Y-mAbs Therapeutics, Inc.
YMAB • NASDAQ
Y-mAbs Therapeutics, Inc. is a biotechnology company in the healthcare sector on NASDAQ, led by Michael Rossi, with a market cap of $391.2M. As of Q3 2025, 0% of shares are held by 2 institutional investors, with Skopos Labs, Inc. as the largest holder at -.
President and Chief Executive OfficerMichael Rossi
Market Cap$391.2M
Biotechnology
Healthcare
Employees100.0
Websiteymabs.com
Country
United States of America
Overview
Overview of institutional ownership in YMAB as of Q3 2025 with a market cap of $391.2M
All Institutions
- Institutions
- 2
- Value Held
- $78.3K
- Shares Held
- 16.4K
- Avg Position
- $39.2K
- Median Position
- $39.2K
Hedge Funds
- Hedge Funds
- 0
- Value Held
- -
- Shares Held
- -
- Avg Position
- -
- Median Position
- -
Ownership Breakdown
Based on market cap of $391.2M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in YMAB as of Q3 2025
| Institution | Position Value |
|---|---|
S Skopos Labs, Inc. RIA/Wealth | $75.5K 0.01% of portfolio |
 IFP Advisors, Inc RIA/Wealth | $2.9K 0.00% of portfolio |
 TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy | - 0.00% of portfolio |
 CWM, LLC RIA/Wealth | - 0.00% of portfolio |
 DEUTSCHE BANK AG\ Institution | - 0.00% of portfolio |
A ACORN CAPITAL ADVISORS, LLC Venture Capital | - 0.00% of portfolio |
G GF FUND MANAGEMENT CO. LTD. Institution | - 0.00% of portfolio |
 GSA CAPITAL PARTNERS LLP Hedge Fund•Quant | - 0.00% of portfolio |
 JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | - 0.00% of portfolio |
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager | - 0.00% of portfolio |
Net Capital Flow
Institutional buying and selling activity for YMAB in Q3 2025
- Traded
- −$125.8M
- Buyers
- 1
- Sellers
- 95
- Total Bought
- +$52.2K
- Total Sold
- −$125.8M
- Avg Position
- $816.1
Biggest Buyers
| Institution | Net Bought |
|---|---|
S Skopos Labs, Inc. RIA/Wealth | +$52.2K +11.1K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
 Paradigm Biocapital Advisors LP Hedge Fund•Long/Short | −$19.1M −4.2M shares |
A ACORN CAPITAL ADVISORS, LLC Venture Capital | −$15.4M −3.4M shares |
B BlackRock, Inc. Institution | −$12.4M −2.7M shares |
C Caligan Partners LP Hedge Fund•Activist | −$10.6M −2.3M shares |
S Sofinnova Ventures Inc Venture Capital | −$9.9M −2.2M shares |
 VANGUARD GROUP INC Institution | −$8.8M −1.9M shares |
 Polar Capital Holdings Plc Long Only Manager | −$8.1M −1.8M shares |
 GEODE CAPITAL MANAGEMENT LLC ETF Provider | −$3.8M −848.5K shares |
 STATE STREET CORP Institution | −$3.5M −780.1K shares |
 BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds | −$3.1M −693.7K shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited YMAB in Q3 2025
- New Positions
- 0
- New Value
- -
- Exited Positions
- 94
- Exited Value
- $125.8M
New Positions
| Institution | Position Value |
|---|---|
| No new positions found | |
Exited Positions
| Institution | Previous Position |
|---|---|
Paradigm Biocapital Advisors LP Hedge Fund•Long/Short | $19.1M 4.2M shares |
A ACORN CAPITAL ADVISORS, LLC Venture Capital | $15.4M 3.4M shares |
B BlackRock, Inc. Institution | $12.4M 2.7M shares |
C Caligan Partners LP Hedge Fund•Activist | $10.6M 2.3M shares |
S Sofinnova Ventures Inc Venture Capital | $9.9M 2.2M shares |
VANGUARD GROUP INC Institution | $8.8M 1.9M shares |
Polar Capital Holdings Plc Long Only Manager | $8.1M 1.8M shares |
GEODE CAPITAL MANAGEMENT LLC ETF Provider | $3.8M 848.5K shares |
STATE STREET CORP Institution | $3.5M 780.1K shares |
BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds | $3.1M 693.7K shares |
Options Activity
Institutions with the largest Call and Put options positions in YMAB as of Q3 2025
- Call Positions
- 1
- Call Value
- -
- Put Positions
- 0
- Put Value
- -
Call Positions
| Institution | Position Value |
|---|---|
 CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | - - contracts |
Put Positions
| Institution | Position Value |
|---|---|
| No put positions found | |
Most Committed Institutions
Institutions with YMAB as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
S Skopos Labs, Inc. RIA/Wealth | 0.01% $75.5K |
IFP Advisors, Inc RIA/Wealth | 0.00% $2.9K |
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy | 0.00% - |
CWM, LLC RIA/Wealth | 0.00% - |
DEUTSCHE BANK AG\ Institution | 0.00% - |
A ACORN CAPITAL ADVISORS, LLC Venture Capital | 0.00% - |
G GF FUND MANAGEMENT CO. LTD. Institution | 0.00% - |
GSA CAPITAL PARTNERS LLP Hedge Fund•Quant | 0.00% - |
JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | 0.00% - |
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager | 0.00% - |