Quantumsphere Acquisition CorpQUMS
Cash in trust
—
Not yet disclosed
Trust per share
$10.34
Redemption value
IPO
Aug 2025
$82.8M raised
Combination deadline
Feb 6, 2027
155 days remaining
Filings on record
41
Latest Sep 2, 2026
Overview
Quantumsphere Acquisition Corp is a special purpose acquisition company incorporated in Cayman Islands and registered with the SEC under CIK 0002070900. It completed its initial public offering in Aug 2025, raising $82.8M in gross proceeds and listing on Nasdaq. Class A shares trade under the ticker QUMS, units under QUMSU, rights under QUMSR on Nasdaq. The vehicle is sponsored by Whiteowl through Whiteowl Holdings LLC. IPO closed, trust funded, no definitive agreement announced.
Reading the filings
Arithmetic on what Quantumsphere Acquisition Corp has disclosed, written the way a desk would read it. These are observations, not a rating. Nothing here scores the vehicle or implies a view on it.
Trading at a premium to trust
At $10.35 the shares sit within a point of the $10.34 redemption value, so the market is pricing the cash and little else.
Trust versus the $10 unit
The trust holds $10.34 per public share, 3.4% above the $10.00 the units were sold at. That spread is accrued interest on the trust and, where the charter provides for it, sponsor contributions paid in to buy more time. It is the floor a public shareholder can redeem at, not a valuation of the business.
Time on the clock
155 days to the Feb 6, 2027 deadline. Still workable for a deal already in diligence, tight for one that has not been found. Watch for an extension proxy, which typically appears a month or two before the date.
Underwriting
EF Hutton led the offering. It has been named on 38 SPAC IPOs, book-running 28 of them, and 13.6% of its resolved vehicles closed a deal. The syndicate has no control over whether a sponsor finds a target, but the quality of the book at pricing shapes who ends up holding the units.
Scores
Recomputed 6m agoThree readings of Quantumsphere Acquisition Corp, each an unweighted mean of the components shown beneath it, and each component a percentile against every live SPAC rather than an absolute we invented. They describe the setup, not the merit. How they are built
Edge
ModerateHow much does the structure protect a holder right now?
43/100
- Discount to trust47
-0.10%
- Trust accretion61
$10.34 per share
- Runway21
155 days
Edge reads the setup, not the business. A vehicle can score well on protection and still be a poor place to leave money once a deal closes.
FOMO
ModerateHow much attention is this vehicle attracting right now?
36/100
- Filing activity56
3 in 30 days
- News coverage0
0 stories in 30 days
- Premium to trust54
0.10%
Attention is not quality. FOMO rises on news volume and on the market paying above trust, both of which have preceded plenty of disappointments.
Potential
ModerateHow likely is this vehicle to complete a combination, and at what scale?
40/100
- Lead bank record32
13.6%
- Bank franchise48
38 SPAC mandates
- Stage40
searching
Potential is about execution, not about the target. It says nothing about whether the eventual deal is worth owning, because the target is usually unknown when the score is computed.
These are derived measures, not ratings of investment merit. They carry no view on the target, no price target and no recommendation, and a high score is not a reason to buy anything.
