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 ($7.3m this quarter). Holder counts are more reliable. Shares outstanding: 76.9m as of 2025-08-08, 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 ≈ $56.90. Options: 6 managers hold calls ($2.2m notional), 6 hold puts ($1.1m).
Trends to Q2 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 |
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 2023 | 115 | 78 |
| 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 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $7.5m | $18.3m | 2.45 |
| Q4 2024 | $7.2m | $6.9m | 0.96 |
| Q1 2025 | $72.4m | $8.0m | 0.11 |
| Q2 2025 | $2.2m | $1.1m | 0.52 |
Biggest buyers
| AMERIPRISE FINANCIAL INC | Added | +618.4k |
| ROYAL BANK OF CANADA | Added | +597.1k |
| VOYA INVESTMENT MANAGEMENT LLC | Added | +449.0k |
| RTW INVESTMENTS, LP | Added | +372.8k |
| 8 KNOTS MANAGEMENT, LLC | New | +257.5k |
| Point72 Asset Management, L.P. | Added | +241.8k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Added | +236.6k |
| FRED ALGER MANAGEMENT, LLC | Added | +211.6k |
| Rockefeller Capital Management L.P. | Added | +200.2k |
| Woodline Partners LP | New | +197.3k |
Biggest sellers
| BlackRock, Inc. | Reduced | -689.2k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -483.9k |
| Alyeska Investment Group, L.P. | Reduced | -359.0k |
| Freestone Grove Partners LP | Sold out | -346.7k |
| T. Rowe Price Investment Management, Inc. | Reduced | -317.9k |
| MARSHALL WACE, LLP | Reduced | -151.7k |
| Portolan Capital Management, LLC | Reduced | -137.1k |
| TWO SIGMA INVESTMENTS, LP | Reduced | -136.9k |
| AXIOM INVESTORS LLC /DE | Reduced | -115.1k |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | -109.0k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.1m20.2k shares |
| CITADEL ADVISORS LLC | Reduced | $791.0k13.9k shares |
| Walleye Capital LLC | Reduced | $130.9k2.3k shares |
| Walleye Trading LLC | Reduced | $102.4k1.8k shares |
| GROUP ONE TRADING LLC | Reduced | $11.4k200 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $631.7k11.1k shares |
| Walleye Capital LLC | Added | $375.6k6.6k shares |
| Walleye Trading LLC | Reduced | $113.8k2.0k shares |
| GROUP ONE TRADING LLC | New | $5.7k100 shares |
| SIMPLEX TRADING, LLC | Reduced | $5.0k100 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 Q2 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 |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-06-05 | Murdock Michael N EVP, Mergers and Acquisitions | Sold | $646.2k11.1k shares |
| 2025-05-23 | Sorensen Alma Gregory EVP, Chief Science Officer, director | Sold | $3.1m55.0k shares |
| 2025-05-22 | Sorensen Alma Gregory EVP, Chief Science Officer, director | Sold | $2.6m45.0k shares |
| 2025-05-16 | Forthuber Stephen M Pres & COO-Eastern Operations | Sold | $1.1m18.8k shares |
| 2025-05-16 | Levitt Lawrence L Director | Sold | $305.4k5.0k shares |
| 2025-05-15 | HAMES NORMAN R Pres and COO-West Operations | Sold | $332.2k5.5k shares |
| 2025-05-15 | HAMES NORMAN R Pres and COO-West Operations | Sold | $174.7k2.9k 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 2025
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 9.3m $529.1m | Reduced -689.2k |
| VANGUARD GROUP INC 0.01% of their portfolio | 7.4m $420.5m | Added +89.5k |
| BECK MACK & OLIVER LLC 3.54% of their portfolio | 3.3m $185.7m | Reduced -17.3k |
| RTW INVESTMENTS, LP 2.18% of their portfolio | 2.7m $153.1m | Added +372.8k |
| STATE STREET CORP 0.01% of their portfolio | 2.5m $141.3m | Added +2.7k |
| Allspring Global Investments Holdings, LLC 0.17% of their portfolio | 1.8m $100.2m | Added +112.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.6m $93.4m | Added +37.4k |
| Invesco Ltd. 0.02% of their portfolio | 1.6m $92.7m | Added +108.9k |
| JB CAPITAL PARTNERS LP 15.64% of their portfolio | 1.5m $83.9m | Unchanged |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 1.4m $80.1m | Added +4.8k |
