Historical position

George Soros’s Quest Diagnostics Inc (DGX) position

Reported position history, portfolio importance and verified filing changes from public SEC disclosures.

Soros Fund ManagementVerified through Q2 2026
Relationship snapshot

At a glance

The full verified relationship, including prior ownership episodes and exits where supported.

First reportedQ1 2001Earliest verified positive filing snapshot
Latest statusHistorical positionBased on the latest supported relationship state
Peak shares369.50KHighest verified quarter-end share count
Quarters reported17Verified quarters with shares above zero
What happened?

Soros Fund Management first reported Quest Diagnostics Inc in Q1 2001. The reported position was increased and reduced across later filings. Verified positive position history runs through Q4 2009. The current relationship status cannot be determined reliably from supported data.

Verified SEC history

Position over time

See the same verified relationship through reported shares, portfolio weight or reported value.

Metric

Gaps indicate periods that cannot be safely connected or where a verified corporate action changes the raw share scale. Stock price, when available, is market context and not a transaction price.

Key filing events

What changed

Latest filing plus the most meaningful reported changes. Unchanged quarters are collapsed by default.

Q4 2009
Bought 97.6% more+4.00K shares · 8.10K shares reported after the change
Filing context

Quarter-end price $60.37 · Estimated holding basis $56.23

Q3 2009
New position+4.10K shares · 4.10K shares reported
Filing context

Quarter-end price $52.20 · Estimated holding basis $52.20

Q4 2007
Sold the entire position−369.50K shares · No shares reported at quarter-end
Q3 2007
Bought 269.6% more+269.53K shares · 369.50K shares reported after the change
Filing context

Quarter-end price $57.77 · Estimated holding basis $56.11

Q2 2007
New position+99.97K shares · 99.97K shares reported
Filing context

Quarter-end price $51.65 · Estimated holding basis $51.65

Q1 2007
Sold the entire position−80.40K shares · No shares reported at quarter-end

4 unchanged quarters are collapsed by default.

Portfolio importance

How important was Quest Diagnostics Inc in Soros Fund Management’s reported portfolio?

Relative importance is measured only within the verified primary non-option reported portfolio for each quarter.

Last reported portfolio weight0.0%Q4 2009
Last reported rank#372of 696 reported positions
Peak portfolio weight1.1%Q2 2003
Best historical rank#19Q2 2003
At peak importanceQ2 2003
DGX
1.1%
Largest holding
20.3%
Cross-investor discovery

Who else owns Quest Diagnostics Inc?

Also reported by 2 other tracked investors in their latest verified filings.

Joel GreenblattGotham Asset Management
DGX0.1% of reported portfolio
Ray DalioBridgewater Associates, LP
DGX0.0% of reported portfolio
Explore Quest Diagnostics Inc across all tracked investors →
SEC evidence & methodology

SEC filing evidence

Market context and filing-derived values are kept separate from actual transaction prices, which 13F filings do not disclose.

Latest verified stock price$247.082026-09-15

Market context only; not an investor transaction price.

Latest filing quarter-end price$60.37Q4 2009

Derived from validated reported value and shares where supported.

Estimated holding basis$56.23Historical reference — not actual purchase price

Calculated from supported filing history.

Latest verified investor filingQ2 2026 · filed 2026-08-14
Open SEC filing ↗

This tracker follows Soros Fund Management LLC’s Form 13F disclosures—not George Soros’s personal brokerage account. George Soros founded the firm; its current CEO and chief investment officer is Dawn Fitzpatrick. Form 13F does not reveal exact trade dates, execution prices or the purpose of an option position.