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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
XLI icon
501
State Street Industrial Select Sector SPDR ETF
XLI
$32.2B
$5.13M 0.01%
31,732
+601
+2% +$101K
HDV
502
iShares Core High Dividend ETF
HDV
$14.7B
$5.13M 0.01%
188,845
-4,725
-2% -$126K
TIP icon
503
iShares TIPS Bond ETF
TIP
$14.5B
$5.12M 0.01%
46,413
-166
-0.4% -$18.4K
VOOV icon
504
Vanguard S&P 500 Value ETF
VOOV
$6.61B
$5.05M 0.01%
24,796
-10,443
-30% -$2.19M
SCHB icon
505
Schwab US Broad Market ETF
SCHB
$42.3B
$5.03M 0.01%
200,538
-4,973
-2% -$130K
SPEM icon
506
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$16.7B
$5.01M 0.01%
106,871
+22,416
+27% +$1.09M
TW icon
507
Tradeweb Markets
TW
$23B
$5M 0.01%
42,486
-92,547
-69% -$10.6M
TGT icon
508
Target
TGT
$66.3B
$4.98M 0.01%
41,091
+9,560
+30% +$1.08M
SCHI icon
509
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.5B
$4.96M 0.01%
218,744
-174,897
-44% -$4.01M
CIBR icon
510
First Trust NASDAQ Cybersecurity ETF
CIBR
$13.9B
$4.93M 0.01%
78,663
+2,261
+3% +$152K
FIS icon
511
Fidelity National Information Services
FIS
$24.2B
$4.82M 0.01%
102,688
-94,222
-48% -$5.07M
BNY
512
Bank of New York Mellon
BNY
$103B
$4.8M 0.01%
40,491
+352
+0.9% +$41.9K
SCHF icon
513
Schwab International Equity ETF
SCHF
$64.9B
$4.79M 0.01%
193,508
+18,361
+10% +$467K
TTEK icon
514
Tetra Tech
TTEK
$8.77B
$4.77M 0.01%
158,442
+34,925
+28% +$1.23M
YUM icon
515
Yum! Brands
YUM
$41.9B
$4.76M 0.01%
30,600
-1,683
-5% -$267K
IOT icon
516
Samsara
IOT
$22.6B
$4.75M 0.01%
149,738
-1,173,208
-89% -$35.8M
FND icon
517
Floor & Decor
FND
$6.03B
$4.7M 0.01%
92,448
+2,821
+3% +$184K
SLDB icon
518
Solid Biosciences
SLDB
$792M
$4.69M 0.01%
+651,216
New +$4.18M
FSS icon
519
Federal Signal
FSS
$6.82B
$4.63M 0.01%
42,859
-2,683
-6% -$303K
ITT icon
520
ITT
ITT
$17.1B
$4.59M 0.01%
24,111
-83
-0.3% -$15.8K
KRMN
521
Karman Holdings
KRMN
$6.04B
$4.57M 0.01%
57,033
+20,146
+55% +$1.94M
DIVO icon
522
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.45B
$4.55M 0.01%
101,339
+5,918
+6% +$271K
TMUS icon
523
T-Mobile US
TMUS
$195B
$4.54M 0.01%
21,604
+4,321
+25% +$888K
AZO icon
524
AutoZone
AZO
$51.3B
$4.51M 0.01%
1,334
+518
+63% +$1.86M
SXI icon
525
Standex International
SXI
$3.33B
$4.47M 0.01%
17,532
+16,414
+1,468% +$4.12M
19 20
21
22 23

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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.