RADNET INC RDNT
COM · Common Stock · CUSIP 750491102 · ISIN US7504911022
- SectorHealth care
- IndustryServices-Medical Laboratories
- HeadquartersLos Angeles, CA
- Websiteradnet.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($5.7m this quarter). Holder counts are more reliable. Shares outstanding: 77.1m as of 2025-11-07, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $76.24. Options: 6 managers hold calls ($6.1m notional), 6 hold puts ($5.8m).
Trends to Q3 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 154 |
| Q4 2022 | 146 |
| Q1 2023 | 153 |
| Q2 2023 | 187 |
| Q3 2023 | 192 |
| Q4 2023 | 215 |
| Q1 2024 | 278 |
| Q2 2024 | 279 |
| Q3 2024 | 305 |
| Q4 2024 | 332 |
| Q1 2025 | 309 |
| Q2 2025 | 330 |
| Q3 2025 | 329 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2023 | 104 | 90 |
| Q1 2024 | 168 | 87 |
| Q2 2024 | 142 | 141 |
| Q3 2024 | 154 | 125 |
| Q4 2024 | 159 | 137 |
| Q1 2025 | 164 | 167 |
| Q2 2025 | 199 | 112 |
| Q3 2025 | 185 | 134 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2024 | $7.2m | $6.9m | 0.96 |
| Q1 2025 | $72.4m | $8.0m | 0.11 |
| Q2 2025 | $2.2m | $1.1m | 0.52 |
| Q3 2025 | $6.1m | $5.8m | 0.95 |
Biggest buyers
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +1.9m |
| Polar Capital Holdings Plc | New | +832.2k |
| Van Berkom & Associates Inc. | Added | +817.8k |
| FULLER & THALER ASSET MANAGEMENT, INC. | New | +705.7k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | New | +525.8k |
| Alyeska Investment Group, L.P. | Added | +296.4k |
| MARSHALL WACE, LLP | Added | +290.2k |
| Freestone Grove Partners LP | New | +269.3k |
| GOLDMAN SACHS GROUP INC | Added | +215.4k |
| SOROS FUND MANAGEMENT LLC | New | +178.5k |
Biggest sellers
| ROYAL BANK OF CANADA | Reduced | -529.9k |
| Point72 Asset Management, L.P. | Sold out | -376.2k |
| Invesco Ltd. | Reduced | -366.8k |
| Rockefeller Capital Management L.P. | Reduced | -318.4k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -310.4k |
| HARBOR CAPITAL ADVISORS, INC. | Reduced | -304.1k |
| T. Rowe Price Investment Management, Inc. | Reduced | -267.9k |
| 8 KNOTS MANAGEMENT, LLC | Sold out | -257.5k |
| First Turn Management, LLC | Sold out | -197.8k |
| Woodline Partners LP | Sold out | -197.3k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.6m34.0k shares |
| CITADEL ADVISORS LLC | Added | $1.9m24.7k shares |
| JANE STREET GROUP, LLC | New | $922.1k12.1k shares |
| WOLVERINE TRADING, LLC | New | $590.1k7.9k shares |
| GROUP ONE TRADING LLC | Added | $99.1k1.3k shares |
| SIMPLEX TRADING, LLC | New | $38.0k500 shares |
Biggest puts
| MILLENNIUM MANAGEMENT LLC | New | $3.0m40.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $1.6m21.2k shares |
| CITADEL ADVISORS LLC | Reduced | $579.2k7.6k shares |
| JANE STREET GROUP, LLC | New | $312.5k4.1k shares |
| GROUP ONE TRADING LLC | Added | $228.6k3.0k shares |
| SIMPLEX TRADING, LLC | Added | $15.0k200 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-10-17 | 12.0% |
| RTW INVESTMENTS, LP 13G · institution +1.1 pts · filed 2026-08-14 | 6.2% |
| PRICE T ROWE ASSOCIATES INC /MD/ 13G · institution new · filed 2026-05-15 | 5.4% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.1% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)
Insider purchases and sales in Q3 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2023 | 0 | — | 2 | $451.4k | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 0 | — | 11 | $17.4m | — |
| Q3 2024 | 0 | — | 1 | $941.7k | — |
| Q4 2024 | 0 | — | 2 | $4.1m | — |
| Q1 2025 | 0 | — | 3 | $2.3m | — |
| Q2 2025 | 0 | — | 5 | $8.3m | — |
| Q3 2025 | 0 | — | 5 | $10.5m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-09-16 | STOLPER MARK EVP, Chief Financial Officer | Sold | $2.6m35.0k shares |
| 2025-09-16 | Katz David Jeffrey EVP and Chief Legal Officer | Sold | $1.0m14.0k shares |
| 2025-09-11 | Wesdorp Cornelis Pres & CEO, Digital Health | Sold | $36.1k500 shares |
| 2025-09-10 | HAMES NORMAN R Pres and COO-West Operations | Sold | $727.4k10.0k shares |
| 2025-09-09 | Wesdorp Cornelis Pres & CEO, Digital Health | Sold | $36.0k500 shares |
| 2025-08-27 | HAMES NORMAN R Pres and COO-West Operations · By Spouse | Sold | $355.5k5.0k shares |
| 2025-08-19 | Jayanathan Ranjan Chief Information Officer | Sold | $4.4m65.6k shares |
| 2025-08-19 | Wesdorp Cornelis Pres & CEO, Digital Health | Sold | $100.5k1.5k shares |
