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William Blair & Company Portfolio holdings
AUM
$38.4B
1-Year Est. Return
25.71%
This Fund
S&P 500
This Quarter
Est. Return
+1.73%
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
$37.3B
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 | |
|---|---|---|---|---|---|---|
926
PPG Industries
PPG
$25.8B
| $1.05M | ﹤0.01% |
10,236
-521
| -5% | -$52.3K |
|
927
Ingersoll Rand
IR
$32.9B
| $1.04M | ﹤0.01% |
13,140
-1,271
| -9% | -$100K |
|
928
Humana
HUM
$45.3B
| $1.04M | ﹤0.01% |
4,048
-332
| -8% | -$87K |
|
929
W.P. Carey
WPC
$16B
| $1.04M | ﹤0.01% |
16,108
-93
| -0.6% | -$6.19K |
|
930
Live Oak Bancshares
LOB
$1.97B
| $1.03M | ﹤0.01% |
+30,082
| New | +$1.01M |
|
931
VanEck High Yield Muni ETF
HYD
$4.4B
| $1.03M | ﹤0.01% |
20,211
-412
| -2% | -$21K |
|
932
Blue Owl Capital
OWL
$18.8B
| $1.03M | ﹤0.01% |
68,883
+16,414
| +31% | +$257K |
|
933
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.41B
| $1.03M | ﹤0.01% |
21,377
+2,405
| +13% | +$115K |
|
934
Clorox
CLX
$13.1B
| $1.03M | ﹤0.01% |
10,199
-2,293
| -18% | -$249K |
|
935
Dentsply Sirona
XRAY
$2.33B
| $1.02M | ﹤0.01% |
89,451
-6,320
| -7% | -$74.2K |
|
936
iShares 7-10 Year Treasury Bond ETF
IEF
$47.1B
| $1.02M | ﹤0.01% |
10,631
-4
| -0% | -$387 |
|
937
Carlyle Group
CG
$17.5B
| $1.02M | ﹤0.01% |
17,248
-3,011
| -15% | -$171K |
|
938
Alkami Technology
ALKT
$2.12B
| $1.01M | ﹤0.01% |
43,976
-19,216
| -30% | -$424K |
|
939
Trade Desk
TTD
$6.43B
| $1.01M | ﹤0.01% |
26,700
-21,554
| -45% | -$955K |
|
940
UFP Industries
UFPI
$5.05B
| $1.01M | ﹤0.01% |
11,066
-559
| -5% | -$51.2K |
|
941
Regeneron Pharmaceuticals
REGN
$82.9B
| $1M | ﹤0.01% |
1,298
+29
| +2% | +$19.7K |
|
|
GRMN
942
Garmin
GRMN
$59.8B
| $1M | ﹤0.01% |
4,938
-1,032
| -17% | -$224K |
|
943
Lattice Semiconductor
LSCC
$18.1B
| $999K | ﹤0.01% |
13,578
-259
| -2% | -$18.4K |
|
944
MeiraGTx Holdings
MGTX
$1.2B
| $997K | ﹤0.01% |
125,400
-7,133
| -5% | -$59.3K |
|
945
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.87B
| $994K | ﹤0.01% |
22,409
-487
| -2% | -$21.4K |
|
946
Robert Half
RHI
$4.32B
| $991K | ﹤0.01% |
36,489
-8,389
| -19% | -$239K |
|
947
Sprouts Farmers Market
SFM
$7.87B
| $988K | ﹤0.01% |
12,399
+1,297
| +12% | +$116K |
|
948
State Street Real Estate Select Sector SPDR ETF
XLRE
$8.5B
| $988K | ﹤0.01% |
24,474
+4,432
| +22% | +$182K |
|
949
NiSource
NI
$19.9B
| $979K | ﹤0.01% |
23,438
+338
| +1% | +$14.4K |
|
950
iShares ESG MSCI USA Leaders ETF
SUSL
$1.21B
| $977K | ﹤0.01% |
8,060
-64
| -0.8% | -$7.65K |
|
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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.