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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
CNTN
876
Canton Strategic Holdings
CNTN
$149M
$1.23M ﹤0.01%
374,692
+100,368
+37% +$397K
VLUE icon
877
iShares MSCI USA Value Factor ETF
VLUE
$9.03B
$1.22M ﹤0.01%
8,596
-72
-0.8% -$10.6K
DTD icon
878
WisdomTree US Total Dividend Fund
DTD
$1.64B
$1.22M ﹤0.01%
14,110
– –
SCHM icon
879
Schwab US Mid-Cap ETF
SCHM
$14.2B
$1.22M ﹤0.01%
39,324
+68
+0.2% +$2.17K
RBLX icon
880
Roblox
RBLX
$35.9B
$1.21M ﹤0.01%
21,439
-5,211
-20% -$350K
FFIC
881
DELISTED
Flushing Financial
FFIC
$1.21M ﹤0.01%
78,721
+187
+0.2% +$2.92K
GRID
882
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$10.8B
$1.21M ﹤0.01%
7,380
+325
+5% +$54K
FSLR icon
883
First Solar
FSLR
$21.4B
$1.2M ﹤0.01%
6,094
-708
-10% -$157K
EXP icon
884
Eagle Materials
EXP
$6.49B
$1.19M ﹤0.01%
6,307
-630
-9% -$134K
XME icon
885
State Street SPDR S&P Metals & Mining ETF
XME
$3.75B
$1.19M ﹤0.01%
11,050
+8,638
+358% +$1.01M
AEIS icon
886
Advanced Energy
AEIS
$10.1B
$1.19M ﹤0.01%
3,679
+1,693
+85% +$491K
KVYO icon
887
Klaviyo
KVYO
$5.8B
$1.19M ﹤0.01%
60,971
-14,166
-19% -$304K
ENTG icon
888
Entegris
ENTG
$16.3B
$1.19M ﹤0.01%
10,112
+86
+0.9% +$10.2K
SSO icon
889
ProShares Ultra S&P500
SSO
$7.52B
$1.18M ﹤0.01%
22,703
-427
-2% -$24.4K
WFC.PRL icon
890
Wells Fargo 7.5% Non Cumv Perp Conv
WFC.PRL
$4.68B
$1.17M ﹤0.01%
1,016
+31
+3% +$37.7K
SCHV
891
Schwab US Large-Cap Value ETF
SCHV
$15.6B
$1.17M ﹤0.01%
38,363
+241
+0.6% +$7.51K
TLT icon
892
iShares 20+ Year Treasury Bond ETF
TLT
$42.4B
$1.16M ﹤0.01%
13,436
+850
+7% +$74.7K
ICF icon
893
iShares Select U.S. REIT ETF
ICF
$2.13B
$1.16M ﹤0.01%
18,786
– –
ATO icon
894
Atmos Energy
ATO
$29.7B
$1.16M ﹤0.01%
6,287
+3,679
+141% +$650K
GRMN
895
Garmin
GRMN
$56.9B
$1.16M ﹤0.01%
4,987
+49
+1% +$11K
HROW icon
896
Harrow
HROW
$1.44B
$1.16M ﹤0.01%
32,760
+5,357
+20% +$235K
NI icon
897
NiSource
NI
$21.5B
$1.15M ﹤0.01%
24,647
+1,209
+5% +$54.5K
XLG icon
898
Invesco S&P 500 Top 50 ETF
XLG
$10.2B
$1.15M ﹤0.01%
21,019
-605
-3% -$34.7K
EXE
899
Expand Energy Corp
EXE
$21.4B
$1.14M ﹤0.01%
10,423
+5,786
+125% +$618K
LQD icon
900
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$34.3B
$1.14M ﹤0.01%
10,498
-525
-5% -$57.9K
34 35
36
37 38

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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.