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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 | |
|---|---|---|---|---|---|---|
601
Digital Realty Trust
DLR
$70.8B
| $3.64M | 0.01% |
23,517
-2,805
| -11% | -$461K |
|
602
Realty Income
O
$58.6B
| $3.57M | 0.01% |
63,372
+29,698
| +88% | +$1.72M |
|
603
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$55.2B
| $3.54M | 0.01% |
33,185
-2,625
| -7% | -$278K |
|
604
JPMorgan BetaBuilders Japan ETF
BBJP
$18.7B
| $3.52M | 0.01% |
53,451
+20,194
| +61% | +$1.37M |
|
605
Vanguard Health Care ETF
VHT
$19B
| $3.52M | 0.01% |
12,217
-131
| -1% | -$36.6K |
|
606
T-Mobile US
TMUS
$191B
| $3.51M | 0.01% |
17,283
+2,535
| +17% | +$537K |
|
607
Dick's Sporting Goods
DKS
$19.2B
| $3.46M | 0.01% |
17,465
+1,011
| +6% | +$221K |
|
608
VanEck Morningstar Wide Moat ETF
MOAT
$12.4B
| $3.46M | 0.01% |
33,378
-2,183
| -6% | -$223K |
|
609
Neurogene
NGNE
$729M
| $3.37M | 0.01% |
163,655
+21,835
| +15% | +$544K |
|
610
WillScot Mobile Mini Holdings
WSC
$4.18B
| $3.36M | 0.01% |
178,433
-2,914
| -2% | -$58.8K |
|
611
Five Below
FIVE
$13B
| $3.35M | 0.01% |
17,774
-11,488
| -39% | -$1.87M |
|
612
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$19.8B
| $3.33M | 0.01% |
67,256
+2,118
| +3% | +$106K |
|
613
C.H. Robinson
CHRW
$17.3B
| $3.31M | 0.01% |
20,616
+578
| +3% | +$85.4K |
|
614
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$41.4B
| $3.31M | 0.01% |
74,507
+6,799
| +10% | +$297K |
|
615
Innovator US Small Cap Power Buffer ETF April
KAPR
$218M
| $3.31M | 0.01% |
94,172
-3,928
| -4% | -$136K |
|
616
iShares S&P Mid-Cap 400 Growth ETF
IJK
$11.1B
| $3.3M | 0.01% |
34,046
+4,112
| +14% | +$396K |
|
617
iShares Russell Top 200 Growth ETF
IWY
$16.5B
| $3.28M | 0.01% |
11,826
-2,372
| -17% | -$657K |
|
618
Sterling Infrastructure
STRL
$16.2B
| $3.26M | 0.01% |
10,660
-96
| -0.9% | -$33.1K |
|
619
Western Digital
WDC
$151B
| $3.26M | 0.01% |
18,919
-218
| -1% | -$33.1K |
|
620
Canadian National Railway
CNI
$75.7B
| $3.26M | 0.01% |
32,949
-372
| -1% | -$35.8K |
|
621
GitLab
GTLB
$6.88B
| $3.24M | 0.01% |
86,380
-12,546
| -13% | -$543K |
|
622
Kadant
KAI
$3.94B
| $3.22M | 0.01% |
11,284
-439
| -4% | -$125K |
|
623
WEX
WEX
$6.35B
| $3.2M | 0.01% |
21,504
-1,322
| -6% | -$199K |
|
624
ProShares Ultra Semiconductors
USD
$2.8B
| $3.17M | 0.01% |
60,282
-220
| -0.4% | -$11.7K |
|
625
Royal Bank of Canada
RY
$293B
| $3.16M | 0.01% |
18,553
-175
| -0.9% | -$26.9K |
|
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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.