QUEST DIAGNOSTICS INC (DGX) Institutional Shareholders
QUEST DIAGNOSTICS INC (DGX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $21.95B in DGX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of DGX tracked by InsiderSet, reporting ownership valued at approximately $1.97B in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $2.30B, representing an estimated gain of +16.75% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 48% of the total disclosed DGX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in QUEST DIAGNOSTICS INC (DGX).
This page ranks the largest institutional DGX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
1,074
Total Reported Value
$21.95B
Largest Holder
Blackrock, Inc.
Largest Position
$1.97B
Insider Transactions (90d)
15
Latest Filing Quarter
Q2 2026
New Institutional Positions
60
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.03% | 9,275,411 | $1,965,923,399 | $2,295,200,452 | +$329,277,053 | +16.75% | |
| Vanguard Capital Management Llc | 0.03% | 7,233,394 | $1,533,117,858 | $1,789,903,345 | +$256,785,487 | +16.75% | |
| Vanguard Portfolio Management Llc | 0.06% | 6,131,045 | $1,299,474,988 | $1,517,127,085 | +$217,652,097 | +16.75% | |
| State Street Corp | 0.03% | 5,516,643 | $1,169,252,484 | $1,365,093,310 | +$195,840,826 | +16.75% | |
| Price T Rowe Associates Inc | 0.12% | 5,444,986 | $1,154,066,000 | $1,347,361,786 | +$193,295,786 | +16.75% | |
| Boston Partners | 0.89% | 4,744,473 | $1,004,552,880 | $1,174,019,844 | +$169,466,964 | +16.87% | |
| Jpmorgan Chase & Co | 0.04% | 3,520,438 | $748,586,197 | $871,132,383 | +$122,546,186 | +16.37% | |
| Geode Capital Management, Llc | 0.04% | 3,137,873 | $662,582,607 | $776,466,674 | +$113,884,067 | +17.19% | |
| Morgan Stanley | 0.03% | 2,460,497 | $521,503,271 | $608,849,983 | +$87,346,712 | +16.75% | |
| Edgepoint Investment Group Inc. | 3.60% | 2,247,568 | $476,372,038 | $556,160,702 | +$79,788,664 | +16.75% | |
| Dimensional Fund Advisors Lp | 0.08% | 1,988,048 | $421,376,156 | $491,942,478 | +$70,566,322 | +16.75% | |
| Bank Of America Corp | 0.03% | 1,935,133 | $410,151,497 | $478,848,661 | +$68,697,164 | +16.75% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.90% | 1,888,207 | $400,206,122 | $467,236,822 | +$67,030,700 | +16.75% | |
| Wells Fargo & Company/Mn | 0.06% | 1,751,220 | $371,171,119 | $433,339,389 | +$62,168,270 | +16.75% | |
| Davis Selected Advisers | 1.42% | 1,555,612 | $329,781,509 | $384,936,189 | +$55,154,680 | +16.72% | |
| Victory Capital Management Inc | 0.18% | 1,550,556 | $328,640,375 | $383,685,082 | +$55,044,707 | +16.75% | |
| Norges Bank | 0.03% | 1,406,620 | $298,133,109 | $348,068,119 | +$49,935,010 | +16.75% | |
| Fmr Llc | 0.01% | 1,398,735 | $296,462,102 | $346,116,976 | +$49,654,874 | +16.75% | |
| Invesco Ltd. | 0.02% | 1,379,115 | $292,303,423 | $341,262,007 | +$48,958,584 | +16.75% | |
| Northern Trust Corp | 0.03% | 1,127,454 | $238,963,873 | $278,988,492 | +$40,024,619 | +16.75% | |
| Goldman Sachs Group Inc | 0.02% | 982,694 | $208,282,052 | $243,167,630 | +$34,885,578 | +16.75% | |
| Ubs Group Ag | 0.03% | 888,906 | $188,403,627 | $219,959,790 | +$31,556,163 | +16.75% | |
| American Century Companies Inc | 0.08% | 818,220 | $173,422,135 | $202,468,539 | +$29,046,404 | +16.75% | |
