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 Mar 31, 2025
Ownership Breakdown
997
Institutional Holders
▲ 76 vs Q4
$17.51B
Total Inst. Value
▲ $2.53B vs Q4
110.70M
Shares Outstanding
freeFloat 99.51%
103.54M
13F Shares Held
▲ 4.18M vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC services-medical laboratories | 13.94M | 12.56% | 12.56% | $2.36T | May 9, 2025 | ▼ 23.7K |
BLACKROCK, INC. services-medical laboratories | 10.10M | 9.10% | 9.10% | $1.71T | May 2, 2025 | ▼ 27.4K |
PRICE T ROWE ASSOCIATES INC /MD/ services-medical laboratories | 5.98M | 5.39% | 5.39% | $1.01T | May 14, 2025 | ▲ 494.0K |
STATE STREET CORP services-medical laboratories | 5.18M | 4.66% | 4.66% | $875.92B | May 15, 2025 | ▼ 44.6K |
JPMORGAN CHASE & CO services-medical laboratories | 3.77M | 3.40% | 3.40% | $637.87B | May 12, 2025 | ▲ 1.34M |
VICTORY CAPITAL MANAGEMENT INC services-medical laboratories | 3.13M | 2.82% | 2.82% | $530.19B | May 2, 2025 | ▼ 226.5K |
GEODE CAPITAL MANAGEMENT, LLC services-medical laboratories | 2.77M | 2.50% | 2.50% | $467.86B | May 13, 2025 | ▲ 84.1K |
DAVIS SELECTED ADVISERS services-medical laboratories | 2.39M | 2.15% | 2.15% | $404.10B | May 12, 2025 | ▼ 9.0K |
BOSTON PARTNERS services-medical laboratories | 2.30M | 2.07% | 2.07% | $388.72B | May 13, 2025 | NEW |
GRANTHAM, MAYO, VAN OTTERLOO & CO. LLC services-medical laboratories | 2.01M | 1.81% | 1.81% | $339.51B | May 14, 2025 | ▼ 262.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
21
Increased
+4.82M shares2
New Positions
first time holders27
Decreased
−2.79M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.03M
+4.82M / −2.79M
Net new holders
-4
2 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 93.5% of total shares outstanding. Company insiders own approximately 0.49%, while retail and public investors account for the remaining 5.97%.
The largest institutional shareholder of Quest Diagnostics Incorporated is VANGUARD GROUP INC, holding approximately 13.94 million shares — equal to 12.56% of outstanding shares — as of March 31, 2025.
A total of 997 institutional investors currently hold DGX stock, with a combined institutional value of approximately $17.51 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 93.5% of shares. The largest shareholder is VANGUARD GROUP INC with a 12.56% stake. Company insiders hold 0.49%. Data sourced from SEC Form 13F as of March 31, 2025.