insider filings.

Disclosed balances

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Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

No balances currently tracked through insider filings.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

Day One Biopharmaceuticals, Inc.

Report date April 23, 2026 · Filed April 27, 2026

Jointly reported with Access Industries Holdings LLC, ACCESS INDUSTRIES MANAGEMENT, LLC, Blavatnik Len

Section 16 reporting ended · disclosed 2026-04-27. Current position is not established by this disclosure.

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect0 Reported balance After 2026-04-23 transaction · row 1 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes.
1 source row

Row 1 · 2026-04-23 · Other · Disposed 12,929,322 · Balance 0

F1: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F2: The securities reported are held directly by AI Day1 LLC ("AI Day1") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AI Day1. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Pre-Funded Warrant (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2026-04-23 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2026-04-23 · Disposition to issuer · Disposed 827,586 · Balance 0

F1: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F3: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

F2: The securities reported are held directly by AI Day1 LLC ("AI Day1") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AI Day1. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Filing footnotes · ownership attribution and instrument terms

F1: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F2: The securities reported are held directly by AI Day1 LLC ("AI Day1") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AI Day1. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

F3: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

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Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
April 23, 2026 Filed Apr 27, 2026 21:27 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 Disposition to issuerPre-Funded Warrant (right to buy) · Derivative 827,586 $21.50 Strike: $0.00 $17,793,016.24
Disclosure

SEC source: 0001193125-26-182440 · ownership.xml · derivative · entry 2

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 827,586 shares

Expires not disclosed

F1 · kind: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F1 · shares: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F3 · derivative.exercise_date: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

F3 · derivative.expiration_date: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC ("AI Day1") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AI Day1. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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April 23, 2026 Filed Apr 27, 2026 21:27 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 OtherCommon Stock 12,929,322 $21.50 $277,980,423.00
Disclosure

SEC source: 0001193125-26-182440 · ownership.xml · nonDerivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F1 · shares: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. ("Purchaser") to purchase all of the issued and outstanding shares of Common Stock for $21.50 per share in cash, upon the terms and subject to the conditions described in the Offer to Purchase and related Letter of Transmittal filed with the SEC on Schedule TO on March 26, 2026. Such shares were accepted by the Purchaser on April 23, 2026. On April 23, 2026, in connection with the consummation of the merger, each pre-funded warrant held by AI Day1 to purchase Common Stock was converted into the right to receive $21.4999 per warrant in cash.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC ("AI Day1") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AI Day1. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
August 01, 2024 Filed Aug 5, 2024 20:01 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseWarrant (right to buy) · Derivative 827,586 $14.50 Strike: $0.00 $11,999,914.24
Disclosure

SEC source: 0000950170-24-090703 · ownership.xml · derivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 827,586

Underlying: Common Stock · 827,586 shares

Expires not disclosed

F1 · derivative.exercise_date: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

F1 · derivative.expiration_date: Each pre-funded warrant is exercisable at any time after the date of issuance and the pre-funded warrants do not expire. The pre-funded warrants are not exercisable to the extent that the aggregate number of shares of Common Stock beneficially owned by AI Day1 LLC, including together with its direct or indirect affiliates, any person acting or who could be deemed to be acting as a group together with the holder, and any other persons whose beneficial ownership of the Common Stock would or could be aggregated with the holder's for the purposes of Section 13(d) or Section 16 of the Exchange Act of 1934, as amended, immediately following such exercise would exceed 9.99%; provided, however, that AI Day1 LLC may increase or decrease the beneficial ownership limitation by giving 61 days' notice to the Issuer, but not to exceed any percentage in excess of 19.99%.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
October 20, 2023 Filed Oct 20, 2023 20:02 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 111,387 $9.97 $1,110,907.11
Disclosure

SEC source: 0001209191-23-053235 · doc4.xml · nonDerivative · entry 3

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,929,322

F4 · price: The price reported in Column 4 is a weighted average purchase price of the shares of common stock. The shares of common stock were purchased in multiple transactions ranging from $9.83 to $10.13 inclusive. The reporting persons undertake to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of common stock purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
October 19, 2023 Filed Oct 20, 2023 20:02 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 384,400 $10.06 $3,867,371.52
Disclosure

SEC source: 0001209191-23-053235 · doc4.xml · nonDerivative · entry 2

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,817,935

F3 · price: The price reported in Column 4 is a weighted average purchase price of the shares of common stock. The shares of common stock were purchased in multiple transactions ranging from $9.88 to $10.20 inclusive. The reporting persons undertake to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of common stock purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
October 18, 2023 Filed Oct 20, 2023 20:02 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 979,667 $10.21 $10,000,048.87
Disclosure

SEC source: 0001209191-23-053235 · doc4.xml · nonDerivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,433,535

F1 · price: The price reported in Column 4 is a weighted average purchase price of the shares of common stock. The shares of common stock were purchased in multiple transactions ranging from $10.07 to $10.29 inclusive. The reporting persons undertake to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of common stock purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
June 09, 2023 Filed Jun 12, 2023 20:03 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 769,230 $13.00 $9,999,990.00
Disclosure

SEC source: 0001209191-23-036242 · doc4.xml · nonDerivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,453,868

F1 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
June 17, 2022 Filed Jun 21, 2022 20:37 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 1,200,000 $15.00 $18,000,000.00
Disclosure

SEC source: 0001209191-22-038431 · doc4.xml · nonDerivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,684,638

F1 · shares: Represents securities purchased in the Issuer's public offering.

