RadNet
RDNT • NASDAQ
RadNet is a medical - diagnostics & research company in the healthcare sector on NASDAQ, led by Cornelis 'Kees' Wesdorp. As of Q3 2025, 96% of shares are held by 318 institutional investors, with BlackRock, Inc. as the largest holder at 12.29%.
President and Chief Executive OfficerCornelis 'Kees' Wesdorp
Medical - Diagnostics & Research
Healthcare
Employees10.3K
Websiteradnet.com
Country
United States of America
Overview
Overview of institutional ownership in RDNT as of Q3 2025 with a market cap of $5.9B
All Institutions
- Institutions
- 318
- Value Held
- $5.6B
- Shares Held
- 74.0M
- Avg Position
- $17.7M
- Median Position
- $1.4M
Hedge Funds
- Hedge Funds
- 27
- Value Held
- $556.9M
- Shares Held
- 7.3M
- Avg Position
- $20.6M
- Median Position
- $3.0M
Ownership Breakdown
Based on market cap of $5.9B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in RDNT as of Q3 2025
| Institution | Position Value |
|---|---|
B BlackRock, Inc. Institution | $720.5M 0.01% of portfolio |
 VANGUARD GROUP INC Institution | $570.3M 0.01% of portfolio |
 BECK MACK & OLIVER LLC Long Only Manager | $249.7M 4.68% of portfolio |
 RTW INVESTMENTS, LLC Hedge Fund•Sector | $214.6M 2.66% of portfolio |
 STATE STREET CORP Institution | $193.4M 0.01% of portfolio |
 PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager | $157.8M 0.02% of portfolio |
 Allspring Global Investments Holdings, LLC Long Only Manager | $135.9M 0.22% of portfolio |
 GEODE CAPITAL MANAGEMENT LLC ETF Provider | $126.9M 0.01% of portfolio |
J JB CAPITAL PARTNERS LP Hedge Fund•Value | $108.5M 18.58% of portfolio |
 AMERIPRISE FINANCIAL INC Institution | $107.7M 0.02% of portfolio |
Net Capital Flow
Institutional buying and selling activity for RDNT in Q3 2025
- Traded
- +$343.4M
- Buyers
- 184
- Sellers
- 131
- Total Bought
- +$676.4M
- Total Sold
- −$333.1M
- Avg Position
- $15.8M
Biggest Buyers
| Institution | Net Bought |
|---|---|
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager | +$146.7M +1.9M shares |
 Polar Capital Holdings Plc Long Only Manager | +$63.4M +832.2K shares |
 Van Berkom & Associates Inc. Long Only Manager | +$62.3M +817.8K shares |
 FULLER & THALER ASSET MANAGEMENT, INC. Long Only Manager | +$53.8M +705.7K shares |
 WESTFIELD CAPITAL MANAGEMENT CO LP Long Only Manager | +$40.1M +525.8K shares |
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy | +$22.6M +296.4K shares |
 Marshall Wace LLP Institution | +$22.1M +290.2K shares |
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy | +$20.5M +269.3K shares |
 GOLDMAN SACHS GROUP INC Institution | +$16.4M +215.4K shares |
S SOROS FUND MANAGEMENT LLC Institution | +$13.6M +178.5K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
 Invesco Ltd. ETF Provider | −$28.0M −366.8K shares |
 HARBOR CAPITAL ADVISORS, INC. ETF Provider | −$23.2M −304.1K shares |
 Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy | −$21.4M −376.2K shares |
T T. Rowe Price Investment Management, Inc. Insurance Manager | −$20.4M −267.9K shares |
 Rockefeller Capital Management L.P. Long Only Manager | −$16.2M −213.2K shares |
8 8 KNOTS MANAGEMENT, LLC Hedge Fund•Long/Short | −$14.7M −257.5K shares |
A ADAGE CAPITAL PARTNERS GP LLC Institution | −$13.3M −173.9K shares |
 CITIGROUP INC Institution | −$12.6M −165.8K shares |
F First Turn Management, LLC Hedge Fund•Long/Short | −$11.3M −197.8K shares |
 Woodline Partners LP Hedge Fund•Long/Short | −$11.2M −197.3K shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited RDNT in Q3 2025
- New Positions
- 24
- New Value
- $179.0M
- Exited Positions
- 39
- Exited Value
- $99.2M
New Positions
| Institution | Position Value |
|---|---|
Polar Capital Holdings Plc Long Only Manager | $63.4M 832.2K shares |
FULLER & THALER ASSET MANAGEMENT, INC. Long Only Manager | $53.8M 705.7K shares |
