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 ($5.3m this quarter). Holder counts are more reliable. Shares outstanding: 78.7m as of 2026-08-06, 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 ≈ $61.77. Options: 7 managers hold calls ($4.7m notional), 5 hold puts ($1.6m).
Trends to Q2 2026
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 |
| Q4 2025 | 343 |
| Q1 2026 | 341 |
| Q2 2026 | 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 |
|---|---|---|
| Q3 2024 | 154 | 125 |
| Q4 2024 | 159 | 137 |
| Q1 2025 | 164 | 167 |
| Q2 2025 | 199 | 112 |
| Q3 2025 | 185 | 134 |
| Q4 2025 | 163 | 146 |
| Q1 2026 | 179 | 150 |
| Q2 2026 | 165 | 164 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $6.1m | $5.8m | 0.95 |
| Q4 2025 | $46.9m | $55.9m | 1.19 |
| Q1 2026 | $8.0m | $2.5m | 0.32 |
| Q2 2026 | $4.7m | $1.6m | 0.33 |
Biggest buyers
| BlackRock, Inc. | Added | +922.1k |
| AMERICAN CENTURY COMPANIES INC | Added | +716.2k |
| Penserra Capital Management LLC | Added | +598.1k |
| Defiance ETFs, LLC | Added | +598.1k |
| RTW INVESTMENTS, LP | Added | +562.0k |
| BAMCO INC /NY/ | Added | +450.9k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Added | +443.6k |
| MILLENNIUM MANAGEMENT LLC | Added | +419.0k |
| E. Ohman J:or Asset Management AB | Added | +416.6k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +346.3k |
Biggest sellers
| Van Berkom & Associates Inc. | Reduced | -864.1k |
| FULLER & THALER ASSET MANAGEMENT, INC. | Sold out | -806.3k |
| FRANKLIN RESOURCES INC | Reduced | -453.0k |
| Freestone Grove Partners LP | Reduced | -365.2k |
| Point72 Asset Management, L.P. | Reduced | -362.9k |
| SOROS FUND MANAGEMENT LLC | Reduced | -321.9k |
| Allspring Global Investments Holdings, LLC | Reduced | -257.3k |
| FMR LLC | Reduced | -210.5k |
| BANK OF AMERICA CORP /DE/ | Reduced | -168.9k |
| AMERIPRISE FINANCIAL INC | Reduced | -153.5k |
Biggest calls
| CITADEL ADVISORS LLC | Reduced | $2.1m34.4k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $906.5k14.7k shares |
| Walleye Capital LLC | New | $641.4k10.4k shares |
| IMC-Chicago, LLC | Added | $481.0k7.8k shares |
| JANE STREET GROUP, LLC | Added | $462.5k7.5k shares |
| GROUP ONE TRADING LLC | New | $117.2k1.9k shares |
| SIMPLEX TRADING, LLC | Added | $18.5k300 shares |
Biggest puts
| HRT FINANCIAL LP | Added | $468.0k7.6k shares |
| Walleye Capital LLC | Added | $363.9k5.9k shares |
| CITADEL ADVISORS LLC | New | $265.2k4.3k shares |
| JANE STREET GROUP, LLC | Reduced | $265.2k4.3k shares |
| SIMPLEX TRADING, LLC | Added | $191.2k3.1k 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 since 1 Apr 2026
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 2024 | 0 | — | 2 | $4.1m | — |
| Q1 2025 | 0 | — | 3 | $2.3m | — |
| Q2 2025 | 0 | — | 5 | $8.3m | — |
| Q3 2025 | 0 | — | 5 | $10.5m | — |
| Q4 2025 | 0 | — | 2 | $7.4m | — |
| Q1 2026 | 0 | — | 1 | $1.9m | — |
| Q2 2026 | 0 | — | 3 | $3.0m | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-06-18 | SWARTZ DAVID L Director | Sold | $145.4k2.7k shares |
| 2026-06-16 | Wesdorp Cornelis Pres & CEO, Digital Health | Sold | $276.0k4.8k shares |
| 2026-06-15 | Forthuber Stephen M Pres & CEO-Eastern Operations | Sold | $2.6m44.1k 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, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 11.0m $675.8m | Added +922.1k |
| RTW INVESTMENTS, LP 2.55% of their portfolio | 4.8m $298.9m | Added +562.0k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.03% of their portfolio | 4.5m $277.6m | Added +346.3k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio | 4.1m $250.8m | Added +167.8k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 3.2m $196.9m | Added +82.6k |
| BECK MACK & OLIVER LLC 3.80% of their portfolio | 3.2m $195.1m | Reduced -2.6k |
| STATE STREET CORP 0.01% of their portfolio | 2.8m $175.2m | Added +190.9k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.9m $114.6m | Added +134.9k |
