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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
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
STWD icon
326
Starwood Property Trust
STWD
$6.15B
$11.6M 0.03%
672,416
-2,046
-0.3% -$36.7K
VNQ icon
327
Vanguard Real Estate ETF
VNQ
$39.9B
$11.6M 0.03%
130,414
-4,046
-3% -$371K
IJUL icon
328
Innovator International Developed Power Buffer ETF July
IJUL
$240M
$11.5M 0.03%
341,024
– –
MMM icon
329
3M
MMM
$92.5B
$11.4M 0.03%
78,750
-4,156
-5% -$662K
PNC icon
330
PNC Financial Services
PNC
$99.4B
$11.3M 0.03%
54,490
-241
-0.4% -$52.5K
SBAC icon
331
SBA Communications
SBAC
$18.9B
$11.3M 0.03%
65,652
-2,559
-4% -$480K
ABNB icon
332
Airbnb
ABNB
$91.9B
$11.2M 0.03%
88,840
-3,868
-4% -$503K
CVNA icon
333
Carvana
CVNA
$48.9B
$11.1M 0.03%
176,200
-15,365
-8% -$1.14M
TPL icon
334
Texas Pacific Land
TPL
$27B
$11M 0.03%
23,264
-207
-0.9% -$89K
ARES icon
335
Ares Management
ARES
$28.2B
$11M 0.03%
101,135
-21,800
-18% -$2.89M
AVY icon
336
Avery Dennison
AVY
$12.8B
$10.9M 0.03%
63,251
+39,811
+170% +$7.31M
BABA icon
337
Alibaba
BABA
$278B
$10.8M 0.03%
86,167
-43,863
-34% -$6.59M
MAR icon
338
Marriott International
MAR
$100B
$10.8M 0.03%
33,035
+80
+0.2% +$26.3K
BROS icon
339
Dutch Bros
BROS
$9.08B
$10.8M 0.03%
212,318
+42,546
+25% +$2.33M
ET icon
340
Energy Transfer Partners
ET
$69.3B
$10.6M 0.03%
547,059
-606
-0.1% -$11.1K
EME icon
341
Emcor
EME
$30.3B
$10.5M 0.03%
14,256
+571
+4% +$416K
SGOV icon
342
iShares 0-3 Month Treasury Bond ETF
SGOV
$99.4B
$10.5M 0.03%
103,850
+102,470
+7,425% +$10.3M
IWN icon
343
iShares Russell 2000 Value ETF
IWN
$14.5B
$10.4M 0.03%
54,781
+81
+0.1% +$15.7K
XBI icon
344
State Street SPDR S&P Biotech ETF
XBI
$10.1B
$10.4M 0.03%
81,152
-21,715
-21% -$2.71M
FDX icon
345
FedEx
FDX
$73.5B
$10.3M 0.03%
29,034
+2,412
+9% +$837K
CI icon
346
Cigna
CI
$78.5B
$10.3M 0.03%
38,591
-1,406
-4% -$389K
TEL icon
347
TE Connectivity
TEL
$60.5B
$10.2M 0.03%
48,572
+178
+0.4% +$39.3K
MEC icon
348
Mayville Engineering Co
MEC
$665M
$10.1M 0.03%
565,300
-18,459
-3% -$355K
VLO icon
349
Valero Energy
VLO
$89.8B
$10.1M 0.03%
40,743
+1,570
+4% +$324K
MPC icon
350
Marathon Petroleum
MPC
$90B
$10M 0.03%
41,132
-13,217
-24% -$2.67M
12 13
14
15 16

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.