Vault-13

ACTINIUM PHARMACEUTICALS INC ATNM

COM · Common Stock · CUSIP 00507W206 · ISIN US00507W2061

47 institutional holders -7 vs Q1 2026
5,290,7695.3m shares reported held*
16.8% of all shares outstanding*
$5.2mreported value*
4 new 6 added 20 reduced 12 sold out net sold ≈ $598.2k (-610.4k shares)

* 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. Holder counts are more reliable. Shares outstanding: 31.4m 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 ≈ $0.98. Options: 3 managers hold calls ($25.3k notional), 0 hold puts (—).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0255075Q3 22: 57Q4 22: 59Q1 23: 65Q2 23: 72Q3 23: 59Q4 23: 60Q1 24: 68Q2 24: 75Q3 24: 73Q4 24: 70Q1 25: 70Q2 25: 64Q3 25: 61Q4 25: 60Q1 26: 54Q2 26: 4747Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202257
Q4 202259
Q1 202365
Q2 202372
Q3 202359
Q4 202360
Q1 202468
Q2 202475
Q3 202473
Q4 202470
Q1 202570
Q2 202564
Q3 202561
Q4 202560
Q1 202654
Q2 202647

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
50050Q3 24: 39 bought or addedQ3 24: 37 cut or sold outQ4 24: 37 bought or addedQ4 24: 31 cut or sold outQ4 24Q1 25: 33 bought or addedQ1 25: 25 cut or sold outQ2 25: 29 bought or addedQ2 25: 47 cut or sold outQ2 25Q3 25: 18 bought or addedQ3 25: 39 cut or sold outQ4 25: 22 bought or addedQ4 25: 27 cut or sold outQ4 25Q1 26: 15 bought or addedQ1 26: 26 cut or sold outQ2 26: 10 bought or addedQ2 26: 32 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20243937
Q4 20243731
Q1 20253325
Q2 20252947
Q3 20251839
Q4 20252227
Q1 20261526
Q2 20261032

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$100k$200k$300kQ3 25 calls: $113.0kQ3 25 puts: $800Q3 25P/C 0.01Q4 25 calls: $219.4kQ4 25 puts: $0Q4 25P/C 0.00Q1 26 calls: $147.5kQ1 26 puts: $0Q1 26P/C 0.00Q2 26 calls: $25.3kQ2 26 puts: $0Q2 26P/C 0.00
Numbers
QuarterCallsPutsP/C
Q3 2025$113.0k$8000.01
Q4 2025$219.4k$00.00
Q1 2026$147.5k$00.00
Q2 2026$25.3k$00.00

Biggest buyers

Bluespring Wealth Management, LLC New +43,000+43.0k
Qube Research & Technologies Ltd Added +39,764+39.8k
BlackRock, Inc. Added +24,686+24.7k
Vontobel Holding Ltd. Added +20,000+20.0k
NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO Added +1,550+1.6k
VANGUARD FIDUCIARY TRUST CO Added +1,261+1.3k
JONES FINANCIAL COMPANIES LLLP Added +1,000+1.0k
HARBOUR INVESTMENTS, INC. New +334+334
BARCLAYS PLC New +203+203
Axiom Investment Management LLC New +5+5

Biggest sellers

ACADIAN ASSET MANAGEMENT LLC Reduced -104,531-104.5k
RENAISSANCE TECHNOLOGIES LLC Reduced -91,109-91.1k
TWO SIGMA INVESTMENTS, LP Reduced -77,989-78.0k
GOLDMAN SACHS GROUP INC Sold out -70,241-70.2k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -67,176-67.2k
MILLENNIUM MANAGEMENT LLC Reduced -50,020-50.0k
TWO SIGMA SECURITIES, LLC Sold out -35,887-35.9k
NINE MASTS CAPITAL Ltd Sold out -35,227-35.2k
DIMENSIONAL FUND ADVISORS LP Sold out -34,923-34.9k
JANE STREET GROUP, LLC Sold out -34,299-34.3k

Biggest calls

JANE STREET GROUP, LLC Reduced $19.1k19.5k shares
GROUP ONE TRADING LLC Added $3.6k3.7k shares
SIMPLEX TRADING, LLC Reduced $2.5k2.6k shares

Biggest puts

None

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.

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.

