QUMS

Quantumsphere Acquisition Co$10.32 0.00%
FinancialsUSCUSIP G7387B106· EOD Aug 26, 2026◍ Confluence graph
Tracked 13F Holders
24
+3 QoQ
13F Value (tracked)
$56.8M
Insider Net · 180d
$0
0↑ 0↓
Recent Filings
0
Smart-money sentimentMixed
BearishBullish
13F funds (latest Q)4 adding · 5 trimming
Insider net (180d)$0

Price & smart-money activity

$10.32 0.00%1Y +3.6%
$9.90$10.01$10.13$10.24$10.35Sep 2025DecFeb 2026AprJunAug21443
Hover for who · click for detailEnd-of-day closing prices52w $9.93 – $10.32

Who owns QUMS?

24 tracked 13F filers

24 tracked 13F filers disclose a position in QUMS as of the latest SEC 13F filings, a combined $56.8M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundPosition valueSharesLast moveAs ofHistory
1BERKLEY W R CORP
$5.1M
509K
+68%
Added · +205K sh
Q1 2026
2Karpus Management, Inc.
$5.0M
494K
−0.1%
Reduced · −475 sh
Q1 2026
3RIVERNORTH CAPITAL MANAGEMENT, LLC
$4.3M
425K
New
+425K sh
Q1 2026
4D. E. Shaw & Co., Inc.
$4.1M
410K
Held
Q1 2026
5Shaolin Capital Management LLC
$4.1M
406K
−15%
Reduced · −74K sh
Q2 2026
6LINDEN ADVISORS LP
$4.0M
400K
Held
Q1 2026
7Polar Asset Management Partners Inc.
$4.0M
400K
Held
Q1 2026
8HIGHBRIDGE CAPITAL MANAGEMENT LLC
$3.9M
378K
+212%
Added · +257K sh
Q2 2026
9AQR Arbitrage LLC
$3.1M
308K
−4.5%
Reduced · −14K sh
Q1 2026
10TORONTO DOMINION BANK
$2.7M
266K
+51%
Added · +90K sh
Q1 2026
11Westchester Capital Management, LLC
$2.5M
250K
Held
Q1 2026
12Hudson Bay Capital Management LP
$2.4M
235K
Held
Q1 2026
13Cable Car Capital, LP
$1.8M
175K
Held
Q2 2026
14Clear Street Group Inc.
$1.7M
165K
−5.8%
Reduced · −10K sh
Q2 2026
15HEIGHTS CAPITAL MANAGEMENT, INC
$1.5M
150K
Held
Q2 2026
16Radcliffe Capital Management, L.P.
$1.5M
150K
Held
Q1 2026
17BNP PARIBAS FINANCIAL MARKETS
$1.2M
115K
+12%
Added · +13K sh
Q1 2026
18Crossingbridge Advisors, LLC
$1.1M
108K
Held
Q2 2026
19Quarry LP
$767K
75K
New
+75K sh
Q2 2026
20PERISCOPE CAPITAL INC.
$767K
75K
−25%
Reduced · −25K sh
Q2 2026
21Schonfeld Strategic Advisors LLC
$562K
55K
Held
Q2 2026
22TWO SIGMA INVESTMENTS, LP
$357K
35K
−84%
Reduced · −182K sh
Q1 2026
23Logan Stone Capital, LLC
$147K
15K
Held
Q1 2026
24MORGAN STANLEY
$638
63
+110%
Added · +33 sh
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is QUMS being bought or sold by institutions?

Last quarter, 2 funds opened a new position in QUMS and 2 added to an existing one, while 5 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened (NEW)
2
funds
Added
2
funds
Reduced
5
funds
Exited
0
funds

Funds that own QUMS also own

CompanyCo-held byCombined value
CSLM DIGITAL ASSET ACQU - AKOYN19 funds$81.4M
SOULPOWER ACQUISITION CO-ASOUL18 funds$102.3M
THAYER VENTURES ACQUIS CL ATVAI18 funds$96.5M
OXLEY BRIDGE ACQUISITIO-CL AOBA18 funds$95.2M
K&F GROWTH ACQUISITION COR-AKFII17 funds$138.4M
APEX TREASURY CORP-CL AAPXT17 funds$120.9M
BERTO ACQUISITION CORPTACO17 funds$118.3M
ANDRETTI ACQUISITION CORP -APOLE17 funds$104.8M
CROWN RESERVE ACQUISITI-CL ACRAC17 funds$93.2M
SIZZLE ACQUISITION CORP-CL ASZZL17 funds$92.2M
SC II ACQUISITION CORP-CL ASCII17 funds$91.8M
AXIOM INTELLIGENCE-CL AAXIN17 funds$88.1M

Ranked by how many of QUMS's institutional holders also hold each name, a cross-fund conviction signal.

Insider activity (Form 4)

No open-market insider transactions on file yet. Grants, gifts, and exercises live on the full insider page.

Institutional ownership over time

22 funds+19 since Q3 2025
01122Q3 2025Q4 2025Q1 2026
funds holding aggregate valuelatest $55.3M

Share classes

Class13F holdersValue held
QUMSthis pageORD SHS24 funds$56.8M
QUMSRSPACS21 funds$1.2M
QUMSUUNIT 07/30/20306 funds$2.6M

Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.

Recent filings

0 shown

No filings captured for this ticker in the live stream yet.

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Ask your agent what changed in QUMS

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/QUMS/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for QUMS.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for QUMS. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.