We are live on
!
Find out more
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 | |
|---|---|---|---|---|---|---|
376
Fortive
FTV
$18.6B
| $9.06M | 0.02% |
164,037
-20,432
| -11% | -$1.06M |
|
377
Northrop Grumman
NOC
$81.7B
| $9.05M | 0.02% |
15,869
+320
| +2% | +$186K |
|
378
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.4B
| $9.04M | 0.02% |
393,641
+39,686
| +11% | +$915K |
|
379
Energy Transfer Partners
ET
$70.6B
| $9.03M | 0.02% |
547,665
-4,254
| -0.8% | -$70.8K |
|
380
Vanguard International Dividend Appreciation ETF
VIGI
$9.28B
| $9.01M | 0.02% |
98,490
+1,847
| +2% | +$167K |
|
381
Martin Marietta Materials
MLM
$32.8B
| $9.01M | 0.02% |
14,463
+4,696
| +48% | +$2.92M |
|
382
Donaldson
DCI
$11.2B
| $8.98M | 0.02% |
101,315
+1,689
| +2% | +$147K |
|
383
iShares S&P 500 Value ETF
IVE
$49.9B
| $8.92M | 0.02% |
42,069
+2,833
| +7% | +$594K |
|
384
Nike
NKE
$62.1B
| $8.86M | 0.02% |
139,103
-23,494
| -14% | -$1.53M |
|
385
Marathon Petroleum
MPC
$88.9B
| $8.84M | 0.02% |
54,349
+10,039
| +23% | +$1.88M |
|
386
Kroger
KR
$34.6B
| $8.71M | 0.02% |
139,395
-4,896
| -3% | -$320K |
|
387
Vanguard Ultra-Short Bond ETF
VUSB
$9.33B
| $8.7M | 0.02% |
174,646
-750
| -0.4% | -$37.4K |
|
388
Verra Mobility
VRRM
$728M
| $8.69M | 0.02% |
387,745
-49,410
| -11% | -$1.13M |
|
389
Vanguard Intermediate-Term Bond ETF
BIV
$28.8B
| $8.64M | 0.02% |
110,974
+2,070
| +2% | +$162K |
|
390
VanEck Semiconductor ETF
SMH
$70.8B
| $8.6M | 0.02% |
23,891
-2,658
| -10% | -$933K |
|
391
GE HealthCare
GEHC
$33.1B
| $8.57M | 0.02% |
104,480
-5,138
| -5% | -$400K |
|
392
Axsome Therapeutics
AXSM
$11.5B
| $8.55M | 0.02% |
46,840
-3,237
| -6% | -$452K |
|
393
Targa Resources
TRGP
$56.9B
| $8.52M | 0.02% |
46,198
+6,185
| +15% | +$1.04M |
|
394
iShares Semiconductor ETF
SOXX
$45.3B
| $8.52M | 0.02% |
28,284
-65
| -0.2% | -$19.2K |
|
395
Innovator US Equity Power Buffer ETF February
PFEB
$924M
| $8.5M | 0.02% |
208,668
-12,427
| -6% | -$498K |
|
396
Trane Technologies
TT
$105B
| $8.48M | 0.02% |
21,800
-1,515
| -6% | -$627K |
|
|
ONT
397
Onterris Inc
ONT
$538M
| $8.46M | 0.02% |
340,869
+11,893
| +4% | +$314K |
|
398
Booz Allen Hamilton
BAH
$9.35B
| $8.43M | 0.02% |
99,919
-5,048
| -5% | -$452K |
|
399
iShares 0-5 Year TIPS Bond ETF
STIP
$15.9B
| $8.43M | 0.02% |
82,309
+282
| +0.3% | +$29K |
|
400
Pacer US Cash Cows 100 ETF
COWZ
$19.5B
| $8.39M | 0.02% |
139,499
-8,381
| -6% | -$493K |
|
Similar funds
SAM
VIA
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.