Quest Diagnostics Inc
Held by 12 tracked managers as of Q2 2026 · CUSIP ⓘCUSIP: A 9-character ID for one specific security - one share class of one company, or one bond. Tickers can change and can mean different things in different countries; a CUSIP always identifies exactly the same security, which is why filings use it. Guide 74834L100 · Sector ⓘGICS sectors: The 11-sector system most investors know (Global Industry Classification Standard): Technology, Health Care, Financials and so on. This site assigns each company a GICS-style sector from its SIC code, with a few hand corrections, so sector pages match the names investors expect. Guide
In plain English: 12 of the investors we track own this stock. In the latest quarter, 5 of them bought more of it and 5 sold some or all of theirs (1 bought it for the first time). That tells you what they did last quarter — not what the stock will do next.
Educational and informational only, not personalized investment advice. Based on public filings that may be delayed or contain errors; verify with the original filings. Disclaimer
Managers holding
12
+1 vs last quarter (like-for-like)
Total value held
$2.08B
Across tracked managers
Average weight ⓘOn average, how big this stock is in the portfolios that own it (its share of each manager's reported portfolio value).
0.3%
Of each manager's book
QoQ value ⓘLike-for-like: only managers that filed both quarters are compared, so a manager filing late (or confidentially) does not look like buying or selling. Includes price changes.
+$192.86M
+12.2% vs last quarter
Net shares bought
+306.9K
Est. net flow +$64.89M
Quarter activity
5 bought · 5 sold
1 new · 0 sold out
Tracked capital in this stock
Total value held (area) and number of managers (line). Dips can mean a large holder filed that quarter confidentially (e.g. Norges Bank in Q1/Q3).
Aggregate buying and selling
Net share change reported each quarter
Who owns DGX?
Who added and who trimmed · Q2 2026
Estimated dollar change per manager (change in shares × this quarter's price). Click a bar to open the manager.
Who owns DGX? — Q2 2026
Holders ranked by position size, with each one's quarter-over-quarter change.
Column filters
| # | Manager | Fund | Shares | Value ↓ | % of their portfolio | QoQ | Δ shares | Δ shares % | Est. Δ value ⓘChange in shares × this quarter's price |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Boston Partners | Boston Partners Global Investors | 4.74M | $1.00B | 0.9% | Added | +732.2K | +18.3% | +$155.04M |
| 2 | Jeremy Grantham | GMO | 1.89M | $400.21M | 0.9% | Added | +5.2K | +0.3% | +$1.10M |
| 3 | Chris Davis | Davis Selected Advisers | 1.56M | $329.78M | 1.4% | Reduced | -62.2K | -3.8% | -$13.19M |
| 4 | Norges Bank | Norges Bank Investment Management | 1.41M | $298.13M | 0.0% | — | — | — | — |
| 5 | Ken Griffin | Citadel Advisors | 133.21K | $28.23M | 0.0% | Reduced | -214.0K | -61.6% | -$45.36M |
| 6 | Steve Cohen | Point72 Asset Management | 23.38K | $4.96M | 0.0% | New | +23.4K | — | +$4.96M |
| 7 | Wasatch Advisors | Wasatch Advisors LP | 16.77K | $3.56M | 0.0% | Reduced | -927 | -5.2% | -$196.48K |
| 8 | Israel Englander | Millennium Management | 11.43K | $2.42M | 0.0% | Reduced | -38.7K | -77.2% | -$8.21M |
| 9 | Matthew McLennan | First Eagle Investment Management | 7.61K | $1.61M | 0.0% | Added | +4.6K | +153.5% | +$976.24K |
| 10 | David Shaw | D.E. Shaw & Co. | 4.81K | $1.02M | 0.0% | Reduced | -142.9K | -96.7% | -$30.29M |
| 11 | Ray Dalio | Bridgewater Associates | 3.76K | $796.08K | 0.0% | Added | +285 | +8.2% | +$60.41K |
| 12 | First Wilshire | First Wilshire Securities Management | 2.35K | $498.08K | 0.1% | Held | 0 | 0.0% | $0 |
Column filters
No tracked manager sold out of this stock this quarter.
Politician trades
Column filters
| Politician | Date | Ticker | Asset | Type | Reported range ⓘThe dollar range the politician reported. Exact amounts are not disclosed. | Est. size ⓘOur estimate only: the midpoint of the reported range. | Owner | Account ⓘSubholding Of: the account the trade was in, as named on the report (e.g. an IRA or a brokerage account). The same stock bought on the same day in different accounts is a separate trade in each account. | Filed ↓ | Filing delay ⓘDays between the trade and the report. Over 45 days is late under the STOCK Act. | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ro Khanna Politician | Sep 4, 2026 | DGX | QUEST DIAGNOSTICS INCORPORATED cMN x scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Oct 7, 2026 | 33 days | PTR ↗ |
| Carol D. Miller Politician | Mar 10, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Sale | $15,001 - $50,000 | Est. $32,500 (midpoint of reported range $15,001–$50,000) | Spouse | United Bank Brokerage Account | Aug 13, 2026 | 521 days Late | PTR ↗ |
| Julie Johnson Politician | Oct 30, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Joint | — | Aug 5, 2026 | 279 days Late | PTR ↗ |
| Julie Johnson Politician | Oct 30, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Joint | Merrill Lynch Long Term Growth | Aug 5, 2026 | 279 days Late | PTR ↗ |
| Ro Khanna Politician | Jan 29, 2026 | DGX | QUEST DIAGNOSTICS INCORPORATED C scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2026 | 8 days | PTR ↗ |
| Julia Letlow Politician | Apr 28, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | Merrill Lynch Investment Account #025 | Jan 13, 2026 | 260 days Late | PTR ↗ |
| Julia Letlow Politician | Jul 24, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | Merrill Lynch Investment Account #025 | Jan 13, 2026 | 173 days Late | PTR ↗ |
| Julie Johnson Politician | Nov 3, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Joint | Merrill Lynch Long Term Growth | Dec 11, 2025 | 38 days | PTR ↗ |
| Carol D. Miller Politician | Mar 10, 2025 | DGX | Quest Diagnostics Incorporated Common Stock (DGX) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | Matt Miller Investment Management Account | Apr 11, 2025 | 32 days | PTR ↗ |
| Gil Cisneros Politician | Jan 24, 2025 | DGX | Quest Diagnostics Incorporated | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | — | Feb 11, 2025 | 18 days | PTR ↗ |
| Ro Khanna Politician | Jan 17, 2025 | DGX | QUEST DIAGNOSTICS INCORPORATED CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2025 | 20 days | PTR ↗ |
| Ro Khanna Politician | Dec 18, 2024 | DGX | QUEST DIAGNOSTICS INCORPORATED CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Jan 8, 2025 | 21 days | PTR ↗ |
| Ro Khanna Politician | Dec 16, 2024 | DGX | QUEST DIAGNOSTICS INCORPORATED CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Jan 8, 2025 | 23 days | PTR ↗ |
| Ro Khanna Politician | Nov 12, 2024 | DGX | QUEST DIAGNOSTICS INCORPORATED cMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Dec 5, 2024 | 23 days | PTR ↗ |