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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
TTAN
576
ServiceTitan Inc
TTAN
$8.03B
$3.64M 0.01%
57,348
+20,175
+54% +$1.56M
MEDP icon
577
Medpace
MEDP
$16.3B
$3.61M 0.01%
7,518
-482
-6% -$247K
SRE icon
578
Sempra
SRE
$58.1B
$3.6M 0.01%
37,040
+2,575
+7% +$236K
SLB icon
579
SLB Ltd
SLB
$72.7B
$3.6M 0.01%
70,032
+10,985
+19% +$533K
SPYG icon
580
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$49.4B
$3.6M 0.01%
36,748
+3,563
+11% +$371K
VHT icon
581
Vanguard Health Care ETF
VHT
$18.5B
$3.59M 0.01%
13,166
+949
+8% +$271K
SPG icon
582
Simon Property Group
SPG
$76.4B
$3.55M 0.01%
19,026
+2,629
+16% +$501K
AIRG icon
583
Airgain
AIRG
$71.1M
$3.55M 0.01%
644,985
-25,405
-4% -$116K
PMAR icon
584
Innovator US Equity Power Buffer ETF March
PMAR
$752M
$3.54M 0.01%
79,433
+43,538
+121% +$1.97M
CCJ icon
585
Cameco
CCJ
$36.8B
$3.53M 0.01%
32,528
-7,935
-20% -$908K
OKTA icon
586
Okta
OKTA
$23.8B
$3.5M 0.01%
44,427
-4,725
-10% -$392K
ODFL icon
587
Old Dominion Freight Line
ODFL
$46.3B
$3.47M 0.01%
17,773
-86
-0.5% -$16K
GCMG icon
588
GCM Grosvenor
GCMG
$737M
$3.47M 0.01%
354,306
-557,510
-61% -$6.18M
DD icon
589
DuPont de Nemours
DD
$18.6B
$3.47M 0.01%
25,251
+426
+2% +$58.8K
CIGI icon
590
Colliers International
CIGI
$5.17B
$3.46M 0.01%
32,353
-1,222
-4% -$152K
DELL icon
591
Dell
DELL
$239B
$3.44M 0.01%
20,968
+11,209
+115% +$1.49M
LEU icon
592
Centrus Energy
LEU
$3.14B
$3.41M 0.01%
19,651
-2,883
-13% -$695K
SOLS
593
Solstice Advanced Materials
SOLS
$8.84B
$3.41M 0.01%
44,723
-12,218
-21% -$837K
AKAM icon
594
Akamai
AKAM
$15.6B
$3.4M 0.01%
29,630
-148
-0.5% -$14.8K
IFRA icon
595
iShares US Infrastructure ETF
IFRA
$4.45B
$3.39M 0.01%
59,324
+52,618
+785% +$3.03M
NGNE icon
596
Neurogene
NGNE
$672M
$3.39M 0.01%
168,218
+4,563
+3% +$88.4K
KAPR icon
597
Innovator US Small Cap Power Buffer ETF April
KAPR
$213M
$3.36M 0.01%
92,770
-1,402
-1% -$50K
DKS icon
598
Dick's Sporting Goods
DKS
$18.4B
$3.35M 0.01%
16,902
-563
-3% -$114K
OSW icon
599
OneSpaWorld
OSW
$2.64B
$3.34M 0.01%
145,390
-5,862
-4% -$125K
IMCG icon
600
iShares Morningstar Mid-Cap Growth ETF
IMCG
$3.88B
$3.33M 0.01%
42,294
+15,751
+59% +$1.29M
22 23
24
25 26

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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.