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William Blair Investment Management

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
Cap. Flow
-$3B
Cap. Flow %
-8.37%
Top 10 Hldgs %
32.55%
Holding
459
New
45
Increased
106
Reduced
259
Closed
46

Top Buys

Rank Stock Value
1
SNOW icon
Snowflake
SNOW
+$202M
2
ARGX icon
argenx
ARGX
+$191M
3
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$191M
4
HQY icon
HealthEquity
HQY
+$178M
5
FFIV icon
F5
FFIV
+$148M

Top Sells

Rank Stock Value
1
LRCX icon
Lam Research
LRCX
+$270M
2
CIEN icon
Ciena
CIEN
+$260M
3
UBER icon
Uber
UBER
+$233M
4
LYV icon
Live Nation Entertainment
LYV
+$229M
5
LRN icon
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
MSI icon
326
Motorola Solutions
MSI
$77.7B
$7.87M 0.02%
20,532
+17,627
+607% +$7.08M
AMPX icon
327
Amprius Technologies
AMPX
$1.79B
$7.77M 0.02%
+984,906
New +$11.3M
CRM icon
328
Salesforce
CRM
$158B
$7.67M 0.02%
28,947
-539,419
-95% -$134M
VNET
329
VNET Group
VNET
$2.11B
$7.45M 0.02%
880,195
-663,983
-43% -$6.15M
BX icon
330
Blackstone
BX
$110B
$7.22M 0.02%
46,814
+45,385
+3,176% +$6.9M
PGR icon
331
Progressive
PGR
$121B
$7.06M 0.02%
30,989
+2,290
+8% +$517K
TIGO icon
332
Millicom
TIGO
$16.2B
$6.94M 0.02%
125,175
-3,175
-2% -$160K
JPM icon
333
JPMorgan Chase
JPM
$971B
$6.67M 0.02%
20,709
-9,394
-31% -$2.91M
ABT icon
334
Abbott
ABT
$192B
$5.65M 0.02%
45,135
-1,692
-4% -$216K
ICE icon
335
Intercontinental Exchange
ICE
$85B
$5.43M 0.02%
33,546
-14,982
-31% -$2.35M
BSX icon
336
Boston Scientific
BSX
$74.5B
$4.91M 0.01%
+51,539
New +$5.05M
KEYS icon
337
Keysight
KEYS
$60.6B
$4.81M 0.01%
23,687
+11,530
+95% +$2.14M
TKO icon
338
TKO Group
TKO
$14.3B
$4.77M 0.01%
22,839
-10,357
-31% -$2.01M
V icon
339
Visa
V
$671B
$4.7M 0.01%
+13,400
New +$4.57M
GGG icon
340
Graco
GGG
$13.4B
$4.47M 0.01%
54,506
-24,434
-31% -$2.01M
UBER icon
341
Uber
UBER
$154B
$4.46M 0.01%
54,535
-2,590,339
-98% -$233M
FIGR
342
Figure Technology Solutions
FIGR
$6.78B
$4.34M 0.01%
+106,233
New +$4.25M
AZN icon
343
AstraZeneca
AZN
$246B
$4.33M 0.01%
23,530
+7,124
+43% +$1.25M
MMYT icon
344
MakeMyTrip
MMYT
$5.67B
$4.08M 0.01%
49,652
-728,932
-94% -$59.8M
NFLX icon
345
Netflix
NFLX
$309B
$3.87M 0.01%
41,266
-18,704
-31% -$2.02M
ASML icon
346
ASML
ASML
$695B
$3.69M 0.01%
3,446
+239
+7% +$249K
RYAAY icon
347
Ryanair
RYAAY
$30.8B
$3.67M 0.01%
+50,868
New +$3.31M
LOCO icon
348
El Pollo Loco
LOCO
$463M
$3.44M 0.01%
329,208
-842,027
-72% -$8.7M
ASHR icon
349
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.6B
$2.96M 0.01%
90,037
-11,542
-11% -$379K
TMCI icon
350
Treace Medical Concepts
TMCI
$309M
$2.81M 0.01%
1,145,498
-2,488,883
-68% -$10.8M
12 13
14
15 16

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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.