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Equibles

QUMS

Quantumsphere Acquisition Corp

Company with tickers: QUMS, QUMSR, QUMSU

CIK
2070900
CUSIP
G7387B106
Shares Outstanding
11,406,650
13F Activity (30d)
29 filings 28 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 29
Total Value: $76,462,443
Total Shares: 7,555,578

Institutional Ownership Trend

3 quarters

Holder Concentration

Across 29 13F filers · Δ vs Dec 31, 2025
Top Holder
9.7%
Sep 2025 → Mar 2026 · range 9.7% – 70.5%
−1.2 pts
Top 5
37.3%
Sep 2025 → Mar 2026 · range 37.3% – 100.0%
−3.7 pts
Top 10
64.5%
Sep 2025 → Mar 2026 · range 64.5% – 100.0%
−4.8 pts
HHI
530
Sep 2025 → Mar 2026 · range 530 – 5,732
Broadly held −73

Quarterly Activity

vs Dec 31, 2025
New
5
Increased
6
Decreased
7
Sold Out
1
Unchanged
11
Holder count: +4
Institutional value: +16.3%
Shares held: +15.0%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mid BERKLEY W R CORP +204,960 508,540
Large TORONTO DOMINION BANK +89,822 265,600
Mid WOLVERINE ASSET MANAGEMENT LLC +28,762 603,984
Mid MIZUHO SECURITIES USA LLC +13,898 731,984
Mega BNP PARIBAS ARBITRAGE, SA +12,708 115,048

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Large Clear Street Group Inc. −249,761 175,001
Mega TWO SIGMA INVESTMENTS, LP −182,188 35,291
Small Periscope Capital Inc. −25,000 100,000
Mid AQR Arbitrage LLC −14,366 308,294
Mid Virtu Financial LLC −2,480 22,303

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mid RIVERNORTH CAPITAL MANAGEMENT, LLC 424,512 $4,296,061
Mid Polar Asset Management Partners Inc. 400,000 $4,048,000
Small HIGHBRIDGE CAPITAL MANAGEMENT LLC 121,078 $1,225,309
Small Crossingbridge Advisors, LLC 107,825 $1,091,189
Small RLH Capital LLC 100,000 $1,012,000

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Micro Warberg Asset Management LLC 41,421 $414,624
Filter: New 5 Increased 6 Reduced 7 Sold out 1 Unchanged 11
Showing 29 of 29
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid MIZUHO SECURITIES USA LLC Broker-Dealer $7,407,678 9.69% 731,984
Mid WOLVERINE ASSET MANAGEMENT LLC $6,112,318 7.99% 603,984
Mid BERKLEY W R CORP $5,146,424 6.73% 508,540
Mid Karpus Management, Inc. $4,998,015 6.54% 493,875
Small Shaolin Capital Management LLC $4,857,600 6.35% 480,000
Mid RIVERNORTH CAPITAL MANAGEMENT, LLC $4,296,061 5.62% 424,512
Mid GLAZER CAPITAL, LLC $4,280,952 5.60% 423,019
Mega D. E. Shaw & Co., Inc. $4,147,783 5.42% 409,860
Mid Linden Advisors LP $4,048,000 5.29% 400,000
Mid Polar Asset Management Partners Inc. $4,048,000 5.29% 400,000
Mid AQR Arbitrage LLC $3,119,935 4.08% 308,294
Small HGC Investment Management Inc. $3,036,000 3.97% 300,000
Large TORONTO DOMINION BANK Bank $2,687,872 3.52% 265,600
Mid Westchester Capital Management, LLC $2,529,999 3.31% 250,000
Large Hudson Bay Capital Management LP $2,378,200 3.11% 235,000
Large Clear Street Group Inc. $1,771,010 2.32% 175,001
Small Cable Car Capital, LP $1,768,986 2.31% 174,801
Small Radcliffe Capital Management, L.P. $1,518,000 1.99% 150,000
Small HEIGHTS CAPITAL MANAGEMENT, INC $1,518,000 1.99% 150,000
Small HIGHBRIDGE CAPITAL MANAGEMENT LLC $1,225,309 1.60% 121,078
Mega BNP PARIBAS ARBITRAGE, SA $1,164,285 1.52% 115,048
Small Crossingbridge Advisors, LLC $1,091,189 1.43% 107,825
Small RLH Capital LLC $1,012,000 1.32% 100,000
Small Periscope Capital Inc. $1,012,000 1.32% 100,000
Large Schonfeld Strategic Advisors LLC $556,600 0.73% 55,000
Mega TWO SIGMA INVESTMENTS, LP $357,144 0.47% 35,291
Mid Virtu Financial LLC $225,706 0.30% 22,303
Small Logan Stone Capital, LLC $146,740 0.19% 14,500
Mega MORGAN STANLEY $637 0.00% 63

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