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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
+3.11%
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
$35.9B
AUM Growth
-$2.82B
(-7.3%)
Cap. Flow
-$3B
Cap. Flow
% of AUM
-8.37%
Top 10 Holdings %
Top 10 Hldgs %
32.55%
Holding
459
New
45
Increased
106
Reduced
259
Closed
46
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Snowflake
SNOW
|
+$202M |
| 2 |
argenx
ARGX
|
+$191M |
| 3 |
Alphabet (Google) Class A
GOOGL
|
+$191M |
| 4 |
HealthEquity
HQY
|
+$178M |
| 5 |
F5
FFIV
|
+$148M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Lam Research
LRCX
|
+$270M |
| 2 |
Ciena
CIEN
|
+$260M |
| 3 |
Uber
UBER
|
+$233M |
| 4 |
Live Nation Entertainment
LYV
|
+$229M |
| 5 |
Stride
LRN
|
+$225M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 37.93% |
| 2 | Financials | 12.94% |
| 3 | Healthcare | 12.67% |
| 4 | Consumer Discretionary | 10.8% |
| 5 | Industrials | 9.43% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
Amdocs
DOX
$6.08B
| – | – |
-5,482
| Closed | -$450K |
|
427
Evolent Health
EVH
$471M
| – | – |
-4,035,475
| Closed | -$34.1M |
|
|
EXAS
428
DELISTED
Exact Sciences
EXAS
| – | – |
-2,555,051
| Closed | -$140M |
|
429
Fluor
FLR
$6.96B
| – | – |
-8,268
| Closed | -$348K |
|
430
Fox Factory Holding Corp
FOXF
$913M
| – | – |
-2,151,661
| Closed | -$52.3M |
|
431
FTAI Aviation
FTAI
$23.3B
| – | – |
-902,875
| Closed | -$151M |
|
|
GDEN
432
DELISTED
Golden Entertainment
GDEN
| – | – |
-395,547
| Closed | -$9.33M |
|
433
Hartford Financial Services
HIG
$37.7B
| – | – |
-1,555
| Closed | -$207K |
|
434
Hims & Hers Health
HIMS
$6.99B
| – | – |
-80,035
| Closed | -$4.54M |
|
435
Hewlett Packard
HPE
$77.8B
| – | – |
-9,772
| Closed | -$240K |
|
436
KKR & Co
KKR
$99.5B
| – | – |
-1,773
| Closed | -$230K |
|
437
Kinsale Capital Group
KNSL
$8.51B
| – | – |
-7,144
| Closed | -$3.04M |
|
|
438
Stride
LRN
$3.27B
| – | – |
-1,511,080
| Closed | -$225M |
|
|
439
Live Nation Entertainment
LYV
$43.2B
| – | – |
-1,400,174
| Closed | -$229M |
|
|
ONT
440
Onterris Inc
ONT
$576M
| – | – |
-1,310,251
| Closed | -$36M |
|
441
Monro
MNRO
$359M
| – | – |
-669,478
| Closed | -$12M |
|
442
MGIC Investment
MTG
$6.29B
| – | – |
-515,948
| Closed | -$14.6M |
|
443
Murphy USA
MUSA
$10.1B
| – | – |
-18,550
| Closed | -$7.2M |
|
444
Neogen
NEOG
$2.5B
| – | – |
-5,907,034
| Closed | -$33.7M |
|
445
OneSpaWorld
OSW
$2.7B
| – | – |
-928,271
| Closed | -$19.6M |
|
446
Paylocity
PCTY
$7.73B
| – | – |
-2,474
| Closed | -$394K |
|
447
Pebblebrook Hotel Trust
PEB
$2.04B
| – | – |
-1,678,133
| Closed | -$19.1M |
|
448
Phillips 66
PSX
$90B
| – | – |
-1,513
| Closed | -$206K |
|
449
Signet Jewelers
SIG
$3.59B
| – | – |
-271,136
| Closed | -$26M |
|
450
SiTime
SITM
$20.5B
| – | – |
-83,323
| Closed | -$25.1M |
|
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William Blair Investment Management's Q4 2025 Portfolio in Review
As of Q4 2025, William Blair Investment Management held 459 positions worth $35.9B, down 7.3% from $38.7B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
William Blair Investment Management withdrew a net $3B in Q4 2025, closing 46 positions and reducing 259 holdings. Its most notable exit was Live Nation Entertainment, an estimated $229M position sold in full.
By sector, the portfolio is most concentrated in Technology at 38% of assets, down from 39% a quarter earlier, followed by Financials and Healthcare.
Against the trend, William Blair Investment Management opened a new position in argenx worth $188M.
- William Blair Investment Management's largest Q4 2025 buy was argenx: 223,666 shares worth $188M.
- William Blair Investment Management added most to Snowflake in Q4 2025, an estimated $202M increase.
- William Blair Investment Management's biggest Q4 2025 reduction was Lam Research, cutting an estimated $270M.
- William Blair Investment Management fully exited Live Nation Entertainment in Q4 2025, selling an estimated $229M.
- William Blair Investment Management's ten largest holdings make up 33% of its $35.9B portfolio in Q4 2025.
- William Blair Investment Management opened 45 new positions and closed 46 in Q4 2025.
- William Blair Investment Management's portfolio value fell 7.3% quarter-over-quarter to $35.9B.
Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.