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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 | |
|---|---|---|---|---|---|---|
|
426
EPAM Systems
EPAM
$5.17B
| – | – |
-841,922
| Closed | -$149M |
|
427
JFrog
FROG
$10.4B
| – | – |
-790,759
| Closed | -$34.7M |
|
428
Grid Dynamics Holdings
GDYN
$632M
| – | – |
-1,456,824
| Closed | -$16.8M |
|
429
Galicia Financial Group
GGAL
$7.1B
| – | – |
-1,028,488
| Closed | -$51.8M |
|
430
GitLab
GTLB
$6.89B
| – | – |
-580,752
| Closed | -$26.2M |
|
|
GTLS
431
DELISTED
Chart Industries
GTLS
| – | – |
-4,100
| Closed | -$675K |
|
432
Infosys
INFY
$49.7B
| – | – |
-1,953,985
| Closed | -$36.2M |
|
433
Coca-Cola Femsa
KOF
$23.1B
| – | – |
-57,258
| Closed | -$5.54M |
|
|
LOMA
434
Loma Negra
LOMA
$1.13B
| – | – |
-179,109
| Closed | -$1.96M |
|
435
Mirion Technologies
MIR
$3.79B
| – | – |
-1,005,847
| Closed | -$21.7M |
|
436
Marten Transport
MRTN
$1.22B
| – | – |
-1,320,316
| Closed | -$17.2M |
|
437
NextEra Energy
NEE
$179B
| – | – |
-199,467
| Closed | -$13.8M |
|
438
New Fortress Energy
NFE
$94M
| – | – |
-56,090
| Closed | -$186K |
|
439
Nice
NICE
$5.78B
| – | – |
-550,714
| Closed | -$93M |
|
440
Old Dominion Freight Line
ODFL
$44.1B
| – | – |
-64,485
| Closed | -$10.5M |
|
441
Orion
OEC
$364M
| – | – |
-633,446
| Closed | -$6.64M |
|
442
Oxford Industries
OXM
$538M
| – | – |
-324,789
| Closed | -$13.1M |
|
443
Pampa Energía
PAM
$4.26B
| – | – |
-89,640
| Closed | -$6.22M |
|
444
Pinnacle Financial Partners Inc
PNFP
$16.1B
| – | – |
-263,708
| Closed | -$29.1M |
|
|
PPBI
445
DELISTED
Pacific Premier Bancorp
PPBI
| – | – |
-1,153,528
| Closed | -$24.3M |
|
446
Dr. Reddy's Laboratories
RDY
$10.3B
| – | – |
-365,494
| Closed | -$5.49M |
|
|
RYZ
447
Ryerson Holding Corp
RYZ
$1.5B
| – | – |
-331,475
| Closed | -$7.15M |
|
448
SM Energy
SM
$7.71B
| – | – |
-301,909
| Closed | -$7.46M |
|
449
Atlassian
TEAM
$39.4B
| – | – |
-32,150
| Closed | -$6.53M |
|
|
THS
450
DELISTED
Treehouse Foods
THS
| – | – |
-422,498
| Closed | -$8.2M |
|
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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.