# QUANTUM COMPUTING INC COM

QUANTUM COMPUTING INC COM is a security (CUSIP 74766W108) tracked across SEC portfolio filings. 329 institutional managers reported $803.4M on Form 13F as of 2026-06-30; 13 registered fund positions totaling $36.0M via N-PORT as of 2026-05-31.

## Summary

- Issuer: QUANTUM COMPUTING INC
- Class: COM
- CUSIP: 74766W108
- Asset category: EC
- 13F holders: 329
- 13F value: $803.4M
- 13F period: 2026-06-30
- N-PORT fund positions: 13
- N-PORT value: $36.0M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 329 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $172.8M | 16,841,423 |
| BlackRock, Inc. | New York, NY | $110.6M | 16,139,212 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $42.5M | 687,823 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $32.2M | 4,700,305 |
| STATE STREET CORP | BOSTON, MA | $30.9M | 4,516,820 |
| Defiance ETFs, LLC | NEW YORK, NY | $30.8M | 4,495,083 |
| Marex Group plc | London, X0 | $30.7M | 4,488,912 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $28.8M | 860,980 |
| CAPITAL FUND MANAGEMENT S.A. | PARIS, I0 | $23.7M | 1,700,895 |
| Bank of New York Mellon Corp | NEW YORK, NY | $19.2M | 1,975,697 |
| MORGAN STANLEY | NEW YORK, NY | $15.9M | 2,320,726 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | CENTRAL, K3 | $15.1M | 2,203,301 |
| WOLVERINE TRADING, LLC | CHICAGO, IL | $12.8M | — |
| [Walleye Trading LLC](https://search.stillhousedata.com/firm/136196) | NEW YORK, NY | $11.6M | — |
| NORTHERN TRUST CORP | CHICAGO, IL | $11.6M | 1,689,081 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $14.6M | 1.79% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $12.4M | 7.07% |
| [VANGUARD EXPLORER FUND](https://search.stillhousedata.com/fund/S000002578) | VANGUARD EXPLORER FUND | $3.8M | 1.75% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $2.3M | 4.71% |
| [Fidelity Nasdaq Composite Index ETF](https://search.stillhousedata.com/fund/S000006011) | Fidelity Commonwealth Trust | $936K | 0.86% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $795K | 0.13% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $756K | 0.25% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $193K | 4.61% |
| Nuveen Nasdaq 100 Dynamic Overwrite Fund | Nuveen NASDAQ 100 Dynamic Overwrite Fund | $182K | 1.30% |
| Nuveen S&P 500 Dynamic Overwrite Fund | Nuveen S&P 500 Dynamic Overwrite Fund | $103K | 0.41% |
| [TIAA Separate Account VA-1 - Stock Index Account](https://search.stillhousedata.com/fund/S000005098) | TIAA Separate Account VA-1 | $17K | 0.13% |
| [Berkshire Focus Fund](https://search.stillhousedata.com/fund/S000004886) | BERKSHIRE FUNDS | $69 | — |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $-36K | -0.10% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/74766W108.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.