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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
-6.4%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
AUM
$35.6B
AUM Growth
-$5.32B
Cap. Flow
-$1.91B
Cap. Flow %
-5.36%
Top 10 Hldgs %
26.78%
Holding
469
New
36
Increased
114
Reduced
269
Closed
46

Top Buys

Rank Stock Value
1
AVGO icon
Broadcom
AVGO
+$515M
2
SE icon
Sea Limited
SE
+$179M
3
TYL icon
Tyler Technologies
TYL
+$177M
4
WAY
Waystar Holding Corp
WAY
+$167M
5
CIEN icon
Ciena
CIEN
+$159M

Top Sells

Rank Stock Value
1
AMD icon
Advanced Micro Devices
AMD
+$229M
2
ACN icon
Accenture
ACN
+$222M
3
PEN icon
Penumbra
PEN
+$210M
4
CF icon
CF Industries
CF
+$201M
5
TXN icon
Texas Instruments
TXN
+$184M

Sector Composition

Rank Sector Weight
1 Technology 32.57%
2 Consumer Discretionary 15.58%
3 Financials 13.1%
4 Healthcare 12.15%
5 Industrials 9.67%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MSFT icon
1
Microsoft
MSFT
$3.71T
$1.55B 4.35%
4,127,203
-303,951
-7% -$124M
NVDA icon
2
NVIDIA
NVDA
$5.42T
$1.32B 3.71%
12,197,638
-1,081,767
-8% -$137M
TSM icon
3
TSMC
TSM
$2.18T
$1.22B 3.43%
7,361,683
-360,357
-5% -$70M
AMZN icon
4
Amazon
AMZN
$2.96T
$1.16B 3.27%
6,118,131
-716,366
-10% -$155M
AAPL icon
5
Apple
AAPL
$4.57T
$1.16B 3.27%
5,239,398
+134,908
+3% +$31.3M
META icon
6
Meta Platforms (Facebook)
META
$1.51T
$906M 2.54%
1,572,230
-91,564
-6% -$59.1M
MA icon
7
Mastercard
MA
$493B
$666M 1.87%
1,215,314
-221,090
-15% -$120M
CG icon
8
Carlyle Group
CG
$17.2B
$531M 1.49%
12,171,478
-1,078,463
-8% -$53.5M
AVGO icon
9
Broadcom
AVGO
$2.04T
$515M 1.45%
3,078,817
+2,431,202
+375% +$515M
MELI icon
10
Mercado Libre
MELI
$92.3B
$499M 1.4%
255,567
-2,909
-1% -$5.77M
SE icon
11
Sea Limited
SE
$69.5B
$480M 1.35%
3,678,011
+1,444,853
+65% +$179M
PRMB
12
Primo Brands
PRMB
$8.54B
$405M 1.14%
11,402,012
+240,142
+2% +$7.84M
CPRT icon
13
Copart
CPRT
$27.5B
$385M 1.08%
6,803,733
+132,309
+2% +$7.45M
ORLY icon
14
O'Reilly Automotive
ORLY
$76.3B
$371M 1.04%
3,882,510
+353,670
+10% +$30.8M
INTU icon
15
Intuit
INTU
$89B
$353M 0.99%
575,615
-7,966
-1% -$4.78M
CMG icon
16
Chipotle Mexican Grill
CMG
$41.5B
$342M 0.96%
6,802,345
+576,614
+9% +$31.4M
COST icon
17
Costco
COST
$420B
$334M 0.94%
353,579
+16,394
+5% +$16M
UNH icon
18
UnitedHealth
UNH
$370B
$327M 0.92%
625,021
-37,754
-6% -$19.3M
LIN icon
19
Linde
LIN
$226B
$322M 0.9%
690,814
-294,590
-30% -$133M
LRN icon
20
Stride
LRN
$3.43B
$293M 0.82%
2,319,593
-147,426
-6% -$18.6M
NOW icon
21
ServiceNow
NOW
$129B
$292M 0.82%
1,834,260
-186,620
-9% -$36M
CRM icon
22
Salesforce
CRM
$158B
$291M 0.82%
1,083,678
-94,188
-8% -$29.3M
YUMC icon
23
Yum China
YUMC
$16.3B
$282M 0.79%
5,423,002
+359,670
+7% +$17.3M
BFAM icon
24
Bright Horizons
BFAM
$3.86B
$281M 0.79%
2,211,097
-159,239
-7% -$19.5M
TRU icon
25
TransUnion
TRU
$15.3B
$278M 0.78%
3,344,290
-26,452
-0.8% -$2.42M
1
2 3 4 5

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William Blair Investment Management's Q1 2025 Portfolio in Review

As of Q1 2025, William Blair Investment Management held 469 positions worth $35.6B, down 13% from $40.9B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair Investment Management withdrew a net $1.91B in Q1 2025, closing 46 positions and reducing 269 holdings. Its most notable exit was Penumbra, an estimated $210M position sold in full.

By sector, the portfolio is most concentrated in Technology at 33% of assets, down from 34% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Waystar Holding Corp worth $158M.

  • William Blair Investment Management's largest Q1 2025 buy was Waystar Holding Corp: 4,227,425 shares worth $158M.
  • William Blair Investment Management added most to Broadcom in Q1 2025, an estimated $515M increase.
  • William Blair Investment Management's biggest Q1 2025 reduction was Advanced Micro Devices, cutting an estimated $229M.
  • William Blair Investment Management fully exited Penumbra in Q1 2025, selling an estimated $210M.
  • William Blair Investment Management's ten largest holdings make up 27% of its $35.6B portfolio in Q1 2025.
  • William Blair Investment Management opened 36 new positions and closed 46 in Q1 2025.
  • William Blair Investment Management's portfolio value fell 13% quarter-over-quarter to $35.6B.

Based on William Blair Investment Management's 13F filing for Q1 2025, filed 9 May 2025.