| M&G Plc | 0.84% | 795,650 | $168,677,800 | $196,883,593 | +$28,205,793 | +16.72% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.03% | 846,603 | $165,917,256 | $209,491,912 | +$43,574,656 | +26.26% | |
| Charles Schwab Investment Management Inc | 0.02% | 773,711 | $163,988,047 | $191,454,787 | +$27,466,740 | +16.75% | |
| Ameriprise Financial Inc | 0.03% | 759,975 | $161,076,730 | $188,055,814 | +$26,979,084 | +16.75% | |
| Legal & General Group Plc | 0.03% | 717,085 | $151,986,161 | $177,442,683 | +$25,456,522 | +16.75% | |
| Dekabank Deutsche Girozentrale | 0.25% | 748,680 | $146,187,000 | $185,260,866 | +$39,073,866 | +26.73% | |
| Bank Of New York Mellon Corp | 0.02% | 629,339 | $133,388,337 | $155,729,936 | +$22,341,599 | +16.75% | |
| Vanguard Fiduciary Trust Co | 0.03% | 621,639 | $131,756,386 | $153,824,571 | +$22,068,185 | +16.75% | |
| Deutsche Bank Ag\ | 0.04% | 585,895 | $124,180,445 | $144,979,718 | +$20,799,273 | +16.75% | |
| Alliancebernstein L.P. | 0.04% | 625,894 | $122,662,706 | $154,877,470 | +$32,214,764 | +26.26% | |
| Nuveen, Llc | 0.03% | 563,830 | $119,503,667 | $139,519,734 | +$20,016,067 | +16.75% | |
| Principal Financial Group Inc | 0.05% | 517,225 | $109,630,811 | $127,987,326 | +$18,356,515 | +16.74% | |
| Raymond James Financial Inc | 0.03% | 505,762 | $107,196,222 | $125,150,807 | +$17,954,585 | +16.75% | |
| Woodline Partners Lp | 0.32% | 485,841 | $102,974,000 | $120,221,355 | +$17,247,355 | +16.75% | |
| Fiduciary Management Inc | 1.46% | 483,557 | $102,489,906 | $119,656,180 | +$17,166,274 | +16.75% | |
| Artemis Investment Management Llp | 0.88% | 467,921 | $99,175,856 | $115,787,051 | +$16,611,195 | +16.75% | |
| Crawford Investment Counsel Inc | 1.62% | 460,081 | $97,514,204 | $113,847,043 | +$16,332,839 | +16.75% | |
| Barclays Plc | 0.03% | 448,726 | $95,107,474 | $111,037,249 | +$15,929,775 | +16.75% | |
| Envestnet Asset Management Inc | 0.02% | 428,564 | $90,834,224 | $106,048,162 | +$15,213,938 | +16.75% | |
| Schroder Investment Management Group | 0.06% | 417,715 | $88,822,918 | $103,363,577 | +$14,540,659 | +16.37% | |
| Bnp Paribas Financial Markets | 0.04% | 395,245 | $83,772,178 | $97,803,375 | +$14,031,197 | +16.75% | |
| Pacer Advisors, Inc. | 0.21% | 381,995 | $80,964,000 | $94,524,663 | +$13,560,663 | +16.75% | |
| M.D. Sass, Llc | 5.06% | 360,453 | $76,397,960 | $89,194,095 | +$12,796,135 | +16.75% | |
| Acadian Asset Management Llc | 0.09% | 346,489 | $73,419,000 | $85,738,703 | +$12,319,703 | +16.78% | |
| Qube Research & Technologies Ltd | 0.08% | 343,398 | $72,783,206 | $84,973,835 | +$12,190,629 | +16.75% | |
| Mackenzie Financial Corp | 0.07% | 333,295 | $70,641,875 | $82,473,848 | +$11,831,973 | +16.75% | |
| Advisors Capital Management, Llc | 0.74% | 327,575 | $69,429,626 | $81,058,434 | +$11,628,808 | +16.75% |
Frequently asked questions about DGX
Who owns the most DGX stock?
The largest holders of DGX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for QUEST DIAGNOSTICS INC (DGX).
Is DGX widely held by superinvestors?
Many widely followed stocks like DGX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly DGX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.