Who owns RadNet (RDNT)
Which tracked institutional funds hold RDNT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RDNT company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
105 tracked funds added or opened RDNT while 59 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
RDNT’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes RDNT more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in RDNT divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 305 tracked filers holding RDNT, 159 increased or opened the position and 182 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in RDNT between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 12
- Schonfeld Strategic Advisors LLC$7M
- Temasek Holdings (Private) Ltd$5M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$5M
- BRANT POINT INVESTMENT MANAGEMENT LLC$2M
- Jupiter Topco LLC$2M
- Gradient Investments LLC$1M
Full exits 30
- Van Berkom & Associates Inc.$57M
- FULLER & THALER ASSET MANAGEMENT, INC.$45M
- BESSEMER GROUP INC$31M
- Penserra Capital Management LLC$30M
- Thrivent Financial for Lutherans$8M
- HARBOR CAPITAL ADVISORS, INC.$6M
Largest adds
- BlackRock, Inc.$303M
- RTW INVESTMENTS, LP$59M
- AMERICAN CENTURY COMPANIES INC$49M
- PRICE T ROWE ASSOCIATES INC /MD/$45M
- Defiance ETFs, LLC$45M
- VANGUARD PORTFOLIO MANAGEMENT LLC$33M
Largest trims
- FRANKLIN RESOURCES INC$25M
- Freestone Grove Partners LP$20M
- Point72 Asset Management, L.P.$17M
- SOROS FUND MANAGEMENT LLC$17M
- FMR LLC$12M
- Allspring Global Investments Holdings, LLC$8M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 10,957,808 | $676M | 14.4% | 2026-Q2 |
| RTW INVESTMENTS, LP added | 4,846,958 | $299M | 6.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 4,501,195 | $278M | 5.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 4,066,931 | $251M | 5.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,193,565 | $197M | 4.2% | 2026-Q2 |
| BECK MACK & OLIVER LLC trimmed | 3,163,592 | $195M | 4.2% | 2026-Q2 |
| STATE STREET CORP added | 2,842,457 | $175M | 3.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,858,508 | $115M | 2.4% | 2026-Q2 |
| Invesco Ltd. added | 1,641,292 | $101M | 2.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 1,618,424 | $100M | 2.1% | 2026-Q2 |
| Clearbridge Investments, LLC added | 1,546,652 | $95M | 2.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,491,040 | $92M | 2.0% | 2026-Q2 |
| Hood River Capital Management LLC added | 1,456,205 | $90M | 1.9% | 2026-Q2 |
| JB CAPITAL PARTNERS LP | 1,424,061 | $88M | 1.9% | 2026-Q2 |
| BAMCO INC /NY/ added | 1,260,992 | $78M | 1.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 1,178,372 | $73M | 1.5% | 2026-Q2 |
| Alyeska Investment Group, L.P. trimmed | 1,171,721 | $72M | 1.5% | 2026-Q2 |
| Defiance ETFs, LLC added | 1,143,622 | $75M | 1.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 1,052,356 | $65M | 1.4% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 975,542 | $60M | 1.3% | 2026-Q2 |
| MORGAN STANLEY added | 931,114 | $57M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 813,056 | $50M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 792,282 | $49M | 1.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. added | 757,990 | $47M | 1.0% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 745,603 | $46M | 1.0% | 2026-Q2 |
| Global Alpha Capital Management Ltd. added | 734,875 | $45M | 1.0% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 680,979 | $42M | 0.9% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 635,813 | $39M | 0.8% | 2026-Q2 |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. added | 633,272 | $39M | 0.8% | 2026-Q2 |
| Nuveen, LLC trimmed | 631,797 | $39M | 0.8% | 2026-Q2 |
| Polar Capital Holdings Plc trimmed | 623,029 | $38M | 0.8% | 2026-Q2 |
| UBS Group AG added | 619,635 | $38M | 0.8% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 608,144 | $40M | 0.9% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 604,907 | $37M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 507,472 | $31M | 0.7% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 501,405 | $31M | 0.7% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 495,962 | $31M | 0.7% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 492,437 | $30M | 0.6% | 2026-Q2 |
| Alpha Wave Global, LP trimmed | 472,643 | $29M | 0.6% | 2026-Q2 |
