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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
+1.73%
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
$37.3B
AUM Growth
-$310M
(-0.82%)
Cap. Flow
-$212M
Cap. Flow
% of AUM
-0.57%
Top 10 Holdings %
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
BWX Technologies
BWXT
|
+$46.6M |
| 2 |
Meta Platforms (Facebook)
META
|
+$38.3M |
| 3 |
ServiceNow
NOW
|
+$37.6M |
| 4 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$32.4M |
| 5 |
SPDR Gold Trust
GLD
|
+$29.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
FISV
Fiserv Inc
FISV
|
+$114M |
| 2 |
CoStar Group
CSGP
|
+$78.3M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$75.3M |
| 4 |
Pool Corp
POOL
|
+$54M |
| 5 |
Zoetis
ZTS
|
+$51.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 25.8% |
| 2 | Financials | 13.4% |
| 3 | Industrials | 12.04% |
| 4 | Healthcare | 11.22% |
| 5 | Communication Services | 7.63% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1426
Phreesia
PHR
$769M
| $220K | ﹤0.01% |
13,007
-11,781
| -48% | -$243K |
|
1427
Houlihan Lokey
HLI
$8.62B
| $219K | ﹤0.01% |
1,260
+37
| +3% | +$6.79K |
|
1428
Corcept Therapeutics
CORT
$12.3B
| $219K | ﹤0.01% |
6,292
+1,020
| +19% | +$80.1K |
|
1429
Global X Internet of Things ETF
SNSR
$221M
| $218K | ﹤0.01% |
5,907
| – | – |
|
1430
Alamos Gold
AGI
$13.9B
| $218K | ﹤0.01% |
5,651
-7,233
| -56% | -$252K |
|
1431
UGI
UGI
$7.29B
| $216K | ﹤0.01% |
5,783
-833
| -13% | -$29.5K |
|
1432
Tilray
TLRY
$602M
| $216K | ﹤0.01% |
23,965
-107
| -0.4% | -$1.31K |
|
|
OTF
1433
Blue Owl Technology Finance Corp
OTF
$5.22B
| $215K | ﹤0.01% |
14,807
+4,334
| +41% | +$60.8K |
|
1434
National Fuel Gas
NFG
$7.78B
| $215K | ﹤0.01% |
2,687
-30
| -1% | -$2.47K |
|
1435
iShares ESG Screened S&P 500 ETF
XVV
$678M
| $215K | ﹤0.01% |
4,073
| – | – |
|
1436
Ameris Bancorp
ABCB
$5.88B
| $213K | ﹤0.01% |
+2,864
| New | +$213K |
|
1437
Sanofi
SNY
$104B
| $212K | ﹤0.01% |
4,381
-48
| -1% | -$2.38K |
|
1438
Invesco S&P 500 Equal Weight Health Care ETF
RSPH
$794M
| $212K | ﹤0.01% |
6,664
-136
| -2% | -$4.23K |
|
1439
McCormick & Company Voting
MKC.V
$14B
| $212K | ﹤0.01% |
3,121
| – | – |
|
1440
Insight Enterprises
NSIT
$4.54B
| $212K | ﹤0.01% |
2,602
+4
| +0.2% | +$375 |
|
1441
InterDigital
IDCC
$8.99B
| $211K | ﹤0.01% |
663
-303
| -31% | -$107K |
|
1442
Kohl's
KSS
$2.16B
| $211K | ﹤0.01% |
10,331
-7,286
| -41% | -$137K |
|
1443
MACOM Technology Solutions
MTSI
$22.7B
| $211K | ﹤0.01% |
+1,230
| New | +$195K |
|
1444
iShares US Financial Services ETF
IYG
$2.21B
| $211K | ﹤0.01% |
2,282
| – | – |
|
1445
US Foods
USFD
$23.9B
| $210K | ﹤0.01% |
2,789
-3
| -0.1% | -$225 |
|
|
ASGI
1446
abrdn Global Infrastructure Income Fund
ASGI
$757M
| $210K | ﹤0.01% |
+9,392
| New | +$201K |
|
1447
Mine Safety
MSA
$7.45B
| $209K | ﹤0.01% |
+1,308
| New | +$213K |
|
1448
iShares MSCI Taiwan ETF
EWT
$11B
| $209K | ﹤0.01% |
3,295
-30
| -0.9% | -$1.93K |
|
1449
PG&E
PCG
$37.5B
| $208K | ﹤0.01% |
12,962
+2,816
| +28% | +$45K |
|
1450
Illumina
ILMN
$29B
| $207K | ﹤0.01% |
1,581
-1,421
| -47% | -$167K |
|
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William Blair & Company's Q4 2025 Portfolio in Review
As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.
William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.
By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
- William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
- William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
- William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
- William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
- William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
- William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.
Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.