| AMERIPRISE FINANCIAL INC 0.02% of their portfolio | 1.4m $79.4m | Added +618.4k |
| Hood River Capital Management LLC 1.09% of their portfolio | 1.4m $78.4m | Added +21.0k |
| T. Rowe Price Investment Management, Inc. 0.05% of their portfolio | 1.3m $76.2m | Reduced -317.9k |
| AMERICAN CENTURY COMPANIES INC 0.04% of their portfolio | 1.3m $75.4m | Added +51.2k |
| PRINCIPAL FINANCIAL GROUP INC 0.04% of their portfolio | 1.2m $69.5m | Reduced -109.0k |
| Clearbridge Investments, LLC 0.06% of their portfolio | 1.2m $68.7m | Added +5.6k |
| Rockefeller Capital Management L.P. 0.08% of their portfolio | 1.2m $68.0m | Added +200.2k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 1.0m $58.1m | Added +597.1k |
| Alyeska Investment Group, L.P. 0.17% of their portfolio | 855.9k $48.7m | Reduced -359.0k |
| MORGAN STANLEY 0.00% of their portfolio | 836.3k $47.6m | Added +42.3k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 829.7k $47.2m | Added +178.9k |
| BAMCO INC /NY/ 0.12% of their portfolio | 810.0k $46.1m | Added +100.0k |
| LOOMIS SAYLES & CO L P 0.06% of their portfolio | 798.3k $45.4m | Reduced -19.3k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 736.9k $41.9m | Reduced -9.2k |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. 2.44% of their portfolio | 697.3k $39.7m | Added +3.0k |
| EMERALD ADVISERS, LLC 1.40% of their portfolio | 672.4k $38.3m | Added +27.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 656.2k $37.3m | Added +58.2k |
| Global Alpha Capital Management Ltd. 2.23% of their portfolio | 627.6k $35.7m | Added +72.5k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 552.3k $31.4m | Added +99.8k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.21% of their portfolio | 549.0k $31.2m | Added +82.0k |
| NORGES BANK 0.00% of their portfolio | 545.6k $31.1m | Reduced -22.2k |
| Nuveen, LLC 0.01% of their portfolio | 536.8k $30.5m | Reduced -14.8k |
| Tidal Investments LLC 0.20% of their portfolio | 526.5k $30.0m | Added +92 |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 524.2k $29.8m | Added +154.8k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 500.6k $28.5m | Added +7.5k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 490.8k $27.9m | Added +449.0k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 481.0k $27.4m | Reduced -11.2k |
| HARBOR CAPITAL ADVISORS, INC. 1.02% of their portfolio | 428.4k $24.4m | Added +449 |
| Bank of New York Mellon Corp 0.00% of their portfolio | 426.1k $24.2m | Added +8.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 425.5k $24.2m | Reduced -15.1k |
| EMERALD MUTUAL FUND ADVISERS TRUST 1.47% of their portfolio | 423.5k $24.1m | Reduced -7.5k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.04% of their portfolio | 403.1k $22.9m | Added +236.6k |
| Integral Health Asset Management, LLC 2.13% of their portfolio | 400.0k $22.8m | Added +150.0k |
| Alpha Wave Global, LP 2.38% of their portfolio | 387.5k $22.1m | Added +150.8k |
| Point72 Asset Management, L.P. 0.05% of their portfolio | 376.2k $21.4m | Added +241.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 376.0k $21.4m | Added +24.9k |
| BESSEMER GROUP INC 0.03% of their portfolio | 374.3k $21.3m | Added +16.3k |
| Portolan Capital Management, LLC 1.22% of their portfolio | 341.4k $19.4m | Reduced -137.1k |
| Penserra Capital Management LLC 0.27% of their portfolio | 334.2k $19.0m | Added +131.3k |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 329.6k $18.8m | Reduced -483.9k |
| FRED ALGER MANAGEMENT, LLC 0.08% of their portfolio | 325.4k $18.5m | Added +211.6k |
| SEGALL BRYANT & HAMILL, LLC 0.26% of their portfolio | 319.4k $18.2m | Added +54.4k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 286.6k $16.3m | Added +27.6k |
