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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
TOTL icon
1276
State Street DoubleLine Total Return Tactical ETF
TOTL
$4.1B
$348K ﹤0.01%
+8,763
New +$352K
BAX icon
1277
Baxter International
BAX
$12.8B
$348K ﹤0.01%
20,718
+1,691
+9% +$32.7K
COFS icon
1278
Choiceone Financial
COFS
$514M
$348K ﹤0.01%
12,361
-4,914
-28% -$141K
ARW icon
1279
Arrow Electronics
ARW
$10.5B
$346K ﹤0.01%
2,415
-411
-15% -$56.3K
AOA icon
1280
iShares Core 80/20 Aggressive Allocation ETF
AOA
$3.13B
$345K ﹤0.01%
3,902
+771
+25% +$70.2K
RWL icon
1281
Invesco S&P 500 Revenue ETF
RWL
$9.57B
$344K ﹤0.01%
2,997
+1,880
+168% +$222K
IYZ icon
1282
iShares US Telecommunications ETF
IYZ
$1.16B
$344K ﹤0.01%
8,756
+26
+0.3% +$973
BNS icon
1283
Scotiabank
BNS
$105B
$341K ﹤0.01%
+4,921
New +$361K
EIX icon
1284
Edison International
EIX
$30.3B
$340K ﹤0.01%
4,651
+836
+22% +$56.4K
JAZZ icon
1285
Jazz Pharmaceuticals
JAZZ
$16.1B
$339K ﹤0.01%
1,791
+45
+3% +$7.86K
BKLN icon
1286
Invesco Senior Loan ETF
BKLN
$6.96B
$338K ﹤0.01%
16,582
-2,667
-14% -$55.1K
VOD icon
1287
Vodafone
VOD
$37.1B
$338K ﹤0.01%
22,523
-2,950
-12% -$43.1K
FUTY icon
1288
Fidelity MSCI Utilities Index ETF
FUTY
$2.34B
$337K ﹤0.01%
5,710
-123
-2% -$7.13K
MDYV icon
1289
State Street SPDR S&P 400 Mid Cap Value ETF
MDYV
$2.76B
$336K ﹤0.01%
3,949
+1,341
+51% +$118K
UBS icon
1290
UBS Group
UBS
$170B
$336K ﹤0.01%
8,597
-1,667
-16% -$71.3K
STAG icon
1291
STAG Industrial
STAG
$7.44B
$335K ﹤0.01%
9,296
-169
-2% -$6.41K
EEFT icon
1292
Euronet Worldwide
EEFT
$3.19B
$335K ﹤0.01%
5,050
+24
+0.5% +$1.72K
TILT icon
1293
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.15B
$335K ﹤0.01%
1,386
-5
-0.4% -$1.25K
PLXS icon
1294
Plexus
PLXS
$6.43B
$333K ﹤0.01%
1,646
-84
-5% -$16K
UHAL.B icon
1295
U-Haul Holding Co Series N
UHAL.B
$12.4B
$330K ﹤0.01%
+7,391
New +$350K
GRAL
1296
GRAIL Inc
GRAL
$2.72B
$330K ﹤0.01%
6,376
+1,020
+19% +$79K
MTDR icon
1297
Matador Resources
MTDR
$6.04B
$328K ﹤0.01%
+5,199
New +$260K
OVV icon
1298
Ovintiv
OVV
$17B
$327K ﹤0.01%
+5,506
New +$266K
PRFZ icon
1299
Invesco FTSE RAFI US 1500 Small-Mid ETF
PRFZ
$2.74B
$327K ﹤0.01%
7,122
– –
SPH icon
1300
Suburban Propane Partners
SPH
$1.21B
$326K ﹤0.01%
+16,574
New +$331K
50 51
52
53 54

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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.