| Invesco Ltd. 0.01% of their portfolio | 1.6m $101.2m | Added +7.8k |
| AMERICAN CENTURY COMPANIES INC 0.04% of their portfolio | 1.6m $99.8m | Added +716.2k |
| Clearbridge Investments, LLC 0.08% of their portfolio | 1.5m $95.4m | Added +268.1k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.5m $91.9m | Added +112.0k |
| Hood River Capital Management LLC 0.65% of their portfolio | 1.5m $89.8m | Added +44.7k |
| JB CAPITAL PARTNERS LP 13.65% of their portfolio | 1.4m $87.8m | Unchanged |
| BAMCO INC /NY/ 0.12% of their portfolio | 1.3m $77.8m | Added +450.9k |
| Van Berkom & Associates Inc. 2.37% of their portfolio | 1.2m $73.6m | Reduced -864.1k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.2m $72.7m | Reduced -11.9k |
| Alyeska Investment Group, L.P. 0.19% of their portfolio | 1.2m $72.3m | Reduced -137.6k |
| Penserra Capital Management LLC 0.54% of their portfolio | 1.1m $70.5m | Added +598.1k |
| Defiance ETFs, LLC 1.04% of their portfolio | 1.1m $75.0m | Added +598.1k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 1.1m $64.9m | Reduced -58.9k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.20% of their portfolio | 975.5k $60.2m | Added +443.6k |
| MORGAN STANLEY 0.00% of their portfolio | 931.1k $57.4m | Added +80.6k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 813.1k $50.1m | Added +66.2k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 792.3k $48.9m | Added +24.8k |
| Rockefeller Capital Management L.P. 0.07% of their portfolio | 758.0k $46.7m | Added +54.9k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 745.6k $46.0m | Reduced -153.5k |
| Global Alpha Capital Management Ltd. 2.72% of their portfolio | 734.9k $45.3m | Added +76.7k |
| LOOMIS SAYLES & CO L P 0.05% of their portfolio | 681.0k $42.0m | Reduced -5.2k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 635.8k $39.2m | Reduced -37.4k |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. 1.93% of their portfolio | 633.3k $39.1m | Added +38.0k |
| Nuveen, LLC 0.01% of their portfolio | 631.8k $39.0m | Reduced -29.5k |
| Polar Capital Holdings Plc 0.11% of their portfolio | 623.0k $38.4m | Reduced -111.2k |
| UBS Group AG 0.01% of their portfolio | 619.6k $38.2m | Added +133.0k |
| Allspring Global Investments Holdings, LLC 0.06% of their portfolio | 608.1k $39.9m | Reduced -257.3k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 604.9k $37.3m | Added +187.5k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 507.5k $31.3m | Added +31.0k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 501.4k $30.9m | Added +33.1k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 496.0k $30.6m | Added +13.6k |
| Point72 Asset Management, L.P. 0.05% of their portfolio | 492.4k $30.4m | Reduced -362.9k |
| Alpha Wave Global, LP 0.47% of their portfolio | 472.6k $29.1m | Reduced -5.7k |
| NORGES BANK 0.00% of their portfolio | 469.8k $29.0m | Not comparable |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 465.6k $28.7m | Added +419.0k |
| NEUBERGER BERMAN GROUP LLC 0.02% of their portfolio | 455.8k $28.1m | Reduced -47.4k |
| E. Ohman J:or Asset Management AB 0.65% of their portfolio | 453.0k $27.9m | Added +416.6k |
| Tidal Investments LLC 0.07% of their portfolio | 439.6k $27.1m | Reduced -2.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 420.7k $25.9m | Reduced -168.9k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 420.6k $25.9m | Added +10.2k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 418.9k $25.8m | Reduced -4.8k |
| BESSEMER GROUP INC 0.03% of their portfolio | 397.4k $24.5m | Reduced -152.8k |
| First Eagle Investment Management, LLC 0.02% of their portfolio | 390.1k $24.1m | Added +295.9k |
| EMERALD ADVISERS, LLC 0.54% of their portfolio | 370.5k $22.8m | Reduced -11.3k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.02% of their portfolio | 368.0k $22.7m | Added +231.4k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.14% of their portfolio | 351.8k $21.7m | Reduced -29.7k |
