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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
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WES icon
1001
Western Midstream Partners
WES
$19.3B
$673K ﹤0.01%
17,390
+8,079
+87% +$307K
NRG icon
1002
NRG Energy
NRG
$24.8B
$668K ﹤0.01%
4,157
+235
+6% +$31K
KRYS icon
1003
Krystal Biotech
KRYS
$9.66B
$667K ﹤0.01%
4,852
-4,581
-49% -$673K
CAKE icon
1004
Cheesecake Factory
CAKE
$5.33B
$667K ﹤0.01%
10,639
+5,466
+106% +$291K
HSBC icon
1005
HSBC
HSBC
$356B
$660K ﹤0.01%
10,865
-446
-4% -$25.4K
REGN icon
1006
Regeneron Pharmaceuticals
REGN
$80.8B
$660K ﹤0.01%
1,257
-25
-2% -$14K
XYLD icon
1007
Global X S&P 500 Covered Call ETF
XYLD
$3.27B
$659K ﹤0.01%
16,927
-584
-3% -$22.4K
IFF icon
1008
International Flavors & Fragrances
IFF
$21.9B
$659K ﹤0.01%
8,955
+1,391
+18% +$105K
EMLP icon
1009
First Trust North American Energy Infrastructure Fund
EMLP
$4.08B
$654K ﹤0.01%
17,433
+6,400
+58% +$234K
WBD icon
1010
Warner Bros
WBD
$67.1B
$652K ﹤0.01%
56,936
-21,612
-28% -$202K
OSIS icon
1011
OSI Systems
OSIS
$3.89B
$651K ﹤0.01%
+2,893
New +$617K
LAMR icon
1012
Lamar Advertising Co
LAMR
$16.3B
$650K ﹤0.01%
5,358
+81
+2% +$9.4K
LEN.B icon
1013
Lennar Class B
LEN.B
$20.8B
$649K ﹤0.01%
6,168
+24
+0.4% +$2.48K
IEX icon
1014
IDEX
IEX
$17.3B
$649K ﹤0.01%
3,697
-394
-10% -$69.8K
DG icon
1015
Dollar General
DG
$27.9B
$648K ﹤0.01%
5,665
+1,938
+52% +$192K
SMCI icon
1016
Super Micro Computer
SMCI
$20.1B
$645K ﹤0.01%
13,156
-20
-0.2% -$771
ZETA icon
1017
Zeta Global
ZETA
$6.69B
$644K ﹤0.01%
41,566
+12,643
+44% +$168K
GBDC icon
1018
Golub Capital BDC
GBDC
$3.42B
$642K ﹤0.01%
43,826
– –
EES icon
1019
WisdomTree US SmallCap Earnings Fund
EES
$731M
$642K ﹤0.01%
12,599
-1,760
-12% -$84.9K
MFC icon
1020
Manulife Financial
MFC
$73.5B
$635K ﹤0.01%
19,880
+2
+0% +$62
IBRX icon
1021
ImmunityBio
IBRX
$8.1B
$633K ﹤0.01%
239,814
+6,314
+3% +$17K
HSIC icon
1022
Henry Schein
HSIC
$9.82B
$633K ﹤0.01%
8,665
-529
-6% -$36.4K
VPL icon
1023
Vanguard FTSE Pacific ETF
VPL
$8.43B
$631K ﹤0.01%
7,682
-177
-2% -$13.5K
HDB icon
1024
HDFC Bank
HDB
$121B
$630K ﹤0.01%
16,438
+1,570
+11% +$56.9K
RRX icon
1025
Regal Rexnord
RRX
$11.9B
$630K ﹤0.01%
4,344
-343
-7% -$43K
39 40
41
42 43

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.