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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
+10.81%
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
$38.7B
AUM Growth
+$994M
Cap. Flow
-$1.59B
Cap. Flow %
-4.12%
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48

Top Buys

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$445M
2
NU icon
Nu Holdings
NU
+$175M
3
BSY icon
Bentley Systems
BSY
+$161M
4
CAVA icon
CAVA Group
CAVA
+$143M
5
SNOW icon
Snowflake
SNOW
+$111M

Top Sells

Rank Stock Value
1
DDOG icon
Datadog
DDOG
+$298M
2
AMZN icon
Amazon
AMZN
+$222M
3
META icon
Meta Platforms (Facebook)
META
+$181M
4
TLN
Talen Energy Corp
TLN
+$152M
5
EPAM icon
EPAM Systems
EPAM
+$149M

Sector Composition

Rank Sector Weight
1 Technology 38.52%
2 Consumer Discretionary 12.99%
3 Financials 12.96%
4 Healthcare 10.56%
5 Industrials 9.02%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MIRM icon
276
Mirum Pharmaceuticals
MIRM
$6.04B
$23M 0.06%
+313,259
New +$19.9M
ESE icon
277
ESCO Technologies
ESE
$7.78B
$22.7M 0.06%
107,501
-72,381
-40% -$14.3M
AL
278
DELISTED
Air Lease Corp
AL
$22.2M 0.06%
348,305
-143,506
-29% -$8.57M
LZB icon
279
La-Z-Boy
LZB
$1.64B
$21.8M 0.06%
636,097
-38,505
-6% -$1.41M
VERX icon
280
Vertex
VERX
$2B
$21.2M 0.05%
854,381
+92,786
+12% +$2.69M
MTDR icon
281
Matador Resources
MTDR
$6.5B
$20.7M 0.05%
459,906
-27,769
-6% -$1.36M
NTST
282
NETSTREIT Corp
NTST
$2.08B
$20.5M 0.05%
+1,134,969
New +$20.5M
KNX icon
283
Knight Transportation
KNX
$11.6B
$20.1M 0.05%
509,919
+503,764
+8,185% +$21.8M
OSW icon
284
OneSpaWorld
OSW
$2.7B
$19.6M 0.05%
928,271
-467,550
-33% -$10.2M
AGX icon
285
Argan
AGX
$8.02B
$19.3M 0.05%
+71,551
New +$16.4M
PEB icon
286
Pebblebrook Hotel Trust
PEB
$2.04B
$19.1M 0.05%
1,678,133
-95,476
-5% -$1.03M
PANW icon
287
Palo Alto Networks
PANW
$315B
$19.1M 0.05%
93,759
-59,972
-39% -$11.5M
GEF icon
288
Greif
GEF
$5B
$18.8M 0.05%
314,605
-20,358
-6% -$1.31M
SHO icon
289
Sunstone Hotel Investors
SHO
$2.01B
$18.6M 0.05%
1,986,295
-120,521
-6% -$1.11M
MATX icon
290
Matsons
MATX
$6.41B
$17.6M 0.05%
178,155
-10,776
-6% -$1.15M
IAG icon
291
IAMGOLD
IAG
$10.3B
$17.4M 0.05%
+1,344,835
New +$11.8M
AUGO
292
Aura Minerals Inc
AUGO
$6.5B
$16.9M 0.04%
+454,212
New +$13M
YETI icon
293
Yeti Holdings
YETI
$3.85B
$16.8M 0.04%
507,420
-30,661
-6% -$1.07M
AR icon
294
Antero Resources
AR
$11.5B
$16.8M 0.04%
501,284
-391,641
-44% -$13.1M
VRNT
295
DELISTED
Verint Systems
VRNT
$16.1M 0.04%
795,681
-448,387
-36% -$9.23M
VNET
296
VNET Group
VNET
$2.11B
$16M 0.04%
+1,544,178
New +$13M
IFS icon
297
Intercorp Financial Services
IFS
$6.09B
$15.2M 0.04%
376,599
+189,065
+101% +$7.31M
GHM icon
298
Graham Corp
GHM
$1.33B
$15M 0.04%
+274,015
New +$14M
HDB icon
299
HDFC Bank
HDB
$119B
$15M 0.04%
439,553
-1,583,863
-78% -$58.4M
EPC icon
300
Edgewell Personal Care
EPC
$1.32B
$14.9M 0.04%
733,889
-44,400
-6% -$1.04M
10 11
12
13 14

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William Blair Investment Management's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.

By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.

  • William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
  • William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
  • William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
  • William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
  • William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
  • William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.