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 ($5.6m this quarter). Holder counts are more reliable. Shares outstanding: 74.0m as of 2024-11-08, 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 ≈ $69.41. Options: 9 managers hold calls ($7.5m notional), 8 hold puts ($18.3m).
Trends to Q3 2024
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 |
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 2022 | 67 | 69 |
| Q1 2023 | 67 | 65 |
| Q2 2023 | 112 | 52 |
| Q3 2023 | 115 | 78 |
| Q4 2023 | 104 | 90 |
| Q1 2024 | 168 | 87 |
| Q2 2024 | 142 | 141 |
| Q3 2024 | 154 | 125 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2023 | $5.3m | $6.4m | 1.19 |
| Q1 2024 | $5.6m | $8.4m | 1.50 |
| Q2 2024 | $9.3m | $12.2m | 1.31 |
| Q3 2024 | $7.5m | $18.3m | 2.45 |
Biggest buyers
| VANGUARD GROUP INC | Added | +1.3m |
| MARSHALL WACE, LLP | Added | +1.1m |
| NORGES BANK | Added | +776.3k |
| Portolan Capital Management, LLC | Added | +390.0k |
| Munro Partners | New | +231.4k |
| HARBOR CAPITAL ADVISORS, INC. | Added | +227.7k |
| Cerity Partners LLC | Added | +220.1k |
| JB CAPITAL PARTNERS LP | Added | +206.8k |
| AXIOM INVESTORS LLC /DE | New | +191.1k |
| Hood River Capital Management LLC | Added | +157.3k |
Biggest sellers
| 8 KNOTS MANAGEMENT, LLC | Sold out | -509.2k |
| Alyeska Investment Group, L.P. | Reduced | -435.2k |
| AMERICAN CENTURY COMPANIES INC | Reduced | -409.3k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -275.4k |
| Nuveen Asset Management, LLC | Reduced | -215.3k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | -208.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | -204.8k |
| Skandinaviska Enskilda Banken AB (publ) | Reduced | -183.4k |
| NEUBERGER BERMAN GROUP LLC | Reduced | -169.3k |
| HSBC HOLDINGS PLC | Reduced | -164.1k |
Biggest calls
| CITADEL ADVISORS LLC | Reduced | $1.9m27.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.6m23.7k shares |
| MILLENNIUM MANAGEMENT LLC | Reduced | $1.4m20.0k shares |
| JANE STREET GROUP, LLC | Added | $915.9k13.2k shares |
| Walleye Capital LLC | Reduced | $825.7k11.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $513.0k7.4k shares |
| TUDOR INVESTMENT CORP ET AL | New | $242.9k3.5k shares |
| GROUP ONE TRADING LLC | Added | $34.7k500 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| MILLENNIUM MANAGEMENT LLC | Added | $13.9m200.0k shares |
| CITADEL ADVISORS LLC | Added | $1.5m21.6k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.4m20.8k shares |
| TUDOR INVESTMENT CORP ET AL | New | $520.4k7.5k shares |
| JANE STREET GROUP, LLC | New | $492.7k7.1k shares |
| SIMPLEX TRADING, LLC | Reduced | $360.0k5.2k shares |
| Walleye Capital LLC | Reduced | $145.7k2.1k 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 Q3 2024
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 2022 | 0 | — | 2 | $156.0k | — |
| Q1 2023 | 0 | — | 2 | $673.5k | — |
| Q2 2023 | 0 | — | 2 | $1.8m | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2024-08-21 | Murdock Michael N EVP, Mergers and Acquisitions | Sold | $941.7k15.0k 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 2024
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 9.6m $664.7m | First filing |
| VANGUARD GROUP INC 0.01% of their portfolio | 7.4m $510.2m | Added +1.3m |
| BECK MACK & OLIVER LLC 4.32% of their portfolio | 3.2m $221.9m | Reduced -71.0k |
| STATE STREET CORP 0.01% of their portfolio | 2.4m $169.7m | Added +30.2k |
| RTW INVESTMENTS, LP 1.82% of their portfolio | 1.8m $125.5m | Reduced -47.4k |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 1.8m $121.6m | Reduced -2.3k |
| Invesco Ltd. 0.02% of their portfolio | 1.7m $115.2m | Added +61.9k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.6m $107.9m | Added +11.6k |
| PRINCIPAL FINANCIAL GROUP INC 0.06% of their portfolio | 1.5m $104.5m | Added +118.5k |
