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Quantum Computing Inc.

QUBT
Exchange
Nasdaq
Industry
Services-Prepackaged Software
SEC CIK
0001758009

No open-market purchases or sales by Quantum Computing Inc. insiders were filed in the last 90 days; 313 institutions reported holding it in 13F filings for Q2 2026, worth $994.9M in total; no superinvestor holds it.

Holders of 5% or more of QUBT

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Quantum Computing Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of QUBT
HolderLatest formStakeChangeFirst filedLatest filingFiling
BlackRock, Inc.13G/A6.70%15.0M shares+1.30 ppfrom 5.40%Oct 17, 20252 filingsJan 21, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

6 Schedule 13D and 13G filings on Quantum Computing Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on QUBT
Filed (ET)FilerFormStakeChangeEvent dateFiling
Mar 27, 202611:33 AM ETVanguard Group Inc13G/A0.00%0 shares−7.51 ppfrom 7.51%Below 5%Mar 13, 2026SEC
Jan 30, 20262:44 PM ETVanguard Group Inc13G/A7.51%16.8M shares+1.12 ppfrom 6.39%Dec 31, 2025SEC
Jan 21, 202612:30 PM ETBlackRock, Inc.13G/A6.70%15.0M shares+1.30 ppfrom 5.40%Dec 31, 2025SEC
Oct 17, 20256:24 PM ETBlackRock, Inc.13G5.40%10.1M sharesNewSep 30, 2025SEC
Oct 2, 20256:34 PM ETCitadel Advisors LLCand 6 others13G4.90%9.24M sharesNewBelow 5%Sep 25, 2025SEC
Jul 29, 20252:22 PM ETVanguard Group Inc13G6.39%9.91M sharesNewJun 30, 2025SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Quantum Computing Inc. shares.

No Form 144 notices for Quantum Computing Inc. are on file.