# 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: 2026-07-08T12:26:12.796Z

## Summary

As of the most recent 13F filing period, Quest Diagnostics Inc. (DGX) is held by 3 tracked superinvestors with an aggregate position value of $318.3M representing 0161781334712756 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Christopher Davis](https://superinvestorclub.com/manager/75) | Davis Selected Advisers | 1617813 | $317.1M | 1.46% | 2026-03-31 |
| 2 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 3471 | $680,247 | 0.00% | 2026-03-31 |
| 3 | [Lee Ainslie](https://superinvestorclub.com/manager/58) | Maverick Capital | 2756 | $540,121 | 0.01% | 2026-03-31 |

## Ownership history (quarter-over-quarter)

- 2024-03-31: 1 holders, $26.3M aggregate, 0197801 shares
- 2024-06-30: 3 holders, $356.1M aggregate, 0239082814371867000 shares
- 2024-09-30: 3 holders, $394.8M aggregate, 023991038873955318 shares
- 2024-12-31: 3 holders, $373.1M aggregate, 023972605421621890 shares
- 2025-03-31: 4 holders, $437.2M aggregate, 023883021204004600029268 shares
- 2025-06-30: 3 holders, $251.2M aggregate, 01354420400003771 shares
- 2025-09-30: 4 holders, $271.7M aggregate, 0136161240000181785646 shares
- 2025-12-31: 4 holders, $287.6M aggregate, 0158988340000238953518 shares
- 2026-03-31: 4 holders, $318.3M aggregate, 016178133471275635800 shares

## Recent congressional trades (7)

- 2025-11-03: 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 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."