| JB CAPITAL PARTNERS LP 20.10% of their portfolio | 1.5m $104.4m | Added +206.8k |
| Hood River Capital Management LLC 1.44% of their portfolio | 1.3m $89.0m | Added +157.3k |
| Allspring Global Investments Holdings, LLC 0.12% of their portfolio | 1.1m $78.5m | Added +119.9k |
| MARSHALL WACE, LLP 0.10% of their portfolio | 1.1m $76.1m | Added +1.1m |
| Global Alpha Capital Management Ltd. 4.33% of their portfolio | 960.0k $66.6m | Reduced -34.1k |
| MILLENNIUM MANAGEMENT LLC 0.05% of their portfolio | 860.4k $59.7m | Reduced -275.4k |
| LOOMIS SAYLES & CO L P 0.08% of their portfolio | 859.1k $59.6m | Reduced -19.7k |
| Alpha Wave Global, LP 18.29% of their portfolio | 848.4k $58.9m | Unchanged |
| NORGES BANK 0.01% of their portfolio | 807.3k $56.0m | Added +776.3k |
| Clearbridge Investments, LLC 0.04% of their portfolio | 734.5k $51.0m | Added +2.0k |
| FMR LLC 0.00% of their portfolio | 701.4k $48.7m | Added +2.2k |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. 2.61% of their portfolio | 677.4k $47.0m | Reduced -63.9k |
| EMERALD ADVISERS, LLC 1.80% of their portfolio | 669.2k $46.4m | Added +21.3k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 663.0k $46.0m | Added +28.7k |
| MORGAN STANLEY 0.00% of their portfolio | 647.2k $44.9m | Added +118.9k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 639.5k $44.4m | Reduced -153.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 637.3k $44.2m | Reduced -18.9k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 519.3k $36.0m | Reduced -215.3k |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 518.7k $36.0m | Reduced -90.4k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 512.3k $35.5m | Reduced -66.3k |
| T. Rowe Price Investment Management, Inc. 0.02% of their portfolio | 509.4k $35.4m | Reduced -382 |
| EMERALD MUTUAL FUND ADVISERS TRUST 1.83% of their portfolio | 508.5k $35.3m | Reduced -20.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 499.3k $34.6m | Reduced -5.7k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 492.8k $34.2m | Added +3.3k |
| Portolan Capital Management, LLC 2.47% of their portfolio | 491.4k $34.1m | Added +390.0k |
| Rockefeller Capital Management L.P. 0.09% of their portfolio | 486.4k $33.7m | Added +94.3k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.22% of their portfolio | 457.8k $31.8m | Added +68.3k |
| AMERICAN CENTURY COMPANIES INC 0.02% of their portfolio | 415.4k $28.8m | Reduced -409.3k |
| HARBOR CAPITAL ADVISORS, INC. 1.21% of their portfolio | 402.2k $27.9m | Added +227.7k |
| Cerity Partners LLC 0.06% of their portfolio | 387.5k $26.9m | Added +220.1k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 387.1k $27.3m | Added +41.4k |
| BESSEMER GROUP INC 0.04% of their portfolio | 381.2k $26.5m | Added +7.8k |
| VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio | 367.7k $25.5m | Reduced -37.8k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 361.4k $25.1m | Reduced -204.8k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 299.4k $20.8m | Reduced -63.0k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio | 283.3k $19.7m | Reduced -208.1k |
| ROBOTTI ROBERT 2.95% of their portfolio | 279.7k $19.4m | Reduced -7.6k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 266.0k $18.5m | Added +3.7k |
| EAGLE ASSET MANAGEMENT INC 0.10% of their portfolio | 262.9k $19.1m | Added +23.3k |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main 0.02% of their portfolio | 261.6k $18.2m | Unchanged |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 257.0k $17.8m | Added +7.4k |
| Skandinaviska Enskilda Banken AB (publ) 0.08% of their portfolio | 248.6k $17.2m | Reduced -183.4k |
| Alyeska Investment Group, L.P. 0.09% of their portfolio | 240.9k $16.7m | Reduced -435.2k |
| SEI INVESTMENTS CO 0.02% of their portfolio | 240.3k $16.7m | Added +82.1k |
| Munro Partners 0.58% of their portfolio | 231.4k $16.1m | New |
