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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
KD icon
1876
Kyndryl
KD
$2.85B
– –
-5,416
Closed -$227K
KDP icon
1877
Keurig Dr Pepper
KDP
$40.2B
– –
-12,201
Closed -$403K
KMPR icon
1878
Kemper
KMPR
$1.56B
– –
-3,245
Closed -$209K
KNX icon
1879
Knight Transportation
KNX
$11.6B
– –
-4,821
Closed -$213K
LCTX icon
1880
Lineage Cell Therapeutics
LCTX
$278M
– –
-20,000
Closed -$18.1K
LFST icon
1881
Lifestance Health
LFST
$4.67B
– –
-13,487
Closed -$69.7K
LRN icon
1882
Stride
LRN
$3.27B
– –
-51,424
Closed -$7.47M
MAGS icon
1883
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.15B
– –
-5,805
Closed -$322K
MINO icon
1884
PIMCO Municipal Income Opportunities Active ETF
MINO
$753M
– –
-1,860
Closed -$82.3K
ODD icon
1885
ODDITY Tech
ODD
$595M
– –
-2,700
Closed -$204K
PBP icon
1886
Invesco S&P 500 BuyWrite ETF
PBP
$364M
– –
-108
Closed -$2.36K
PDN icon
1887
Invesco FTSE RAFI Developed Markets ex-US Small-Mid ETF
PDN
$366M
– –
-338
Closed -$13.2K
PTLC icon
1888
Pacer Trendpilot US Large Cap ETF
PTLC
$3.37B
– –
-3,829
Closed -$194K
RCKT icon
1889
Rocket Pharmaceuticals
RCKT
$374M
– –
-104,211
Closed -$255K
RELX icon
1890
RELX
RELX
$60.2B
– –
-6,759
Closed -$367K
LNAI
1891
Lunai Bioworks
LNAI
$10.7M
– –
-201
Closed -$4.65K
SCHJ icon
1892
Schwab 1-5 Year Corporate Bond ETF
SCHJ
$848M
– –
-2,262
Closed -$56.1K
SCHZ icon
1893
Schwab US Aggregate Bond ETF
SCHZ
$10.5B
– –
-1,712
Closed -$39.8K
SENS icon
1894
Senseonics Holdings Inc
SENS
$419M
– –
-1,215
Closed -$11.6K
SLDB icon
1895
Solid Biosciences
SLDB
$971M
– –
-165,700
Closed -$807K
SLVP icon
1896
iShares MSCI Global Silver and Metals Miners ETF
SLVP
$976M
– –
-575
Closed -$10.2K
SMIG icon
1897
Bahl & Gaynor Small/Mid Cap Income Growth ETF
SMIG
$1.5B
– –
-9,378
Closed -$271K
SNAP icon
1898
Snap
SNAP
$8.79B
– –
-10,471
Closed -$91K
SOXQ icon
1899
Invesco PHLX Semiconductor ETF
SOXQ
$2.92B
– –
-200
Closed -$8.73K
SSTI icon
1900
SoundThinking
SSTI
$106M
– –
-27,328
Closed -$357K
73 74 75
76
77

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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.