This company recently went public with an IPO on Wednesday, August 6th 2025. They issued 7,200,000 shares at $10.00 per share. We will continue to update data for QUMSU as it becomes available. Quantumsphere Acquisition (QUMSU) SEC Filings & 10K Form $10.05 +0.01 (+0.10%) As of 08/12/2025 03:31 PM Eastern Add Compare Share Share SEC Filings Stock AnalysisChartCompetitorsSEC FilingsTrendsBuy This Stock Recent Quantumsphere Acquisition SEC Filings All Filing Types 1 10 10-D 10-K 10-M 10-Q 11-K 12b-25 13F 13H 144 15 15F 17-H 18 18-K 19b-4(e) 19b-4 19b-7 1-A 1-E 1-K 1-N 1-SA 1-U 1-Z 20-F 24F-2 25 2-E 3 4 40-F 5 6-K 7-M 8-A 8-K 8-M 9-M ABS DD-15E ABS-15G ABS-EE ADV ADV-E ADV-H ADV-NR ADV-W ATS ATS-R BD BD-N BDW C CA-1 CB CFPORTAL D F-1 F-10 F-3 F-4 F-6 F-7 F-8 F-80 F-N F-X ID MA MA-I MA-NR MA-W MSD MSDW n/a N-14 N-17D-1 N-17f-1 N-17f-2 N-18f-1 N-1A N-2 N-23c-3 N-27D-1 N-3 N-4 N-5 N-54A N-54C N-6 N-6EI-1 N-6F N-8A N-8B-2 N-8B-4 N-8F N-CR N-CSR N-MFP N-PX N-Q NRSRO N-SAR PF PILOT R31 S-1 S-11 S-20 S-3 S-4 S-6 S-8 SBSE SBSE-A SBSE-BD SBSE-C SBSE-W SCI SD SDR SE SF-1 SF-3 SIP T-1 T-2 T-3 T-4 T-6 TA-1 TA-2 TA-W TCR TH WB-APP X-17A-19 X-17A-5 Part I X-17A-5 Part II X-17A-5 Part IIA X-17A-5 Part IIB X-17A-5 Part III X-17A-5 Schedule I X-17F-1A Filing Types Include Ownership Filings Exclude Ownership Filings Only Show Ownership FIlings Ownership Filings Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 2 Years 3 Years Time Frame Start Date End Date Export to Excel DateFilerForm TypeView08/11/20255:57 PMGong Qi (Reporting)Quantumsphere Acquisition (Issuer)Form 3Initial statement of beneficial ownership of securities 08/11/20255:59 PMQuantumsphere Acquisition (Issuer)Zhang Wei (Reporting)Form 3Initial statement of beneficial ownership of securities 08/11/20256:01 PMQuantumsphere Acquisition (Issuer)Whiteowl Holdings LLC (Reporting)Form 3Initial statement of beneficial ownership of securities 08/11/20255:54 PMQuantumsphere Acquisition (Issuer)Zhang Ping (Reporting)Form 3Initial statement of beneficial ownership of securities 08/07/20258:39 AMQuantumsphere Acquisition (Filer)Form 424B408/06/20256:16 AMQuantumsphere Acquisition (Filer)Form CERT08/05/202511:15 PMQuantumsphere Acquisition (Filer)Form EFFECT08/05/20254:27 PMQuantumsphere Acquisition (Filer)Form 8-A12B07/29/20258:56 PMQuantumsphere Acquisition (Filer)Form S-1/A07/23/20258:11 PMQuantumsphere Acquisition (Filer)Form S-1/A05/30/20252:44 PMQuantumsphere Acquisition (Filer)Form S-1Registration statement under Securities Act of 1933 (Data available from 1/1/2016 forward) Related Companies and Tools Related Companies ONCHU 10Q Form ASPCU 10Q Form AGBAW 10Q Form AGNCP 10Q Form AGNCO 10Q Form AGNCN 10Q Form AGNCM 10Q Form AGNCL 10Q Form ANSCW 10Q Form ANSCU 10Q Form SEC Filings Tools Latest SEC FilingsInsider Trading Activity This page (NASDAQ:QUMSU) was last updated on 8/13/2025 by MarketBeat.com Staff From Our PartnersYour blueprint for crypto wealthMark August 12th on your calendar. 27 of crypto's most successful minds are about to reveal everything…Crypto 101 Media | SponsoredTrump’s national nightmare is herePorter Stansberry and Jeff Brown say a new U.S. national emergency is already underway — and it could trigger ...Porter & Company | SponsoredThe Robotics Revolution has arrived … and one $7 stock could take off as a result.Something big is brewing in Washington. 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