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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
+15.93%
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
$34.4B
AUM Growth
+$4.27B
Cap. Flow
+$63.7M
Cap. Flow %
0.19%
Top 10 Hldgs %
22.06%
Holding
433
New
35
Increased
127
Reduced
244
Closed
27

Top Buys

Rank Stock Value
1
PDD icon
Pinduoduo
PDD
+$279M
2
CRH icon
CRH
CRH
+$151M
3
CWAN
Clearwater Analytics
CWAN
+$143M
4
EXLS icon
EXL Service
EXLS
+$102M
5
A icon
Agilent Technologies
A
+$76.4M

Top Sells

Rank Stock Value
1
PFGC icon
Performance Food Group
PFGC
+$156M
2
PXD
Pioneer Natural Resource Co.
PXD
+$101M
3
CP icon
Canadian Pacific Kansas City
CP
+$97.2M
4
WOLF icon
Wolfspeed
WOLF
+$86.6M
5
AXON
Axon Enterprise
AXON
+$79.8M

Sector Composition

Rank Sector Weight
1 Technology 27.13%
2 Healthcare 15.5%
3 Consumer Discretionary 15.19%
4 Industrials 14.17%
5 Financials 9.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WMS icon
51
Advanced Drainage Systems
WMS
$10.5B
$195M 0.57%
1,388,065
-57,261
-4% -$6.9M
WAL icon
52
Western Alliance Bancorporation
WAL
$8.96B
$194M 0.56%
2,949,534
-493,865
-14% -$24.9M
BFAM icon
53
Bright Horizons
BFAM
$3.75B
$191M 0.56%
2,031,419
+118,227
+6% +$10.1M
LRCX icon
54
Lam Research
LRCX
$412B
$191M 0.56%
2,443,960
+163,060
+7% +$11.1M
PEN icon
55
Penumbra
PEN
$12.8B
$187M 0.54%
743,259
+86,295
+13% +$19.1M
GTLS
56
DELISTED
Chart Industries
GTLS
$183M 0.53%
1,344,015
-352,396
-21% -$47.6M
TW icon
57
Tradeweb Markets
TW
$21.9B
$177M 0.51%
1,945,578
-331,584
-15% -$29.6M
TYL icon
58
Tyler Technologies
TYL
$13B
$176M 0.51%
420,045
-17,167
-4% -$6.86M
CCJ icon
59
Cameco
CCJ
$43.2B
$176M 0.51%
4,074,090
-837,929
-17% -$35.1M
TD icon
60
Toronto Dominion Bank
TD
$203B
$175M 0.51%
2,703,696
-100,078
-4% -$6M
CRH icon
61
CRH
CRH
$65.6B
$174M 0.51%
2,521,385
+2,508,677
+19,741% +$151M
CF icon
62
CF Industries
CF
$17.7B
$174M 0.51%
2,185,788
-705,887
-24% -$56.2M
TECH icon
63
Bio-Techne
TECH
$11.2B
$172M 0.5%
2,234,998
-79,271
-3% -$5.22M
VIRT icon
64
Virtu Financial
VIRT
$4.97B
$168M 0.49%
8,281,950
-65,361
-0.8% -$1.21M
ORLY icon
65
O'Reilly Automotive
ORLY
$74.3B
$167M 0.49%
2,634,825
-24,060
-0.9% -$1.52M
TREX icon
66
Trex
TREX
$5B
$167M 0.49%
2,013,355
-105,443
-5% -$6.99M
MLM icon
67
Martin Marietta Materials
MLM
$32.6B
$166M 0.48%
332,389
+130,557
+65% +$58.8M
FOLD
68
DELISTED
Amicus Therapeutics
FOLD
$165M 0.48%
11,647,026
+1,270,263
+12% +$14.4M
INSP icon
69
Inspire Medical Systems
INSP
$1.68B
$164M 0.48%
806,947
+112,802
+16% +$18.3M
APO icon
70
Apollo Global Management
APO
$81.4B
$164M 0.48%
1,756,502
-146,470
-8% -$12.9M
TXN icon
71
Texas Instruments
TXN
$253B
$163M 0.48%
957,654
+404,039
+73% +$62.6M
RGEN icon
72
Repligen
RGEN
$9.36B
$163M 0.47%
905,760
-41,133
-4% -$6.4M
NOVT icon
73
Novanta
NOVT
$6.35B
$163M 0.47%
966,688
-4,473
-0.5% -$652K
ALRM icon
74
Alarm.com
ALRM
$2.73B
$162M 0.47%
2,499,896
-35,300
-1% -$2.02M
BPMC
75
DELISTED
Blueprint Medicines
BPMC
$159M 0.46%
1,727,845
+271,216
+19% +$17.6M
1 2
3
4 5

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William Blair Investment Management's Q4 2023 Portfolio in Review

As of Q4 2023, William Blair Investment Management held 433 positions worth $34.4B, up 14% from $30.1B the previous quarter. Its ten largest holdings account for 22% of the portfolio.

William Blair Investment Management's Q4 2023 filing shows 35 new, 127 increased, 244 reduced and 27 closed positions. Its largest new stake was Pinduoduo: 2,300,793 shares worth $336M. The largest sale was Performance Food Group, an estimated $156M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • William Blair Investment Management's largest Q4 2023 buy was Pinduoduo: 2,300,793 shares worth $336M.
  • William Blair Investment Management added most to CRH in Q4 2023, an estimated $151M increase.
  • William Blair Investment Management's biggest Q4 2023 reduction was Performance Food Group, cutting an estimated $156M.
  • William Blair Investment Management fully exited Pioneer Natural Resource Co. in Q4 2023, selling an estimated $101M.
  • William Blair Investment Management's ten largest holdings make up 22% of its $34.4B portfolio in Q4 2023.
  • William Blair Investment Management opened 35 new positions and closed 27 in Q4 2023.
  • William Blair Investment Management's portfolio value rose 14% quarter-over-quarter to $34.4B.

Based on William Blair Investment Management's 13F filing for Q4 2023, filed 9 Feb 2024.