Who owns Quest Diagnostics (DGX)
Which tracked institutional funds hold DGX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See DGX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
315 tracked funds added or opened DGX while 139 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
DGX’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes DGX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in DGX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1038 tracked filers holding DGX, 521 increased or opened the position and 462 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in DGX between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 39
- PFA Pension, Forsikringsaktieselskab$44M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$23M
- Simplify Asset Management Inc.$11M
- Cornerstone Advisors, LLC$10M
- BRAIDWELL LP$9M
- EASTERLY INVESTMENT PARTNERS LLC$8M
Full exits 75
- DekaBank Deutsche Girozentrale$149M
- Pacer Advisors, Inc.$86M
- Amundi$80M
- CANADA LIFE ASSURANCE Co$60M
- ACADIAN ASSET MANAGEMENT LLC$47M
- SG Americas Securities, LLC$43M
Largest adds
- BlackRock, Inc.$538M
- Boston Partners$218M
- VANGUARD CAPITAL MANAGEMENT LLC$133M
- FMR LLC$118M
- STATE STREET CORP$115M
- VANGUARD PORTFOLIO MANAGEMENT LLC$108M
Largest trims
- PRICE T ROWE ASSOCIATES INC /MD/$80M
- Qube Research & Technologies Ltd$71M
- GOLDMAN SACHS GROUP INC$56M
- Squarepoint Ops LLC$43M
- CITADEL ADVISORS LLC$40M
- FIDUCIARY MANAGEMENT INC /WI/$39M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 9,275,411 | $2.0B | 10.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 7,233,394 | $1.5B | 7.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 6,131,045 | $1.3B | 6.7% | 2026-Q2 |
| STATE STREET CORP added | 5,516,643 | $1.2B | 6.0% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 5,444,986 | $1.2B | 6.0% | 2026-Q2 |
| Boston Partners added | 4,744,473 | $1.0B | 5.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 3,520,438 | $749M | 3.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,137,873 | $663M | 3.4% | 2026-Q2 |
| MORGAN STANLEY trimmed | 2,460,497 | $522M | 2.7% | 2026-Q2 |
| EdgePoint Investment Group Inc. added | 2,247,568 | $476M | 2.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,988,048 | $421M | 2.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 1,935,133 | $410M | 2.1% | 2026-Q2 |
| Grantham, Mayo, Van Otterloo & Co. LLC added | 1,888,207 | $400M | 2.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 1,751,220 | $371M | 1.9% | 2026-Q2 |
| DAVIS SELECTED ADVISERS trimmed | 1,555,612 | $330M | 1.7% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 1,550,556 | $329M | 1.7% | 2026-Q2 |
| NORGES BANK added | 1,406,620 | $298M | 1.5% | 2026-Q2 |
| FMR LLC added | 1,398,735 | $296M | 1.5% | 2026-Q2 |
| Invesco Ltd. trimmed | 1,379,115 | $292M | 1.5% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,127,454 | $239M | 1.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 982,694 | $208M | 1.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 942,407 | $200M | 1.0% | 2026-Q2 |
| UBS Group AG added | 888,906 | $188M | 1.0% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 818,220 | $173M | 0.9% | 2026-Q2 |
| M&G PLC trimmed | 795,650 | $169M | 0.9% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 773,711 | $164M | 0.8% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 759,975 | $161M | 0.8% | 2026-Q2 |
| Legal & General Group Plc trimmed | 717,085 | $152M | 0.8% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 629,339 | $133M | 0.7% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 625,894 | $123M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 621,639 | $132M | 0.7% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 585,895 | $124M | 0.6% | 2026-Q2 |
| Nuveen, LLC added | 563,830 | $120M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 517,225 | $110M | 0.6% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 505,762 | $107M | 0.6% | 2026-Q2 |
| Woodline Partners LP trimmed | 485,841 | $103M | 0.5% | 2026-Q2 |
| FIDUCIARY MANAGEMENT INC /WI/ trimmed | 483,557 | $102M | 0.5% | 2026-Q2 |
| Artemis Investment Management LLP added | 467,921 | $99M | 0.5% | 2026-Q2 |
| CRAWFORD INVESTMENT COUNSEL INC trimmed | 460,081 | $98M | 0.5% | 2026-Q2 |
