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Disclosery

ASPI ASP ISOTOPES INC

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COM (common), issuer CIK 1921865

171 managers (177 13F filers) reported a position in ASPI shares at 2026-03-31, 63,841,376 shares in all. 34 filers opened a position and 33 filers sold out during the quarter.

Managers
171
13F filers
177
New
34
Added
78
Reduced
40
Sold out
33
Shares held by filers
63,841,376

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.8,328,144$36.8M<0.01%+1,538,72713F-HRTimelineGroup
VANGUARD GROUP INCgroup of 6 filers holding6,936,395$30.7MnewTimeline
Encompass Capital Advisors LLCin group Encompass Capital Advisors LLC6,912,054$30.6M1.25%new13F-HRTimelineGroup
Rovida Investment Management Ltd4,100,000$18.1M2.27%013F-HRTimeline
UBS Group AGgroup of 2 filers holding2,954,185$13.1M+445,352Timeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC2,740,464$12.1M<0.01%+356,39813F-HRTimelineGroup
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.2,692,166$11.9M0.03%-2,203,38013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP2,322,159$10.3M<0.01%+477,75413F-HRTimelineGroup
EXCHANGE TRADED CONCEPTS, LLC2,183,554$9.65M0.07%+783,24013F-HRTimeline
AWM Investment Company, Inc.2,124,496$9.39M1.04%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY1,576,413$6.97M<0.01%-133,37013F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…1,057,340$4.67M0.01%-459,30313F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC1,012,956$4.48M<0.01%+506,16813F-HRTimelineGroup
Diametric Capital, LP953,505$4.21M1.1%+216,20113F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP937,523$4.14M<0.01%+191,61413F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co897,236$3.97M<0.01%+11,49713F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …887,245$3.92M<0.01%-57,08113F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC768,006$3.39M<0.01%-957,54713F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC684,479$3.03M<0.01%-902,48213F-HRTimelineGroup
Philadelphia Financial Management of Sa…648,341$2.87M0.92%new13F-HRTimeline
WIM INVESTMENT MANAGEMENT Ltd601,400$2.66M0.79%013F-HRTimeline
GROUP ONE TRADING LLC595,625$2.63M0.09%+151,28013F-HRTimeline
Sara-Bay Financial586,673$2.59M0.78%new13F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC526,795$2.33M<0.01%-1,188,49713F-HRTimelineGroup
Pacer Advisors, Inc.503,925$2.23M0.01%+99,55313F-HR/ATimeline
Chicago Partners Investment Group LLC374,078$2.1M0.05%new13F-HRTimeline
Shay Capital LLC429,500$1.9M0.27%-149,50013F-HRTimeline
Rathbones Group PLC386,566$1.71M0.01%-13,03313F-HR/ATimeline
Saba Capital Management, L.P.in group Saba Capital Management, L.P.357,625$1.58M0.05%+1,24813F-HRTimelineGroup
HITE Hedge Asset Management LLC326,227$1.44M0.08%-123,65613F-HRTimeline
Caprock Group, LLC321,000$1.42M0.03%-1,31413F-HRTimeline
Alight Capital Management LP300,000$1.33M0.39%new13F-HRTimeline
Yaupon Capital Management LP300,000$1.33M0.07%new13F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp289,009$1.28M<0.01%+45,02213F-HRTimelineGroup
IMC-Chicago, LLC268,469$1.19M0.02%-26,03313F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO273,462$1.15M<0.01%+78,98313F-HR/ATimelineGroup
Burkehill Global Management, LP250,000$1.1M0.05%013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/231,773$1.02M<0.01%+113,88713F-HRTimelineGroup
Purewater Capital LLC211,851$936K0.9%13F-HRTimeline
Swiss National Bank210,100$929K<0.01%013F-HRTimeline
Nuveen, LLCin group TIAA207,442$917K<0.01%+24,71713F-HRTimelineGroup
Arosa Capital Management LP200,000$884K0.58%013F-HRTimeline
Empowered Funds, LLC185,953$822K0.01%+51,35113F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/168,997$747K<0.01%-61,85913F-HRTimelineGroup
SBI Securities Co., Ltd.164,639$728K0.02%+12,51913F-HRTimeline
TUDOR INVESTMENT CORP ET AL161,030$712K<0.01%+28,09413F-HRTimeline
PRELUDE CAPITAL MANAGEMENT, LLC153,650$679K0.05%-74,83713F-HRTimeline
PFG Investments, LLC152,300$673K0.03%-29,50013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO148,648$657K<0.01%+71,64413F-HRTimelineGroup
Massar Capital Management, LP147,376$651K0.13%013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…145,627$644K<0.01%+16413F-HRTimelineGroup