| Penn Capital Management Company, LLC 1.39% of their portfolio | 281.3k $16.0m | Added +7.0k |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 273.4k $15.6m | Reduced -30.1k |
| CITIGROUP INC 0.01% of their portfolio | 273.1k $15.5m | Reduced -39.5k |
| SEI INVESTMENTS CO 0.02% of their portfolio | 270.4k $15.4m | Added +12.6k |
| PICTON MAHONEY ASSET MANAGEMENT 0.21% of their portfolio | 262.9k $15.0m | Added +540 |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 261.0k $14.9m | Added +38.5k |
| 8 KNOTS MANAGEMENT, LLC 2.10% of their portfolio | 257.5k $14.7m | New |
| UBS Group AG 0.00% of their portfolio | 255.1k $14.5m | Reduced -59.0k |
| JENNISON ASSOCIATES LLC 0.01% of their portfolio | 251.8k $14.3m | Added +109.7k |
| Public Sector Pension Investment Board 0.05% of their portfolio | 225.1k $12.8m | Added +18.4k |
| WCM INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio | 215.5k $12.3m | Added +14.3k |
| WHITTIER TRUST CO 0.15% of their portfolio | 214.9k $12.2m | Added +3.9k |
| First Turn Management, LLC 2.10% of their portfolio | 197.8k $11.3m | Added +40.1k |
| Woodline Partners LP 0.06% of their portfolio | 197.3k $11.2m | New |
| Skandinaviska Enskilda Banken AB (publ) 0.05% of their portfolio | 196.6k $11.2m | Unchanged |
| ROBOTTI ROBERT 1.81% of their portfolio | 189.4k $10.8m | Reduced -3.7k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 185.8k $10.6m | Added +10.1k |
| PALISADE CAPITAL MANAGEMENT, LP 0.29% of their portfolio | 181.8k $10.3m | Added +101.6k |
| Legal & General Group Plc 0.00% of their portfolio | 178.2k $10.1m | Added +1.3k |
| KINGDON CAPITAL MANAGEMENT, L.L.C. 1.90% of their portfolio | 173.0k $9.8m | Added +96.0k |
| Cerity Partners LLC 0.02% of their portfolio | 149.4k $8.5m | Added +218 |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 146.6k $8.3m | Reduced -65.8k |
| AGF MANAGEMENT LTD 0.03% of their portfolio | 133.6k $7.6m | Reduced -2.2k |
| ROYCE & ASSOCIATES LP 0.08% of their portfolio | 133.6k $7.6m | Added +7.0k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 131.4k $7.5m | Reduced -6.5k |
| BARCLAYS PLC 0.00% of their portfolio | 129.4k $7.4m | Added +24.4k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 128.8k $7.3m | Added +48.3k |
| Pier Capital, LLC 1.09% of their portfolio | 126.1k $7.2m | Reduced -37.4k |
| Swiss National Bank 0.00% of their portfolio | 120.2k $6.8m | Reduced -1.7k |
| WHITTIER TRUST CO OF NEVADA INC 0.15% of their portfolio | 114.7k $6.5m | Added +4.3k |
| Sequoia Financial Advisors, LLC 0.04% of their portfolio | 112.8k $6.4m | Added +278 |
| AXIOM INVESTORS LLC /DE 0.05% of their portfolio | 109.5k $6.2m | Reduced -115.1k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 96.2k $5.5m | Reduced -4.8k |
| CASTLEARK MANAGEMENT LLC 0.16% of their portfolio | 96.2k $5.5m | Added +68.0k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.02% of their portfolio | 93.0k $5.3m | Added +1.4k |
| Nicholas Investment Partners, LP 0.42% of their portfolio | 82.2k $4.7m | Reduced -30.2k |
| Roubaix Capital, LLC 2.24% of their portfolio | 82.0k $4.7m | Reduced -3.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 81.6k $4.6m | Reduced -3.7k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 80.6k $4.6m | Reduced -39.9k |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 70.0k $4.0m | Added +1.0k |
| Rathbones Group PLC 0.02% of their portfolio | 69.5k $4.0m | Unchanged |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 68.8k $5.4m | Added +4.8k |
| First Light Asset Management, LLC 0.51% of their portfolio | 68.7k $3.9m | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 68.2k $3.9m | Added +825 |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 67.0k $3.8m | Added +13.1k |
| Advantage Alpha Capital Partners LP 1.01% of their portfolio | 65.5k $3.7m | Reduced -9.1k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 61.2k $3.5m | Reduced -3.7k |