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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
SHAK icon
401
Shake Shack
SHAK
$2.85B
$8.39M 0.02%
103,342
-1,410
-1% -$124K
EEM icon
402
iShares MSCI Emerging Markets ETF
EEM
$29.9B
$8.39M 0.02%
153,299
+40,944
+36% +$2.23M
EME icon
403
Emcor
EME
$36.1B
$8.37M 0.02%
13,685
+12,630
+1,197% +$8.18M
MELI icon
404
Mercado Libre
MELI
$92.7B
$8.34M 0.02%
4,139
+56
+1% +$118K
PHYS icon
405
Sprott Physical Gold
PHYS
$15.8B
$8.26M 0.02%
250,165
-7,191
-3% -$228K
HEFA icon
406
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.75B
$8.24M 0.02%
199,263
+13,276
+7% +$544K
RF icon
407
Regions Financial
RF
$26.7B
$8.2M 0.02%
302,698
+2,792
+0.9% +$71.3K
MDT icon
408
Medtronic
MDT
$114B
$8.1M 0.02%
84,354
+5,499
+7% +$534K
VCYT icon
409
Veracyte
VCYT
$3.72B
$8.07M 0.02%
191,703
+176,294
+1,144% +$7.11M
SNPS icon
410
Synopsys
SNPS
$79.4B
$8.04M 0.02%
17,114
-9,892
-37% -$4.39M
USB icon
411
US Bancorp
USB
$99.8B
$8.01M 0.02%
150,151
-1,740
-1% -$85.6K
VTWO icon
412
Vanguard Russell 2000 ETF
VTWO
$17.3B
$7.98M 0.02%
80,150
-4,421
-5% -$439K
VNOM icon
413
Viper Energy
VNOM
$15.2B
$7.97M 0.02%
206,346
-987
-0.5% -$37.4K
BP icon
414
BP
BP
$110B
$7.94M 0.02%
228,648
-6,353
-3% -$223K
SU icon
415
Suncor Energy
SU
$73.6B
$7.93M 0.02%
178,686
+52,373
+41% +$2.21M
UPS icon
416
United Parcel Service
UPS
$89B
$7.89M 0.02%
79,558
-16,565
-17% -$1.55M
XYL icon
417
Xylem
XYL
$28.3B
$7.77M 0.02%
57,086
-2,992
-5% -$430K
SNOW icon
418
Snowflake
SNOW
$116B
$7.77M 0.02%
35,417
+7,168
+25% +$1.75M
FDX icon
419
FedEx
FDX
$77B
$7.69M 0.02%
26,622
+809
+3% +$212K
IJAN icon
420
Innovator International Developed Power Buffer ETF January
IJAN
$263M
$7.66M 0.02%
211,963
+71,790
+51% +$2.56M
USMV icon
421
iShares MSCI USA Min Vol Factor ETF
USMV
$24.4B
$7.66M 0.02%
81,339
-1,846
-2% -$174K
OEF icon
422
iShares S&P 100 ETF
OEF
$20.5B
$7.61M 0.02%
22,190
-269
-1% -$91.4K
ULTA icon
423
Ulta Beauty
ULTA
$23.5B
$7.57M 0.02%
12,510
-863
-6% -$474K
CBZ icon
424
CBIZ
CBZ
$2.96B
$7.54M 0.02%
149,356
-203,356
-58% -$10.7M
SYM icon
425
Symbotic
SYM
$5.21B
$7.37M 0.02%
123,937
-3,701
-3% -$244K
15 16
17
18 19

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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.