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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
DVN icon
251
Devon Energy
DVN
$49.3B
$18.3M 0.05%
499,650
+79,252
+19% +$2.77M
DGX icon
252
Quest Diagnostics
DGX
$26.2B
$17.9M 0.05%
103,375
+5,457
+6% +$994K
DIA icon
253
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$48.4B
$17.9M 0.05%
37,261
-1,150
-3% -$544K
XMTR icon
254
Xometry
XMTR
$5.25B
$17.7M 0.05%
298,189
-26,376
-8% -$1.49M
CGGR icon
255
Capital Group Growth ETF
CGGR
$25.1B
$17.7M 0.05%
398,534
+112,418
+39% +$4.96M
LMT icon
256
Lockheed Martin
LMT
$139B
$17.2M 0.05%
35,622
+75
+0.2% +$35.9K
HWM icon
257
Howmet Aerospace
HWM
$113B
$17.2M 0.05%
83,935
+6,797
+9% +$1.35M
PLMR icon
258
Palomar
PLMR
$3.41B
$17.2M 0.05%
127,421
+2,130
+2% +$260K
WST icon
259
West Pharmaceutical
WST
$25.1B
$17.1M 0.05%
62,316
-1,683
-3% -$460K
SOFI icon
260
SoFi Technologies
SOFI
$23.5B
$17.1M 0.05%
651,867
+28,081
+5% +$782K
CL icon
261
Colgate-Palmolive
CL
$74.2B
$17.1M 0.05%
215,951
-26,494
-11% -$2.08M
EQT icon
262
EQT Corp
EQT
$33.5B
$16.9M 0.05%
315,366
+232,841
+282% +$13.1M
EFX icon
263
Equifax
EFX
$21.4B
$16.8M 0.05%
77,258
-7,110
-8% -$1.56M
MCHP icon
264
Microchip Technology
MCHP
$44.3B
$16.7M 0.04%
262,559
+37,329
+17% +$2.3M
MKL icon
265
Markel Group
MKL
$22.9B
$16.6M 0.04%
7,707
+62
+0.8% +$126K
TMDX icon
266
Transmedics
TMDX
$3.03B
$16.5M 0.04%
135,889
+78,446
+137% +$9.84M
PAYX icon
267
Paychex
PAYX
$42.9B
$16.5M 0.04%
147,270
-8,165
-5% -$956K
NOVT icon
268
Novanta
NOVT
$6.18B
$16.5M 0.04%
138,418
+5,991
+5% +$682K
POCT icon
269
Innovator US Equity Power Buffer ETF October
POCT
$973M
$16.3M 0.04%
371,926
+336,218
+942% +$14.6M
KMI icon
270
Kinder Morgan
KMI
$69.3B
$16.3M 0.04%
593,771
+83,315
+16% +$2.25M
DOV icon
271
Dover
DOV
$28.3B
$16.3M 0.04%
83,546
+8,629
+12% +$1.57M
EQIX icon
272
Equinix
EQIX
$102B
$16.2M 0.04%
21,186
-1,042
-5% -$817K
CVNA icon
273
Carvana
CVNA
$79.7B
$16.2M 0.04%
191,565
-1,105
-0.6% -$82.2K
MOD icon
274
Modine Manufacturing
MOD
$10.3B
$16.2M 0.04%
121,069
+7,953
+7% +$1.18M
POOL icon
275
Pool Corp
POOL
$7.34B
$15.8M 0.04%
68,988
-207,737
-75% -$54M
9 10
11
12 13

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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.