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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
ETN icon
201
Eaton
ETN
$150B
$28.8M 0.08%
80,604
-3,004
-4% -$1.07M
TWLO icon
202
Twilio
TWLO
$29.5B
$28.8M 0.08%
228,695
-7,298
-3% -$898K
AMLP icon
203
Alerian MLP ETF
AMLP
$12.9B
$28.2M 0.08%
534,883
+4,293
+0.8% +$219K
IEMG icon
204
iShares Core MSCI Emerging Markets ETF
IEMG
$147B
$28.1M 0.08%
402,463
+36,674
+10% +$2.65M
PJUL icon
205
Innovator US Equity Power Buffer ETF July
PJUL
$1.23B
$28.1M 0.08%
610,627
-23,579
-4% -$1.1M
VYM icon
206
Vanguard High Dividend Yield ETF
VYM
$81.9B
$27.4M 0.08%
184,699
+23,400
+15% +$3.52M
SU icon
207
Suncor Energy
SU
$75.4B
$27.2M 0.08%
412,174
+233,488
+131% +$12.9M
CMI icon
208
Cummins
CMI
$88.5B
$27.2M 0.08%
50,535
+455
+0.9% +$257K
SPXC icon
209
SPX Corp
SPXC
$10.2B
$27.2M 0.08%
135,942
-20,884
-13% -$4.49M
AMAT icon
210
Applied Materials
AMAT
$378B
$27.1M 0.08%
79,196
-214
-0.3% -$72K
XLF icon
211
State Street Financial Select Sector SPDR ETF
XLF
$57.4B
$27M 0.08%
546,632
-93,232
-15% -$4.86M
BSV icon
212
Vanguard Short-Term Bond ETF
BSV
$44.7B
$26.9M 0.08%
342,525
+10,372
+3% +$817K
SLV icon
213
iShares Silver Trust
SLV
$27.6B
$26.8M 0.08%
393,136
-8,388
-2% -$637K
ZBRA icon
214
Zebra Technologies
ZBRA
$13.5B
$26.1M 0.07%
124,860
+37,969
+44% +$8.92M
MIAX
215
Miami International Holdings
MIAX
$4.47B
$25.9M 0.07%
665,781
+10,936
+2% +$451K
MLM icon
216
Martin Marietta Materials
MLM
$35B
$25.8M 0.07%
43,837
+29,374
+203% +$18.7M
MS icon
217
Morgan Stanley
MS
$333B
$25.7M 0.07%
156,160
-553
-0.4% -$95.7K
BMY icon
218
Bristol-Myers Squibb
BMY
$130B
$25.3M 0.07%
417,659
+58,735
+16% +$3.42M
EW icon
219
Edwards Lifesciences
EW
$48.2B
$25.3M 0.07%
315,690
-29,110
-8% -$2.4M
DVY icon
220
iShares Select Dividend ETF
DVY
$24.1B
$25M 0.07%
165,348
+333
+0.2% +$50.3K
BOKF icon
221
BOK Financial
BOKF
$8.65B
$25M 0.07%
195,215
+33
+0% +$4.24K
PH icon
222
Parker-Hannifin
PH
$125B
$24.7M 0.07%
27,572
-5,896
-18% -$5.58M
SHW icon
223
Sherwin-Williams
SHW
$87.4B
$24.5M 0.07%
76,465
+4,873
+7% +$1.68M
PODD icon
224
Insulet
PODD
$11.6B
$23.6M 0.07%
112,604
-18,830
-14% -$4.73M
RGA icon
225
Reinsurance Group of America
RGA
$15.9B
$23.3M 0.07%
114,219
+86,405
+311% +$17.9M
7 8
9
10 11

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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.