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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
GBTC icon
426
Grayscale Bitcoin Trust
GBTC
$9.61B
$7.34M 0.02%
107,329
-228
-0.2% -$17.9K
LRCX icon
427
Lam Research
LRCX
$383B
$7.3M 0.02%
42,636
-12,770
-23% -$1.99M
VRTX icon
428
Vertex Pharmaceuticals
VRTX
$133B
$7.29M 0.02%
16,090
-1,900
-11% -$819K
FERG icon
429
Ferguson
FERG
$51.2B
$7.28M 0.02%
32,683
-645
-2% -$154K
MTD icon
430
Mettler-Toledo International
MTD
$28.6B
$7.28M 0.02%
5,218
+4,324
+484% +$6.04M
VCSH icon
431
Vanguard Short-Term Corporate Bond ETF
VCSH
$44.9B
$7.23M 0.02%
90,675
+65,219
+256% +$5.2M
SNEX icon
432
StoneX
SNEX
$7.81B
$7.22M 0.02%
170,881
+5,074
+3% +$213K
VOOV icon
433
Vanguard S&P 500 Value ETF
VOOV
$6.76B
$7.22M 0.02%
35,239
+3,425
+11% +$694K
OPRX icon
434
OptimizeRx
OPRX
$129M
$7.14M 0.02%
582,585
-8,554
-1% -$140K
SJM icon
435
J.M. Smucker
SJM
$12.6B
$7.14M 0.02%
72,989
+46,757
+178% +$4.83M
IGM icon
436
iShares Expanded Tech Sector ETF
IGM
$10.8B
$7.09M 0.02%
54,919
+49,532
+919% +$6.42M
HSY icon
437
Hershey
HSY
$36.7B
$7.06M 0.02%
38,814
+287
+0.7% +$52.5K
TRV icon
438
Travelers Companies
TRV
$78.3B
$6.99M 0.02%
24,086
-6,151
-20% -$1.73M
BR icon
439
Broadridge
BR
$19.8B
$6.95M 0.02%
31,148
-2,272
-7% -$518K
FVD icon
440
First Trust Value Line Dividend Fund
FVD
$8.35B
$6.84M 0.02%
148,526
-63,074
-30% -$2.9M
IHI icon
441
iShares US Medical Devices ETF
IHI
$3.44B
$6.83M 0.02%
109,850
-435
-0.4% -$26.9K
UCB
442
United Community Banks
UCB
$4.27B
$6.8M 0.02%
217,693
-37
-0% -$1.14K
NUE icon
443
Nucor
NUE
$62.5B
$6.77M 0.02%
41,487
+360
+0.9% +$54.1K
J icon
444
Jacobs Solutions
J
$17.2B
$6.75M 0.02%
50,965
+1,772
+4% +$260K
TPL icon
445
Texas Pacific Land
TPL
$24.2B
$6.74M 0.02%
23,471
+2
+0% +$611
WAY
446
Waystar Holding Corp
WAY
$4.74B
$6.71M 0.02%
204,868
+62,995
+44% +$2.24M
CGUS icon
447
Capital Group Core Equity ETF
CGUS
$11.9B
$6.7M 0.02%
166,437
+5,003
+3% +$200K
COR icon
448
Cencora
COR
$62B
$6.63M 0.02%
19,636
-1,483
-7% -$506K
MRSH
449
Marsh
MRSH
$91B
$6.63M 0.02%
35,729
-10,870
-23% -$2.03M
PRCT icon
450
Procept Biorobotics
PRCT
$1.24B
$6.61M 0.02%
210,266
-456,176
-68% -$15.1M
16 17
18
19 20

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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.