Farther Finance Advisors, LLC150,216$617K0.01%+25,65313F-HRTimeline
POLEN CAPITAL MANAGEMENT LLC122,970$544K<0.01%-16,54113F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP120,525$533K<0.01%+10,67313F-HRTimelineGroup
RHUMBLINE ADVISERS117,678$520K<0.01%+16,14113F-HRTimeline
Cetera Investment Advisers114,817$507K<0.01%+43,51013F-HRTimeline
Belpointe Asset Management LLC101,562$449K0.02%new13F-HRTimeline
Canal Insurance CO100,000$442K0.09%013F-HRTimeline
SG Americas Securities, LLC97,985$433K<0.01%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\93,658$414K<0.01%+25,03813F-HRTimelineGroup
Marex Group Ltdin group Marex Group Ltd91,700$405K<0.01%+6,49913F-HRTimelineGroup
Pekin Hardy Strauss, Inc.88,450$391K0.04%+61,75013F-HRTimeline
FNY Investment Advisers, LLC86,600$382K0.17%+1,50013F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/86,120$380K<0.01%+23,72313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/80,641$357K<0.01%+31,59713F-HRTimeline
PEAK6 LLCin group PEAK6 LLC79,212$350K0.01%+69,93213F-HRTimelineGroup
Penn Capital Management Company, LLC78,822$348K0.03%-48,09413F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…78,212$346K<0.01%+1,00413F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management76,521$338K<0.01%-4,00613F-HRTimelineGroup
Headlands Technologies LLC75,166$332K0.04%new13F-HRTimeline
CITIGROUP INCin group CITIGROUP INC75,162$332K<0.01%-19013F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC70,597$312K<0.01%+43,11613F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…63,587$281K<0.01%+10,95413F-HRTimelineGroup
SIMPLEX TRADING, LLC61,648$272K0.01%-32,06813F-HRTimeline
DNB Asset Management ASin group DNB Asset Management AS59,782$264K<0.01%new13F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.56,634$250K<0.01%-2,91913F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc55,426$245K<0.01%-21,08513F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.53,972$239K<0.01%+3,28613F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…53,332$236K<0.01%+10,39213F-HRTimelineGroup
Virtu Financial LLCin group Virtu Financial LLC50,461$223K0.01%new13F-HRTimelineGroup
MH & ASSOCIATES SECURITIES MANAGEMENT C…50,096$221K0.19%+1,43013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN49,733$220K<0.01%-81,93813F-HR/ATimelineGroup
ALLIANCEBERNSTEIN L.P.38,760$207K<0.01%new13F-HRTimeline
Patriot Financial Group Insurance Agenc…44,980$199K0.01%+23,15513F-HRTimeline
LPL Financial LLC44,169$195K<0.01%-3,43113F-HRTimeline
Creative Planningin group Creative Planning41,580$184K<0.01%+31,15113F-HRTimelineGroup
Allegheny Financial Group40,649$180K0.02%+6,17613F-HRTimeline
Advisory Services Network, LLC40,248$178K<0.01%+5,87613F-HRTimeline
Scientech Research LLC40,230$178K0.15%+21,45513F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson39,000$172K<0.01%013F-HR/ATimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA37,954$167K<0.01%+5,90613F-HRTimelineGroup
Centiva Capital, LP36,544$162K0.01%+9,35813F-HRTimeline
Police & Firemen's Retirement System of…33,888$150K<0.01%+13,12813F-HRTimeline
Quantinno Capital Management LP33,067$146K<0.01%-23,70913F-HRTimeline
KLP KAPITALFORVALTNING AS31,600$140K<0.01%+14,90013F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …30,503$135K<0.01%+2,47013F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM29,210$129K<0.01%+7,53413F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND29,200$129K<0.01%+14,90013F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.30,410$128K0.02%new13F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS27,656$122K<0.01%+7,58713F-HRTimelineGroup
Cresset Asset Management, LLC27,284$121K<0.01%+2,25013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC26,451$117K<0.01%-3,06513F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC26,276$116K<0.01%new13F-HRTimelineGroup
Fortitude Advisory Group L.L.C.26,035$115K0.05%+4013F-HRTimeline
Caitong International Asset Management …25,297$112K0.02%-9,68613F-HRTimeline
Sanctuary Advisors, LLC24,615$109K<0.01%+4,46513F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC23,797$105K<0.01%-5,55913F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…23,600$104K<0.01%013F-HRTimeline
MIRABELLA FINANCIAL SERVICES LLP22,311$98.6K0.01%new13F-HRTimeline
