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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
TSCO icon
451
Tractor Supply
TSCO
$18B
$6.56M 0.02%
131,196
-24,579
-16% -$1.32M
PRF icon
452
Invesco FTSE RAFI US 1000 ETF
PRF
$10B
$6.55M 0.02%
139,584
+4,430
+3% +$204K
KRNT icon
453
Kornit Digital
KRNT
$778M
$6.53M 0.02%
454,428
-19,999
-4% -$274K
BOTZ icon
454
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.55B
$6.45M 0.02%
177,950
+6,712
+4% +$243K
LHX icon
455
L3Harris
LHX
$54B
$6.41M 0.02%
21,848
+3,013
+16% +$871K
XMMO icon
456
Invesco S&P MidCap Momentum ETF
XMMO
$7.52B
$6.41M 0.02%
46,314
+45
+0.1% +$6.15K
MET icon
457
MetLife
MET
$61.7B
$6.4M 0.02%
81,108
+2,225
+3% +$176K
SCHX icon
458
Schwab US Large- Cap ETF
SCHX
$74.6B
$6.38M 0.02%
237,237
+7,804
+3% +$208K
VLO icon
459
Valero Energy
VLO
$90.7B
$6.38M 0.02%
39,173
-3,661
-9% -$620K
QLYS icon
460
Qualys
QLYS
$6.43B
$6.37M 0.02%
47,958
+695
+1% +$95.6K
TEAM icon
461
Atlassian
TEAM
$38.5B
$6.29M 0.02%
38,807
-3,209
-8% -$504K
PBH icon
462
Prestige Consumer Healthcare
PBH
$2.51B
$6.28M 0.02%
101,848
-12,711
-11% -$778K
DGRO icon
463
iShares Core Dividend Growth ETF
DGRO
$43.7B
$6.22M 0.02%
89,582
+6,887
+8% +$474K
AMP icon
464
Ameriprise Financial
AMP
$49.2B
$6.18M 0.02%
12,608
+283
+2% +$134K
DOCS icon
465
Doximity
DOCS
$4.57B
$6.17M 0.02%
139,269
-223,471
-62% -$12.5M
BCPC
466
Balchem Corp
BCPC
$5.65B
$6.14M 0.02%
40,046
+37,137
+1,277% +$5.67M
MRCY icon
467
Mercury Systems
MRCY
$6.52B
$6.12M 0.02%
83,772
+3,252
+4% +$242K
IWP icon
468
iShares Russell Mid-Cap Growth ETF
IWP
$20.7B
$6.1M 0.02%
44,520
-2,778
-6% -$388K
XLU icon
469
State Street Utilities Select Sector SPDR ETF
XLU
$22.4B
$6.1M 0.02%
142,786
+8,950
+7% +$396K
U icon
470
Unity
U
$19B
$6.07M 0.02%
137,366
-5,718
-4% -$233K
IYW icon
471
iShares US Technology ETF
IYW
$25.3B
$6.05M 0.02%
30,300
-1,187
-4% -$237K
NOBL icon
472
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.9B
$6.04M 0.02%
116,014
+2,748
+2% +$142K
ETR icon
473
Entergy
ETR
$49.3B
$5.99M 0.02%
64,859
+3,067
+5% +$291K
GDYN icon
474
Grid Dynamics Holdings
GDYN
$621M
$5.94M 0.02%
657,332
-121,872
-16% -$1.06M
URI icon
475
United Rentals
URI
$70.8B
$5.93M 0.02%
7,332
+96
+1% +$83.3K
17 18
19
20 21

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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.