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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+1.73%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
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
IDV icon
501
iShares International Select Dividend ETF
IDV
$8.53B
$5.41M 0.01%
137,239
+4,495
+3% +$170K
SCHB icon
502
Schwab US Broad Market ETF
SCHB
$44.8B
$5.39M 0.01%
205,511
-106,379
-34% -$2.77M
DXJ icon
503
WisdomTree Japan Hedged Equity Fund
DXJ
$7.43B
$5.3M 0.01%
36,759
+8,975
+32% +$1.23M
QQQM icon
504
Invesco NASDAQ 100 ETF
QQQM
$102B
$5.28M 0.01%
20,872
+2,141
+11% +$541K
BDX icon
505
Becton Dickinson
BDX
$48.9B
$5.25M 0.01%
27,056
-3,149
-10% -$599K
KDEC
506
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$73.3M
$5.24M 0.01%
205,082
+38,250
+23% +$976K
CTVA icon
507
Corteva
CTVA
$51B
$5.2M 0.01%
77,648
+651
+0.8% +$42.1K
CVS icon
508
CVS Health
CVS
$122B
$5.19M 0.01%
65,418
+2,009
+3% +$158K
GIS icon
509
General Mills
GIS
$19.9B
$5.19M 0.01%
111,585
-12,039
-10% -$572K
TIP icon
510
iShares TIPS Bond ETF
TIP
$14.7B
$5.12M 0.01%
46,579
-21,112
-31% -$2.34M
MGV icon
511
Vanguard Morningstar Mega Cap Value ETF
MGV
$13.6B
$5.07M 0.01%
35,950
+13,670
+61% +$1.9M
ATI icon
512
ATI
ATI
$31.1B
$5.06M 0.01%
44,102
+40,415
+1,096% +$3.94M
CSX icon
513
CSX Corp
CSX
$92.8B
$5.05M 0.01%
139,223
-16,264
-10% -$582K
KJAN icon
514
Innovator US Small Cap Power Buffer ETF January
KJAN
$327M
$5.03M 0.01%
121,505
+3,000
+3% +$123K
FSS icon
515
Federal Signal
FSS
$7.74B
$4.95M 0.01%
45,542
-2,801
-6% -$321K
CIGI icon
516
Colliers International
CIGI
$5.11B
$4.94M 0.01%
33,575
+19
+0.1% +$2.85K
VGK icon
517
Vanguard FTSE Europe ETF
VGK
$31B
$4.93M 0.01%
59,022
+3,112
+6% +$253K
AIR icon
518
AAR Corp
AIR
$5.74B
$4.93M 0.01%
59,575
-1,459
-2% -$121K
GL icon
519
Globe Life
GL
$14.2B
$4.93M 0.01%
35,220
+32,499
+1,194% +$4.4M
CP icon
520
Canadian Pacific Kansas City
CP
$79.6B
$4.9M 0.01%
66,528
+113
+0.2% +$8.32K
YUM icon
521
Yum! Brands
YUM
$39.7B
$4.88M 0.01%
32,283
+9
+0% +$1.33K
GXO icon
522
GXO Logistics
GXO
$5.4B
$4.83M 0.01%
91,791
-42
-0% -$2.21K
XLI icon
523
State Street Industrial Select Sector SPDR ETF
XLI
$34.5B
$4.83M 0.01%
31,131
-291
-0.9% -$44.8K
CFLT
524
DELISTED
Confluent
CFLT
$4.82M 0.01%
159,290
+15,164
+11% +$372K
SCHG icon
525
Schwab US Large-Cap Growth ETF
SCHG
$63B
$4.81M 0.01%
147,464
-58,544
-28% -$1.9M
19 20
21
22 23

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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.