ATNM Institutional Ownership & Shareholders
ACTINIUM PHARMACEUTICALS INC (ATNM) is currently held by 43 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $4.60M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Vanguard Capital Management Llc is currently the largest disclosed institutional shareholder of ATNM tracked by InsiderSet, reporting ownership valued at approximately $1.21M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.88M, representing an estimated gain of +55.10% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 87% of the total disclosed ATNM value among the investors covered in this analysis. Major shareholders include Vanguard Capital Management Llc, Millennium Management Llc, Acadian Asset Management Llc, and several other long-term asset managers with concentrated positions in ACTINIUM PHARMACEUTICALS INC (ATNM).
This page ranks the largest institutional ATNM shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
43
Total Reported Value
$4.60M
Largest Holder
Vanguard Capital Management Llc
Largest Position
$1.21M
Insider Transactions (90d)
8
Latest Filing Quarter
Q2 2026
New Institutional Positions
69
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Vanguard Capital Management Llc | 0.00% | 1,238,302 | $1,213,536 | $1,882,219 | +$668,683 | +55.10% | |
| Millennium Management Llc | 0.00% | 514,580 | $504,288 | $782,162 | +$277,874 | +55.10% | |
| Acadian Asset Management Llc | 0.00% | 496,288 | $485,000 | $754,358 | +$269,358 | +55.54% | |
| Blackrock, Inc. | 0.00% | 395,896 | $387,978 | $601,762 | +$213,784 | +55.10% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 380,491 | $372,881 | $578,346 | +$205,465 | +55.10% |
| Geode Capital Management, Llc | 0.00% | 324,945 | $318,553 | $493,916 | +$175,363 | +55.05% | |
| Two Sigma Investments, Lp | 0.00% | 259,179 | $253,995 | $393,952 | +$139,957 | +55.10% | |
| Gagnon Securities Llc | 0.03% | 182,142 | $178,499 | $276,856 | +$98,357 | +55.10% | |
| Vanguard Fiduciary Trust Co | 0.00% | 161,526 | $158,295 | $245,520 | +$87,225 | +55.10% | |
| State Street Corp | 0.00% | 122,215 | $119,771 | $185,767 | +$65,996 | +55.10% | |
| Gen-Wealth Partners Inc | 0.03% | 105,111 | $103,009 | $159,769 | +$56,760 | +55.10% | |
| Northern Trust Corp | 0.00% | 69,743 | $68,348 | $106,009 | +$37,661 | +55.10% | |
| Qube Research & Technologies Ltd | 0.00% | 57,812 | $56,656 | $87,874 | +$31,218 | +55.10% | |
| Vontobel Holding Ltd. | 0.00% | 50,000 | $56,000 | $76,000 | +$20,000 | +35.71% | |
| Susquehanna International Group, Llp | 0.00% | 56,822 | $55,685 | $86,369 | +$30,684 | +55.10% | |
| Sns Financial Group, Llc | 0.00% | 43,000 | $42,140 | $65,360 | +$23,220 | +55.10% | |
| Bridgeway Capital Management, Llc | 0.00% | 40,000 | $39,200 | $60,800 | +$21,600 | +55.10% | |
| Am Investment Strategies Llc | 0.01% | 29,356 | $29,000 | $44,621 | +$15,621 | +53.87% | |
| Gerald Baker Financial Group Llc | 0.01% | 19,920 | $22,310 | $30,278 | +$7,968 | +35.72% | |
| Mayport, Llc | 0.00% | 22,000 | $21,560 | $33,440 | +$11,880 | +55.10% | |
| North Star Asset Management Inc | 0.00% | 20,000 | $19,600 | $30,400 | +$10,800 | +55.10% | |
| Wells Fargo & Company/Mn | 0.00% | 19,800 | $19,404 | $30,096 | +$10,692 | +55.10% | |
| Osaic Holdings, Inc. | 0.00% | 18,865 | $18,487 | $28,675 | +$10,188 | +55.11% | |
| Xtx Topco Ltd | 0.00% | 13,731 | $13,456 | $20,871 | +$7,415 | +55.11% | |
| Savvy Advisors, Inc. | 0.00% | 10,000 | $9,800 | $15,200 | +$5,400 | +55.10% | |
| Vanguard Global Advisers, Llc | 0.00% | 8,893 | $8,715 | $13,517 | +$4,802 | +55.10% | |
| Ubs Group Ag | 0.00% | 6,758 | $6,623 | $10,272 | +$3,649 | +55.10% | |
| Morgan Stanley | 0.00% | 6,341 | $6,214 | $9,638 | +$3,424 | +55.11% | |
| Rockefeller Capital Management L.P. | 0.00% | 4,000 | $3,920 | $6,080 | +$2,160 | +55.10% | |
| Steward Partners Investment Advisory, Llc | 0.00% | 2,000 | $1,960 | $3,040 | +$1,080 | +55.10% | |
| Jpmorgan Chase & Co | 0.00% | 1,494 | $1,479 | $2,271 | +$792 | +53.54% | |
| Jones Financial Companies Lllp | 0.00% | 1,351 | $1,337 | $2,054 | +$717 | +53.59% | |
| National Bank Of Canada | 0.00% | 921 | $903 | $1,400 | +$497 | +55.03% | |
| Sbi Securities Co., Ltd. | 0.00% | 492 | $551 | $748 | +$197 | +35.72% | |
| Cwm, Llc | 0.00% | 351 | $349 | $534 | +$185 | +52.87% | |
| Pittenger & Anderson Inc | 0.00% | 341 | $340 | $518 | +$178 | +52.45% | |
| Investors Research Corp | 0.00% | 300 | $336 | $456 | +$120 | +35.71% | |
| Harbour Investments, Inc. | 0.00% | 334 | $327 | $508 | +$181 | +55.25% | |
| Barclays Plc | 0.00% | 203 | $199 | $309 | +$110 | +55.06% | |
| Bnp Paribas Financial Markets | 0.00% | 201 | $197 | $306 | +$109 | +55.09% | |
| Federated Hermes, Inc. | 0.00% | 137 | $134 | $208 | +$74 | +55.40% | |
| Axiom Investment Management Llc | 0.00% | 5 | $5 | $8 | +$3 | +52.00% | |
| Caitong International Asset Management Co., Ltd | 0.00% | 1 | $1 | $2 | +$1 | +52.00% |
Frequently asked questions about ATNM
Who are the largest institutional holders of ATNM?
The largest institutional holders of ATNM reported in the latest SEC Form 13F filings include Vanguard Capital Management Llc, Millennium Management Llc, Acadian Asset Management Llc, Blackrock, Inc., and Renaissance Technologies LLC. InsiderSet ranks institutional holders by their latest reported ATNM position.
What is ATNM institutional ownership?
This page tracks ATNM positions reported by institutional investment managers through SEC Form 13F. ACTINIUM PHARMACEUTICALS INC (ATNM) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ATNM?
InsiderSet currently tracks 43 institutional managers reporting ATNM holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ATNM shareholders.
How much ATNM stock do institutions own?
Institutional investment managers disclosed approximately $4.60M in ATNM holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ATNM institutional ownership last updated?
The latest ATNM institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ATNM holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ATNM position after the reporting date.
Are institutions buying or selling ATNM?
Institutional buying and selling can be analyzed by comparing ATNM positions across consecutive 13F reporting periods. InsiderSet's ATNM Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ATNM ownership changes.
How has ATNM institutional ownership changed over time?
InsiderSet tracks ATNM institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.