Cambridge Investment Research Advisors,…21,531$95K<0.01%new13F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …20,000$88.4K<0.01%+3,00013F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC19,972$88.3K<0.01%-1,45513F-HRTimelineGroup
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC19,148$84.6K<0.01%+3,02613F-HRTimelineGroup
Brooklyn Investment Group18,868$83.4K<0.01%new13F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC18,230$80.6K<0.01%+4,81513F-HRTimelineGroup
Fielder Capital Group LLC18,083$79.9K0.02%+1713F-HRTimeline
Brookwood Investment Group LLC18,000$79.6K0.01%new13F-HRTimeline
Quantbot Technologies LP17,810$78.7K<0.01%-378,78913F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…17,466$77.2K<0.01%-54,53413F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC16,840$74.4K<0.01%new13F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…16,578$73.3K<0.01%+14,95113F-HRTimelineGroup
ProShare Advisors LLC16,481$72.8K<0.01%-42313F-HRTimeline
Perennial Advisors, LLC15,000$66.3K0.01%013F-HRTimeline
DRW Securities, LLC14,964$66.1K<0.01%+2,61413F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV14,779$65.3K<0.01%-10,77113F-HRTimeline
FMR LLCin group FMR LLC14,358$63.5K<0.01%+1,64813F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC12,806$56.6K<0.01%+1,57213F-HRTimeline
Allworth Financial LP12,445$55K<0.01%+12,39513F-HRTimeline
CAPTRUST FINANCIAL ADVISORS12,314$54.4K<0.01%new13F-HRTimeline
Chicago Capital, LLC12,000$53K<0.01%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd11,921$52.7K<0.01%new13F-HRTimelineGroup
Verition Fund Management LLC11,678$51.6K<0.01%-176,05013F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…11,334$50.1K<0.01%013F-HRTimelineGroup
COMMONWEALTH EQUITY SERVICES, LLC10,670$47.2K<0.01%-34,22913F-HRTimeline
CALTON & ASSOCIATES, INC.10,500$46.4K0.01%new13F-HRTimeline
Wealthfront Advisers LLC10,149$44.9K<0.01%new13F-HRTimeline
STEPHENS INC /AR/in group Stephens Investment Managemen…10,000$44.2K<0.01%new13F-HRTimelineGroup
Broadhurst Jeffrey B10,000$44.2K0.05%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…9,303$41.1K<0.01%+2,84013F-HRTimelineGroup
Steward Partners Investment Advisory, L…9,165$40.5K<0.01%-4,60013F-HRTimeline
Leonteq Securities AG9,000$39.8K<0.01%-19,51513F-HRTimeline
NISA INVESTMENT ADVISORS, LLC7,686$34K<0.01%+6,64813F-HRTimeline
TrinityBridge Ltd7,500$33K<0.01%013F-HRTimeline
State of Wyoming6,552$29K<0.01%new13F-HRTimeline
Federation des caisses Desjardins du Qu…6,180$27.3K<0.01%+4,00013F-HRTimeline
Smartleaf Asset Management LLC6,000$25.3K<0.01%new13F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…5,020$22.2K<0.01%+89913F-HRTimelineGroup
Evelyn Partners Investment Management L…in group Evelyn Partners Group Ltd5,000$22.1K<0.01%013F-HRTimelineGroup
Bank of New Hampshire3,000$13.3K<0.01%+1,00013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP2,852$12.5K<0.01%-2,03113F-HRTimelineGroup
Innovative Asset Advisors Group, LLC2,200$9.72K0.01%13F-HRTimeline
Hanson & Doremus Investment Management2,000$9K<0.01%+1,00013F-HRTimeline
Parallel Advisors, LLC1,873$8.28K<0.01%+33713F-HR/ATimeline
ROTHSCHILD INVESTMENT LLC1,695$7.49K<0.01%+1,68913F-HRTimeline
CWM, LLCin group CWM, LLC1,694$7.49K<0.01%+77313F-HRTimelineGroup
Larson Financial Group LLC1,242$5.49K<0.01%+1,07913F-HRTimeline
SIGNATUREFD, LLC1,000$4.42K<0.01%-12413F-HRTimeline
ADIRONDACK TRUST CO986$4.36K<0.01%new13F-HRTimeline
Sterling Capital Management LLC738$3.26K<0.01%+16213F-HRTimeline
Copia Wealth Management730$3.23K<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.710$3.14K<0.01%+30113F-HR/ATimelineGroup
Wilmington Savings Fund Society, FSB629$2.78K<0.01%new13F-HRTimeline
GAMMA Investing LLC546$2.41K<0.01%+29013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…540$2.39K<0.01%+44713F-HRTimelineGroup
Ascentis Independent Advisorsin group Ascentis Wealth Management, L…436$1.93K<0.01%new13F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\60$265<0.01%new13F-HRTimelineGroup
ISLAY CAPITAL MANAGEMENT, LLC39$172<0.01%013F-HRTimeline
MAI Capital Management28$124<0.01%new13F-HRTimeline
Root Financial Partners, LLC26$115<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…11$49<0.01%new13F-HR/ATimelineGroup
MassMutual Private Wealth & Trust, FSB10$44<0.01%-713F-HRTimeline