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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+7.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
HWM icon
276
Howmet Aerospace
HWM
$112B
$15.1M 0.04%
77,138
-316
-0.4% -$57.6K
WCN
277
Waste Connections
WCN
$41.6B
$15M 0.04%
85,467
-1,781
-2% -$324K
CBOE icon
278
Cboe Global Markets
CBOE
$30.4B
$15M 0.04%
61,234
+1,385
+2% +$333K
APPF icon
279
AppFolio
APPF
$6.97B
$15M 0.04%
54,260
-2,077
-4% -$561K
DVN icon
280
Devon Energy
DVN
$49.3B
$14.7M 0.04%
420,398
+369,451
+725% +$12.6M
MIAX
281
Miami International Holdings
MIAX
$4.31B
$14.6M 0.04%
+363,765
New +$13.3M
PLMR icon
282
Palomar
PLMR
$3.36B
$14.6M 0.04%
125,291
-1,548
-1% -$196K
MKL icon
283
Markel Group
MKL
$22.8B
$14.6M 0.04%
7,645
-2,843
-27% -$5.57M
CVNA icon
284
Carvana
CVNA
$79.7B
$14.5M 0.04%
192,670
+11,830
+7% +$846K
MCHP icon
285
Microchip Technology
MCHP
$43.1B
$14.5M 0.04%
225,230
-6,855
-3% -$465K
KMI icon
286
Kinder Morgan
KMI
$70.7B
$14.5M 0.04%
510,456
-8,717
-2% -$239K
BKNG icon
287
Booking.com
BKNG
$159B
$14.4M 0.04%
66,675
-600
-0.9% -$134K
VOT icon
288
Vanguard Morningstar Mid-Cap Growth ETF
VOT
$20B
$14.3M 0.04%
48,606
-7,708
-14% -$2.22M
KMX icon
289
CarMax
KMX
$8.33B
$13.9M 0.04%
309,597
-82,324
-21% -$4.92M
SBAC icon
290
SBA Communications
SBAC
$19.4B
$13.9M 0.04%
71,772
-375
-0.5% -$81.2K
SMMD icon
291
iShares Russell 2500 ETF
SMMD
$3.75B
$13.8M 0.04%
186,991
-25,315
-12% -$1.8M
CB icon
292
Chubb
CB
$132B
$13.8M 0.04%
48,740
-3,138
-6% -$864K
TDUP icon
293
ThredUp
TDUP
$405M
$13.6M 0.04%
1,434,353
-1,210,692
-46% -$11.5M
MMM icon
294
3M
MMM
$94.8B
$13.5M 0.04%
87,284
-6,091
-7% -$939K
VNQ icon
295
Vanguard Real Estate ETF
VNQ
$38.6B
$13.4M 0.04%
146,504
-10,130
-6% -$919K
LNG icon
296
Cheniere Energy
LNG
$55.4B
$13.4M 0.04%
56,867
+4,342
+8% +$1.02M
SNPS icon
297
Synopsys
SNPS
$79B
$13.3M 0.04%
27,006
-269
-1% -$152K
LULU icon
298
lululemon athletica
LULU
$13.7B
$13.3M 0.04%
74,691
-72,576
-49% -$14.5M
NOVT icon
299
Novanta
NOVT
$6.32B
$13.3M 0.04%
132,427
-126,931
-49% -$15.1M
IWR icon
300
iShares Russell Mid-Cap ETF
IWR
$57.9B
$13.2M 0.04%
137,224
+193
+0.1% +$18.3K
10 11
12
13 14

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.