Quest Diagnostics Inc
DGX · US
Quest Diagnostics Inc is held by 4 of the 24 tracked investors in their latest 13F filings. The largest position is Norges Bank's at $298M, 0.03% of that portfolio. Versus the prior quarter, 2 added, 2 trimmed and 0 bought new. In the last 90 days insiders sold 1 times ($2.4M) and bought 0 times on the open market.
Big investors holding this stock
Latest 13F of the 24 tracked investors. Common shares only.
| Investor | Value ($) | vs prior quarter |
|---|---|---|
| Norges Bank weight 0.03% · Q2 2026 |
298M | ▲ 6% |
| Korea Investment Corporation weight 0.02% · Q2 2026 |
9.9M | ▼ 12% |
| National Pension Service (Korea) weight 0.01% · Q2 2026 |
9.8M | ▼ 2% |
| Bridgewater Associates weight 0.00% · Q2 2026 |
0.8M | ▲ 8% |
Insider trades (90 days)
SEC Form 4| Insider | Trade | Amount ($) |
|---|---|---|
| Davis J. E. CEO · 9/1 |
Sell Plan | 2.4M |
Questions
Which big investors own Quest Diagnostics Inc?
Norges Bank ($298M), Korea Investment Corporation ($9.9M), National Pension Service (Korea) ($9.8M), Bridgewater Associates ($796,084), per their latest 13F filings.
Does Warren Buffett own Quest Diagnostics Inc?
Berkshire Hathaway did not report it in its latest 13F.
Does Korea's National Pension Service own Quest Diagnostics Inc?
Yes, $9.8M as of 2026-06-30 (0.01% of its US holdings).
Have Quest Diagnostics Inc insiders been selling?
1 open-market sales ($2.4M) and 0 purchases in the last 90 days; 1 of the sales were under pre-arranged 10b5-1 plans.
Restated and computed from SEC (13F, 13D/G, Form 4) and DART filings and NPS public data. Filings describe a past date and may differ from current holdings (13F: quarter end, up to 45 days later). Not investment advice.
Sources: SEC EDGAR, DART, data.go.kr (NPS), OpenFIGI. See Methodology for how figures are computed.