Filer Snapshot

Quantumsphere Acquisition Corp

CIK 0002070900. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Company

Total Filings

36

Latest Filing

11 Mar 2026

Industry

Blank Checks

Follow future filing-backed changes

Save this filer to return when a new filing changes the portfolio, large-stake, insider, or company context.

Save and revisit

Save this filer page

Create a free account to keep this page in your watchlists. After verification, we will save it automatically and open your saved research list.

Create free account and save this filer Already have an account? Sign in and save it

Best next click

Start with the summary below, then verify the strongest source-backed page for this filer.

  • Open 13F if you want portfolio holdings.
  • Open 13D/G or insider pages only when this CIK has those rows.
Open insider trading context
Source: SEC filing 8-K

8-K filed on 11 Mar 2026 for CIK 0002070900.

View Source Filing
Symbol
QUMS, QUMSR, QUMSU on Nasdaq
Industry
Blank Checks (Office Of Real Estate & Construction)
Business address
1185 6 Th Ave., Suite 304, New York, NY, 10036
State of incorporation
Cayman Islands
Fiscal year end
31 March

Filer intelligence

What SEC filings say about Quantumsphere Acquisition Corp

A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.

Save filer

SEC source mix

Counts show available parsed rows, not one combined ownership total.

No XML rows yet
13F portfolio No rows yet

Quarterly institutional portfolio holdings.

13D/G stakes No rows yet

Beneficial ownership and large-stake disclosures.

Forms 3/4/5 No rows yet

Officer, director, and 10% owner holdings or transactions.

No parsed ownership summary yet

We still show the SEC filing timeline below. The intelligence summary will populate when parsed 13F, 13D/G, or Forms 3/4/5 data exists for this CIK.

Latest update

What changed recently for Quantumsphere Acquisition Corp

New fact period available

Latest financial period: Q4 2025. Open the source-backed page to inspect the fresh filing or facts context.

Update date

20 Feb 2026

Page type

Company facts

Latest period

Q4 2025

SEC-backed company facts were refreshed from filings filed on 20 Feb 2026.

Open company facts Browse recent public updates

Benchmark Context

Benchmark context for this company

Quantumsphere Acquisition Corp has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.

Why this is notable

Latest financial period: Q4 2025. That gives you a fresh baseline before you compare this company with peers.

  • Latest company facts filing date: 20 Feb 2026.
  • Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
  • Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

Open company facts Browse metric rankings

Filer Overview

Quantumsphere Acquisition Corp has filed 36 SEC EDGAR filings since 30 May 2025. Common forms include 8-K, 10-Q, SCHEDULE 13G/A, NT 10-Q and more.

Quantumsphere Acquisition Corp SEC filings Quantumsphere Acquisition Corp insider transactions Quantumsphere Acquisition Corp company facts QUMS holder history

Latest Filings

Recent SEC filings for Quantumsphere Acquisition Corp with direct links to document and filing folders.

SCHEDULE 13G/A File 005-95229

SCHEDULE 13G/A filing

Filing date
17 Feb 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
NT 10-Q File 001-42787

NT 10-Q

Filing date
17 Feb 2026
Reporting date
31 Dec 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13G File 005-95229

SCHEDULE 13G filing

Filing date
12 Feb 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13G File 005-95229

SCHEDULE 13G filing

Filing date
14 Nov 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13G File 005-95229

SCHEDULE 13G filing

Filing date
07 Nov 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13D File 005-95229

SCHEDULE 13D filing

Filing date
15 Sep 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
3

FORM 3

Filing date
12 Aug 2025
Reporting date
05 Aug 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
3

FORM 3

Filing date
11 Aug 2025
Reporting date
05 Aug 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
3

FORM 3

Filing date
11 Aug 2025
Reporting date
05 Aug 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
3

FORM 3

Filing date
11 Aug 2025
Reporting date
05 Aug 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
3

FORM 3

Filing date
11 Aug 2025
Reporting date
05 Aug 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
424B4 File 333-287672

424B4

Filing date
07 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
CERT File 001-42787

CERT filing

Filing date
06 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
EFFECT File 333-287672

EFFECT filing

Filing date
05 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
8-A12B File 001-42787

8-A12B

Filing date
05 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
CORRESP

CORRESP filing

Filing date
01 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
CORRESP

CORRESP filing

Filing date
01 Aug 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
S-1/A File 333-287672

S-1/A

Filing date
30 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
CORRESP

CORRESP filing

Filing date
29 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
UPLOAD File 333-287672

UPLOAD filing

Filing date
28 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
S-1/A File 333-287672

S-1/A

Filing date
24 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
S-1/A File 333-287672

S-1/A

Filing date
10 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
CORRESP

CORRESP filing

Filing date
10 Jul 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
UPLOAD File 333-287672

UPLOAD filing

Filing date
24 Jun 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
S-1 File 333-287672

S-1

Filing date
30 May 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing

About this filer

Quantumsphere Acquisition Corp files with the SEC under CIK 0002070900. This page aggregates EDGAR filings and related ownership activity.

Industry: Blank Checks.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Here you can make detailed settings or revoke your consent (in part if necessary) with effect for the future. For further information, please refer to our Privacy Policy .