WESTFIELD CAPITAL MANAGEMENT CO LP Long Only Manager | $40.1M 525.8K shares |
S SOROS FUND MANAGEMENT LLC Institution | $13.6M 178.5K shares |
D DARK FOREST CAPITAL MANAGEMENT LP Pension/Endowment | $3.2M 42.0K shares |
 EFG Asset Management Corp. Long Only Manager | $1.3M 17.1K shares |
 INTL FCSTONE INC. Institution | $1.0M 13.4K shares |
 Cetera Investment Advisers RIA/Wealth | $425.4K 5.6K shares |
 Quantinno Capital Management LP Hedge Fund•Market Neutral | $403.1K 5.3K shares |
Y Y.D. More Investments Ltd Institution | $350.6K 4.6K shares |
Exited Positions
| Institution | Previous Position |
|---|---|
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy | $21.4M 376.2K shares |
8 8 KNOTS MANAGEMENT, LLC Hedge Fund•Long/Short | $14.7M 257.5K shares |
F First Turn Management, LLC Hedge Fund•Long/Short | $11.3M 197.8K shares |
Woodline Partners LP Hedge Fund•Long/Short | $11.2M 197.3K shares |
K KINGDON CAPITAL MANAGEMENT, L.L.C. Hedge Fund•Long/Short | $9.8M 173.0K shares |
 CASTLEARK MANAGEMENT LLC Long Only Manager | $5.5M 96.2K shares |
 Nicholas Investment Partners, LP Long Only Manager | $4.7M 82.2K shares |
 Meteora Capital, LLC Hedge Fund•Event Driven | $3.3M 58.2K shares |
 ExodusPoint Capital Management, LP Hedge Fund•Multi-Strategy | $3.3M 57.8K shares |
S Sapience Investments, LLC Long Only Manager | $2.6M 46.2K shares |
Options Activity
Institutions with the largest Call and Put options positions in RDNT as of Q3 2025
- Call Positions
- 6
- Call Value
- $6.0M
- Put Positions
- 6
- Put Value
- $5.6M
Call Positions
| Institution | Position Value |
|---|---|
 SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $2.6M 340.0 contracts |
 CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $1.9M 247.0 contracts |
J JANE STREET GROUP, LLC Institution | $922.1K 121.0 contracts |
W WOLVERINE TRADING, LLC Institution | $590.1K 79.0 contracts |
 Walleye Trading LLC RIA/Wealth | - - contracts |
 Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | - - contracts |
Put Positions
| Institution | Position Value |
|---|---|
 MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy | $3.0M 400.0 contracts |
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $1.6M 212.0 contracts |
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $579.2K 76.0 contracts |
J JANE STREET GROUP, LLC Institution | $312.5K 41.0 contracts |
Walleye Trading LLC RIA/Wealth | - - contracts |
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy | - - contracts |
Most Committed Institutions
Institutions with RDNT as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
J JB CAPITAL PARTNERS LP Hedge Fund•Value | 18.58% $108.5M |
BECK MACK & OLIVER LLC Long Only Manager | 4.68% $249.7M |
 Falcon Edge Capital LP Hedge Fund•Multi-Strategy | 4.12% $40.6M |
 Global Alpha Capital Management Ltd. Long Only Manager | 3.06% $53.6M |
 PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. Long Only Manager | 2.90% $49.5M |
RTW INVESTMENTS, LLC Hedge Fund•Sector | 2.66% $214.6M |
R ROBOTTI ROBERT Institution | 2.42% $14.2M |
Van Berkom & Associates Inc. Long Only Manager | 1.78% $62.8M |
 Integral Health Asset Management, LLC Hedge Fund•Sector | 1.73% $22.9M |
 PENN CAPITAL MANAGEMENT CO INC Long Only Manager | 1.66% $21.6M |
Hedge Fund Spotlight
Discover hedge funds investing in RDNT
FORMULA GROWTH LTD
Hedge Fund • Long/Short
Portfolio ManagerRandall William Kelly
- Portfolio Value
- $288.3M
- Positions
- 123
- Last Reported
- Q3 2025
Sector Allocation
Position in RadNet
- Market Value
- $2.9M
- Shares Held
- 38.2K
- Portfolio Weight
- 1.01%
- Owned Since
- 2023-Q3
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Construction Industrials | $7.5M | 2.61% | |
Unknown Unknown | $7.2M | 2.51% | |
Unknown Unknown | $7.2M | 2.51% |
