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Day One Biopharmaceuticals

173 hedge funds and large institutions have $560M invested in Day One Biopharmaceuticals in 2025 Q2 according to their latest regulatory filings, with 26 funds opening new positions, 71 increasing their positions, 55 reducing their positions, and 34 closing their positions.

New
Increased
Maintained
Reduced
Closed

more call options, than puts

Call options by funds: $ | Put options by funds: $

more repeat investments, than reductions

Existing positions increased: | Existing positions reduced:

less funds holding

Funds holding:

less ownership

Funds ownership:

24% less first-time investments, than exits

New positions opened: 26 | Existing positions closed: 34

25% less capital invested

Capital invested by funds: $746M → $560M (-$186M)

50% less funds holding in top 10

Funds holding in top 10: 21 (-1)

Holders
173
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
1
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$902K
Puts
$581K
Net Calls
Net Calls Change

Top Buyers

1 +$21.1M
2 +$5.24M
3 +$4.56M
4
Renaissance Technologies
Renaissance Technologies
New York
+$4.49M
5
Morgan Stanley
Morgan Stanley
New York
+$4.43M
Name Holding Trade Value Shares
Change
Change in
Stake
76
$441K
77
$432K
78
$413K
79
$394K
80
$376K
81
$370K
82
$370K
83
$365K
84
$356K
85
$331K
86
$325K
87
$295K
88
$289K
89
$287K
90
$248K
91
$237K
92
$228K
93
$226K
94
$219K
95
$214K
96
$214K
97
$183K
98
$182K
99
$182K
100
$178K