Vault-13

DAY ONE BIOPHARMACEUTICALS I

COM · Common Stock · CUSIP 23954D109 · ISIN US23954D1090

1 institutional holders -207 vs Q1 2026
165165 shares reported held*
$3.6kreported value*
0 new 0 added 1 reduced 199 sold out net sold ≈ $1.8bn (-82.7m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $21.53.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0100200300Q3 22: 93Q4 22: 110Q1 23: 127Q2 23: 141Q3 23: 132Q4 23: 142Q1 24: 150Q2 24: 159Q3 24: 168Q4 24: 166Q1 25: 186Q2 25: 176Q3 25: 173Q4 25: 184Q1 26: 208Q2 26: 11Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202293
Q4 2022110
Q1 2023127
Q2 2023141
Q3 2023132
Q4 2023142
Q1 2024150
Q2 2024159
Q3 2024168
Q4 2024166
Q1 2025186
Q2 2025176
Q3 2025173
Q4 2025184
Q1 2026208
Q2 20261

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q3 24: 97 bought or addedQ3 24: 58 cut or sold outQ4 24: 85 bought or addedQ4 24: 70 cut or sold outQ4 24Q1 25: 109 bought or addedQ1 25: 64 cut or sold outQ2 25: 97 bought or addedQ2 25: 89 cut or sold outQ2 25Q3 25: 87 bought or addedQ3 25: 91 cut or sold outQ4 25: 112 bought or addedQ4 25: 75 cut or sold outQ4 25Q1 26: 135 bought or addedQ1 26: 104 cut or sold outQ2 26: 0 bought or addedQ2 26: 200 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20249758
Q4 20248570
Q1 202510964
Q2 20259789
Q3 20258791
Q4 202511275
Q1 2026135104
Q2 20260200

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$20m$40m$60mQ3 25 calls: $640.8kQ3 25 puts: $431.8kQ3 25P/C 0.67Q4 25 calls: $7.4mQ4 25 puts: $6.7mQ4 25P/C 0.91Q1 26 calls: $37.8mQ1 26 puts: $47.4mQ1 26P/C 1.25Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$640.8k$431.8k0.67
Q4 2025$7.4m$6.7m0.91
Q1 2026$37.8m$47.4m1.25
Q2 2026$0$0—

Biggest buyers

None

Biggest sellers

BlackRock, Inc. Sold out -7,044,487-7.0m
GLAZER CAPITAL, LLC Sold out -4,683,687-4.7m
FIL Ltd Sold out -4,131,907-4.1m
Kryger Capital LLC Sold out -3,896,485-3.9m
DEERFIELD MANAGEMENT COMPANY, L.P. Sold out -3,723,131-3.7m
VANGUARD CAPITAL MANAGEMENT LLC Sold out -3,357,684-3.4m
JPMORGAN CHASE & CO Sold out -3,134,753-3.1m
STATE STREET CORP Sold out -2,869,876-2.9m
Balyasny Asset Management L.P. Sold out -2,625,235-2.6m
AQR Arbitrage LLC Sold out -2,462,154-2.5m

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
BlackRock, Inc. 13G · institution +1.1 pts · filed 2025-07-17 5.8% +1.1 pts 5.8m 2025-07-17
GLAZER CAPITAL, LLC 13G · passive investor new · filed 2026-03-19 5.4% new 5.6m 2026-03-19

Fell to 5% or below in the last year: Vestal Point Capital, LP (0.0%, 2026-05-15), Atlas Venture Fund XI, L.P. (0.0%, 2026-05-14), AI Day1 LLC (0.0%, 2026-04-27), FMR LLC (0.0%, 2026-04-07), VANGUARD GROUP INC (0.0%, 2026-03-26)

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 IFP Advisors, Inc 0.00% of their portfolio TAMPA, FL 165165 $3.6k $3.6k 0.00% Reduced -475 -475