# Quest Diagnostics Inc. (DGX) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 74834L100
Page URL: https://superinvestorclub.com/stock/DGX
Last updated: 2026-08-29T13:48:29.893Z

## Summary

As of the most recent 13F filing period, Quest Diagnostics Inc. (DGX) is held by 4 tracked superinvestors with an aggregate position value of $340.8M representing 0155561235800152123756 shares.

## Top institutional holders (4)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Christopher Davis](https://superinvestorclub.com/manager/75) | Davis Selected Advisers | 1555612 | $329.8M | 1.42% | 2026-06-30 |
| 2 | [Robert Olstein](https://superinvestorclub.com/manager/80) | Olstein Capital Management | 35800 | $7.0M | 1.53% | 2026-03-31 |
| 3 | [First Eagle](https://superinvestorclub.com/manager/21222) | First Eagle Investment Management | 15212 | $3.2M | 0.00% | 2026-06-30 |
| 4 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 3756 | $796,084 | 0.00% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2023-06-30: 1 holders, $515,996 aggregate, 03671 shares
- 2023-09-30: 2 holders, $203.7M aggregate, 016676983849 shares
- 2023-12-31: 2 holders, $368.2M aggregate, 026665643849 shares
- 2024-03-31: 3 holders, $343.8M aggregate, 023811631978013849 shares
- 2024-06-30: 4 holders, $356.7M aggregate, 02390828143718670004449 shares
- 2024-09-30: 4 holders, $395.6M aggregate, 0239910388739553184949 shares
- 2024-12-31: 4 holders, $373.9M aggregate, 0239726054216218904949 shares
- 2025-03-31: 5 holders, $438.1M aggregate, 0238830212040046000292685549 shares
- 2025-06-30: 4 holders, $252.2M aggregate, 013544204000056973771 shares
- 2025-09-30: 5 holders, $272.4M aggregate, 01361612400001817856463835 shares
- 2025-12-31: 5 holders, $288.3M aggregate, 01589883400002389539353518 shares
- 2026-03-31: 5 holders, $325.9M aggregate, 0161781335800347130002756 shares

## Recent congressional trades (11)

- 2025-11-03: Julie Johnson (Democrat-TX) sale $1,001 - $15,000
- 2025-10-30: Julie Johnson (Democrat-TX) purchase $1,001 - $15,000
- 2025-10-30: Julie Johnson (Democrat-TX) sale $1,001 - $15,000
- 2025-07-24: Julia Letlow (Republican-LA) sale $1,001 - $15,000
- 2025-04-28: Julia Letlow (Republican-LA) purchase $1,001 - $15,000
- 2025-03-10: Carol Devine Miller (R-WV) sale $1,001 - $15,000
- 2025-03-10: Carol Devine Miller (R-WV) sale $15,001 - $50,000
- 2025-03-10: Carol Miller (Republican-WV) sale $1,001 - $15,000
- 2025-01-24: Gil Cisneros (Democrat-CA) sale $1,001 - $15,000
- 2024-11-15: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2024-11-12: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "Quest Diagnostics Inc. (DGX) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/DGX), aggregating SEC 13F, Form 4, and congressional disclosures."