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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
(-6.3%)
Cap. Flow
-$465K
Cap. Flow
% of AUM
-0%
Top 10 Holdings %
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco S&P 500 Equal Weight ETF
RSP
|
+$224M |
| 2 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$113M |
| 3 |
Quanta Services
PWR
|
+$75M |
| 4 |
SPDR Gold Trust
GLD
|
+$58.9M |
| 5 |
Boeing
BA
|
+$55.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Workday
WDAY
|
+$91.2M |
| 2 |
CWAN
Clearwater Analytics
CWAN
|
+$78M |
| 3 |
Applovin
APP
|
+$74.7M |
| 4 |
Tyler Technologies
TYL
|
+$69.1M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
951
Ubiquiti
UI
$31.6B
| $976K | ﹤0.01% |
1,235
+131
| +12% | +$88.9K |
|
952
Icon
ICLR
$13.7B
| $973K | ﹤0.01% |
8,797
-5,949
| -40% | -$813K |
|
953
Cognex
CGNX
$9.62B
| $972K | ﹤0.01% |
19,838
+195
| +1% | +$9.1K |
|
954
iShares Core MSCI Europe ETF
IEUR
$8.8B
| $968K | ﹤0.01% |
13,778
+2,129
| +18% | +$155K |
|
955
Manchester United
MANU
$4.03B
| $966K | ﹤0.01% |
+57,456
| New | +$979K |
|
956
Toronto Dominion Bank
TD
$193B
| $965K | ﹤0.01% |
10,346
+6,509
| +170% | +$619K |
|
957
XPO
XPO
$23.4B
| $964K | ﹤0.01% |
4,956
+29
| +0.6% | +$5.2K |
|
958
iShares S&P Small-Cap 600 Value ETF
IJS
$8.12B
| $959K | ﹤0.01% |
8,095
-124
| -2% | -$15K |
|
959
iShares ESG MSCI USA Leaders ETF
SUSL
$1.1B
| $958K | ﹤0.01% |
8,434
+374
| +5% | +$44.9K |
|
960
Civista Bancshares
CIVB
$608M
| $958K | ﹤0.01% |
42,025
+25
| +0.1% | +$579 |
|
961
Diodes
DIOD
$3.5B
| $956K | ﹤0.01% |
+14,005
| New | +$883K |
|
962
United Therapeutics
UTHR
$26.1B
| $949K | ﹤0.01% |
1,600
-200
| -11% | -$99.6K |
|
963
Viasat
VSAT
$9.67B
| $947K | ﹤0.01% |
20,668
+6,166
| +43% | +$277K |
|
964
KeyCorp
KEY
$23.8B
| $946K | ﹤0.01% |
47,158
+14,557
| +45% | +$305K |
|
965
Robert Half
RHI
$4.11B
| $925K | ﹤0.01% |
36,410
-79
| -0.2% | -$2.09K |
|
966
Atlanta Braves Holdings Series A
BATRA
$3.51B
| $924K | ﹤0.01% |
+19,604
| New | +$895K |
|
967
Citizens Financial Group
CFG
$30.1B
| $919K | ﹤0.01% |
15,330
-886
| -5% | -$54.5K |
|
968
LyondellBasell Industries
LYB
$19.5B
| $914K | ﹤0.01% |
11,340
+3,015
| +36% | +$179K |
|
969
NextNav
NN
$1.79B
| $913K | ﹤0.01% |
57,000
| – | – |
|
970
Yum China
YUMC
$15.7B
| $910K | ﹤0.01% |
18,659
-123
| -0.7% | -$6.37K |
|
971
Center Bancorp
CNOB
$1.65B
| $909K | ﹤0.01% |
33,955
+385
| +1% | +$10.3K |
|
972
iShares Expanded Tech Sector ETF
IGM
$9.57B
| $903K | ﹤0.01% |
7,621
-47,298
| -86% | -$5.95M |
|
973
NXP Semiconductors
NXPI
$60.8B
| $897K | ﹤0.01% |
4,555
+189
| +4% | +$41.9K |
|
974
Regal Rexnord
RRX
$12.5B
| $891K | ﹤0.01% |
4,759
-126
| -3% | -$23.4K |
|
975
Innovator US Equity Buffer ETF February
BFEB
$250M
| $889K | ﹤0.01% |
18,642
+21
| +0.1% | +$1.03K |
|
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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.