Latest Period
Q1 2026
Security Snapshot
Actinium Pharmaceuticals, Inc. - Common Stock (ATNM) Institutional Ownership
CUSIP: 00507W206
13F Institutional Holders and Ownership History from Q1 2019 to Q1 2026
Institutions Reporting
53
Shares (Excl. Options)
5,301,014
Price
$1.00
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- Security type / class
- Equity / Common Stock
- Symbol
- ATNM on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 5,301,014
- Total 13F value
- $5,273,358
- Portfolio coverage rank
- 0%
- Share change
- -135,916
- Value change
- -$270,917
- Number of holders
- 53
- Shares outstanding
- 31,249,203
- SEC-reported price per share
- $1.31
- Insider filing price
- $1.31
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ATNM - Actinium Pharmaceuticals, Inc. - Common Stock is tracked under CUSIP 00507W206.
- 53 institutions reported positions in Q1 2026.
- 2 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 59 to 53 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $7,356,468 to $5,273,358.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 53 institutions filings for Q1 2026.
Security key
00507W206
Latest holder period
Q1 2026
13F holders
53
13D/G owners
2
CIK / CUSIP context first
Open Q1 2026 holders
ATNM full holder history
Actinium Pharmaceuticals, Inc. SEC filings
Actinium Pharmaceuticals, Inc. company facts
Actinium Pharmaceuticals, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00507W206:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
2
Security
ATNM
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | 4.4% | $1,920,576 | 1,371,840 | The Vanguard Group | 30 Jun 2025 | |||
| BlackRock, Inc. | 1.5% | $646,490 | 462,969 | BlackRock, Inc. | 30 Jun 2025 |
As of 31 Mar 2026, 53 institutional investors reported holding 5,301,014 shares of Actinium Pharmaceuticals, Inc. - Common Stock (ATNM). This represents 17% of the company’s total 31,249,203 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
16%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | 4% | 1,255,516 | 0% | 0% | $1,249,238 |
| ACADIAN ASSET MANAGEMENT LLC | 1.9% | 600,819 | -0.91% | 0% | $596,000 |
| MILLENNIUM MANAGEMENT LLC | 1.8% | 564,600 | -6.2% | 0% | $561,946 |
| RENAISSANCE TECHNOLOGIES LLC | 1.5% | 471,600 | +21% | 0% | $469,383 |
| BlackRock, Inc. | 1.2% | 371,210 | +1.2% | 0% | $369,466 |
| TWO SIGMA INVESTMENTS, LP | 1.1% | 337,168 | +61% | 0% | $335,583 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1% | 336,073 | +2.2% | 0% | $334,594 |
| GAGNON SECURITIES LLC | 0.64% | 201,300 | -0.25% | 0.05% | $200,354 |
| VANGUARD FIDUCIARY TRUST CO | 0.51% | 160,265 | 0% | 0% | $159,464 |
| STATE STREET CORP | 0.4% | 126,215 | 0% | 0% | $125,622 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.4% | 123,998 | +50% | 0% | $123,415 |
| Gen-Wealth Partners Inc | 0.34% | 107,111 | -0.02% | 0.03% | $106,608 |
| NORTHERN TRUST CORP | 0.24% | 75,855 | +78% | 0% | $75,498 |
| GOLDMAN SACHS GROUP INC | 0.22% | 70,241 | -0.17% | 0% | $69,911 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 0.13% | 40,000 | 0% | 0% | $39,812 |
| TWO SIGMA SECURITIES, LLC | 0.11% | 35,887 | +177% | 0% | $35,718 |
| NINE MASTS CAPITAL Ltd | 0.11% | 35,227 | +172% | 0.01% | $35,061 |
| DIMENSIONAL FUND ADVISORS LP | 0.11% | 34,923 | 0% | 0% | $34,759 |
| JANE STREET GROUP, LLC | 0.11% | 34,299 | -63% | 0% | $34,137 |
| XTX Topco Ltd | 0.1% | 30,210 | +16% | 0% | $30,068 |
| Vontobel Holding Ltd. | 0.1% | 30,000 | 0% | 0% | $29,859 |
| AM INVESTMENT STRATEGIES LLC | 0.09% | 29,356 | 0% | 0.01% | $29,000 |
| Gerald Baker Financial Group LLC | 0.07% | 22,691 | 0% | 0.01% | $22,584 |
| MAYPORT, LLC | 0.07% | 22,000 | 0% | 0% | $21,897 |
| NORTH STAR ASSET MANAGEMENT INC | 0.06% | 20,000 | 0% | 0% | $19,906 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
29
Latest
Q1 2026
Rows shown
1-25 of 29
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 5,301,014 | $5,273,358 | -$270,917 | $1.00 | 53 |
| 2025 Q4 | 5,410,603 | $7,356,468 | +$328,332 | $1.36 | 59 |
| 2025 Q3 | 5,146,844 | $8,234,489 | -$424,552 | $1.60 | 60 |
| 2025 Q2 | 5,475,849 | $7,665,146 | -$4,035,323 | $1.40 | 62 |
| 2025 Q1 | 8,198,200 | $13,196,751 | +$237,439 | $1.61 | 69 |
| 2024 Q4 | 8,134,174 | $10,248,048 | -$913,574 | $1.26 | 69 |
| 2024 Q3 | 8,459,139 | $15,901,857 | -$617,206 | $1.88 | 71 |
| 2024 Q2 | 7,246,907 | $53,627,942 | +$3,426,497 | $7.40 | 73 |
| 2024 Q1 | 6,729,352 | $52,695,053 | +$7,761,585 | $7.83 | 65 |
| 2023 Q4 | 5,758,372 | $29,252,507 | -$58,635 | $5.08 | 59 |
| 2023 Q3 | 5,762,849 | $34,114,400 | -$1,202,051 | $5.92 | 58 |
| 2023 Q2 | 6,040,790 | $44,822,973 | +$8,382,914 | $7.42 | 69 |
| 2023 Q1 | 4,756,784 | $44,950,334 | +$1,894,131 | $9.45 | 65 |
| 2022 Q4 | 4,488,300 | $47,826,517 | +$17,470,046 | $10.65 | 59 |
| 2022 Q3 | 2,863,634 | $21,129,560 | +$2,886,294 | $7.38 | 46 |
| 2022 Q2 | 2,464,649 | $11,852,572 | +$2,944,615 | $4.81 | 39 |
| 2022 Q1 | 1,829,833 | $9,346,008 | -$539,334 | $5.11 | 32 |
| 2021 Q4 | 1,908,876 | $11,473,412 | -$433,272 | $6.01 | 33 |
| 2021 Q3 | 1,932,424 | $17,120,867 | +$1,950,325 | $8.86 | 39 |
| 2021 Q2 | 1,727,482 | $13,663,637 | +$3,303,864 | $7.91 | 31 |
| 2021 Q1 | 1,310,290 | $9,986,632 | -$5,421,678 | $7.62 | 33 |
| 2020 Q4 | 2,003,580 | $15,628,122 | -$4,777,521 | $7.80 | 43 |
| 2020 Q3 | 2,385,295 | $23,109,542 | +$23,097,542 | $9.69 | 36 |
| 2020 Q2 | 3,868 | $13,000 | $4.22 | 2 | |
| 2020 Q1 | 1,498 | $12,000 | $8.01 | 1 |