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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+14.12%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$29.3B
AUM Growth
+$3.27B
Cap. Flow
-$91M
Cap. Flow %
-0.31%
Top 10 Hldgs %
24.41%
Holding
1,872
New
83
Increased
624
Reduced
816
Closed
87

Top Buys

Rank Stock Value
1
GWRE icon
Guidewire Software
GWRE
+$37.5M
2
SCHW
Charles Schwab
SCHW
+$37.1M
3
VLTO icon
Veralto
VLTO
+$17.1M
4
VRTX icon
Vertex Pharmaceuticals
VRTX
+$16.7M
5
CSGP icon
CoStar Group
CSGP
+$16.3M

Top Sells

Rank Stock Value
1
DHR icon
Danaher
DHR
+$37.6M
2
IRTC icon
iRhythm Holdings
IRTC
+$26.7M
3
DE icon
Deere & Co
DE
+$22.6M
4
TOST icon
Toast
TOST
+$21.2M
5
KO icon
Coca-Cola
KO
+$20.3M

Sector Composition

Rank Sector Weight
1 Technology 26.35%
2 Healthcare 17.08%
3 Financials 12.09%
4 Industrials 11.7%
5 Consumer Discretionary 8.53%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IWO icon
326
iShares Russell 2000 Growth ETF
IWO
$15B
$9.69M 0.03%
38,431
+5,638
+17% +$1.27M
AMK
327
DELISTED
AssetMark Financial Holdings, Inc.
AMK
$9.66M 0.03%
322,494
+48,337
+18% +$1.24M
SITE icon
328
SiteOne Landscape Supply
SITE
$4.22B
$9.63M 0.03%
59,285
-1,076
-2% -$157K
RCL icon
329
Royal Caribbean
RCL
$82.4B
$9.62M 0.03%
74,314
+70,054
+1,644% +$7.14M
FUSN
330
DELISTED
Fusion Pharmaceuticals Inc. Common Shares
FUSN
$9.55M 0.03%
+993,855
New +$4.83M
HUM icon
331
Humana
HUM
$46.7B
$9.54M 0.03%
20,849
+4,608
+28% +$2.27M
MMM icon
332
3M
MMM
$94.8B
$9.44M 0.03%
103,332
-6,610
-6% -$530K
XBI icon
333
State Street SPDR S&P Biotech ETF
XBI
$10.5B
$9.42M 0.03%
105,509
-2,159
-2% -$160K
KNSL icon
334
Kinsale Capital Group
KNSL
$8.51B
$9.31M 0.03%
27,799
-1,603
-5% -$595K
TECH icon
335
Bio-Techne
TECH
$11.3B
$9.31M 0.03%
120,603
-230
-0.2% -$15.1K
BKNG icon
336
Booking.com
BKNG
$159B
$9.3M 0.03%
65,575
+2,125
+3% +$265K
GPN icon
337
Global Payments
GPN
$23.4B
$9.26M 0.03%
72,929
+5,098
+8% +$590K
BL icon
338
BlackLine
BL
$1.65B
$9.26M 0.03%
148,256
-125,181
-46% -$7.08M
T icon
339
AT&T
T
$166B
$9.21M 0.03%
549,102
-73,190
-12% -$1.16M
SLB icon
340
SLB Ltd
SLB
$78.1B
$9.05M 0.03%
173,839
-4,307
-2% -$234K
DUK icon
341
Duke Energy
DUK
$96.3B
$8.91M 0.03%
91,818
-7,512
-8% -$683K
IWN icon
342
iShares Russell 2000 Value ETF
IWN
$14.6B
$8.86M 0.03%
57,064
+4,266
+8% +$591K
ADI icon
343
Analog Devices
ADI
$187B
$8.73M 0.03%
43,947
-74
-0.2% -$13.2K
GIS icon
344
General Mills
GIS
$20.4B
$8.71M 0.03%
133,656
-5,211
-4% -$336K
PLMR icon
345
Palomar
PLMR
$3.36B
$8.65M 0.03%
155,784
-14,519
-9% -$812K
NVS icon
346
Novartis
NVS
$290B
$8.61M 0.03%
85,251
+560
+0.7% +$54.1K
OPCH icon
347
Option Care Health
OPCH
$3.57B
$8.58M 0.03%
254,822
-15,038
-6% -$462K
CNI icon
348
Canadian National Railway
CNI
$76.4B
$8.57M 0.03%
68,188
-862
-1% -$97.6K
TIP icon
349
iShares TIPS Bond ETF
TIP
$14.7B
$8.56M 0.03%
79,631
-89,825
-53% -$9.39M
CRSP icon
350
CRISPR Therapeutics
CRSP
$5.22B
$8.56M 0.03%
136,700
+3,814
+3% +$211K
12 13
14
15 16

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William Blair & Company's Q4 2023 Portfolio in Review

As of Q4 2023, William Blair & Company held 1,872 positions worth $29.3B, up 13% from $26.1B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q4 2023 filing shows 83 new, 624 increased, 816 reduced and 87 closed positions. Its largest new stake was Veralto: 229,539 shares worth $18.9M. The largest sale was Danaher, an estimated $37.6M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 25% a quarter earlier, followed by Healthcare and Financials.

  • William Blair & Company's largest Q4 2023 buy was Veralto: 229,539 shares worth $18.9M.
  • William Blair & Company added most to Guidewire Software in Q4 2023, an estimated $37.5M increase.
  • William Blair & Company's biggest Q4 2023 reduction was Danaher, cutting an estimated $37.6M.
  • William Blair & Company fully exited Seagen Inc. Common Stock in Q4 2023, selling an estimated $13.8M.
  • William Blair & Company's ten largest holdings make up 24% of its $29.3B portfolio in Q4 2023.
  • William Blair & Company opened 83 new positions and closed 87 in Q4 2023.
  • William Blair & Company's portfolio value rose 13% quarter-over-quarter to $29.3B.

Based on William Blair & Company's 13F filing for Q4 2023, filed 12 Feb 2024.