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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
JBHT icon
1026
JB Hunt Transport Services
JBHT
$25.9B
$757K ﹤0.01%
3,573
+233
+7% +$49.6K
JEF icon
1027
Jefferies Financial Group
JEF
$12.7B
$755K ﹤0.01%
18,301
+1,062
+6% +$55.1K
VICR icon
1028
Vicor
VICR
$8.33B
$752K ﹤0.01%
4,669
-522
-10% -$86.3K
ALHC icon
1029
Alignment Healthcare
ALHC
$3.78B
$748K ﹤0.01%
+42,450
New +$853K
SH icon
1030
ProShares Short S&P500
SH
$928M
$744K ﹤0.01%
19,613
+2
+0% +$73
LAMR icon
1031
Lamar Advertising Co
LAMR
$16.7B
$743K ﹤0.01%
5,866
+671
+13% +$87.9K
MUFG icon
1032
Mitsubishi UFJ Financial
MUFG
$247B
$738K ﹤0.01%
43,512
-1,622
-4% -$28.9K
PRIM icon
1033
Primoris Services
PRIM
$4.06B
$734K ﹤0.01%
5,130
-12,359
-71% -$1.81M
ITGR icon
1034
Integer Holdings
ITGR
$3.39B
$732K ﹤0.01%
8,317
-413
-5% -$35.2K
EMLP icon
1035
First Trust North American Energy Infrastructure Fund
EMLP
$4.1B
$728K ﹤0.01%
16,682
-249
-1% -$10.4K
NJAN icon
1036
Innovator Growth-100 Power Buffer ETF January
NJAN
$346M
$724K ﹤0.01%
13,567
+900
+7% +$49.2K
PAA icon
1037
Plains All American Pipeline
PAA
$17.6B
$715K ﹤0.01%
32,021
+516
+2% +$10.5K
MOG.A icon
1038
Moog Inc Class A
MOG.A
$12.4B
$714K ﹤0.01%
2,438
+682
+39% +$209K
RPG icon
1039
Invesco S&P 500 Pure Growth ETF
RPG
$1.9B
$713K ﹤0.01%
15,264
– –
GPC icon
1040
Genuine Parts
GPC
$17.9B
$712K ﹤0.01%
6,734
+91
+1% +$11.3K
MFC icon
1041
Manulife Financial
MFC
$73B
$707K ﹤0.01%
20,520
+1,794
+10% +$64.6K
NRG icon
1042
NRG Energy
NRG
$26.2B
$707K ﹤0.01%
4,835
+112
+2% +$17.6K
BELFB
1043
Bel Fuse Inc Class B
BELFB
$3.45B
$698K ﹤0.01%
3,525
-4,500
-56% -$940K
FLG
1044
Flagstar Bank National Association
FLG
$5.87B
$692K ﹤0.01%
52,541
– –
RL icon
1045
Ralph Lauren
RL
$22.4B
$691K ﹤0.01%
2,009
+15
+0.8% +$5.33K
PSA icon
1046
Public Storage
PSA
$61.5B
$690K ﹤0.01%
2,546
+146
+6% +$41.9K
TRP icon
1047
TC Energy
TRP
$70.1B
$676K ﹤0.01%
+10,795
New +$651K
DECK icon
1048
Deckers Outdoor
DECK
$14.1B
$675K ﹤0.01%
6,748
-1,129
-14% -$121K
FTAI icon
1049
FTAI Aviation
FTAI
$20.2B
$668K ﹤0.01%
2,726
+32
+1% +$8.47K
HALO icon
1050
Halozyme
HALO
$9.88B
$659K ﹤0.01%
+10,203
New +$719K
40 41
42
43 44

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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.