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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
+7.16%
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
$37.6B
AUM Growth
+$1.57B
Cap. Flow
-$160M
Cap. Flow %
-0.43%
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75

Top Buys

Rank Stock Value
1
META icon
Meta Platforms (Facebook)
META
+$76.1M
2
APP icon
Applovin
APP
+$75.3M
3
NOW icon
ServiceNow
NOW
+$66.6M
4
CWAN
Clearwater Analytics
CWAN
+$65.8M
5
FANG icon
Diamondback Energy
FANG
+$30.7M

Top Sells

Rank Stock Value
1
CYBR
CyberArk
CYBR
+$70.7M
2
ADBE icon
Adobe
ADBE
+$61.7M
3
MSFT icon
Microsoft
MSFT
+$45.7M
4
WDAY icon
Workday
WDAY
+$42.6M
5
POOL icon
Pool Corp
POOL
+$41.7M

Sector Composition

Rank Sector Weight
1 Technology 27.36%
2 Financials 13.36%
3 Industrials 12.59%
4 Healthcare 10.97%
5 Consumer Discretionary 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
BNDX icon
1376
Vanguard Total International Bond ETF
BNDX
$83B
$249K ﹤0.01%
5,039
-7
-0.1% -$345
BAP icon
1377
Credicorp
BAP
$30.1B
$248K ﹤0.01%
+933
New +$231K
TDIV icon
1378
First Trust NASDAQ Technology Dividend Index Fund
TDIV
$4.46B
$248K ﹤0.01%
2,517
+342
+16% +$31.9K
BFLY icon
1379
Butterfly Network
BFLY
$2.46B
$248K ﹤0.01%
128,500
+10,000
+8% +$17K
EWO icon
1380
iShares MSCI Austria ETF
EWO
$188M
$248K ﹤0.01%
8,000
– –
IKT icon
1381
Inhibikase Therapeutics
IKT
$380M
$248K ﹤0.01%
152,953
-4,000
-3% -$6.93K
CQP icon
1382
Cheniere Energy
CQP
$33.1B
$248K ﹤0.01%
4,600
+300
+7% +$16.3K
OII icon
1383
Oceaneering
OII
$5.13B
$247K ﹤0.01%
+9,964
New +$229K
HST icon
1384
Host Hotels & Resorts
HST
$15.6B
$246K ﹤0.01%
14,478
+1,056
+8% +$17.5K
SUSC icon
1385
iShares ESG Aware USD Corporate Bond ETF
SUSC
$1.29B
$245K ﹤0.01%
10,410
-58
-0.6% -$1.35K
VICR icon
1386
Vicor
VICR
$10.6B
$244K ﹤0.01%
4,910
– –
CLOV icon
1387
Clover Health Investments
CLOV
$2.37B
$243K ﹤0.01%
79,500
+28,000
+54% +$80K
MRTN icon
1388
Marten Transport
MRTN
$1.24B
$243K ﹤0.01%
22,800
– –
NIC icon
1389
Nicolet Bankshares
NIC
$3.75B
$243K ﹤0.01%
1,804
-633
-26% -$84K
PRMB
1390
Primo Brands
PRMB
$8.99B
$242K ﹤0.01%
10,968
-36,137
-77% -$935K
AWR icon
1391
American States Water
AWR
$3.51B
$242K ﹤0.01%
3,304
-143
-4% -$10.6K
SHE icon
1392
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$339M
$242K ﹤0.01%
1,895
+1
+0.1% +$125
AIVL icon
1393
WisdomTree US AI Enhanced Value Fund
AIVL
$436M
$240K ﹤0.01%
2,103
– –
RING icon
1394
iShares MSCI Global Gold Miners ETF
RING
$2.39B
$239K ﹤0.01%
3,691
+865
+31% +$44.3K
EUSA icon
1395
iShares MSCI USA Equal Weighted ETF
EUSA
$1.95B
$238K ﹤0.01%
2,314
– –
FLUT icon
1396
Flutter Entertainment
FLUT
$16.9B
$233K ﹤0.01%
918
-35
-4% -$10.2K
BIPC icon
1397
Brookfield Infrastructure
BIPC
$4.97B
$233K ﹤0.01%
5,656
+501
+10% +$20.3K
GUNR icon
1398
FlexShares Global Upstream Natural Resources Index Fund
GUNR
$6.99B
$232K ﹤0.01%
5,307
-3,389
-39% -$142K
REGL icon
1399
ProShares S&P MidCap 400 Dividend Aristocrats ETF
REGL
$1.81B
$232K ﹤0.01%
2,717
+1,770
+187% +$149K
HEEM icon
1400
iShares Currency Hedged MSCI Emerging Markets
HEEM
$294M
$232K ﹤0.01%
6,880
– –
54 55
56
57 58

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William Blair & Company's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.

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

  • William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
  • William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
  • William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
  • William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
  • William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
  • William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
  • William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.

Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.