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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+1.73%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.3B
AUM Growth
-$310M
Cap. Flow
-$212M
Cap. Flow %
-0.57%
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96

Top Buys

Rank Stock Value
1
BWXT icon
BWX Technologies
BWXT
+$46.6M
2
META icon
Meta Platforms (Facebook)
META
+$38.3M
3
NOW icon
ServiceNow
NOW
+$37.6M
4
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$32.4M
5
GLD icon
SPDR Gold Trust
GLD
+$29.4M

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$114M
2
CSGP icon
CoStar Group
CSGP
+$78.3M
3
CWAN
Clearwater Analytics
CWAN
+$75.3M
4
POOL icon
Pool Corp
POOL
+$54M
5
ZTS icon
Zoetis
ZTS
+$51.3M

Sector Composition

Rank Sector Weight
1 Technology 25.8%
2 Financials 13.4%
3 Industrials 12.04%
4 Healthcare 11.22%
5 Communication Services 7.63%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VDC icon
651
Vanguard Consumer Staples ETF
VDC
$7.92B
$2.88M 0.01%
13,657
-61
-0.4% -$13K
PRU icon
652
Prudential Financial
PRU
$42.2B
$2.88M 0.01%
25,513
-2,579
-9% -$277K
DSI icon
653
iShares MSCI KLD 400 Social ETF
DSI
$5.54B
$2.88M 0.01%
22,348
-234
-1% -$29.9K
QNST icon
654
QuinStreet
QNST
$1.25B
$2.85M 0.01%
198,393
-19,741
-9% -$285K
HAL icon
655
Halliburton
HAL
$28.2B
$2.85M 0.01%
100,684
-5,371
-5% -$142K
A icon
656
Agilent Technologies
A
$42.2B
$2.82M 0.01%
20,721
-2,022
-9% -$291K
PPA icon
657
Invesco Aerospace & Defense ETF
PPA
$8.74B
$2.81M 0.01%
17,955
+916
+5% +$141K
ED icon
658
Consolidated Edison
ED
$39.4B
$2.81M 0.01%
28,287
-946
-3% -$93.9K
ODFL icon
659
Old Dominion Freight Line
ODFL
$43.9B
$2.8M 0.01%
17,859
-215
-1% -$30.8K
PDP icon
660
Invesco Dorsey Wright Momentum ETF
PDP
$1.5B
$2.78M 0.01%
23,915
-650
-3% -$76.6K
EL icon
661
Estee Lauder
EL
$31.9B
$2.78M 0.01%
26,513
+6,214
+31% +$603K
AZO icon
662
AutoZone
AZO
$50.4B
$2.77M 0.01%
816
-292
-26% -$1.1M
SOLS
663
Solstice Advanced Materials
SOLS
$9.76B
$2.77M 0.01%
+56,941
New +$2.68M
ACWI icon
664
iShares MSCI ACWI ETF
ACWI
$33.4B
$2.76M 0.01%
19,495
-590
-3% -$82.8K
CBRE icon
665
CBRE Group
CBRE
$42.7B
$2.75M 0.01%
17,129
+1,005
+6% +$158K
AIRG icon
666
Airgain
AIRG
$72.6M
$2.72M 0.01%
670,390
-46,017
-6% -$187K
KRMN
667
Karman Holdings
KRMN
$8.07B
$2.7M 0.01%
36,887
+5,605
+18% +$406K
SNA icon
668
Snap-on
SNA
$21.5B
$2.69M 0.01%
7,799
-42
-0.5% -$14.4K
ICLR icon
669
Icon
ICLR
$12.7B
$2.69M 0.01%
14,746
-9,264
-39% -$1.65M
BE icon
670
Bloom Energy
BE
$63B
$2.69M 0.01%
30,903
+7
+0% +$735
IONS icon
671
Ionis Pharmaceuticals
IONS
$9.44B
$2.67M 0.01%
33,788
-583
-2% -$43.9K
ELS icon
672
Equity Lifestyle Properties
ELS
$12.6B
$2.65M 0.01%
43,801
+1,171
+3% +$72.4K
CCI icon
673
Crown Castle
CCI
$31.5B
$2.64M 0.01%
29,690
-7,005
-19% -$644K
VGIT icon
674
Vanguard Intermediate-Term Treasury ETF
VGIT
$42.4B
$2.64M 0.01%
43,980
+3,237
+8% +$195K
VICI icon
675
VICI Properties
VICI
$28.7B
$2.63M 0.01%
93,434
+3,173
+4% +$94.3K
25 26
27
28 29

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William Blair & Company's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
  • William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
  • William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
  • William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
  • William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
  • William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
  • William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.

Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.