Quest Diagnostics Incorporated (DGX) Ownership
DGX ownership summary
as of October 18, 2026- Institutions
- 98.8% of shares outstanding
- Insiders
- 0.43% of shares outstanding
- Shares outstanding
- 110.4M
- Float
- 109.8M shares available to trade
- Short interest
- 3.11% 3.4M shares short
- Days to cover
- 3.00 short interest down 0.8% vs prior month
- Institutions 98.79%
- Insiders 0.43%
- Other investors 0.77%
DGX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 8.43% | 9.3M | $2.18B | +103,119 (+1.1%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.58% | 7.2M | $1.70B | +87,722 (+1.2%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 5.57% | 6.1M | $1.44B | +49,645 (+0.8%) | June 30, 2026 |
| 4 | State Street Corp | 5.02% | 5.5M | $1.30B | +135,822 (+2.5%) | June 30, 2026 |
| 5 | T. Rowe Price Associates, Inc. | 4.95% | 5.4M | $1.28B | −853,001 (−13.5%) | June 30, 2026 |
| 6 | Boston Partners Global Investors, Inc | 4.31% | 4.7M | $1.11B | +732,241 (+18.3%) | June 30, 2026 |
| 7 | JPMorgan Chase & Co | 3.20% | 3.5M | $827.3M | −326,018 (−8.5%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 2.85% | 3.1M | $737.4M | +51,565 (+1.7%) | June 30, 2026 |
| 9 | Morgan Stanley - Brokerage Accounts | 2.24% | 2.5M | $578.2M | −19,223 (−0.8%) | June 30, 2026 |
| 10 | EdgePoint Investment | 2.04% | 2.2M | $528.2M | +3,699 (+0.2%) | June 30, 2026 |
| 11 | Dimensional Fund Advisors, Inc. | 1.81% | 2.0M | $467.2M | +38,513 (+2.0%) | June 30, 2026 |
| 12 | Bank of America Corp | 1.76% | 1.9M | $454.8M | +182,231 (+10.4%) | June 30, 2026 |
| 13 | Grantham, Mayo, Van Otterloo & Co., LLC | 1.72% | 1.9M | $443.7M | +5,183 (+0.3%) | June 30, 2026 |
| 14 | Wells Fargo & Co | 1.59% | 1.8M | $411.5M | −11,549 (−0.7%) | June 30, 2026 |
| 15 | Davis Selected Advisers | 1.41% | 1.6M | $365.6M | −62,201 (−3.8%) | June 30, 2026 |
| 16 | Victory Capital Management Inc. | 1.41% | 1.6M | $364.4M | −295,780 (−16.0%) | June 30, 2026 |
| 17 | NORGES BANK | 1.28% | 1.4M | $330.6M | +83,957 (+6.3%) | June 30, 2026 |
| 18 | FMR Inc | 1.27% | 1.4M | $328.7M | +456,517 (+48.5%) | June 30, 2026 |
| 19 | Amvescap Plc. | 1.25% | 1.4M | $324.1M | −259,372 (−15.8%) | June 30, 2026 |
| 20 | Northern Trust Corp | 1.02% | 1.1M | $265.0M | +13,235 (+1.2%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 1.9M shares and 7 cut 1.8M.
DGX top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.20% | 3.5M | $826.6M | −7,408 (−0.2%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.64% | 2.9M | $681.3M | −41,631 (−1.4%) | September 30, 2026 |
| 3 | Vanguard MStar Mid Cap Index Instl | 2.15% | 2.4M | $555.4M | −30,948 (−1.3%) | September 30, 2026 |
| 4 | iShares Core S&P 500 ETF | 1.34% | 1.5M | $345.6M | −2,368 (−0.2%) | September 30, 2026 |
| 5 | Fidelity 500 Index | 1.31% | 1.4M | $337.7M | +5,516 (+0.4%) | August 31, 2026 |
| 6 | State Street® SPDR® S&P 500® ETF | 1.24% | 1.4M | $320.1M | — | September 30, 2026 |
| 7 | JHancock Disciplined Value Mid Cap I | 1.08% | 1.2M | $278.1M | −21,194 (−1.8%) | August 31, 2026 |
| 8 | EdgePoint Global Portfolio Series F | 1.07% | 1.2M | $276.4M | — | June 30, 2026 |
| 9 | JPMorgan Equity Income I | 1.02% | 1.1M | $263.7M | −23,826 (−2.1%) | August 31, 2026 |
| 10 | T. Rowe Price Dividend Growth | 1.00% | 1.1M | $257.3M | — | September 30, 2026 |
| 11 | Victory Sycamore Established Value R | 0.96% | 1.1M | $247.9M | −232,000 (−18.0%) | June 30, 2026 |
| 12 | Vanguard MStar Value Index Investor | 0.96% | 1.1M | $247.1M | −5,790 (−0.5%) | September 30, 2026 |
| 13 | JHancock Disciplined Value I | 0.95% | 1.0M | $246.6M | −15,525 (−1.5%) | August 31, 2026 |
| 14 | Invesco S&P 500® Equal Weight ETF | 0.76% | 832K | $195.4M | −1,710 (−0.2%) | September 30, 2026 |
