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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
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
OEF icon
426
iShares S&P 100 ETF
OEF
$20.4B
$6.98M 0.02%
21,931
-259
-1% -$86.8K
NUE icon
427
Nucor
NUE
$61.5B
$6.91M 0.02%
40,875
-612
-1% -$107K
PLNT icon
428
Planet Fitness
PLNT
$3.65B
$6.9M 0.02%
92,829
-7,907
-8% -$695K
UCB
429
United Community Banks
UCB
$4.36B
$6.86M 0.02%
217,848
+155
+0.1% +$5.1K
TRV icon
430
Travelers Companies
TRV
$78.5B
$6.86M 0.02%
23,516
-570
-2% -$167K
TDUP icon
431
ThredUp
TDUP
$411M
$6.83M 0.02%
2,082,554
+576,399
+38% +$2.67M
YETI icon
432
Yeti Holdings
YETI
$3.75B
$6.82M 0.02%
186,422
-97,940
-34% -$4.31M
CTVA icon
433
Corteva
CTVA
$50.1B
$6.73M 0.02%
80,417
+2,769
+4% +$209K
KRNT icon
434
Kornit Digital
KRNT
$815M
$6.64M 0.02%
452,601
-1,827
-0.4% -$26.7K
BINC icon
435
BlackRock Flexible Income ETF
BINC
$16.3B
$6.61M 0.02%
127,237
-46,746
-27% -$2.46M
WCN
436
Waste Connections
WCN
$41.9B
$6.6M 0.02%
40,635
-37,546
-48% -$6.26M
ULTA icon
437
Ulta Beauty
ULTA
$23B
$6.57M 0.02%
12,571
+61
+0.5% +$38.8K
HURN icon
438
Huron Consulting
HURN
$2.34B
$6.56M 0.02%
51,446
-3,504
-6% -$527K
XLU icon
439
State Street Utilities Select Sector SPDR ETF
XLU
$22.7B
$6.54M 0.02%
142,622
-164
-0.1% -$7.36K
ENB icon
440
Enbridge
ENB
$113B
$6.52M 0.02%
120,371
+643
+0.5% +$32.8K
CGUS icon
441
Capital Group Core Equity ETF
CGUS
$11.9B
$6.5M 0.02%
169,303
+2,866
+2% +$115K
BAH icon
442
Booz Allen Hamilton
BAH
$9.31B
$6.48M 0.02%
83,056
-16,863
-17% -$1.42M
DGRO icon
443
iShares Core Dividend Growth ETF
DGRO
$43.6B
$6.47M 0.02%
92,225
+2,643
+3% +$189K
TSCO icon
444
Tractor Supply
TSCO
$18.5B
$6.45M 0.02%
142,401
+11,205
+9% +$571K
SOFI icon
445
SoFi Technologies
SOFI
$22.9B
$6.44M 0.02%
405,759
-246,108
-38% -$5.19M
J icon
446
Jacobs Solutions
J
$16.9B
$6.42M 0.02%
50,429
-536
-1% -$72.9K
ITA icon
447
iShares US Aerospace & Defense ETF
ITA
$14.9B
$6.33M 0.02%
28,960
+3,511
+14% +$821K
PBH icon
448
Prestige Consumer Healthcare
PBH
$2.52B
$6.31M 0.02%
106,485
+4,637
+5% +$301K
XYL icon
449
Xylem
XYL
$28.2B
$6.29M 0.02%
52,617
-4,469
-8% -$586K
VCYT icon
450
Veracyte
VCYT
$3.7B
$6.28M 0.02%
194,887
+3,184
+2% +$118K
16 17
18
19 20

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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.