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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
PDD icon
1276
Pinduoduo
PDD
$120B
$329K ﹤0.01%
+2,491
New +$295K
TMC icon
1277
TMC The Metals Company
TMC
$1.91B
$328K ﹤0.01%
+51,550
New +$309K
WBS icon
1278
Webster Financial
WBS
$12.8B
$322K ﹤0.01%
5,412
+14
+0.3% +$834
FNV icon
1279
Franco-Nevada
FNV
$44.7B
$320K ﹤0.01%
+1,436
New +$259K
SM icon
1280
SM Energy
SM
$7.71B
$319K ﹤0.01%
12,757
+11
+0.1% +$297
SMFG icon
1281
Sumitomo Mitsui Financial
SMFG
$167B
$318K ﹤0.01%
+19,001
New +$304K
CVCO icon
1282
Cavco Industries
CVCO
$4.67B
$317K ﹤0.01%
+546
New +$267K
GRAL
1283
GRAIL Inc
GRAL
$3.05B
$317K ﹤0.01%
5,356
+268
+5% +$10.2K
KIE icon
1284
State Street SPDR S&P Insurance ETF
KIE
$681M
$316K ﹤0.01%
5,329
– –
CINF icon
1285
Cincinnati Financial
CINF
$26.5B
$316K ﹤0.01%
1,998
-894
-31% -$136K
GPN icon
1286
Global Payments
GPN
$25.1B
$314K ﹤0.01%
3,779
-19,248
-84% -$1.62M
ABEV icon
1287
Ambev
ABEV
$43.8B
$313K ﹤0.01%
140,579
+4,557
+3% +$10.4K
SSB icon
1288
SouthState Bank Corp
SSB
$10.8B
$312K ﹤0.01%
3,159
+417
+15% +$40.9K
PRFZ icon
1289
Invesco FTSE RAFI US 1500 Small-Mid ETF
PRFZ
$2.92B
$312K ﹤0.01%
6,872
+5
+0.1% +$217
STAG icon
1290
STAG Industrial
STAG
$7.12B
$312K ﹤0.01%
8,828
+791
+10% +$28.2K
IWX icon
1291
iShares Russell Top 200 Value ETF
IWX
$4.04B
$311K ﹤0.01%
3,543
– –
SWK icon
1292
Stanley Black & Decker
SWK
$15.4B
$310K ﹤0.01%
4,167
-712
-15% -$52.2K
FDN icon
1293
First Trust Dow Jones Internet Index Fund ETF
FDN
$5.45B
$308K ﹤0.01%
1,102
-595
-35% -$163K
IDA icon
1294
Idacorp
IDA
$8.16B
$308K ﹤0.01%
2,328
+6
+0.3% +$743
SNV
1295
DELISTED
Synovus
SNV
$308K ﹤0.01%
6,266
+19
+0.3% +$974
CCEP icon
1296
Coca-Cola Europacific Partners
CCEP
$47.5B
$306K ﹤0.01%
3,382
-1,033
-23% -$95.8K
ICVT icon
1297
iShares Convertible Bond ETF
ICVT
$7.64B
$305K ﹤0.01%
3,046
+317
+12% +$29.8K
AIT icon
1298
Applied Industrial Technologies
AIT
$13.2B
$304K ﹤0.01%
1,163
+88
+8% +$23.1K
TD icon
1299
Toronto Dominion Bank
TD
$203B
$303K ﹤0.01%
3,796
-962
-20% -$72.2K
IBKR icon
1300
Interactive Brokers
IBKR
$41.4B
$303K ﹤0.01%
4,404
+339
+8% +$21.3K
50 51
52
53 54

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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.