| NORGES BANK trimmed | 469,820 | $29M | 0.6% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 465,622 | $29M | 0.6% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 455,763 | $28M | 0.6% | 2026-Q2 |
| E. Ohman J:or Asset Management AB added | 452,966 | $28M | 0.6% | 2026-Q2 |
| Tidal Investments LLC trimmed | 439,560 | $27M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 420,661 | $26M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 420,575 | $26M | 0.6% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 418,874 | $26M | 0.6% | 2026-Q2 |
| EMERALD ADVISERS, LLC trimmed | 370,489 | $23M | 0.5% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 368,024 | $23M | 0.5% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 351,756 | $22M | 0.5% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 341,261 | $21M | 0.4% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 328,854 | $20M | 0.4% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 307,100 | $19M | 0.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 280,019 | $17M | 0.4% | 2026-Q2 |
| Penn Capital Management Company, LLC trimmed | 271,352 | $17M | 0.4% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 253,448 | $15M | 0.3% | 2026-Q2 |
| EMERALD MUTUAL FUND ADVISERS TRUST added | 250,764 | $15M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 243,111 | $15M | 0.3% | 2026-Q2 |
| WHITTIER TRUST CO trimmed | 238,975 | $16M | 0.4% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC trimmed | 217,394 | $13M | 0.3% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 211,269 | $13M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 208,109 | $13M | 0.3% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT trimmed | 202,005 | $12M | 0.3% | 2026-Q2 |
| PALISADE CAPITAL MANAGEMENT, LP trimmed | 199,431 | $12M | 0.3% | 2026-Q2 |
| First Eagle Investment Management, LLC added | 195,036 | $12M | 0.3% | 2026-Q2 |
| AGF MANAGEMENT LTD added | 188,565 | $12M | 0.2% | 2026-Q2 |
| SEB Asset Management AB added | 180,298 | $11M | 0.2% | 2026-Q2 |
| Granahan Investment Management, LLC added | 171,637 | $11M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 168,199 | $10M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 158,695 | $10M | 0.2% | 2026-Q2 |
| PARADIGM CAPITAL MANAGEMENT INC/NY added | 155,400 | $10M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 149,581 | $9M | 0.2% | 2026-Q2 |
| MAIRS & POWER INC | 133,116 | $8M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 132,400 | $8M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 131,291 | $8M | 0.2% | 2026-Q2 |
| Cerity Partners LLC added | 124,503 | $8M | 0.2% | 2026-Q2 |
| Pier Capital, LLC added | 123,018 | $8M | 0.2% | 2026-Q2 |
| WHITTIER TRUST CO OF NEVADA INC added | 121,590 | $8M | 0.2% | 2026-Q2 |
| ROBOTTI ROBERT added | 120,972 | $7M | 0.2% | 2026-Q2 |
| SOROS FUND MANAGEMENT LLC trimmed | 116,588 | $7M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC new | 115,308 | $7M | 0.2% | 2026-Q2 |
| Sequoia Financial Advisors, LLC added | 115,120 | $7M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 101,295 | $6M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 100,935 | $6M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 97,304 | $6M | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 96,115 | $6M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 91,487 | $5M | 0.1% | 2026-Q2 |
| Temasek Holdings (Private) Ltd new | 86,974 | $5M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 83,497 | $5M | 0.1% | 2026-Q2 |
| Holocene Advisors, LP trimmed | 80,436 | $5M | 0.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 80,081 | $5M | 0.1% | 2026-Q2 |
| Hilton Capital Management, LLC added | 78,427 | $5M | 0.1% | 2026-Q2 |
| Man Group plc added | 76,807 | $5M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 75,344 | $5M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 73,238 | $5M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 71,938 | $4M | 0.1% | 2026-Q2 |
| D.A. DAVIDSON & CO. added | 65,657 | $4M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 65,399 | $4M | 0.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 60,683 | $4M | 0.1% | 2026-Q2 |
| EFG International AG added | 54,436 | $3M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.