| BARCLAYS PLC trimmed | 448,726 | $95M | 0.5% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 428,564 | $91M | 0.5% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 417,715 | $89M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 395,245 | $84M | 0.4% | 2026-Q2 |
| M.D. Sass, LLC added | 360,453 | $76M | 0.4% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 343,398 | $73M | 0.4% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 333,295 | $71M | 0.4% | 2026-Q2 |
| Advisors Capital Management, LLC added | 327,575 | $69M | 0.4% | 2026-Q2 |
| CITIGROUP INC added | 315,584 | $67M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 309,900 | $66M | 0.3% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 290,970 | $62M | 0.3% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 280,319 | $59M | 0.3% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 275,371 | $58M | 0.3% | 2026-Q2 |
| MARSHALL WACE, LLP added | 269,760 | $57M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 268,354 | $57M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 267,727 | $57M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 258,597 | $55M | 0.3% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 253,146 | $54M | 0.3% | 2026-Q2 |
| Quantinno Capital Management LP added | 252,924 | $54M | 0.3% | 2026-Q2 |
| FIL Ltd added | 251,976 | $53M | 0.3% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ added | 243,647 | $52M | 0.3% | 2026-Q2 |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. trimmed | 242,907 | $51M | 0.3% | 2026-Q2 |
| Clark Capital Management Group, Inc. added | 241,846 | $51M | 0.3% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 240,742 | $51M | 0.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 232,797 | $49M | 0.3% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 224,986 | $48M | 0.2% | 2026-Q2 |
| Eurizon Capital SGR S.p.A. trimmed | 222,564 | $47M | 0.2% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 219,613 | $47M | 0.2% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 211,496 | $45M | 0.2% | 2026-Q2 |
| PFA Pension, Forsikringsaktieselskab new | 205,613 | $44M | 0.2% | 2026-Q2 |
| Integral Health Asset Management, LLC added | 200,000 | $42M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System trimmed | 196,151 | $42M | 0.2% | 2026-Q2 |
| EASTERN BANK added | 189,969 | $40M | 0.2% | 2026-Q2 |
| CONNING INC. added | 186,734 | $40M | 0.2% | 2026-Q2 |
| SEB Asset Management AB added | 182,906 | $39M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 174,776 | $37M | 0.2% | 2026-Q2 |
| Focus Partners Wealth added | 163,327 | $35M | 0.2% | 2026-Q2 |
| STOREBRAND ASSET MANAGEMENT AS added | 160,970 | $34M | 0.2% | 2026-Q2 |
| COOKSON PEIRCE & CO INC trimmed | 155,589 | $33M | 0.2% | 2026-Q2 |
| CREDIT AGRICOLE S A added | 155,438 | $33M | 0.2% | 2026-Q2 |
| BRAUN STACEY ASSOCIATES INC trimmed | 154,396 | $33M | 0.2% | 2026-Q2 |
| Willis Investment Counsel trimmed | 151,500 | $32M | 0.2% | 2026-Q2 |
| APG Asset Management N.V. trimmed | 150,334 | $28M | 0.1% | 2026-Q2 |
| Copeland Capital Management, LLC trimmed | 144,784 | $31M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 143,079 | $30M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 133,211 | $28M | 0.1% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC added | 126,888 | $27M | 0.1% | 2026-Q2 |
| &PARTNERS added | 124,363 | $26M | 0.1% | 2026-Q2 |
| STIFEL FINANCIAL CORP added | 123,220 | $26M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 120,973 | $26M | 0.1% | 2026-Q2 |
| Candriam S.C.A. added | 120,238 | $25M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 117,831 | $25M | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC trimmed | 117,533 | $25M | 0.1% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ added | 117,005 | $25M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 116,373 | $25M | 0.1% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 115,921 | $25M | 0.1% | 2026-Q2 |
| Robeco Institutional Asset Management B.V. added | 112,546 | $24M | 0.1% | 2026-Q2 |
| AEGON ASSET MANAGEMENT UK Plc added | 107,888 | $23M | 0.1% | 2026-Q2 |
| TOCQUEVILLE ASSET MANAGEMENT L.P. trimmed | 106,964 | $23M | 0.1% | 2026-Q2 |
| Ceredex Value Advisors LLC added | 106,581 | $23M | 0.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 106,303 | $23M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.