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Quest Diagnostics
DGX

1,005 hedge funds and large institutions have $20B invested in Quest Diagnostics in 2025 Q3 according to their latest regulatory filings, with 114 funds opening new positions, 358 increasing their positions, 343 reducing their positions, and 82 closing their positions.

New
Increased
Maintained
Reduced
Closed

39% more first-time investments, than exits

New positions opened: 114 | Existing positions closed: 82

2% more funds holding

Funds holding: 990 → 1,005 (+15)

4% more repeat investments, than reductions

Existing positions increased: 358 | Existing positions reduced: 343

4% more capital invested

Capital invested by funds: $19.3B → $20B (+$680M)

2.39% less ownership

Funds ownership: 96.25% → 93.86% (-2.4%)

12% less call options, than puts

Call options by funds: $98.2M | Put options by funds: $112M

25% less funds holding in top 10

Funds holding in top 10: 4 → 3 (-1)

Holders
1,005
Holders Change
+15
Holders Change %
+1.52%
% of All Funds
13.19%
Holding in Top 10
3
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-25%
% of All Funds
0.04%
New
114
Increased
358
Reduced
343
Closed
82
Calls
$98.2M
Puts
$112M
Net Calls
-$13.7M
Net Calls Change
+$30.8M

Top Buyers

1
Boston Partners
Boston Partners
Massachusetts
+$177M
2
EIG
EdgePoint Investment Group
Ontario, Canada
+$151M
3
Pacer Advisors
Pacer Advisors
Pennsylvania
+$77M
4
Goldman Sachs
Goldman Sachs
New York
+$74.2M
5
Marshall Wace
Marshall Wace
United Kingdom
+$62.5M

Top Sellers

1
AllianceBernstein
AllianceBernstein
Tennessee
-$108M
2
Victory Capital Management
Victory Capital Management
Texas
-$82.6M
3
Royal Bank of Canada
Royal Bank of Canada
Ontario, Canada
-$73.8M
4
UBS AM
UBS AM
Illinois
-$55.9M
5
UBS Group
UBS Group
Switzerland
-$55.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
Citigroup
51
Citigroup
New York
$60.9M +$4.55M +25,666 +9%
Schroder Investment Management Group
52
Schroder Investment Management Group
United Kingdom
$59.4M -$6.98M -39,334 -11%
ACM
53
Advisors Capital Management
New Jersey
$56.7M +$2.53M +14,258 +5%
BNP Paribas Asset Management
54
BNP Paribas Asset Management
France
$54.2M -$1.4M -7,877 -3%
Sumitomo Mitsui Trust Group
55
Sumitomo Mitsui Trust Group
Japan
$53.1M +$630K +3,549 +1%
8KM
56
8 Knots Management
Texas
$52.5M +$17.5M +98,806 +56%
RhumbLine Advisers
57
RhumbLine Advisers
Massachusetts
$52.3M -$937K -5,282 -2%
Macquarie Group
58
Macquarie Group
Australia
$51.7M -$3.65M -20,565 -7%
Barclays
59
Barclays
United Kingdom
$47.9M -$18.7M -105,269 -30%
RI
60
RTW Investments
New York
$47.6M -$44.4M -250,000 -50%
National Pension Service
61
National Pension Service
South Korea
$44.8M +$1.37M +7,711 +3%
Mitsubishi UFJ Asset Management
62
Mitsubishi UFJ Asset Management
Japan
$42.8M +$1.47M +8,269 +4%
BNP Paribas Financial Markets
63
BNP Paribas Financial Markets
France
$42.2M -$4.55M -25,662 -10%
Balyasny Asset Management
64
Balyasny Asset Management
Illinois
$42.2M +$39.3M +221,503 New
BG
65
Bahl & Gaynor
Ohio
$41.3M -$11.4M -64,335 -23%
HSBC Holdings
66
HSBC Holdings
United Kingdom
$40.5M -$1.69M -9,519 -4%
Pictet Asset Management
67
Pictet Asset Management
Switzerland
$40M -$19.4M -109,543 -34%
Bank of Montreal
68
Bank of Montreal
Ontario, Canada
$38.6M +$114K +640 +0.3%
QCM
69
Quantinno Capital Management
New York
$36.9M +$25.2M +141,838 +274%
Universal-Beteiligungs- und Servicegesellschaft
70
Universal-Beteiligungs- und Servicegesellschaft
Germany
$35.7M -$2.02M -11,374 -6%
APG Asset Management
71
APG Asset Management
Netherlands
$34.5M -$2.11M -11,896 -5%
California State Teachers Retirement System (CalSTRS)
72
California State Teachers Retirement System (CalSTRS)
California
$32.9M -$2.88M -16,239 -9%
CCM
73
Copeland Capital Management
Pennsylvania
$32.1M -$1.4M -7,889 -4%
CPC
74
Cookson Peirce & Co
Pennsylvania
$31.2M -$1.07M -6,032 -4%
Skandinaviska Enskilda Banken (SEB)
75
Skandinaviska Enskilda Banken (SEB)
Sweden
$30.9M -$4.83M -27,243 -14%
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DGX Hedge Fund Activity: Q3 2025 in Review

1,005 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Quest Diagnostics (DGX) for Q3 2025, worth a combined $20B — up 3.5% from $19.3B a quarter earlier.

Buyers outnumbered sellers: 114 funds opened new DGX positions and 82 closed out — a net gain of 32 holders — while 358 added to existing stakes and 343 trimmed.

The largest buyer was Boston Partners, adding an estimated $177M. The largest seller was AllianceBernstein, cutting an estimated $108M.

  • 1,005 institutional investors held Quest Diagnostics (DGX) as of Q3 2025, up from 990 in Q2 2025.
  • Funds reported $20B of Quest Diagnostics stock for Q3 2025, up 3.5% quarter-over-quarter.
  • 114 funds opened new Quest Diagnostics positions in Q3 2025 and 82 closed out, a net change of +32 holders.
  • The largest Quest Diagnostics buyer in Q3 2025 was Boston Partners, an estimated $177M added.
  • The largest Quest Diagnostics seller in Q3 2025 was AllianceBernstein, an estimated $108M sold.

Based on aggregated 13F filings for Q3 2025.