Quest Diagnostics Incorporated
Quest Diagnostics Incorporated (DGX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · DGX · as of Sep 30, 2025
Ownership Breakdown
1,029
Institutional Holders
▲ 11 vs Q2
$19.97B
Total Inst. Value
▲ $682.56M vs Q2
110.70M
Shares Outstanding
freeFloat 99.51%
104.96M
13F Shares Held
▼ 2.49M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
DGX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC services-medical laboratories | 14.25M | 12.72% | 12.72% | $2.72T | Nov 7, 2025 | ▲ 18.1K |
BLACKROCK, INC. services-medical laboratories | 10.00M | 8.93% | 8.93% | $1.91T | Nov 12, 2025 | ▼ 310.9K |
PRICE T ROWE ASSOCIATES INC /MD/ services-medical laboratories | 7.01M | 6.26% | 6.26% | $1.34T | Nov 14, 2025 | ▼ 188.7K |
STATE STREET CORP services-medical laboratories | 5.22M | 4.66% | 4.66% | $995.58B | Nov 14, 2025 | ▲ 38.9K |
JPMORGAN CHASE & CO services-medical laboratories | 4.32M | 3.85% | 3.85% | $822.81B | Nov 26, 2025 | ▼ 14.3K |
BOSTON PARTNERS services-medical laboratories | 4.04M | 3.60% | 3.60% | $767.98B | Nov 13, 2025 | ▲ 997.0K |
GEODE CAPITAL MANAGEMENT, LLC services-medical laboratories | 3.04M | 2.71% | 2.71% | $576.44B | Nov 12, 2025 | ▲ 54.1K |
VICTORY CAPITAL MANAGEMENT INC services-medical laboratories | 2.34M | 2.09% | 2.09% | $446.71B | Nov 12, 2025 | ▼ 465.3K |
MORGAN STANLEY services-medical laboratories | 2.29M | 2.04% | 2.04% | $435.84B | May 27, 2026 | ▲ 141.8K |
DIMENSIONAL FUND ADVISORS LP services-medical laboratories | 1.91M | 1.70% | 1.70% | $363.51B | Nov 12, 2025 | ▲ 6.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+3.91M shares0
New Positions
first time holders26
Decreased
−3.59M shares0
Sold Out
fully exitedNet shares change (top 50)
+328.0K
+3.91M / −3.59M
Net new holders
-3
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
DGX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
18
Buy transactions
1
Sell transactions
18.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Davis J. E. CEO and President | Jun 1, 2026 | Sale | 10,000 | $194.14 | $1.94M | 132.4K | Form 4 ↗ |
CARTER ROBERT B director | May 20, 2026 | Award | 1,142 | — | — | 3.9K | Form 4 ↗ |
Gregg Vicky B director | May 20, 2026 | Award | 1,142 | — | — | 18.3K | Form 4 ↗ |
Diaz Luis director | May 20, 2026 | Award | 1,142 | — | — | 5.2K | Form 4 ↗ |
MAIN TIMOTHY L director | May 20, 2026 | Award | 1,142 | — | — | 27.4K | Form 4 ↗ |
WENTWORTH TIMOTHY C director | May 20, 2026 | Award | 1,142 | — | — | 1.4K | Form 4 ↗ |
Doi Tracey director | May 20, 2026 | Award | 1,142 | — | — | 7.7K | Form 4 ↗ |
RING TIMOTHY M director | May 20, 2026 | Award | 1,142 | — | — | 31.1K | Form 4 ↗ |
Lassiter Wright III director | May 20, 2026 | Award | 1,142 | — | — | 10.3K | Form 4 ↗ |
MORRISON DENISE M director | May 20, 2026 | Award | 1,142 | — | — | 11.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Quest Diagnostics Incorporated (DGX) is primarily owned by institutional investors, who hold approximately 94.8% of total shares outstanding. Company insiders own approximately 0.49%, while retail and public investors account for the remaining 4.69%.
The largest institutional shareholder of Quest Diagnostics Incorporated is VANGUARD GROUP INC, holding approximately 14.25 million shares — equal to 12.72% of outstanding shares — as of September 30, 2025.
A total of 1,029 institutional investors currently hold DGX stock, with a combined institutional value of approximately $19.97 billion as of the most recent 13F filing period.
Frequently asked questions
DGX ownershipQuest Diagnostics Incorporated (DGX) is primarily owned by institutional investors, who hold approximately 94.8% of shares. The largest shareholder is VANGUARD GROUP INC with a 12.72% stake. Company insiders hold 0.49%. Data sourced from SEC Form 13F as of September 30, 2025.