Institutional shares held 3.29 Million
0 calls
0 puts
Total value of holdings $28.4M
$0 calls
$0 puts
Market Cap $376M
43,719,500 Shares Out.
Institutional ownership 7.54%
# of Institutions 8


Latest Institutional Activity in YMAB

Top Purchases

Q3 2025
Skopos Labs, Inc. Shares Held: 16.1K ($138K)
Q2 2025
Nantahala Capital Management, LLC Shares Held: 352K ($3.03M)
Q2 2025
Acorn Capital Advisors, LLC Shares Held: 3.42M ($29.4M)
Q2 2025
Gsa Capital Partners LLP Shares Held: 186K ($1.6M)
Q2 2025
Stonepine Capital Management, LLC Shares Held: 285K ($2.46M)

Top Sells

Q2 2025
Millennium Management LLC Shares Held: 140K ($1.21M)
Q2 2025
Morgan Stanley Shares Held: 293K ($2.52M)
Q2 2025
Squarepoint Ops LLC Shares Held: 12.2K ($105K)
Q2 2025
Jacobs Levy Equity Management, Inc Shares Held: 143K ($1.23M)
Q2 2025
Renaissance Technologies LLC Shares Held: 164K ($1.41M)

About YMAB

Y-mAbs Therapeutics, Inc., a commercial-stage biopharmaceutical company, focuses on the development and commercialization of novel antibody based therapeutic products for the treatment of cancer in the United States. It offers DANYELZA, a monoclonal antibody in combination with granulocyte-macrophage colony-stimulating factor for the treatment of pediatric patients with relapsed or refractory high-risk neuroblastoma. The company is also developing DANYELZA that is in Phase II clinical studies for the treatment of patients with first-line neuroblastoma, third-line neuroblastoma, and in relapsed osteosarcoma; GD2-GD3 vaccine that is in Phase II clinical trial for the treatment of Stage 4 high-risk neuroblastoma; and Omburtamab, a murine monoclonal antibody that is in clinical trials for the treatment of central nervous system/ leptomeningeal metastases from neuroblastoma, desmoplastic small round cell tumor, diffuse intrinsic pontine glioma, and other B7-H3 positive tumors. In addition, it is developing Nivatrotamab for the treatment of small cell lung cancer, as well as is in Phase I/II trial for the treatment of refractory GD2 positive adult and pediatric solid tumors; and Lu-omburtamab-DTPA that is in Phase I clinical development for the treatment of medulloblastoma and B7-H3 positive leptomeningeal metastases from solid tumors. The company has a license agreement with Memorial Sloan Kettering Cancer Center and Massachusetts Institute of Technology to develop and commercialize licensed products. Y-mAbs Therapeutics, Inc. was incorporated in 2015 and is headquartered in New York, New York.


Insider Transactions at YMAB

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
441K Shares
From 11 Insiders
Grant, award, or other acquisition 338K shares
Exercise of conversion of derivative security 103K shares
Sell / Disposition
12.2M Shares
From 20 Insiders
Sale (or disposition) back to the issuer 459K shares
Disposition due to a tender of shares in a change of control transaction 11.8M shares
Open market or private sale 14.7K shares

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