| 15 | State Street®HlthCrSelSectSPDR®ETF | 0.71% | 783K | $183.9M | +2,432 (+0.3%) | September 30, 2026 |
| 16 | T. Rowe Price US Large-Cap Core | 0.68% | 746K | $175.3M | — | September 30, 2026 |
| 17 | Vanguard MStar Mid Cap Value ETF | 0.63% | 689K | $161.9M | −27,541 (−3.8%) | September 30, 2026 |
| 18 | JPMorgan Mid Cap Value L | 0.59% | 654K | $153.8M | −30,202 (−4.4%) | August 31, 2026 |
| 19 | Vanguard Dividend Appreciation ETF | 0.57% | 624K | $146.7M | −2,142 (−0.3%) | September 30, 2026 |
| 20 | Fidelity Puritan | 0.54% | 599K | $140.8M | +314,600 (+110.5%) | July 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
DGX insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-05 | Michael E Prevoznik | Sell | $206.21 | 3,878 | $799,682 |
| 2026-03-05 | Patrick Plewman | Sell | $206.21 | 2,855 | $588,730 |
| 2026-03-05 | Catherine T Doherty | Sell | $206.21 | 5,558 | $1.1M |
| 2026-03-04 | Karthik Kuppusamy | Sell | $204.86 | 2,628 | $538,372 |
| 2026-02-19 | Catherine T Doherty | Sell | $204.83 | 1,433 | $293,521 |
| 2026-02-19 | Michael E Prevoznik | Sell | $204.83 | 1,111 | $227,566 |
| 2026-02-19 | Patrick Plewman | Sell | $204.83 | 958 | $196,227 |
| 2026-02-17 | Ro Khanna | Sell | $205.46 | — | — |
| 2026-02-10 | Patrick Plewman | Sell | $204.00 | 5,662 | $1.2M |
| 2026-01-29 | Ro Khanna | Buy | $182.31 | — | — |
| 2025-11-25 | J. E Davis | Sell | $192.22 | 55,093 | $10.6M |
| 2025-11-25 | Vicky B Gregg | Sell | $191.76 | 1,250 | $239,700 |
| 2025-11-18 | Mark E Delaney | Sell | $187.35 | 7,946 | $1.5M |
| 2025-11-03 | Julie Johnson | Sell | $179.04 | — | — |
| 2025-10-22 | Gary M Pfeiffer | Sell | $182.40 | 1,482 | $270,317 |
| 2025-09-26 | Michael E Prevoznik | Sell | $188.13 | 227 | $42,706 |
| 2025-09-24 | Michael E Prevoznik | Sell | $187.02 | 175 | $32,728 |
| 2025-09-23 | Michael E Prevoznik | Sell | $187.12 | 28,288 | $5.3M |
| 2025-08-21 | Patrick Plewman | Sell | $185.00 | 1,975 | $365,375 |
| 2025-08-19 | Patrick Plewman | Sell | $183.00 | 4,532 | $829,356 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
DGX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns DGX
Institutional investors own 98.8% of Quest Diagnostics's shares and insiders 0.43%. The largest holder is BlackRock Inc with 8.43% of the shares (9.3M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 3.11% of the float, or 3.00 days of average trading volume. The share count fell 23.3% since 2014.
Related: DGX analyst forecast, DGX key metrics, DGX dividend history. See the DGX stock overview for the latest quote and news.
DGX ownership FAQ
Who owns the most Quest Diagnostics stock?
The largest shareholders of Quest Diagnostics are BlackRock Inc (8.43%), Vanguard Capital Management, LLC (6.58%), Vanguard Portfolio Management, LLC (5.57%), State Street Corp (5.02%), T. Rowe Price Associates, Inc. (4.95%).
What percentage of Quest Diagnostics is owned by institutions?
Institutions hold 98.8% of Quest Diagnostics's shares outstanding; insiders hold 0.43%.
Which funds own Quest Diagnostics?
The largest fund holders of Quest Diagnostics are Vanguard MStar Total Stk Mkt Idx Invest (3.20%), Vanguard 500 Index Investor (2.64%), Vanguard MStar Mid Cap Index Instl (2.15%), iShares Core S&P 500 ETF (1.34%), Fidelity 500 Index (1.31%).
What is Quest Diagnostics's short interest?
3.4M shares of Quest Diagnostics were sold short, 3.11% of the float; at the average daily volume it would take 3.00 days to cover.
Are insiders buying or selling Quest Diagnostics?
Of the latest 20 reported insider transactions in Quest Diagnostics (since August 19, 2025), 1 were purchases and 19 were sales.
How many shares of Quest Diagnostics are outstanding?
Quest Diagnostics has 110.4M shares outstanding, of which 109.8M are in the public float.