| Woodline Partners LP 0.13% of their portfolio | 229.5k $15.9m | Added +85.9k |
| SEGALL BRYANT & HAMILL, LLC 0.20% of their portfolio | 209.6k $14.5m | Added +90.4k |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 209.4k $14.5m | Reduced -27.3k |
| WHITTIER TRUST CO 0.18% of their portfolio | 197.9k $13.7m | Added +10.1k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 193.4k $13.4m | Reduced -169.3k |
| AXIOM INVESTORS LLC /DE 0.12% of their portfolio | 191.1k $13.3m | New |
| PICTON MAHONEY ASSET MANAGEMENT 0.49% of their portfolio | 181.8k $12.6m | Reduced -37.4k |
| Legal & General Group Plc 0.00% of their portfolio | 179.1k $12.4m | Reduced -6.3k |
| CITIGROUP INC 0.01% of their portfolio | 174.9k $12.1m | Added +32.7k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 174.2k $12.1m | Reduced -8.6k |
| AGF MANAGEMENT LTD 0.05% of their portfolio | 149.2k $10.4m | Unchanged |
| CI INVESTMENTS INC. 0.04% of their portfolio | 145.3k $10.1m | New |
| CASTLEARK MANAGEMENT LLC 0.41% of their portfolio | 143.2k $9.9m | Reduced -5.2k |
| Penn Capital Management Company, LLC 0.90% of their portfolio | 141.2k $9.8m | Reduced -571 |
| Public Sector Pension Investment Board 0.05% of their portfolio | 138.1k $9.6m | Reduced -8.2k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 135.9k $9.4m | New |
| Swiss National Bank 0.01% of their portfolio | 122.7k $8.5m | Reduced -500 |
| Pier Capital, LLC 1.19% of their portfolio | 121.5k $8.4m | Reduced -53.1k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 117.8k $8.2m | Reduced -6.8k |
| BARCLAYS PLC 0.00% of their portfolio | 117.0k $8.1m | Added +92.3k |
| GUGGENHEIM CAPITAL LLC 0.06% of their portfolio | 114.1k $7.9m | Reduced -1.5k |
| Calamos Advisors LLC 0.04% of their portfolio | 111.1k $7.7m | Reduced -2.0k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 109.4k $7.6m | Reduced -164.1k |
| ROYCE & ASSOCIATES LP 0.07% of their portfolio | 108.0k $7.5m | Reduced -63.6k |
| RAYMOND JAMES & ASSOCIATES 0.00% of their portfolio | 107.4k $7.5m | Added +19.4k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 104.4k $7.2m | Reduced -17.6k |
| First Eagle Investment Management, LLC 0.01% of their portfolio | 101.5k $7.0m | Added +9.1k |
| Rathbones Group PLC 0.04% of their portfolio | 101.0k $7.0m | Reduced -9.0k |
| WHITTIER TRUST CO OF NEVADA INC 0.18% of their portfolio | 100.6k $7.0m | Added +4.6k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 96.4k $6.7m | Added +3.0k |
| Global IMC LLC 1.35% of their portfolio | 96.2k $6.7m | Added +444 |
| KEYBANK NATIONAL ASSOCIATION/OH 0.02% of their portfolio | 88.6k $6.2m | Added +55 |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 80.7k $5.6m | Added +2.7k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 76.7k $5.3m | Reduced -10.5k |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 75.7k $5.3m | Reduced -3.8k |
| Penserra Capital Management LLC 0.10% of their portfolio | 67.7k $4.7m | Reduced -795 |
| FORMULA GROWTH LTD 1.57% of their portfolio | 65.8k $4.6m | Reduced -6.9k |
| Informed Momentum Co LLC 0.65% of their portfolio | 62.3k $4.3m | Reduced -8.9k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 62.0k $4.3m | Added +2.9k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 59.6k $4.1m | Reduced -1.8k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 55.5k $3.9m | Added +21.6k |
| Thrivent Financial for Lutherans 0.01% of their portfolio | 51.1k $3.5m | Reduced -4.1k |
| PARADIGM CAPITAL MANAGEMENT INC/NY 0.15% of their portfolio | 49.6k $3.4m | Reduced -1.3k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 48.9k $3.4m | Reduced -48.3k |
| Alberta Investment Management Corp 0.03% of their portfolio | 46.6k $3.2m | Reduced -25.1k |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY 0.03% of their portfolio | 46.5k $3.2m | Reduced -5.7k |