Quantumsphere Acquisition (QUMSR) Stock: Why It's Down Today
Updated Oct 21, 2026, 4:00 PM ET · closing price
- Latest session (Wed Oct 21): $0.13, −$0.01 (-7.14%), volume 58.9x its 50-day average.
Sector peers moving today (SPACs & Blank Checks):ATII +36.82%DNMX -0.30%SVIV -0.20%VHCP -0.20%KOYN +0.20%
- Closed at $0.13, -7.14% vs the prior close of $0.14.
- Volume 4.47K shares, 58.9x its 50-day average (heavy).
- No new SEC filings since the prior session.
- No new insider buys or sales reported since the prior session.
Bold Eagle Acquisition (BEAG)Southport Acquisition Corp. II (PORT-UN)Archimedes Tech SPAC Partners II (ATII)Pine Tree Acquisition (PAXGU)EQV Ventures Acquisition Corp. II (EVAC)Frazier Life Sciences Acquisition Corp. II (FLSC)
QUMSR slides 7.1% to $0.13 on 58.9x normal volume. Closed at $0.13, -7.14% vs the prior close of $0.14. Day range $0.10–$0.13, opened at $0.10.
Why Did QUMSR Stock Move Today?
A plain-English, data-only note for every US trading day (today's note updates every 2 hours while the market is open). Newest first; older days stay archived below.
Oct 21, 2026 — QUMSR slides 7.1% to $0.13 on 58.9x normal volume
- Closed at $0.13, -7.14% vs the prior close of $0.14. Day range $0.10–$0.13, opened at $0.10.
- Volume was 4.47K shares, 58.9x its 50-day average of 76 — unusually heavy trading.
- 52-week range $0.10–$0.14; today's close sits at 71% of that range, 7.1% below the 52-week high.
QUMSR bull case vs bear case (from the data)
- No clear positive signal in the price trend, filings or insider data right now.
- High volatility: average daily move of 7.1% over 20 sessions.
- Thin trading (under $2M a day on average) can mean wide bid/ask spreads.
Latest QUMSR SEC 8-K & 10-Q Filings
Every SEC filing by or about QUMSR in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.
Oct 13, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 1.01 — Signed a material agreement.
- Item 7.01 — Released information under Regulation FD (e.g. a presentation or press release).
Oct 6, 2026 · Form SCHEDULE 13G/A — Update to a passive 5%+ stake (13G)
Update to a passive 5%+ stake (13G)
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Sep 2, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 1.02 — Ended a material agreement.
Aug 14, 2026 · Form 10-Q — Quarterly report
Quarterly report (unaudited financial statements for the quarter)
Quarter ended Jun 30, 2026:
- Net income: $574.01K (prior year -$15.55K) (swung to profit vs Jun 30, 2025)
Aug 6, 2026 · Form SCHEDULE 13G — Passive stake (13G)
Passive stake (13G) — an investor reported owning more than 5%
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Jul 1, 2026 · Form 10-K/A — Annual report (amended)
Amended annual report
Key figures from this report aren't in the SEC's structured data yet (usually appears within a day or two).
Things to know before you trade QUMSR
- How much it moves: over the last 20 sessions the average daily move was 7.14% (largest 7.1%). That is a volatile stock.
- Liquidity: about 2.27K shares (≈$296) trade per day on average. Thin volume can mean wider bid/ask spreads.
- 52-week position: $0.13 vs a range of $0.10–$0.14 (71% of the range).
- Dividends: no cash dividends in the last 2 years.
- Splits: none in the last 2 years.
- Insider trades (Form 4, last 12 months, recent 25 shown): 0 open-market buys, 0 sales.
- Latest filings: 8-K Oct 13, 2026; 8-K Sep 2, 2026; 10-Q Aug 14, 2026.
- Share count: 11.41M shares outstanding (Aug 14, 2026), +0.0% vs a year earlier.
- Listing: Nasdaq · industry: Blank Checks.
QUMSR market data (last 20 sessions)
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Oct 21, 2026 | 0.10 | 0.13 | 0.10 | 0.13 | 4.47K |
| Oct 16, 2026 | 0.14 | 0.14 | 0.14 | 0.14 | 76 |
About Quantumsphere Acquisition
Quantumsphere Acquisition (QUMSR) is listed on the Nasdaq and classified by the SEC under “Blank Checks”. Its business address is in NEW YORK, NY. State of incorporation: Cayman Islands. Fiscal year ends March 31. SEC CIK 2070900.
QUMSR board of directors & executives
From SEC Form 3/4/5 insider filings made in the last 12 months (date = latest filing).
Directors
| Name | Role | Latest filing |
|---|---|---|
| No Form 3/4/5 filings by this group in the last 12 months. | ||
Executive officers
| Name | Title | Latest filing |
|---|---|---|
| No Form 3/4/5 filings by this group in the last 12 months. | ||
Recent insider buys & sales
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| No open-market insider buys or sales reported in the last 12 months. | ||||
QUMSR financials (annual, from XBRL filings)
| Fiscal year end | Revenue | Net income | Diluted EPS | Operating cash flow |
|---|---|---|---|---|
| No annual XBRL figures available (foreign filers often report on Form 20-F). | ||||
Latest balance sheet: total assets $85.73M, total liabilities $3.54M, cash $0 (as of Jun 30, 2026).
QUMSR earnings / results-day log
| Date | Filing | Close that day |
|---|---|---|
| No 8-K earnings releases in recent filings. | ||
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Information only, not investment advice. BuyMeWhiskey is not a registered investment adviser or broker-dealer; nothing here is a recommendation to buy, sell or hold any security, and there are no price targets. Data comes from SEC EDGAR filings and public end-of-day market data and may be delayed or contain errors. Verify with the company's filings before making decisions. Prices: end-of-day data as of Oct 21, 2026, 4:00 PM ET. Filings: SEC EDGAR. Refreshed every 2 hours during US market hours.