SCHEDULE 13D/A Filed 2026-04-13 Event 2026-04-09 Intent: M&A-ARB SEC 0001193125-26-153054 →

AI Day1 LLC → Day One Biopharmaceuticals, Inc. DAWN

Stake: 12.52% Shares: 12,929,322 CUSIP: 23954D109 Class: Common Stock, par value $0.0001 per share

AI Analyst Brief conf: high

AI Day1 LLC has tendered its entire 12.9M share (12.52%) stake into Servier's $21.50/share cash tender offer for DAWN, filed March 26 — this is a major insider/strategic holder validating the deal by tendering, reducing overhang risk and signaling high deal-close confidence.

Item 4 — Purpose of Transaction

The disclosure in Item 4 is hereby supplemented by adding the following at the end thereof: On April 9, 2026, AI Day1 tendered all of its shares of Common Stock pursuant to the tender offer by Servier Detroit Inc. 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.

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

1 13D/G filings on this issuer

0 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-03-31

DTC 2.22

7,236,832 shares short · -10.6% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $1.46M

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