F2 · ownership.direct: The securities reported are held directly by AI Day1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and controls a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
January 20, 2022 Filed Jan 20, 2022 23:37 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 4,615 $14.73 $67,975.72
Disclosure

SEC source: 0001209191-22-004174 · doc4.xml · nonDerivative · entry 3

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,484,638

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.60 to $14.75, inclusive. The reporting person undertakes to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., 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 ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
January 19, 2022 Filed Jan 20, 2022 23:37 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 58,818 $14.70 $864,565.78
Disclosure

SEC source: 0001209191-22-004174 · doc4.xml · nonDerivative · entry 2

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,480,023

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.16 to $14.75, inclusive. The reporting person undertakes to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., 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 ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

Read SEC document
January 18, 2022 Filed Jan 20, 2022 23:37 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 43,429 $14.26 $619,367.03
Disclosure

SEC source: 0001209191-22-004174 · doc4.xml · nonDerivative · entry 1

AI Day1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,421,205

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.05 to $14.53, inclusive. The reporting person undertakes to provide to Day One Biopharmaceuticals, Inc., any security holder of Day One Biopharmaceuticals, Inc., 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 ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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June 01, 2021 Filed Jun 3, 2021 20:42 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 ConversionSeries B Redeemable Convertible Preferred Stock · Derivative 741,396 $0.00 $0.00
Disclosure

SEC source: 0001209191-21-037697 · doc4.xml · derivative · entry 4

AI Day 1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 741,396 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Series B Redeemable Convertible Preferred Stock automatically converted into one share of common stock of the Issuer immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F2 · derivative.exercise_date: Each share of Series B Redeemable Convertible Preferred Stock automatically converted into one share of common stock of the Issuer immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F2 · derivative.expiration_date: Each share of Series B Redeemable Convertible Preferred Stock automatically converted into one share of common stock of the Issuer immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F3 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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June 01, 2021 Filed Jun 3, 2021 20:42 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 ConversionSeries A Redeemable Convertible Preferred Stock · Derivative 7,761,380 $0.00 $0.00
Disclosure

SEC source: 0001209191-21-037697 · doc4.xml · derivative · entry 3

AI Day 1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,761,380 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Series A Redeemable Convertible Preferred Stock automatically converted into one share of common stock of Day One Biopharmaceuticals, Inc. (the "Issuer") immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F1 · derivative.exercise_date: Each share of Series A Redeemable Convertible Preferred Stock automatically converted into one share of common stock of Day One Biopharmaceuticals, Inc. (the "Issuer") immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F1 · derivative.expiration_date: Each share of Series A Redeemable Convertible Preferred Stock automatically converted into one share of common stock of Day One Biopharmaceuticals, Inc. (the "Issuer") immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F3 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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June 01, 2021 Filed Jun 3, 2021 20:42 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 PurchaseCommon Stock 875,000 $16.00 $14,000,000.00
Disclosure

SEC source: 0001209191-21-037697 · doc4.xml · nonDerivative · entry 2

AI Day 1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,377,776

F4 · kind: Represents securities purchased in the Issuer's initial public offering.

F3 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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June 01, 2021 Filed Jun 3, 2021 20:42 UTC Day One Biopharmaceuticals, Inc. DAWN · Entity 51180 ConversionCommon Stock 8,502,776 Not disclosed Not disclosed
Disclosure

SEC source: 0001209191-21-037697 · doc4.xml · nonDerivative · entry 1

AI Day 1 LLC · CIK 0001863302 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · Affiliate of 10% Owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · Affiliate of 10% Owner

Blavatnik Len · CIK 0001326628 · Affiliate of 10% Owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,502,776

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Series A Redeemable Convertible Preferred Stock automatically converted into one share of common stock of Day One Biopharmaceuticals, Inc. (the "Issuer") immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F2 · price: Each share of Series B Redeemable Convertible Preferred Stock automatically converted into one share of common stock of the Issuer immediately prior to the completion of the Issuer's initial public offering and had no expiration date.

F3 · ownership.direct: The securities reported are held directly by AI Day 1 LLC and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because AIH indirectly controls all of the outstanding voting interests in AI Day 1 LLC, AIM controls AIH and Mr. Blavatnik controls AIM and holds a majority of the outstanding voting interests in AIH. AIH, AIM and Mr. Blavatnik each disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.