SEC filing history
Free tier: filings older than 24 hours- 8-K
Termination of a material definitive agreement
Items 1.02, 9.01 · Accession 0001829126-26-009623
- 10-Q
Quarterly report
Accession 0001829126-26-008874
- SCHEDULE 13G
Beneficial ownership report (passive)
Accession 0001628280-26-054442
- 10-K/A
10-K/A
Accession 0001829126-26-007147
- 10-K
Annual report
Accession 0001829126-26-006482
- 8-K
Entry into a material definitive agreement
Items 1.01, 9.01 · Accession 0001829126-26-002191
- 10-Q
Quarterly report
Accession 0001829126-26-001512
- SCHEDULE 13G/A
Amended beneficial ownership report (passive)
Accession 0000902664-26-001097
- NT 10-Q
Late quarterly report notification
Accession 0001829126-26-001394
- SCHEDULE 13G
Beneficial ownership report (passive)
Accession 0001104659-26-013820
- 8-K
Entry into a material definitive agreement
Items 1.01, 9.01 · Accession 0001829126-26-000503
- 10-Q
Quarterly report
Accession 0001829126-25-009212
- SCHEDULE 13G
Beneficial ownership report (passive)
Accession 0000902664-25-004957
- SCHEDULE 13G
Beneficial ownership report (passive)
Accession 0001140361-25-041135
- 8-K/A
Other events
Items 8.01, 9.01 · Accession 0001829126-25-008044
- 8-K
Entry into a material definitive agreement; Regulation FD disclosure
Items 1.01, 7.01, 9.01 · Accession 0001829126-25-007899
- 8-K
Other events
Items 8.01, 9.01 · Accession 0001829126-25-007682
- 10-Q
Quarterly report
Accession 0001829126-25-007505
- SCHEDULE 13D
Beneficial ownership report (activist)
Accession 0001829126-25-007403
- 8-K
Other events
Items 8.01, 9.01 · Accession 0001829126-25-006233
- 3
Initial statement of beneficial ownership
Accession 0001829126-25-006134
- 3
Initial statement of beneficial ownership
Accession 0001829126-25-006073
- 3
Initial statement of beneficial ownership
Accession 0001829126-25-006072
- 3
Initial statement of beneficial ownership
Accession 0001829126-25-006071
- 3
Initial statement of beneficial ownership
Accession 0001829126-25-006070
- 8-K
Entry into a material definitive agreement; Other events
Items 1.01, 3.02, 5.02, 5.03, 8.01, 9.01 · Accession 0001829126-25-005919
- 424B4
Final IPO prospectus
Accession 0001829126-25-005885
- S-1MEF
Registration of additional IPO securities
Accession 0001829126-25-005844
- CERT
Exchange listing certification
Accession 0001354457-25-000768
- EFFECT
Notice of effectiveness
Accession 9999999995-25-002483
Quantumsphere Acquisition Corp: questions answered
What is Quantumsphere Acquisition Corp (QUMS)?
Quantumsphere Acquisition Corp is a special purpose acquisition company incorporated in Cayman Islands and registered with the SEC under CIK 0002070900. It completed its initial public offering in Aug 2025, raising $82.8M in gross proceeds and listing on Nasdaq. Class A shares trade under the ticker QUMS, units under QUMSU, rights under QUMSR on Nasdaq. The vehicle is sponsored by Whiteowl through Whiteowl Holdings LLC. IPO closed, trust funded, no definitive agreement announced.
How much does Quantumsphere Acquisition Corp hold in trust?
No trust balance has been disclosed in a filing we have indexed for Quantumsphere Acquisition Corp. For a newly priced IPO this is normal: the figure first appears in the quarterly report after closing.
When must Quantumsphere Acquisition Corp complete a merger?
By Feb 6, 2027. If no combination closes by then the sponsor must seek a further extension or wind the vehicle up and return the trust.
What happens if Quantumsphere Acquisition Corp does not find a target in time?
The charter requires the vehicle to redeem 100% of the public shares and return the trust, pro rata, to public shareholders. That is the mechanism working as designed rather than a default. Founder shares and warrants are worthless in that outcome, which is why the sponsor's incentive is to get a deal done or to buy more time. Across the market, deadline lapsed without a deal; trust returned to public shareholders.
Can I redeem shares in Quantumsphere Acquisition Corp, and at what price?
Public shareholders may elect to redeem in connection with a combination vote and at each extension vote, at the pro-rata trust value on the relevant record date, most recently disclosed at about $10.34 per share. Redemption is a right attached to the public shares only; warrants and rights carry no claim on the trust. The mechanics and the deadline for electing are set out in the proxy statement for the vote in question.