| 2025-08-13 | Katz David Jeffrey EVP and Chief Legal Officer | Sold | $1.2m17.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q3 2025
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 9.5m $720.5m | Added +157.4k |
| VANGUARD GROUP INC 0.01% of their portfolio | 7.5m $570.3m | Added +95.0k |
| BECK MACK & OLIVER LLC 4.54% of their portfolio | 3.3m $249.7m | Added +13.6k |
| RTW INVESTMENTS, LP 2.64% of their portfolio | 2.8m $214.6m | Added +125.2k |
| STATE STREET CORP 0.01% of their portfolio | 2.5m $193.4m | Added +55.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.02% of their portfolio | 2.1m $157.8m | Added +1.9m |
| Allspring Global Investments Holdings, LLC 0.22% of their portfolio | 1.7m $135.9m | Reduced -58.5k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.7m $126.9m | Added +24.7k |
| JB CAPITAL PARTNERS LP 18.58% of their portfolio | 1.4m $108.5m | Reduced -50.0k |
| AMERIPRISE FINANCIAL INC 0.02% of their portfolio | 1.4m $107.7m | Added +19.2k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.4m $105.0m | Reduced -30.0k |
| Hood River Capital Management LLC 1.23% of their portfolio | 1.4m $104.5m | Reduced -5.8k |
| AMERICAN CENTURY COMPANIES INC 0.05% of their portfolio | 1.3m $96.3m | Reduced -60.7k |
| Invesco Ltd. 0.02% of their portfolio | 1.3m $96.2m | Reduced -366.8k |
| Clearbridge Investments, LLC 0.07% of their portfolio | 1.2m $90.4m | Reduced -21.3k |
| Alyeska Investment Group, L.P. 0.27% of their portfolio | 1.2m $87.8m | Added +296.4k |
| PRINCIPAL FINANCIAL GROUP INC 0.04% of their portfolio | 1.1m $87.0m | Reduced -79.7k |
| T. Rowe Price Investment Management, Inc. 0.05% of their portfolio | 1.1m $81.7m | Reduced -267.9k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.0m $79.7m | Added +215.4k |
| Rockefeller Capital Management L.P. 0.13% of their portfolio | 877.1k $66.8m | Reduced -318.4k |
| Polar Capital Holdings Plc 0.31% of their portfolio | 832.2k $63.4m | New |
| Van Berkom & Associates Inc. 1.82% of their portfolio | 823.6k $62.8m | Added +817.8k |
| BAMCO INC /NY/ 0.16% of their portfolio | 810.1k $61.7m | Added +66 |
| LOOMIS SAYLES & CO L P 0.07% of their portfolio | 778.2k $59.3m | Reduced -20.1k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 756.4k $57.6m | Added +19.5k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 741.0k $56.5m | Added +84.8k |
| MORGAN STANLEY 0.00% of their portfolio | 731.9k $55.8m | Reduced -104.4k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.18% of their portfolio | 705.7k $53.8m | New |
| Global Alpha Capital Management Ltd. 3.06% of their portfolio | 702.8k $53.6m | Added +75.2k |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. 2.87% of their portfolio | 649.4k $49.5m | Reduced -47.9k |
| EMERALD ADVISERS, LLC 1.57% of their portfolio | 642.2k $48.9m | Reduced -30.2k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 557.0k $42.5m | Added +4.7k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.28% of their portfolio | 551.3k $42.0m | Added +2.3k |
| Nuveen, LLC 0.01% of their portfolio | 536.5k $40.9m | Reduced -242 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 536.2k $40.9m | Added +110.7k |
| Alpha Wave Global, LP 4.12% of their portfolio | 533.3k $40.6m | Added +145.8k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.17% of their portfolio | 525.8k $40.1m | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.04% of their portfolio | 490.4k $37.4m | Reduced -403 |
| FRED ALGER MANAGEMENT, LLC 0.15% of their portfolio | 490.3k $37.4m | Added +164.8k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 490.2k $37.4m | Reduced -529.9k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 486.4k $37.1m | Added +5.4k |
| Penserra Capital Management LLC 0.44% of their portfolio | 479.1k $36.5m | Added +144.9k |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 464.2k $35.4m | Reduced -60.0k |
| NEUBERGER BERMAN GROUP LLC 0.03% of their portfolio | 456.9k $34.8m | Added +170.3k |
| BESSEMER GROUP INC 0.05% of their portfolio | 443.3k $33.8m | Added +69.0k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 434.7k $33.1m | Reduced -65.8k |
| Tidal Investments LLC 0.14% of their portfolio | 433.6k $33.0m | Reduced -92.9k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 426.4k $32.5m | Added +392 |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 376.1k $28.7m | Added +102 |
