Stock ownership · SEC 13F · Q2 2025

Y-MABS THERAPEUTICS INC

A breakdown of Y-MABS THERAPEUTICS INC's institutional base (CUSIP 984241109): the holders, the concentration among them, and what changed last quarter.

$96K
Reported value
2
Institutions
100%
Top-5 share

The verdict

$96K of Y-MABS THERAPEUTICS INC is reported by 2 institutions as of Q2 2025; ownership is held overwhelmingly by a small core of institutions.

2
institutions hold it
$96K
reported 13F value
100%
held by top 5

Based on long positions reported to the SEC as of Q2 2025; 13F omits shorts, options and non-US holdings.

How 13F ownership is computed · All tracked stocks · Concentration rankings

SEC Form 13F-HR ownership desk

CUSIP 984241109 · Q2 2025 $0M reported

VALUE-TRACE · HOLDERS-FOCUS · CONC-DOM · PHOTO-UNK · ACTIVITY-LIGHT · BOOK-MID

  • VALUE-TRACE $0.1M
  • HOLDERS-FOCUS 2 filers
  • CONC-DOM 100% top-5
  • PHOTO-UNK No peer
  • ACTIVITY-LIGHT 2 new
  • BOOK-MID 5Q history

Read with: Ownership concentration guide - Y-MABS THERAPEUTICS INC's top-five holders account for 100% of reported value — read concentration before treating any single filer as a signal.

Institutional ownership over time

The number of institutions reporting a Y-MABS THERAPEUTICS INC position has risen from 1 to 2 over the last 5 quarters of 13F filings.

0.511.522.5 Q1'24Q3'24Q4'24Q1'25Q2'25 2
Distinct 13F filers holding Y-MABS THERAPEUTICS INC, by quarter

Top Institutional Holders

# Institution Shares Value Share of reported
1 Squarepoint Ops LLC 12,233 $55K 57.4%
2 China Universal Asset Management Co., Ltd. 9,097 $41K 42.6%

Investment Discretion

SEC Form 13F requires each institutional filer to report whether it exercises sole or shared discretion over a position. Among Y-MABS THERAPEUTICS INC's reported holders for Q2 2025, by reported value:

Shared-defined discretion (DFND)
57.4%
Sole discretion (SOLE)
42.6%

Latest Quarter Activity · Q2 2025

New positions (2)

Squarepoint Ops LLC $55K
China Universal Asset Management Co., Ltd. $41K

Complete exits (2)

RHUMBLINE ADVISERS exited
STRS OHIO exited

Frequently Asked Questions

How many institutions hold Y-MABS THERAPEUTICS INC?▼
Y-MABS THERAPEUTICS INC is held by 2 institutional investors per the latest SEC Form 13F filings as of Q2 2025.
What is the total institutional value of Y-MABS THERAPEUTICS INC?▼
Institutions report $96K of Y-MABS THERAPEUTICS INC as of Q2 2025.
How concentrated is ownership of Y-MABS THERAPEUTICS INC?▼
The top five institutional holders account for 100% of the reported institutional value in Y-MABS THERAPEUTICS INC, making ownership held overwhelmingly by a small core of institutions.
Who is the largest institutional holder of Y-MABS THERAPEUTICS INC?▼
Squarepoint Ops LLC is the largest reported holder of Y-MABS THERAPEUTICS INC with $55K across 12,233 shares as of Q2 2025.

Source: U.S. Securities and Exchange Commission (SEC) - EDGAR Form 13F-HR institutional holdings filings · Q2 2025 13F-HR discloses long US-listed equity positions of managers with $100M+ qualifying assets, filed within 45 days of period end. Short positions and most derivatives are not disclosed.

PlainFundData is rendered directly from SEC EDGAR Form 13F-HR institutional holdings filings, no number is typed in by an editor. Holder lists, concentration, and reported value on this page are aggregated live from those 13F-HR extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-16.