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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
+7.16%
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
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
POCT icon
801
Innovator US Equity Power Buffer ETF October
POCT
$975M
$1.54M ﹤0.01%
35,708
-390
-1% -$16.5K
NTR icon
802
Nutrien
NTR
$32.2B
$1.54M ﹤0.01%
26,156
-903
-3% -$52.6K
FSLR icon
803
First Solar
FSLR
$24B
$1.53M ﹤0.01%
6,915
-681
-9% -$131K
RHI icon
804
Robert Half
RHI
$4.48B
$1.52M ﹤0.01%
44,878
-15,042
-25% -$564K
ASTS icon
805
AST SpaceMobile
ASTS
$21.4B
$1.51M ﹤0.01%
30,848
+4,521
+17% +$218K
VONG icon
806
Vanguard Russell 1000 Growth ETF
VONG
$46.2B
$1.51M ﹤0.01%
12,524
-53
-0.4% -$6.07K
PFF icon
807
iShares Preferred and Income Securities ETF
PFF
$13.3B
$1.51M ﹤0.01%
47,617
+10,952
+30% +$344K
SPSB icon
808
State Street SPDR Portfolio Short Term Corporate Bond ETF
SPSB
$10.8B
$1.5M ﹤0.01%
49,492
+2,825
+6% +$85.2K
BBEU icon
809
JPMorgan BetaBuilders Europe ETF
BBEU
$9.53B
$1.5M ﹤0.01%
21,516
-4,686
-18% -$319K
XLP icon
810
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.9B
$1.49M ﹤0.01%
19,012
-2,666
-12% -$215K
HUBB icon
811
Hubbell
HUBB
$26.8B
$1.49M ﹤0.01%
3,460
-18,582
-84% -$8M
EXP icon
812
Eagle Materials
EXP
$6.41B
$1.49M ﹤0.01%
6,376
-215
-3% -$48.7K
LGND icon
813
Ligand Pharmaceuticals
LGND
$5.76B
$1.49M ﹤0.01%
8,386
+685
+9% +$102K
IJT icon
814
iShares S&P Small-Cap 600 Growth ETF
IJT
$8.43B
$1.48M ﹤0.01%
10,475
-166
-2% -$22.9K
DTE icon
815
DTE Energy
DTE
$29B
$1.48M ﹤0.01%
10,475
-25
-0.2% -$3.42K
DELL icon
816
Dell
DELL
$320B
$1.48M ﹤0.01%
10,437
-1,519
-13% -$197K
ORI icon
817
Old Republic International
ORI
$10.3B
$1.47M ﹤0.01%
34,707
+1,280
+4% +$49.4K
JBL icon
818
Jabil
JBL
$38.8B
$1.47M ﹤0.01%
6,784
+420
+7% +$91.5K
GRMN
819
Garmin
GRMN
$60.2B
$1.47M ﹤0.01%
5,970
+1,397
+31% +$322K
FLOT icon
820
iShares Floating Rate Bond ETF
FLOT
$10.5B
$1.47M ﹤0.01%
28,740
+403
+1% +$20.5K
FLEX icon
821
Flex
FLEX
$45.9B
$1.46M ﹤0.01%
25,256
+2,878
+13% +$153K
MLI icon
822
Mueller Industries
MLI
$14.7B
$1.46M ﹤0.01%
28,928
+2,362
+9% +$108K
ADPT icon
823
Adaptive Biotechnologies
ADPT
$3.89B
$1.46M ﹤0.01%
97,537
+86,288
+767% +$1.05M
SPLV icon
824
Invesco S&P 500 Low Volatility ETF
SPLV
$7.22B
$1.45M ﹤0.01%
19,777
-538
-3% -$39.3K
QDEF icon
825
FlexShares Quality Dividend Defensive Index Fund
QDEF
$564M
$1.44M ﹤0.01%
18,039
+56
+0.3% +$4.32K
31 32
33
34 35

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

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

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.