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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
CPT icon
401
Camden Property Trust
CPT
$10.9B
$284K ﹤0.01%
2,578
-241
-9% -$25.1K
WBS icon
402
Webster Financial
WBS
$12.8B
$270K ﹤0.01%
4,286
– –
INGR icon
403
Ingredion
INGR
$6.54B
$263K ﹤0.01%
2,382
-219
-8% -$24.7K
STAG icon
404
STAG Industrial
STAG
$7.12B
$257K ﹤0.01%
6,991
– –
LKQ icon
405
LKQ Corp
LKQ
$6.25B
$237K ﹤0.01%
7,862
-4,530
-37% -$137K
STT icon
406
State Street
STT
$52.2B
$230K ﹤0.01%
1,780
-394
-18% -$47.2K
AFG icon
407
American Financial Group
AFG
$12B
$224K ﹤0.01%
1,642
-553
-25% -$75.9K
TOL icon
408
Toll Brothers
TOL
$13.9B
$213K ﹤0.01%
1,577
-349
-18% -$47.4K
ETR icon
409
Entergy
ETR
$50.3B
$209K ﹤0.01%
2,258
-499
-18% -$47.3K
WTW icon
410
Willis Towers Watson
WTW
$31.6B
$203K ﹤0.01%
619
-137
-18% -$44.8K
PR
411
Permian Resources
PR
$18B
$196K ﹤0.01%
13,981
-1,039
-7% -$14K
HBAN icon
412
Huntington Bancshares
HBAN
$36.1B
$193K ﹤0.01%
11,115
-174
-2% -$2.85K
GOGO icon
413
Gogo Inc
GOGO
$383M
$122K ﹤0.01%
26,223
-6,041,440
-100% -$44.3M
ACHC icon
414
Acadia Healthcare
ACHC
$2.95B
– –
-9,916
Closed -$246K
AJG icon
415
Arthur J. Gallagher & Co
AJG
$65.5B
– –
-13,511
Closed -$4.18M
ASO icon
416
Academy Sports + Outdoors
ASO
$3.05B
– –
-1,326,270
Closed -$66.3M
BV icon
417
BrightView Holdings
BV
$1.08B
– –
-1,907,869
Closed -$25.6M
BVN icon
418
Compañía de Minas Buenaventura
BVN
$8.79B
– –
-349,743
Closed -$8.51M
CBRL icon
419
Cracker Barrel
CBRL
$1.31B
– –
-268,281
Closed -$11.8M
CBZ icon
420
CBIZ
CBZ
$2.96B
– –
-15,257
Closed -$808K
CFLT
421
DELISTED
Confluent
CFLT
– –
-8,569,807
Closed -$170M
CGNT icon
422
Cognyte Software
CGNT
$675M
– –
-1,343,872
Closed -$11.3M
CHKP icon
423
Check Point Software Technologies
CHKP
$13.2B
– –
-1,067
Closed -$221K
CP icon
424
Canadian Pacific Kansas City
CP
$81.5B
– –
-588,336
Closed -$43.8M
CPNG icon
425
Coupang
CPNG
$29.3B
– –
-2,205,332
Closed -$71M
15 16
17
18 19

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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.