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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
+606.62%
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 Miscellaneous 14.66%
3 Financials 13.4%
4 Industrials 12.04%
5 Healthcare 11.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SF
1076
Stifel
SF
$10.6B
$605K ﹤0.01%
7,250
+243
+3% +$19.4K
FXO icon
1077
First Trust Financials AlphaDEX Fund
FXO
$1.05B
$602K ﹤0.01%
9,980
-411
-4% -$24.2K
IEI icon
1078
iShares 3-7 Year Treasury Bond ETF
IEI
$17B
$601K ﹤0.01%
5,037
-134
-3% -$16K
GMED icon
1079
Globus Medical
GMED
$10B
$599K ﹤0.01%
6,860
-128
-2% -$9.71K
PWB icon
1080
Invesco Large Cap Growth ETF
PWB
$2.66B
$597K ﹤0.01%
4,700
+987
+27% +$125K
TXT icon
1081
Textron
TXT
$13.2B
$597K ﹤0.01%
6,844
+2,089
+44% +$175K
BBAX icon
1082
JPMorgan BetaBuilders Developed Asia Pacific-ex Japan ETF
BBAX
$6.58B
$597K ﹤0.01%
10,596
-1,520
-13% -$85.4K
GBDC icon
1083
Golub Capital BDC
GBDC
$3.24B
$595K ﹤0.01%
43,826
– –
IEX icon
1084
IDEX
IEX
$17B
$586K ﹤0.01%
3,293
-291
-8% -$49.7K
KRE icon
1085
State Street SPDR S&P Regional Banking ETF
KRE
$3.81B
$585K ﹤0.01%
9,020
-57,797
-87% -$3.63M
IHG icon
1086
InterContinental Hotels
IHG
$22.3B
$583K ﹤0.01%
+4,141
New +$538K
MDGL icon
1087
Madrigal Pharmaceuticals
MDGL
$11.9B
$582K ﹤0.01%
1,000
– –
FLYW icon
1088
Flywire
FLYW
$2.12B
$581K ﹤0.01%
+41,021
New +$562K
HSIC icon
1089
Henry Schein
HSIC
$9.63B
$579K ﹤0.01%
7,661
-628
-8% -$44.2K
RIVN icon
1090
Rivian
RIVN
$22.4B
$578K ﹤0.01%
29,336
-2,098
-7% -$33.3K
SYF icon
1091
Synchrony
SYF
$23.7B
$577K ﹤0.01%
6,911
+794
+13% +$60.7K
ITRN icon
1092
Ituran Location and Control
ITRN
$1.02B
$575K ﹤0.01%
13,376
+42
+0.3% +$1.65K
TWFG
1093
TWFG Inc
TWFG
$311M
$572K ﹤0.01%
19,896
-8,186
-29% -$223K
KGS icon
1094
Kodiak Gas Services
KGS
$5.35B
$570K ﹤0.01%
+15,235
New +$539K
VICR icon
1095
Vicor
VICR
$13B
$569K ﹤0.01%
5,191
+281
+6% +$23.9K
RVTY icon
1096
Revvity
RVTY
$16.9B
$569K ﹤0.01%
5,876
-1,825
-24% -$175K
SRPT icon
1097
Sarepta Therapeutics
SRPT
$1.97B
$567K ﹤0.01%
26,333
-7,299
-22% -$154K
PAA icon
1098
Plains All American Pipeline
PAA
$17.2B
$566K ﹤0.01%
31,505
– –
UYG icon
1099
ProShares Ultra Financials
UYG
$743M
$564K ﹤0.01%
6,140
– –
HUBG icon
1100
HUB Group
HUBG
$1.86B
$563K ﹤0.01%
13,205
-793
-6% -$30.1K
42 43
44
45 46

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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 Miscellaneous and Financials.

  • 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.