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William Blair Investment Management Portfolio holdings
AUM
$33.3B
1-Year Est. Return
44.76%
This Fund
S&P 500
This Quarter
Est. Return
+10.81%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+978.6%
AUM
$38.7B
AUM Growth
+$994M
(+2.6%)
Cap. Flow
-$1.59B
Cap. Flow
% of AUM
-4.12%
Top 10 Holdings %
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$445M |
| 2 |
Nu Holdings
NU
|
+$175M |
| 3 |
Bentley Systems
BSY
|
+$161M |
| 4 |
CAVA Group
CAVA
|
+$143M |
| 5 |
Snowflake
SNOW
|
+$111M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Datadog
DDOG
|
+$298M |
| 2 |
Amazon
AMZN
|
+$222M |
| 3 |
Meta Platforms (Facebook)
META
|
+$181M |
| 4 |
TLN
Talen Energy Corp
TLN
|
+$152M |
| 5 |
EPAM Systems
EPAM
|
+$149M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 38.52% |
| 2 | Consumer Discretionary | 12.99% |
| 3 | Financials | 12.96% |
| 4 | Healthcare | 10.56% |
| 5 | Industrials | 9.02% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
401
STAG Industrial
STAG
$7.16B
| $247K | ﹤0.01% |
6,991
-347
| -5% | -$12.4K |
|
402
Acadia Healthcare
ACHC
$2.9B
| $246K | ﹤0.01% |
9,916
-13,393
| -57% | -$299K |
|
403
Blackstone
BX
$110B
| $244K | ﹤0.01% |
+1,429
| New | +$245K |
|
404
Hewlett Packard
HPE
$81.6B
| $240K | ﹤0.01% |
9,772
-114
| -1% | -$2.52K |
|
405
Vertex Pharmaceuticals
VRTX
$133B
| $233K | ﹤0.01% |
596
-22,012
| -97% | -$9.2M |
|
406
STMicroelectronics
STM
$49.2B
| $233K | ﹤0.01% |
8,259
-96
| -1% | -$2.68K |
|
407
KKR & Co
KKR
$101B
| $230K | ﹤0.01% |
1,773
-21
| -1% | -$2.98K |
|
408
VICI Properties
VICI
$29B
| $223K | ﹤0.01% |
6,844
-80
| -1% | -$2.64K |
|
409
Check Point Software Technologies
CHKP
$13.3B
| $221K | ﹤0.01% |
+1,067
| New | +$215K |
|
410
Hartford Financial Services
HIG
$37.5B
| $207K | ﹤0.01% |
+1,555
| New | +$199K |
|
411
Phillips 66
PSX
$91.1B
| $206K | ﹤0.01% |
+1,513
| New | +$194K |
|
412
Huntington Bancshares
HBAN
$36B
| $195K | ﹤0.01% |
11,289
-132
| -1% | -$2.26K |
|
|
PR
413
Permian Resources
PR
$17.7B
| $192K | ﹤0.01% |
15,020
-555
| -4% | -$7.61K |
|
414
ZipRecruiter
ZIP
$367M
| $106K | ﹤0.01% |
25,034
-3,627,422
| -99% | -$17M |
|
415
ADT
ADT
$5.33B
| – | – |
-2,566,675
| Closed | -$21.7M |
|
416
AGCO
AGCO
$7.03B
| – | – |
-2,842
| Closed | -$293K |
|
417
Avantor
AVTR
$9.35B
| – | – |
-22,225
| Closed | -$299K |
|
418
BBVA Argentina
BBAR
$3.22B
| – | – |
-333,654
| Closed | -$5.49M |
|
|
BPMC
419
DELISTED
Blueprint Medicines
BPMC
| – | – |
-8,574
| Closed | -$1.1M |
|
420
Banco Santander Chile
BSAC
$16B
| – | – |
-169,653
| Closed | -$4.28M |
|
421
Burlington
BURL
$22.2B
| – | – |
-317,729
| Closed | -$73.9M |
|
422
Cheesecake Factory
CAKE
$5.74B
| – | – |
-452,955
| Closed | -$28.4M |
|
423
Carrier Global
CARR
$52B
| – | – |
-105,864
| Closed | -$7.75M |
|
424
Chubb
CB
$132B
| – | – |
-267,172
| Closed | -$77.4M |
|
425
Vita Coco
COCO
$3.83B
| – | – |
-207,066
| Closed | -$7.48M |
|
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William Blair Investment Management's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.
William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.
Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.
- William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
- William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
- William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
- William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
- William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
- William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
- William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.
Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.