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Day One Biopharmaceuticals Ownership | Who Owns Day One Biopharmaceuticals?

OverviewForecastRevenueFinancialsChartTranscripts

Day One Biopharmaceuticals Ownership Summary

Day One Biopharmaceuticals is owned by 80.68% institutional investors, 16.90% insiders, and 2.43% retail investors. Fmr is the largest institutional shareholder, holding 9.80% of DAWN shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.43% of its assets in Day One Biopharmaceuticals shares.

DAWN Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockDay One Biopharmaceuticals80.68%16.90%2.43%
SectorHealthcare Stocks 41.87%10.80%47.33%
IndustryBiotech Stocks 43.97%10.75%45.28%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Fmr10.10M9.80%$71.19M
Blackrock funding, inc. /de9.00M8.73%$63.46M
Atlas venture life science advisors6.43M6.24%$45.33M
Vanguard group6.18M6.00%$43.58M
Blackrock4.53M5.23%$62.47M
Deerfield management company, l.p. (series c)4.71M4.57%$33.17M
Pictet asset management sa3.72M3.61%$24.20M
Franklin resources3.48M3.37%$24.51M
Rubric capital management lp3.38M3.28%$23.81M
State street3.24M3.14%$22.85M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Atlas venture life science advisors6.43M6.02%$45.33M
Stonepine capital management647.38K3.71%$4.56M
Aigh capital management1.52M3.02%$10.72M
Dafna capital management999.16K1.74%$7.04M
Lion point capital, lp42.00K1.68%$296.10K
Mak capital one1.45M1.57%$10.21M
Boxer capital1.19M0.86%$16.40M
Vestal point capital, lp2.67M0.85%$18.86M
Perkins capital management82.25K0.51%$579.86K
Deerfield management company, l.p. (series c)4.71M0.51%$33.17M

Top Buyers

HolderShares% AssetsChange
Rubric capital management lp3.38M0.27%3.38M
Aigh capital management1.52M3.02%1.52M
Mak capital one1.45M1.57%1.45M
Deerfield management company, l.p. (series c)4.71M0.51%982.28K
State street3.24M0.00%550.76K

Top Sellers

HolderShares% AssetsChange
Ra capital management---5.76M
Estuary capital management lp---3.33M
Fairmount funds management---3.10M
Viking global investors lp---2.56M
Maverick capital---2.11M

New Positions

HolderShares% AssetsChangeValue
Rubric capital management lp3.38M0.27%3.38M$23.81M
Aigh capital management1.52M3.02%1.52M$10.72M
Mak capital one1.45M1.57%1.45M$10.21M
Jump financial272.55K0.02%272.55K$1.92M
Norges bank169.00K0.00%169.00K$2.14M

Sold Out

HolderChange
Nelson, van denburg & campbell wealth management group-12.00
Northwestern mutual wealth management-14.00
Geowealth management-23.00
C m bidwell & associates-28.00
Spire wealth management-40.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Sep 30, 2025167-1.76%83,154,2761.47%801.28%87-12.12%5410.20%
Jun 30, 2025178-6.32%86,133,5140.67%831.20%101-6.48%5210.64%
Mar 31, 202519311.56%94,051,9090.33%910.97%10813.68%4720.51%
Dec 31, 2024170-3.41%93,046,5121.26%961.06%93-8.82%408.11%
Sep 30, 20241746.10%91,763,45623.09%941.30%10227.50%37-22.92%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Vanguard US Total Market Shares ETF2.46M2.43%522.40K
Vanguard Total Stock Mkt Idx Inv2.39M2.33%-52.94K
Pictet-Biotech P USD2.25M2.19%27.52K
Polar Capital Biotech S Inc2.11M2.06%-
iShares Russell 2000 ETF1.70M1.66%-
Franklin Small Cap Growth SMA1.61M1.59%1.61M
Franklin US Small Cap Growth Equity1.61M1.59%130.60K
Fidelity Small Cap Growth1.59M1.55%-
Franklin Biotechnology Discv A(acc)USD1.55M1.52%-
Franklin Small Cap Growth Adv1.48M1.45%-

Recent Insider Transactions

DateNameRoleActivityValue
Nov 17, 2025Dubow Adam Gen Counsel & SecretarySell$38.50K
Nov 17, 2025York Charles N II COO and CFOSell$36.21K
Nov 17, 2025Merendino Lauren Chief Commercial OfficerSell$33.22K
Nov 17, 2025Bender Jeremy CHIEF EXECUTIVE OFFICERSell$141.69K
Aug 18, 2025York Charles N II COO and CFOSell$27.79K

Insider Transactions Trends

DateBuySell
2025 Q4-4
2025 Q3-4
2025 Q2-4
2025 Q1-3
2024 Q4-9

DAWN Ownership FAQ

Who Owns Day One Biopharmaceuticals?

Day One Biopharmaceuticals shareholders are primarily institutional investors at 80.68%, followed by 16.90% insiders and 2.42% retail investors. The average institutional ownership in Day One Biopharmaceuticals's industry, Biotech Stocks , is 43.97%, which Day One Biopharmaceuticals exceeds.

Who owns the most shares of Day One Biopharmaceuticals?

Day One Biopharmaceuticals’s largest shareholders are Fmr (10.1M shares, 9.80%), Blackrock funding, inc. /de (9M shares, 8.73%), and Atlas venture life science advisors (6.43M shares, 6.24%). Together, they hold 24.77% of Day One Biopharmaceuticals’s total shares outstanding.

Does Blackrock own Day One Biopharmaceuticals?

Yes, BlackRock owns 5.23% of Day One Biopharmaceuticals, totaling 4.53M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 62.47M$. In the last quarter, BlackRock decreased its holdings by -498K shares, a -9.90% change.

Who is Day One Biopharmaceuticals’s biggest shareholder by percentage of total assets invested?

Atlas venture life science advisors is Day One Biopharmaceuticals’s biggest shareholder by percentage of total assets invested, with 6.02% of its assets in 6.43M Day One Biopharmaceuticals shares, valued at 45.33M$.

Who is the top mutual fund holder of Day One Biopharmaceuticals shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Day One Biopharmaceuticals shares, with 2.43% of its total shares outstanding invested in 2.46M Day One Biopharmaceuticals shares.

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