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 1,238,3021.2m $1.2m $1.2m 0.00% Reduced -17.2k -17,214
2 COMPASS FINANCIAL MANAGEMENT LLC 0.07% of their portfolio TAMPA, FL 600,230600.2k $588.2k $588.2k 0.07% First filing
3 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 514,580514.6k $504.3k $504.3k 0.00% Reduced -50.0k -50,020
4 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 496,288496.3k $485.0k $485.0k 0.00% Reduced -104.5k -104,531
5 BlackRock, Inc. 0.00% of their portfolio New York, NY 395,896395.9k $388.0k $388.0k 0.00% Added +24.7k +24,686
6 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 380,491380.5k $372.9k $372.9k 0.00% Reduced -91.1k -91,109
7 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 324,945324.9k $318.6k $318.6k 0.00% Reduced -11.1k -11,128
8 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 259,179259.2k $254.0k $254.0k 0.00% Reduced -78.0k -77,989
9 GAGNON SECURITIES LLC 0.03% of their portfolio New York, NY 182,142182.1k $178.5k $178.5k 0.03% Reduced -19.2k -19,158
10 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 161,526161.5k $158.3k $158.3k 0.00% Added +1.3k +1,261
11 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 122,215122.2k $119.8k $119.8k 0.00% Reduced -4.0k -4,000
12 Gen-Wealth Partners Inc 0.03% of their portfolio ZEELAND, MI 105,111105.1k $103.0k $103.0k 0.03% Reduced -2.0k -2,000
13 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 69,74369.7k $68.3k $68.3k 0.00% Reduced -6.1k -6,112
14 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 57,81257.8k $56.7k $56.7k 0.00% Added +39.8k +39,764
15 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 56,82256.8k $55.7k $55.7k 0.00% Reduced -67.2k -67,176
16 Vontobel Holding Ltd. 0.00% of their portfolio ZURICH, V8 50,00050.0k $49.0k $49.0k 0.00% Added +20.0k +20,000
17 Bluespring Wealth Management, LLC 0.00% of their portfolio AUSTIN, TX 43,00043.0k $42.1k $42.1k 0.00% New
18 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio HOUSTON, TX 40,00040.0k $39.2k $39.2k 0.00% Unchanged
19 AM INVESTMENT STRATEGIES LLC 0.01% of their portfolio CHATTANOOGA, TN 29,35629.4k $29.0k $29.0k 0.01% Unchanged
20 Gerald Baker Financial Group LLC 0.01% of their portfolio ARLINGTON, TX 22,69122.7k $22.2k $22.2k 0.01% Unchanged
21 MAYPORT, LLC 0.00% of their portfolio NEWTON, MA 22,00022.0k $21.6k $21.6k 0.00% Unchanged
22 NORTH STAR ASSET MANAGEMENT INC 0.00% of their portfolio NEENAH, WI 20,00020.0k $19.6k $19.6k 0.00% Unchanged
23 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 19,80019.8k $19.4k $19.4k 0.00% Unchanged
24 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 18,86518.9k $18.5k $18.5k 0.00% Reduced -1.0k -1,000
25 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 13,73113.7k $13.5k $13.5k 0.00% Reduced -16.5k -16,479
26 Savvy Advisors, Inc. 0.00% of their portfolio NEW YORK, NY 10,00010.0k $9.8k $9.8k 0.00% Unchanged
27 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 8,8938.9k $8.7k $8.7k 0.00% Unchanged
28 UBS Group AG 0.00% of their portfolio ZURICH, V8 6,7586.8k $6.6k $6.6k 0.00% Reduced -7.9k -7,860
29 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 6,3416.3k $6.2k $6.2k 0.00% Reduced -7.3k -7,256
30 Rockefeller Capital Management L.P. 0.00% of their portfolio NEW YORK, NY 4,0004.0k $3.9k $3.9k 0.00% Unchanged
31 Steward Partners Investment Advisory, LLC 0.00% of their portfolio STAMFORD, CT 2,0002.0k $2.0k $2.0k 0.00% Reduced -166 -166
32 NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio MILWAUKEE, WI 1,6571.7k $1.6k $1.6k 0.00% Added +1.6k +1,550
33 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 1,4941.5k $1.5k $1.5k 0.00% Unchanged
34 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 1,3511.4k $1.3k $1.3k 0.00% Added +1.0k +1,000
35 NATIONAL BANK OF CANADA /FI/ 0.00% of their portfolio MONTREAL, A8 921921 $903 $903 0.00% Reduced -100 -100
36 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 492492 $482 $482 0.00% Reduced -50 -50
37 PITTENGER & ANDERSON INC 0.00% of their portfolio LINCOLN, NE 341341 $335 $335 0.00% Unchanged
38 HARBOUR INVESTMENTS, INC. 0.00% of their portfolio MADISON, WI 334334 $327 $327 0.00% New
39 NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio ST. LOUIS, MO 330330 $323 $323 0.00% Unchanged
40 Investors Research Corp 0.00% of their portfolio ATLANTA, GA 300300 $294 $294 0.00% Unchanged
41 Allied Private Wealth LLC 0.00% of their portfolio BOCA RATON, FL 240240 $232 $232 0.00% First filing
42 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 203203 $199 $199 0.00% New
43 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 201201 $197 $197 0.00% Reduced -36 -36
44 FEDERATED HERMES, INC. 0.00% of their portfolio PITTSBURGH, PA 137137 $134 $134 0.00% Reduced -1.3k -1,266
45 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 4545 $0 $0 0.00% Unchanged
46 Axiom Investment Management LLC 0.00% of their portfolio NEW YORK, NY 55 $5 $5 0.00% New
47 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 11 $1 $1 0.00% Unchanged