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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 | |
|---|---|---|---|---|---|---|
426
Medtronic
MDT
$116B
| $7.51M | 0.02% |
78,855
-3,824
| -5% | -$352K |
|
427
Ferguson
FERG
$47.4B
| $7.48M | 0.02% |
33,328
-7,850
| -19% | -$1.78M |
|
428
iShares S&P 100 ETF
OEF
$20.4B
| $7.48M | 0.02% |
22,459
+478
| +2% | +$152K |
|
429
StoneX
SNEX
$8.37B
| $7.44M | 0.02% |
165,807
+9,340
| +6% | +$396K |
|
430
Lam Research
LRCX
$408B
| $7.42M | 0.02% |
55,406
+7,495
| +16% | +$794K |
|
431
Jacobs Solutions
J
$17B
| $7.37M | 0.02% |
49,193
-2,338
| -5% | -$336K |
|
432
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.79B
| $7.37M | 0.02% |
185,987
+47,267
| +34% | +$1.82M |
|
433
US Bancorp
USB
$101B
| $7.34M | 0.02% |
151,891
-3,199
| -2% | -$151K |
|
434
Ulta Beauty
ULTA
$22.9B
| $7.31M | 0.02% |
13,373
+574
| +4% | +$294K |
|
435
Texas Pacific Land
TPL
$23.6B
| $7.3M | 0.02% |
23,469
+3
| +0% | +$945 |
|
436
Valero Energy
VLO
$95.1B
| $7.29M | 0.02% |
42,834
+4,047
| +10% | +$604K |
|
437
Hershey
HSY
$37B
| $7.21M | 0.02% |
38,527
+2,242
| +6% | +$407K |
|
438
Prestige Consumer Healthcare
PBH
$2.48B
| $7.15M | 0.02% |
114,559
+618
| +0.5% | +$43K |
|
439
Apollo Global Management
APO
$81.9B
| $7.1M | 0.02% |
53,245
+38,649
| +265% | +$5.47M |
|
440
Republic Services
RSG
$65.6B
| $7.07M | 0.02% |
30,791
-173
| -0.6% | -$40.6K |
|
441
Vertex Pharmaceuticals
VRTX
$133B
| $7.05M | 0.02% |
17,990
-8,087
| -31% | -$3.38M |
|
442
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$23.4B
| $6.96M | 0.02% |
58,084
-5,544
| -9% | -$634K |
|
|
OKLO
443
Oklo
OKLO
$8.39B
| $6.95M | 0.02% |
62,229
+20,689
| +50% | +$1.62M |
|
444
United Rentals
URI
$70.3B
| $6.91M | 0.02% |
7,236
+261
| +4% | +$233K |
|
445
Nutanix
NTNX
$17.5B
| $6.9M | 0.02% |
92,780
-1,375
| -1% | -$101K |
|
446
Symbotic
SYM
$5.35B
| $6.88M | 0.02% |
127,638
-3,681
| -3% | -$186K |
|
|
UCB
447
United Community Banks
UCB
$4.39B
| $6.83M | 0.02% |
217,730
+1,108
| +0.5% | +$35K |
|
448
SiteOne Landscape Supply
SITE
$4.22B
| $6.77M | 0.02% |
52,552
-8,131
| -13% | -$1.1M |
|
449
iShares Russell Mid-Cap Growth ETF
IWP
$21B
| $6.74M | 0.02% |
47,298
-486
| -1% | -$68.7K |
|
450
Atlassian
TEAM
$39.4B
| $6.71M | 0.02% |
42,016
-8,587
| -17% | -$1.55M |
|
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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.