What tickers does Quantumsphere Acquisition Corp trade under?
Class A shares trade as QUMS on Nasdaq, the units as QUMSU, with rights as QUMSR. Units trade first and separate into their component securities roughly 52 days after the IPO; only the Class A shares carry the redemption right against the trust.
Is the trust value the same as the share price for Quantumsphere Acquisition Corp?
No, and the gap between them is the whole trade. Trust per share is a disclosed, contractual figure of $10.34, being what a redeeming holder receives. The market price is whatever the shares change hands at: most recently $10.35, a premium of 0.10% to the redemption value. Quotes on this site are delayed and indicative; confirm on your own venue before trading.
How much dilution do Quantumsphere Acquisition Corp's founder shares and warrants create?
Both are disclosed in the prospectus and both survive into the combined company, which is why a de-SPAC at $10 is not economically the same as an IPO at $10.
Who sponsors Quantumsphere Acquisition Corp, and what is their track record?
Whiteowl Holdings LLC is the sponsor entity, part of the Whiteowl franchise. This is the only vehicle we have attributed to that sponsor. Named principals: Ping Zhang.
Which banks underwrote the Quantumsphere Acquisition Corp IPO?
SPAC Advisory Partners, B. Riley Securities, EF Hutton. EF Hutton was credited as book-running manager on the cover. Syndicate membership and role are read from the prospectus cover and the underwriting section.
Is Quantumsphere Acquisition Corp tradeable, and where?
Yes. QUMS returned a live quote of $10.35 on Nasdaq. Quotes here are delayed and refreshed on a schedule rather than streamed, so treat the figure as indicative and confirm on your own venue. Units and warrants trade under their own symbols and are quoted separately.
Is Quantumsphere Acquisition Corp a good investment?
That is not a question this site answers. Quantumsphere Acquisition Corp is covered here as reference data: what the company filed, when it filed it, and what the numbers in those filings say. The Edge, FOMO and Potential scores on this page are derived measures with a published formula, not ratings of investment merit: they describe the setup, and every component is shown so you can take them apart. We publish no price targets and no recommendations, and nothing here should be read as advice. The figures are a starting point for your own work, and each one carries the accession number of the filing it came from.
Where does this Quantumsphere Acquisition Corp data come from?
Filings Quantumsphere Acquisition Corp submitted to the SEC under CIK 0002070900: the registration statement and final prospectus for the structure, quarterly and annual reports for the trust, current reports and proxy statements for deals, votes and extensions. Trust economics are taken from the registrant's own XBRL tags rather than parsed from prose, which is why they are exact. Every filing in the history above is listed with its accession number, which identifies the document uniquely on EDGAR; Pro accounts open it directly from the row.
Compiled by the SPACListing research desk
Last reconciled Sep 4, 2026
Every figure on this page is read from documents the registrants filed with the U.S. Securities and Exchange Commission, principally the IPO prospectus (Form 424B4), quarterly and annual reports, current reports and proxy statements, the registrant's own XBRL tags for trust economics. Nothing is sourced from press coverage, from the companies themselves, or from a third-party aggregator. Where a filing does not disclose something, the field is left blank rather than estimated.
Read the full methodology · What is in the dataset · Report a correction
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Continue reading
The context around this vehicle: who else the sponsor has launched, which banks priced it, and where it sits in the wider market.
Whiteowl: the full record
Every vehicle this sponsor has launched, what closed, what liquidated and what is still live.
EF Hutton in SPACs
Mandates, bookrun credit, deal volume and the outcome of the vehicles it priced.
All spacs searching for a target
IPO closed, trust funded, no definitive agreement announced.
Deadline calendar
Which sponsors are running out of time, and when the extension votes land.
What is a SPAC?
The structure, the economics and where the risks actually sit.
SPAC glossary
Every term in a blank-check filing, defined the way practitioners use it.
How this data is built
Coverage universe, ingestion, normalisation, lifecycle classification and known limits.