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Y-mAbs Therapeutics Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of YMAB?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	783,112	1.72%
General Public	2,554,321	5.62%
Private Companies	4,559,233	10%
VC/PE Firms	6,094,097	13.4%
Hedge Funds	13,320,746	29.3%
Institutions	18,126,911	39.9%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 85.03% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
10%	Wg Biotech Aps	4,559,233	US$39.2m	0%	no data
9.32%	Paradigm Biocapital Advisors LP	4,236,346	US$36.4m	0%	1.23%
8.99%	Beryl Capital Management LLC	4,087,091	US$35.1m	0%	19.67%
7.26%	HBM Partners Ltd.	3,297,800	US$28.3m	0%	2.48%
6.15%	Acorn Bioventures	2,796,297	US$24.0m	-18.2%	12.19%
6.05%	BlackRock, Inc.	2,748,077	US$23.6m	-5.3%	no data
5.84%	Glazer Capital, LLC	2,654,700	US$22.8m	0%	1.62%
5.16%	Caligan Partners, LP	2,342,609	US$20.1m	0%	2.41%
4.83%	Sofinnova Investment, Inc.	2,194,278	US$18.8m	0%	1.15%
4.28%	The Vanguard Group, Inc.	1,943,285	US$16.7m	-0.17%	no data
3.94%	Polar Capital Holdings Plc	1,789,800	US$15.4m	-2.25%	0.05%
1.87%	Geode Capital Management, LLC	848,461	US$7.3m	-0.12%	no data
1.72%	State Street Global Advisors, Inc.	780,145	US$6.7m	-1.12%	no data
1.53%	Boothbay Fund Management, LLC	693,693	US$6.0m	0%	0.17%
1.14%	D. E. Shaw & Co., L.P.	516,857	US$4.4m	-5.97%	no data
0.91%	Dimensional Fund Advisors LP	412,246	US$3.5m	-1.51%	no data
0.82%	Thomas Gad	373,169	US$3.2m	38.1%	no data
0.77%	Nantahala Capital Management, LLC	351,878	US$3.0m	0%	0.17%
0.77%	Soleus Capital Management, L.P.	349,982	US$3.0m	0%	0.15%
0.68%	Northern Trust Global Investments	308,130	US$2.6m	-6.03%	no data
0.63%	Stonepine Capital Management LLC	285,300	US$2.5m	118%	1.09%
0.61%	Charles Schwab Investment Management, Inc.	278,179	US$2.4m	0.2%	no data
0.6%	Bank of America Corporation, Asset Management Arm	274,164	US$2.4m	-2.89%	no data
0.59%	Morgan Stanley, Investment Banking and Brokerage Investments	267,791	US$2.3m	-43.4%	no data
0.54%	AQR Capital Management, LLC	246,298	US$2.1m	51.2%	no data

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/09/15 04:20
End of Day Share Price	2025/09/15 00:00
Earnings	2025/06/30
Annual Earnings	2024/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Y-mAbs Therapeutics, Inc. is covered by 8 analysts. 10 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Peter Lawson	Barclays
Yun Zhong	Brean Capital Historical (Janney Montgomery)
Thomas Shrader	BTIG