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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
(+8.6%)
Cap. Flow
-$222M
Cap. Flow
% of AUM
-0.62%
Top 10 Holdings %
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
GE Vernova
GEV
|
+$116M |
| 2 |
Boeing
BA
|
+$34M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$31.2M |
| 4 |
NVIDIA
NVDA
|
+$27.5M |
| 5 |
Cloudflare
NET
|
+$26.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
XYZ
Block Inc
XYZ
|
+$79.4M |
| 2 |
Zoetis
ZTS
|
+$41.3M |
| 3 |
Accenture
ACN
|
+$40.8M |
| 4 |
iShares Core S&P Mid-Cap ETF
IJH
|
+$40.7M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
1276
Rayonier
RYN
$6.55B
| $291K | ﹤0.01% |
13,753
+4,448
| +48% | +$102K |
|
1277
Rambus
RMBS
$11B
| $291K | ﹤0.01% |
4,540
| – | – |
|
1278
Middleby
MIDD
$6.08B
| $290K | ﹤0.01% |
2,017
-660
| -25% | -$93K |
|
1279
Invitation Homes
INVH
$18B
| $290K | ﹤0.01% |
8,844
| – | – |
|
|
SNDK
1280
Sandisk
SNDK
$177B
| $290K | ﹤0.01% |
6,384
-101
| -2% | -$3.86K |
|
1281
State Street SPDR MSCI ACWI ex-US ETF
CWI
$2.85B
| $288K | ﹤0.01% |
8,816
+4,758
| +117% | +$146K |
|
1282
BioMarin Pharmaceuticals
BMRN
$12.4B
| $288K | ﹤0.01% |
5,232
+432
| +9% | +$25.4K |
|
1283
MarketAxess Holdings
MKTX
$5.72B
| $287K | ﹤0.01% |
+1,287
| New | +$283K |
|
1284
Elanco Animal Health
ELAN
$11.1B
| $287K | ﹤0.01% |
20,070
-60,350
| -75% | -$705K |
|
1285
Leggett & Platt
LEG
$1.31B
| $285K | ﹤0.01% |
32,000
| – | – |
|
1286
Triple Flag Precious Metals
TFPM
$6.72B
| $284K | ﹤0.01% |
12,000
| – | – |
|
1287
iShares 0-5 Year High Yield Corporate Bond ETF
SHYG
$7.62B
| $284K | ﹤0.01% |
6,589
+4,192
| +175% | +$177K |
|
1288
East-West Bancorp
EWBC
$18B
| $280K | ﹤0.01% |
2,770
-493
| -15% | -$43.7K |
|
1289
Invesco FTSE RAFI US 1500 Small-Mid ETF
PRFZ
$2.89B
| $279K | ﹤0.01% |
6,867
-244
| -3% | -$9.31K |
|
1290
Lincoln Electric
LECO
$15.4B
| $278K | ﹤0.01% |
1,339
-75
| -5% | -$14.3K |
|
1291
Moog Inc Class A
MOG.A
$12.8B
| $276K | ﹤0.01% |
+1,526
| New | +$268K |
|
1292
ON Semiconductor
ON
$31.6B
| $276K | ﹤0.01% |
+5,266
| New | +$229K |
|
1293
Flutter Entertainment
FLUT
$16.4B
| $272K | ﹤0.01% |
953
-34
| -3% | -$8.34K |
|
1294
Wynn Resorts
WYNN
$10.6B
| $272K | ﹤0.01% |
2,907
+1
| +0% | +$85 |
|
1295
Raymond James Financial
RJF
$34B
| $272K | ﹤0.01% |
+1,773
| New | +$254K |
|
1296
NeoGenomics
NEO
$2.13B
| $272K | ﹤0.01% |
37,203
-28,435
| -43% | -$229K |
|
1297
GATX Corp
GATX
$6.27B
| $271K | ﹤0.01% |
+1,764
| New | +$264K |
|
1298
Bahl & Gaynor Small/Mid Cap Income Growth ETF
SMIG
$1.51B
| $271K | ﹤0.01% |
9,378
-2,784
| -23% | -$78.4K |
|
1299
Idacorp
IDA
$8.2B
| $268K | ﹤0.01% |
2,322
+6
| +0.3% | +$695 |
|
1300
MaxLinear
MXL
$6.8B
| $268K | ﹤0.01% |
18,848
-3,908
| -17% | -$45.1K |
|
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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.