We are live on ! Find out more
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
TNET icon
251
TriNet
TNET
$3.07B
$23.8M 0.07%
402,873
-42,396
-10% -$2.52M
DIOD icon
252
Diodes
DIOD
$4.93B
$23.3M 0.07%
472,125
-49,700
-10% -$2.52M
AWI icon
253
Armstrong World Industries
AWI
$7.75B
$23.3M 0.06%
121,752
-12,301
-9% -$2.35M
TMHC
254
DELISTED
Taylor Morrison
TMHC
$23.2M 0.06%
394,725
-255,498
-39% -$15.6M
VSH icon
255
Vishay Intertechnology
VSH
$5.15B
$23.1M 0.06%
1,594,449
-167,077
-9% -$2.53M
PBF icon
256
PBF Energy
PBF
$8.34B
$22.9M 0.06%
846,054
-86,741
-9% -$2.78M
ESAB icon
257
ESAB
ESAB
$5.35B
$22.9M 0.06%
+205,018
New +$23.5M
SILA
258
DELISTED
Sila Realty Trust
SILA
$22.8M 0.06%
980,180
-101,942
-9% -$2.4M
BGSI
259
Boyd Group Services
BGSI
$2.92B
$22.6M 0.06%
+141,948
New +$22.7M
LOB icon
260
Live Oak Bancshares
LOB
$1.98B
$22.3M 0.06%
+648,561
New +$21.7M
WMT icon
261
Walmart Inc
WMT
$923B
$22M 0.06%
197,209
-121,721
-38% -$13.1M
CARG icon
262
CarGurus
CARG
$3.29B
$21.8M 0.06%
+567,314
New +$20.4M
AR icon
263
Antero Resources
AR
$11.5B
$21.6M 0.06%
626,420
+125,136
+25% +$4.24M
ADTN icon
264
Adtran
ADTN
$665M
$21.5M 0.06%
2,478,621
-257,809
-9% -$2.24M
WH icon
265
Wyndham Hotels & Resorts
WH
$5.49B
$21.1M 0.06%
+279,374
New +$21.1M
WINA icon
266
Winmark
WINA
$1.24B
$21M 0.06%
51,781
-18,854
-27% -$8.07M
VVV icon
267
Valvoline
VVV
$4.25B
$20.3M 0.06%
+699,727
New +$22.5M
YETI icon
268
Yeti Holdings
YETI
$3.85B
$20.3M 0.06%
459,820
-47,600
-9% -$1.83M
CTRI icon
269
Centuri Holdings
CTRI
$2.4B
$20.2M 0.06%
+801,322
New +$17.9M
IAG icon
270
IAMGOLD
IAG
$10.3B
$20.1M 0.06%
1,221,611
-123,224
-9% -$1.74M
MATX icon
271
Matsons
MATX
$6.41B
$20M 0.06%
161,560
-16,595
-9% -$1.78M
ABM icon
272
ABM Industries
ABM
$2.84B
$19.9M 0.06%
471,120
-211,245
-31% -$9.28M
AGX icon
273
Argan
AGX
$8.02B
$19.9M 0.06%
63,361
-8,190
-11% -$2.6M
GEF icon
274
Greif
GEF
$5B
$19.3M 0.05%
285,082
-29,523
-9% -$1.85M
FBNC icon
275
First Bancorp
FBNC
$2.72B
$19.3M 0.05%
379,138
-285,879
-43% -$14.5M
9 10
11
12 13

Similar funds

BAMCO Inc
BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return
GAM
Gotham Asset Management New York $32.7B AUM 27.65% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Hotchkis & Wiley Capital Management
Hotchkis & Wiley Capital Management Los Angeles, California $32.4B AUM 17.21% 1-Year Est. Return
Public Sector Pension Investment Board (PSP Investments)
Public Sector Pension Investment Board (PSP Investments) Montreal, Quebec, Canada $32.1B AUM 31.84% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
Treasurer of the State of North Carolina
Treasurer of the State of North Carolina Raleigh, North Carolina $31.8B AUM 28.93% 1-Year Est. Return

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.