| EMERALD MUTUAL FUND ADVISERS TRUST 1.47% of their portfolio | 372.8k $28.4m | Reduced -50.8k |
| SEGALL BRYANT & HAMILL, LLC 0.37% of their portfolio | 368.9k $28.1m | Added +49.5k |
| JENNISON ASSOCIATES LLC 0.02% of their portfolio | 360.2k $27.5m | Added +108.4k |
| UBS Group AG 0.01% of their portfolio | 346.8k $26.4m | Added +91.6k |
| MARSHALL WACE, LLP 0.03% of their portfolio | 310.2k $23.6m | Added +290.2k |
| Integral Health Asset Management, LLC 1.67% of their portfolio | 300.0k $22.9m | Reduced -100.0k |
| WCM INVESTMENT MANAGEMENT, LLC 0.04% of their portfolio | 285.8k $21.3m | Added +70.2k |
| Penn Capital Management Company, LLC 1.66% of their portfolio | 282.9k $21.6m | Added +1.6k |
| Public Sector Pension Investment Board 0.08% of their portfolio | 270.0k $20.6m | Added +44.9k |
| Freestone Grove Partners LP 0.15% of their portfolio | 269.3k $20.5m | New |
| SEI INVESTMENTS CO 0.02% of their portfolio | 265.7k $20.2m | Reduced -4.7k |
| PICTON MAHONEY ASSET MANAGEMENT 0.25% of their portfolio | 258.1k $19.7m | Reduced -4.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 247.5k $18.9m | Reduced -13.5k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio | 229.3k $17.5m | Reduced -173.9k |
| Portolan Capital Management, LLC 0.93% of their portfolio | 226.7k $17.3m | Reduced -114.7k |
| WHITTIER TRUST CO 0.19% of their portfolio | 218.8k $17.0m | Added +3.9k |
| AXIOM INVESTORS LLC /DE 0.11% of their portfolio | 201.9k $15.4m | Added +92.4k |
| Skandinaviska Enskilda Banken AB (publ) 0.06% of their portfolio | 196.6k $15.0m | Unchanged |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 188.0k $14.3m | Added +2.2k |
| ROBOTTI ROBERT 2.46% of their portfolio | 186.2k $14.2m | Reduced -3.3k |
| PALISADE CAPITAL MANAGEMENT, LP 0.37% of their portfolio | 180.0k $13.7m | Reduced -1.9k |
| Legal & General Group Plc 0.00% of their portfolio | 178.9k $13.6m | Added +652 |
| SOROS FUND MANAGEMENT LLC 0.22% of their portfolio | 178.5k $13.6m | New |
| AGF MANAGEMENT LTD 0.06% of their portfolio | 166.1k $12.7m | Added +32.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 152.3k $11.6m | Added +71.6k |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 146.8k $11.2m | Reduced -126.6k |
| Cerity Partners LLC 0.02% of their portfolio | 146.7k $11.2m | Reduced -2.7k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 128.6k $9.8m | Reduced -2.8k |
| Swiss National Bank 0.01% of their portfolio | 126.6k $9.6m | Added +6.4k |
| ROYCE & ASSOCIATES LP 0.09% of their portfolio | 124.9k $9.5m | Reduced -8.7k |
| HARBOR CAPITAL ADVISORS, INC. 0.74% of their portfolio | 124.4k $9.5m | Reduced -304.1k |
| Pier Capital, LLC 1.45% of their portfolio | 122.0k $9.3m | Reduced -4.0k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 120.9k $9.2m | Added +62.6k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 119.0k $9.1m | Reduced -9.8k |
| WHITTIER TRUST CO OF NEVADA INC 0.19% of their portfolio | 115.2k $8.9m | Added +452 |
| Sequoia Financial Advisors, LLC 0.05% of their portfolio | 113.0k $8.6m | Added +159 |
| CITIGROUP INC 0.01% of their portfolio | 107.3k $8.2m | Reduced -165.8k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 98.7k $7.5m | Added +31.7k |
| MAIRS & POWER INC 0.07% of their portfolio | 97.5k $7.4m | Added +39.8k |
| BARCLAYS PLC 0.00% of their portfolio | 96.5k $7.4m | Reduced -32.9k |
| First Eagle Investment Management, LLC 0.01% of their portfolio | 89.5k $6.8m | Added +37.5k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 75.0k $5.7m | Added +6.8k |
| AXA Investment Managers S.A. 0.01% of their portfolio | 72.9k $5.6m | First filing |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 72.8k $5.4m | Added +2.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 71.6k $5.5m | Added +10.4k |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 69.2k $5.3m | Added +392 |
| D.A. DAVIDSON & CO. 0.03% of their portfolio | 68.6k $5.2m | New |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 61.9k $4.7m | Added +3.6k |
| COMERICA BANK 0.02% of their portfolio | 61.5k $4.7m | Added +37.9k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 60.4k $4.6m | Reduced -35.8k |
| Pathstone Holdings, LLC 0.02% of their portfolio | 59.5k $4.5m | Added +6.8k |