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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
ARCC icon
401
Ares Capital
ARCC
$13.4B
$7.87M 0.02%
436,676
+204,209
+88% +$3.95M
PPLT
402
abrdn Physical Platinum Shares ETF
PPLT
$1.83B
$7.86M 0.02%
441,020
+384,330
+678% +$7.69M
RF icon
403
Regions Financial
RF
$26.4B
$7.86M 0.02%
300,749
-1,949
-0.6% -$54.4K
GEHC icon
404
GE HealthCare
GEHC
$32.7B
$7.79M 0.02%
109,506
+5,026
+5% +$396K
SMG icon
405
ScottsMiracle-Gro
SMG
$4.09B
$7.78M 0.02%
127,959
+26,525
+26% +$1.72M
USB icon
406
US Bancorp
USB
$97.9B
$7.76M 0.02%
149,167
-984
-0.7% -$54.1K
QQQM icon
407
Invesco NASDAQ 100 ETF
QQQM
$93B
$7.63M 0.02%
32,118
+11,246
+54% +$2.81M
CIEN icon
408
Ciena
CIEN
$46.8B
$7.57M 0.02%
19,495
+922
+5% +$282K
POOL icon
409
Pool Corp
POOL
$7.05B
$7.54M 0.02%
37,268
-31,720
-46% -$7.48M
EVR icon
410
Evercore
EVR
$11.8B
$7.51M 0.02%
25,157
+12,039
+92% +$3.94M
KFY icon
411
Korn Ferry
KFY
$4.31B
$7.5M 0.02%
119,198
-34,336
-22% -$2.22M
HAL icon
412
Halliburton
HAL
$26.1B
$7.5M 0.02%
192,397
+91,713
+91% +$3.17M
LHX icon
413
L3Harris
LHX
$55.4B
$7.45M 0.02%
21,592
-256
-1% -$89.5K
MRSH
414
Marsh
MRSH
$94.3B
$7.43M 0.02%
40,642
+4,913
+14% +$883K
KJAN icon
415
Innovator US Small Cap Power Buffer ETF January
KJAN
$322M
$7.41M 0.02%
177,539
+56,034
+46% +$2.37M
VRTX icon
416
Vertex Pharmaceuticals
VRTX
$123B
$7.39M 0.02%
16,541
+451
+3% +$210K
ETR icon
417
Entergy
ETR
$50.3B
$7.38M 0.02%
65,687
+828
+1% +$83.3K
USMV icon
418
iShares MSCI USA Min Vol Factor ETF
USMV
$23.6B
$7.38M 0.02%
79,569
-1,770
-2% -$168K
SJM icon
419
J.M. Smucker
SJM
$13.5B
$7.34M 0.02%
76,111
+3,122
+4% +$327K
PRF icon
420
Invesco FTSE RAFI US 1000 ETF
PRF
$9.72B
$7.31M 0.02%
153,748
+14,164
+10% +$688K
UNF icon
421
Unifirst Corp
UNF
$5.45B
$7.12M 0.02%
28,312
+20
+0.1% +$4.61K
DT icon
422
Dynatrace
DT
$12.7B
$7.11M 0.02%
192,337
-80,376
-29% -$3.07M
TRMB icon
423
Trimble
TRMB
$13.6B
$7.06M 0.02%
108,306
-8,876
-8% -$617K
AEP icon
424
American Electric Power
AEP
$70.4B
$7.01M 0.02%
53,446
+6,134
+13% +$767K
COP icon
425
ConocoPhillips
COP
$144B
$7M 0.02%
53,028
+2,825
+6% +$313K
15 16
17
18 19

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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.