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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
RGLD icon
451
Royal Gold
RGLD
$16.6B
$6.25M 0.02%
24,554
+26
+0.1% +$6.9K
XMMO icon
452
Invesco S&P MidCap Momentum ETF
XMMO
$6.9B
$6.18M 0.02%
42,641
-3,673
-8% -$531K
COR icon
453
Cencora
COR
$62B
$6.18M 0.02%
19,684
+48
+0.2% +$16.8K
SNPS icon
454
Synopsys
SNPS
$71.6B
$6.16M 0.02%
15,530
-1,584
-9% -$716K
PYPL icon
455
PayPal
PYPL
$50.3B
$6.15M 0.02%
136,007
-27,082
-17% -$1.31M
SYM icon
456
Symbotic
SYM
$5.13B
$6.12M 0.02%
115,059
-8,878
-7% -$508K
IGV icon
457
iShares Expanded Tech-Software Sector ETF
IGV
$12.4B
$6.12M 0.02%
76,457
+68,663
+881% +$6.08M
IRDM icon
458
Iridium Communications
IRDM
$4.7B
$6.11M 0.02%
220,251
-14,707
-6% -$331K
BOTZ icon
459
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.14B
$6.1M 0.02%
183,769
+5,819
+3% +$215K
WDC icon
460
Western Digital
WDC
$159B
$6.08M 0.02%
22,491
+3,572
+19% +$932K
SCHX icon
461
Schwab US Large- Cap ETF
SCHX
$70.3B
$6.07M 0.02%
236,815
-422
-0.2% -$11.3K
VIS icon
462
Vanguard Industrials ETF
VIS
$7.94B
$6.07M 0.02%
19,441
-142
-0.7% -$46.1K
VCIT icon
463
Vanguard Intermediate-Term Corporate Bond ETF
VCIT
$66.2B
$6.04M 0.02%
72,966
+2,516
+4% +$211K
IWP icon
464
iShares Russell Mid-Cap Growth ETF
IWP
$19.4B
$6.02M 0.02%
46,975
+2,455
+6% +$332K
SHY icon
465
iShares 1-3 Year Treasury Bond ETF
SHY
$25.4B
$6.01M 0.02%
72,800
+6,554
+10% +$543K
WELL icon
466
Welltower
WELL
$173B
$5.99M 0.02%
30,320
+379
+1% +$74.9K
MELI icon
467
Mercado Libre
MELI
$94.5B
$5.95M 0.02%
3,444
-695
-17% -$1.34M
PTLO icon
468
Portillo's
PTLO
$345M
$5.89M 0.02%
1,112,922
+127,902
+13% +$696K
VYMI icon
469
Vanguard International High Dividend Yield ETF
VYMI
$20.3B
$5.88M 0.02%
62,369
+39,175
+169% +$3.73M
IDV icon
470
iShares International Select Dividend ETF
IDV
$8.31B
$5.87M 0.02%
137,841
+602
+0.4% +$25.3K
DXJ icon
471
WisdomTree Japan Hedged Equity Fund
DXJ
$7.07B
$5.85M 0.02%
36,879
+120
+0.3% +$18.9K
ONT
472
Onterris Inc
ONT
$731M
$5.84M 0.02%
266,980
-73,889
-22% -$1.77M
IHI icon
473
iShares US Medical Devices ETF
IHI
$3.17B
$5.83M 0.02%
109,202
-648
-0.6% -$38.1K
DOCU
474
DocuSign
DOCU
$11.1B
$5.8M 0.02%
122,244
-52,970
-30% -$2.71M
IGSB icon
475
iShares 1-5 Year Investment Grade Corporate Bond ETF
IGSB
$23B
$5.79M 0.02%
110,159
+6,662
+6% +$352K
17 18
19
20 21

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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.