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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
VBR icon
301
Vanguard Small-Cap Value ETF
VBR
$37.5B
$12.9M 0.04%
59,206
+723
+1% +$162K
FTNT icon
302
Fortinet
FTNT
$108B
$12.8M 0.04%
156,820
-3,813
-2% -$308K
KNSL icon
303
Kinsale Capital Group
KNSL
$8.55B
$12.8M 0.04%
37,507
-957
-2% -$363K
AVAV icon
304
AeroVironment
AVAV
$7.45B
$12.8M 0.04%
69,962
-12,050
-15% -$3.17M
T icon
305
AT&T
T
$167B
$12.8M 0.04%
440,219
-5,802
-1% -$155K
XMTR icon
306
Xometry
XMTR
$4.57B
$12.7M 0.04%
311,572
+13,383
+4% +$711K
NOC icon
307
Northrop Grumman
NOC
$77.1B
$12.7M 0.04%
18,585
+2,716
+17% +$1.88M
SO icon
308
Southern Company
SO
$108B
$12.7M 0.04%
131,248
+2,343
+2% +$217K
DVN icon
309
Devon Energy
DVN
$50.9B
$12.6M 0.04%
251,102
-248,548
-50% -$10.7M
VGK icon
310
Vanguard FTSE Europe ETF
VGK
$30.2B
$12.5M 0.04%
151,639
+92,617
+157% +$7.96M
IWO icon
311
iShares Russell 2000 Growth ETF
IWO
$14.2B
$12.3M 0.04%
39,343
+1,699
+5% +$565K
PAYX icon
312
Paychex
PAYX
$43.7B
$12.3M 0.04%
133,699
-13,571
-9% -$1.34M
IJAN icon
313
Innovator International Developed Power Buffer ETF January
IJAN
$258M
$12.3M 0.04%
339,221
+127,258
+60% +$4.68M
NSC icon
314
Norfolk Southern
NSC
$75.6B
$12.2M 0.04%
42,505
+263
+0.6% +$78.2K
OKE icon
315
Oneok
OKE
$56.2B
$12.2M 0.03%
134,506
+1,227
+0.9% +$101K
PLMR icon
316
Palomar
PLMR
$3.78B
$12.1M 0.03%
101,428
-25,993
-20% -$3.24M
DUK icon
317
Duke Energy
DUK
$101B
$12.1M 0.03%
92,529
+350
+0.4% +$43.8K
HOOD icon
318
Robinhood
HOOD
$82B
$12.1M 0.03%
174,625
-2,364
-1% -$208K
UPS icon
319
United Parcel Service
UPS
$89.5B
$12.1M 0.03%
122,943
+43,385
+55% +$4.65M
SDY icon
320
State Street SPDR S&P Dividend ETF
SDY
$22.2B
$12.1M 0.03%
82,756
+5,551
+7% +$827K
EFX icon
321
Equifax
EFX
$22.2B
$12.1M 0.03%
67,064
-10,194
-13% -$2.02M
VKTX icon
322
Viking Therapeutics
VKTX
$3.9B
$12.1M 0.03%
371,119
-52,845
-12% -$1.7M
DLN icon
323
WisdomTree US LargeCap Dividend Fund
DLN
$6.27B
$11.7M 0.03%
131,267
+13,064
+11% +$1.19M
VPU
324
Vanguard Utilities ETF
VPU
$8.59B
$11.6M 0.03%
58,648
+1,236
+2% +$240K
SIMO icon
325
Silicon Motion
SIMO
$7.23B
$11.6M 0.03%
+103,179
New +$12.5M
11 12
13
14 15

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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.