| JENNISON ASSOCIATES LLC 0.01% of their portfolio | 341.3k $21.0m | Reduced -13.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.03% of their portfolio | 328.9k $20.3m | Added +30.1k |
| SEGALL BRYANT & HAMILL, LLC 0.22% of their portfolio | 307.1k $18.9m | Added +5.3k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 280.0k $17.3m | Reduced -115.8k |
| Penn Capital Management Company, LLC 1.06% of their portfolio | 271.4k $16.8m | Reduced -5.4k |
| WCM INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio | 253.4k $15.0m | Reduced -3.9k |
| EMERALD MUTUAL FUND ADVISERS TRUST 0.54% of their portfolio | 250.8k $15.5m | Added +167 |
| Public Sector Pension Investment Board 0.04% of their portfolio | 243.1k $15.0m | Reduced -6.1k |
| WHITTIER TRUST CO 0.16% of their portfolio | 239.0k $16.5m | Reduced -2.5k |
| FRED ALGER MANAGEMENT, LLC 0.04% of their portfolio | 217.4k $13.4m | Reduced -124.5k |
| ROYCE & ASSOCIATES LP 0.10% of their portfolio | 211.3k $13.0m | Added +74.3k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 208.1k $12.8m | Reduced -46.9k |
| PICTON MAHONEY ASSET MANAGEMENT 0.11% of their portfolio | 202.0k $12.5m | Reduced -107.1k |
| PALISADE CAPITAL MANAGEMENT, LP 0.54% of their portfolio | 199.4k $12.3m | Reduced -91.9k |
| AGF MANAGEMENT LTD 0.05% of their portfolio | 188.6k $11.6m | Added +1.2k |
| SEB Asset Management AB 0.04% of their portfolio | 180.3k $11.1m | Added +103.6k |
| Thrivent Financial for Lutherans 0.02% of their portfolio | 173.6k $10.7m | Added +32.1k |
| Granahan Investment Management, LLC 0.38% of their portfolio | 171.6k $10.6m | Added +67.4k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 168.2k $10.4m | Reduced -18.4k |
| Legal & General Group Plc 0.00% of their portfolio | 158.7k $9.8m | Added +664 |
| PARADIGM CAPITAL MANAGEMENT INC/NY 0.26% of their portfolio | 155.4k $9.6m | Added +100.7k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 149.6k $9.2m | Added +34.0k |
| MAIRS & POWER INC 0.08% of their portfolio | 133.1k $8.2m | Unchanged |
| Swiss National Bank 0.00% of their portfolio | 132.4k $8.2m | Added +2.5k |
| CITIGROUP INC 0.00% of their portfolio | 131.3k $8.1m | Added +41.6k |
| Cerity Partners LLC 0.01% of their portfolio | 124.5k $7.7m | Added +1.0k |
| Pier Capital, LLC 1.01% of their portfolio | 123.0k $7.6m | Added +4.1k |
| WHITTIER TRUST CO OF NEVADA INC 0.15% of their portfolio | 121.6k $8.2m | Added +423 |
| ROBOTTI ROBERT 1.20% of their portfolio | 121.0k $7.5m | Added +480 |
| SOROS FUND MANAGEMENT LLC 0.09% of their portfolio | 116.6k $7.2m | Reduced -321.9k |
| HARBOR CAPITAL ADVISORS, INC. 0.49% of their portfolio | 116.5k $7.2m | Added +11.3k |
| Schonfeld Strategic Advisors LLC 0.04% of their portfolio | 115.3k $7.1m | New |
| Sequoia Financial Advisors, LLC 0.04% of their portfolio | 115.1k $7.1m | Added +2.1k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 101.3k $6.2m | Reduced -35.9k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 100.9k $6.2m | Reduced -1.9k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 97.3k $6.0m | Added +39.9k |
| BARCLAYS PLC 0.00% of their portfolio | 96.1k $5.9m | Added +83.2k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 91.5k $5.1m | Reduced -21.6k |
| Temasek Holdings (Private) Ltd 0.01% of their portfolio | 87.0k $5.4m | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 83.5k $5.1m | Added +26.3k |
| Holocene Advisors, LP 0.01% of their portfolio | 80.4k $5.0m | Reduced -39.7k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.01% of their portfolio | 80.1k $4.9m | New |
| Hilton Capital Management, LLC 0.33% of their portfolio | 78.4k $4.8m | Added +3.9k |
| Man Group plc 0.01% of their portfolio | 76.8k $4.7m | Added +19.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 75.3k $4.6m | Reduced -2.3k |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 73.2k $4.5m | Added +1.9k |