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William Blair Investment Management Portfolio holdings
AUM
$30.3B
1-Year Est. Return
33.75%
This Fund
S&P 500
This Quarter
Est. Return
-0.1%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+771.69%
AUM
$30.3B
AUM Growth
-$5.59B
(-16%)
Cap. Flow
-$4.09B
Cap. Flow
% of AUM
-13.52%
Top 10 Holdings %
Top 10 Hldgs %
30.62%
Holding
459
New
46
Increased
157
Reduced
205
Closed
46
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
AstraZeneca
AZN
|
+$370M |
| 2 |
Akamai
AKAM
|
+$162M |
| 3 |
BorgWarner
BWA
|
+$152M |
| 4 |
Amphenol
APH
|
+$152M |
| 5 |
Synaptics
SYNA
|
+$129M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$309M |
| 2 |
Sea Limited
SE
|
+$302M |
| 3 |
Amazon
AMZN
|
+$269M |
| 4 |
Microsoft
MSFT
|
+$248M |
| 5 |
Ciena
CIEN
|
+$214M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 36.13% |
| 2 | Healthcare | 12.59% |
| 3 | Industrials | 11.81% |
| 4 | Financials | 11.55% |
| 5 | Consumer Discretionary | 10.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
401
Ingredion
INGR
$6.4B
| $275K | ﹤0.01% |
2,442
+60
| +3% | +$6.89K |
|
402
Entergy
ETR
$53.1B
| $260K | ﹤0.01% |
2,316
+58
| +3% | +$5.83K |
|
403
STAG Industrial
STAG
$7.77B
| $259K | ﹤0.01% |
7,176
+185
| +3% | +$7.01K |
|
404
Camden Property Trust
CPT
$11.2B
| $259K | ﹤0.01% |
2,647
+69
| +3% | +$7.32K |
|
405
Accenture
ACN
$94.3B
| $250K | ﹤0.01% |
1,260
-30
| -2% | -$6.99K |
|
406
STMicroelectronics
STM
$47.7B
| $240K | ﹤0.01% |
+6,936
| New | +$217K |
|
407
Phillips 66
PSX
$83.3B
| $231K | ﹤0.01% |
+1,270
| New | +$199K |
|
408
State Street
STT
$50.7B
| $231K | ﹤0.01% |
1,826
+46
| +3% | +$5.88K |
|
409
Toll Brothers
TOL
$14.1B
| $221K | ﹤0.01% |
1,617
+40
| +3% | +$5.87K |
|
410
American Financial Group
AFG
$12B
| $215K | ﹤0.01% |
1,683
+41
| +2% | +$5.33K |
|
411
Willis Towers Watson
WTW
$28.6B
| $207K | ﹤0.01% |
712
+93
| +15% | +$28.5K |
|
412
Huntington Bancshares
HBAN
$34.7B
| $178K | ﹤0.01% |
11,398
+283
| +3% | +$4.83K |
|
413
iShares Russell 2000 Value ETF
IWN
$14.4B
| $95.2K | ﹤0.01% |
502
-3,319
| -87% | -$642K |
|
414
ADMA Biologics
ADMA
$1.97B
| – | – |
-890,861
| Closed | -$16.2M |
|
|
AL
415
DELISTED
Air Lease Corp
AL
| – | – |
-139,279
| Closed | -$8.95M |
|
416
Atour Lifestyle Holdings
ATAT
$4.56B
| – | – |
-255,330
| Closed | -$10.1M |
|
417
Armstrong World Industries
AWI
$7.05B
| – | – |
-121,752
| Closed | -$23.3M |
|
418
Axalta
AXTA
$7.22B
| – | – |
-13,034
| Closed | -$421K |
|
419
Brookfield Asset Management
BAM
$75.9B
| – | – |
-1,835,120
| Closed | -$96.1M |
|
|
CADE
420
DELISTED
Cadence Bank
CADE
| – | – |
-2,137,482
| Closed | -$91.6M |
|
421
Ceco Environmental
CECO
$4.31B
| – | – |
-706,273
| Closed | -$42.3M |
|
422
Cellebrite
CLBT
$3.65B
| – | – |
-474,015
| Closed | -$8.55M |
|
|
CSGS
423
DELISTED
CSG Systems International
CSGS
| – | – |
-12,766
| Closed | -$979K |
|
424
CareTrust REIT
CTRE
$10.1B
| – | – |
-835,850
| Closed | -$30.2M |
|
|
CWAN
425
DELISTED
Clearwater Analytics
CWAN
| – | – |
-5,880,506
| Closed | -$142M |
|
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William Blair Investment Management's Q1 2026 Portfolio in Review
As of Q1 2026, William Blair Investment Management held 459 positions worth $30.3B, down 16% from $35.9B the previous quarter. Its ten largest holdings account for 31% of the portfolio.
William Blair Investment Management withdrew a net $4.09B in Q1 2026, closing 46 positions and reducing 205 holdings. Its most notable exit was Sea Limited, an estimated $302M position sold in full.
By sector, the portfolio is most concentrated in Technology at 36% of assets, down from 38% a quarter earlier, followed by Healthcare and Industrials.
Against the trend, William Blair Investment Management opened a new position in Akamai worth $186M.
- William Blair Investment Management's largest Q1 2026 buy was Akamai: 1,619,060 shares worth $186M.
- William Blair Investment Management added most to AstraZeneca in Q1 2026, an estimated $370M increase.
- William Blair Investment Management's biggest Q1 2026 reduction was NVIDIA, cutting an estimated $309M.
- William Blair Investment Management fully exited Sea Limited in Q1 2026, selling an estimated $302M.
- William Blair Investment Management's ten largest holdings make up 31% of its $30.3B portfolio in Q1 2026.
- William Blair Investment Management opened 46 new positions and closed 46 in Q1 2026.
- William Blair Investment Management's portfolio value fell 16% quarter-over-quarter to $30.3B.
Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.