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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
SMG icon
476
ScottsMiracle-Gro
SMG
$3.63B
$5.92M 0.02%
101,434
-98,859
-49% -$5.55M
VCIT icon
477
Vanguard Intermediate-Term Corporate Bond ETF
VCIT
$67.5B
$5.9M 0.02%
70,450
+1,184
+2% +$99.5K
VIS icon
478
Vanguard Industrials ETF
VIS
$8.44B
$5.84M 0.02%
19,583
+1,486
+8% +$441K
FNV icon
479
Franco-Nevada
FNV
$46.5B
$5.84M 0.02%
28,165
+26,729
+1,861% +$5.42M
VT icon
480
Vanguard Total World Stock ETF
VT
$81.2B
$5.8M 0.02%
41,097
+6,647
+19% +$929K
ENB icon
481
Enbridge
ENB
$112B
$5.73M 0.02%
119,728
+4,025
+3% +$192K
DHI icon
482
D.R. Horton
DHI
$41B
$5.68M 0.02%
39,456
+100
+0.3% +$15.2K
QUAL icon
483
iShares MSCI USA Quality Factor ETF
QUAL
$48.1B
$5.68M 0.02%
28,609
+2,418
+9% +$475K
RGA icon
484
Reinsurance Group of America
RGA
$15.8B
$5.66M 0.02%
27,814
+25,946
+1,389% +$5.02M
CARR icon
485
Carrier Global
CARR
$52.3B
$5.58M 0.02%
105,672
-51,939
-33% -$2.89M
WELL icon
486
Welltower
WELL
$169B
$5.56M 0.01%
29,941
-1,837
-6% -$343K
TTE icon
487
TotalEnergies
TTE
$195B
$5.54M 0.01%
84,669
+3,977
+5% +$251K
FICO icon
488
Fair Isaac
FICO
$22.7B
$5.52M 0.01%
3,264
+95
+3% +$164K
SHY icon
489
iShares 1-3 Year Treasury Bond ETF
SHY
$25.5B
$5.49M 0.01%
66,246
+5,208
+9% +$432K
CRDF icon
490
Cardiff Oncology
CRDF
$80.1M
$5.48M 0.01%
1,948,847
-264,759
-12% -$615K
ROKU icon
491
Roku
ROKU
$22.5B
$5.47M 0.01%
50,448
+5,433
+12% +$551K
IGSB icon
492
iShares 1-5 Year Investment Grade Corporate Bond ETF
IGSB
$23.3B
$5.47M 0.01%
103,497
+19,234
+23% +$1.02M
LEU icon
493
Centrus Energy
LEU
$3.78B
$5.47M 0.01%
22,534
+3,978
+21% +$1.2M
ITA icon
494
iShares US Aerospace & Defense ETF
ITA
$15B
$5.46M 0.01%
25,449
-277
-1% -$58K
CIBR icon
495
First Trust NASDAQ Cybersecurity ETF
CIBR
$15.8B
$5.46M 0.01%
76,402
+8,334
+12% +$624K
UNF icon
496
Unifirst Corp
UNF
$5.24B
$5.46M 0.01%
28,292
+7,642
+37% +$1.29M
FND icon
497
Floor & Decor
FND
$6.3B
$5.46M 0.01%
89,627
-78,769
-47% -$5.11M
AEP icon
498
American Electric Power
AEP
$66.9B
$5.46M 0.01%
47,312
-267
-0.6% -$31.5K
RGLD icon
499
Royal Gold
RGLD
$19.8B
$5.45M 0.01%
24,528
-11
-0% -$2.18K
STKL
500
DELISTED
SunOpta
STKL
$5.42M 0.01%
1,426,995
-290,444
-17% -$1.32M
18 19
20
21 22

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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.