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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
+7.16%
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
$37.6B
AUM Growth
+$1.57B
(+4.4%)
Cap. Flow
-$160M
Cap. Flow
% of AUM
-0.43%
Top 10 Holdings %
Top 10 Hldgs %
26.02%
Holding
1,919
New
98
Increased
697
Reduced
774
Closed
75
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Meta Platforms (Facebook)
META
|
+$76.1M |
| 2 |
Applovin
APP
|
+$75.3M |
| 3 |
ServiceNow
NOW
|
+$66.6M |
| 4 |
CWAN
Clearwater Analytics
CWAN
|
+$65.8M |
| 5 |
Diamondback Energy
FANG
|
+$30.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
CYBR
CyberArk
CYBR
|
+$70.7M |
| 2 |
Adobe
ADBE
|
+$61.7M |
| 3 |
Microsoft
MSFT
|
+$45.7M |
| 4 |
Workday
WDAY
|
+$42.6M |
| 5 |
Pool Corp
POOL
|
+$41.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 27.36% |
| 2 | Financials | 13.36% |
| 3 | Industrials | 12.59% |
| 4 | Healthcare | 10.97% |
| 5 | Consumer Discretionary | 7.45% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
Targa Resources
TRGP
$57.3B
| $6.7M | 0.02% |
40,013
+9,940
| +33% | +$1.66M |
|
452
D.R. Horton
DHI
$41.5B
| $6.67M | 0.02% |
39,356
+3,703
| +10% | +$582K |
|
453
iShares US Medical Devices ETF
IHI
$3.49B
| $6.63M | 0.02% |
110,285
-1,242
| -1% | -$76K |
|
454
Klaviyo
KVYO
$4.98B
| $6.61M | 0.02% |
238,776
-6,479
| -3% | -$209K |
|
455
Thryv Holdings
THRY
$95.5M
| $6.6M | 0.02% |
547,418
+91,361
| +20% | +$1.16M |
|
456
Cencora
COR
$59.8B
| $6.6M | 0.02% |
21,119
-2
| -0% | -$589 |
|
457
Schwab US Large-Cap Growth ETF
SCHG
$63.1B
| $6.57M | 0.02% |
206,008
+47,106
| +30% | +$1.44M |
|
458
MetLife
MET
$61.8B
| $6.5M | 0.02% |
78,883
-25
| -0% | -$1.97K |
|
459
Comcast
CMCSA
$91.9B
| $6.45M | 0.02% |
205,203
-32,714
| -14% | -$1.1M |
|
460
Transmedics
TMDX
$3.05B
| $6.45M | 0.02% |
57,443
-11,044
| -16% | -$1.29M |
|
461
Strategy Inc
MSTR
$38.2B
| $6.44M | 0.02% |
19,975
+879
| +5% | +$326K |
|
462
Kornit Digital
KRNT
$850M
| $6.4M | 0.02% |
474,427
-45,147
| -9% | -$767K |
|
463
Capital Group Core Equity ETF
CGUS
$11.9B
| $6.38M | 0.02% |
161,434
+2,031
| +1% | +$78K |
|
464
Snowflake
SNOW
$117B
| $6.37M | 0.02% |
28,249
+1,109
| +4% | +$238K |
|
465
Vanguard S&P 500 Value ETF
VOOV
$6.79B
| $6.35M | 0.02% |
31,814
+4,864
| +18% | +$944K |
|
466
Invesco S&P MidCap Momentum ETF
XMMO
$7.62B
| $6.26M | 0.02% |
46,269
+4,472
| +11% | +$589K |
|
467
Qualys
QLYS
$6.59B
| $6.25M | 0.02% |
47,263
+2,000
| +4% | +$271K |
|
468
Unilever
UL
$134B
| $6.24M | 0.02% |
93,550
-2,807
| -3% | -$194K |
|
469
General Mills
GIS
$20.8B
| $6.23M | 0.02% |
123,624
+5,131
| +4% | +$257K |
|
470
Mercury Systems
MRCY
$6.56B
| $6.23M | 0.02% |
80,520
-44,527
| -36% | -$2.77M |
|
471
iShares US Technology ETF
IYW
$25.7B
| $6.17M | 0.02% |
31,487
-154
| -0.5% | -$28.2K |
|
472
Martin Marietta Materials
MLM
$32.7B
| $6.16M | 0.02% |
9,767
+85
| +0.9% | +$50.7K |
|
473
Invesco FTSE RAFI US 1000 ETF
PRF
$10.1B
| $6.11M | 0.02% |
135,154
-483
| -0.4% | -$21.1K |
|
474
FedEx
FDX
$77.9B
| $6.09M | 0.02% |
25,813
-744
| -3% | -$172K |
|
475
Axsome Therapeutics
AXSM
$11.3B
| $6.08M | 0.02% |
50,077
+595
| +1% | +$67K |
|
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William Blair & Company's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair & Company held 1,919 positions worth $37.6B, up 4.4% from $36B the previous quarter. Its ten largest holdings account for 26% of the portfolio.
William Blair & Company's Q3 2025 filing shows 98 new, 697 increased, 774 reduced and 75 closed positions. Its largest new stake was Miami International Holdings: 363,765 shares worth $14.6M. The largest sale was CyberArk, an estimated $70.7M.
By sector, the portfolio is most concentrated in Technology at 27% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.
- William Blair & Company's largest Q3 2025 buy was Miami International Holdings: 363,765 shares worth $14.6M.
- William Blair & Company added most to Meta Platforms (Facebook) in Q3 2025, an estimated $76.1M increase.
- William Blair & Company's biggest Q3 2025 reduction was CyberArk, cutting an estimated $70.7M.
- William Blair & Company fully exited Stride in Q3 2025, selling an estimated $7.47M.
- William Blair & Company's ten largest holdings make up 26% of its $37.6B portfolio in Q3 2025.
- William Blair & Company opened 98 new positions and closed 75 in Q3 2025.
- William Blair & Company's portfolio value rose 4.4% quarter-over-quarter to $37.6B.
Based on William Blair & Company's 13F filing for Q3 2025, filed 12 Nov 2025.