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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
+25.48%
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
$30B
AUM Growth
+$4.37B
Cap. Flow
-$974M
Cap. Flow %
-3.24%
Top 10 Hldgs %
17.75%
Holding
375
New
32
Increased
99
Reduced
224
Closed
19

Top Buys

Rank Stock Value
1
TECH icon
Bio-Techne
TECH
+$212M
2
TXG icon
10x Genomics
TXG
+$186M
3
TMX
Terminix Global Holdings, Inc.
TMX
+$126M
4
MMSI icon
Merit Medical Systems
MMSI
+$125M
5
ZEN
ZENDESK INC
ZEN
+$121M

Top Sells

Rank Stock Value
1
IRTC icon
iRhythm Holdings
IRTC
+$255M
2
EXAS
Exact Sciences
EXAS
+$246M
3
TRU icon
TransUnion
TRU
+$166M
4
BN icon
Brookfield
BN
+$112M
5
TSM icon
TSMC
TSM
+$104M

Sector Composition

Rank Sector Weight
1 Technology 26.72%
2 Healthcare 19.58%
3 Industrials 13.65%
4 Consumer Discretionary 13.62%
5 Financials 6.72%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
LSI
276
DELISTED
Life Storage, Inc.
LSI
$11.8M 0.04%
148,134
-21,614
-13% -$1.65M
MCHI icon
277
iShares MSCI China ETF
MCHI
$6.21B
$11.7M 0.04%
144,650
-14,850
-9% -$1.18M
PE
278
DELISTED
PARSLEY ENERGY INC
PE
$11.7M 0.04%
820,662
+335,158
+69% +$3.99M
SXT icon
279
Sensient Technologies
SXT
$5.55B
$11.4M 0.04%
154,456
-3,033
-2% -$212K
BPFH
280
DELISTED
Boston Private Financial Holdings, Inc.
BPFH
$11.3M 0.04%
1,342,712
-26,481
-2% -$188K
AGYS icon
281
Agilysys
AGYS
$3.03B
$11.3M 0.04%
294,943
-508,858
-63% -$16.9M
ACH
282
Accendra Health
ACH
$93.1M
$11.3M 0.04%
+417,772
New +$10.7M
SSD icon
283
Simpson Manufacturing
SSD
$7.99B
$11.1M 0.04%
119,114
-29,687
-20% -$2.76M
JJSF icon
284
J&J Snack Foods
JJSF
$1.67B
$11.1M 0.04%
71,631
+8,213
+13% +$1.2M
IPAR icon
285
Interparfums
IPAR
$3.78B
$11.1M 0.04%
+183,717
New +$9.24M
CHDN icon
286
Churchill Downs
CHDN
$6.17B
$11.1M 0.04%
+113,748
New +$10.3M
FNB icon
287
FNB Corp
FNB
$6.86B
$11M 0.04%
1,162,785
-22,867
-2% -$194K
BTRS
288
DELISTED
BTRS Holdings Inc. Class 1 Common Stock
BTRS
$11M 0.04%
+683,358
New +$8.71M
RNST icon
289
Renasant Corp
RNST
$3.96B
$11M 0.04%
325,258
-6,416
-2% -$196K
NBHC icon
290
National Bank Holdings
NBHC
$1.92B
$10.9M 0.04%
333,987
-6,584
-2% -$209K
CADE
291
DELISTED
Cadence Bancorporation
CADE
$10.9M 0.04%
663,432
-13,039
-2% -$173K
SASR
292
DELISTED
Sandy Spring Bancorp Inc
SASR
$10.9M 0.04%
337,572
-6,658
-2% -$190K
PACW
293
DELISTED
PacWest Bancorp
PACW
$10.7M 0.04%
423,014
-8,314
-2% -$185K
AON icon
294
Aon
AON
$74.7B
$10.7M 0.04%
50,723
+3,980
+9% +$813K
HASI icon
295
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$5.37B
$10.7M 0.04%
168,279
-43,730
-21% -$2.24M
AAT
296
American Assets Trust
AAT
$1.39B
$10.6M 0.04%
365,505
-43,461
-11% -$1.16M
CPK icon
297
Chesapeake Utilities
CPK
$3.25B
$10.3M 0.03%
+95,468
New +$9.56M
ZWS icon
298
Zurn Elkay Water Solutions
ZWS
$8.46B
$10.3M 0.03%
+541,305
New +$9.29M
SAIA icon
299
Saia
SAIA
$9.73B
$10.2M 0.03%
56,550
-29,527
-34% -$4.85M
BANR icon
300
Banner Corp
BANR
$2.5B
$10.2M 0.03%
218,845
-4,324
-2% -$178K
10 11
12
13 14

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William Blair Investment Management's Q4 2020 Portfolio in Review

As of Q4 2020, William Blair Investment Management held 375 positions worth $30B, up 17% from $25.7B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

William Blair Investment Management withdrew a net $974M in Q4 2020, closing 19 positions and reducing 224 holdings. Its most notable exit was iRhythm Holdings, an estimated $255M position sold in full.

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

Against the trend, William Blair Investment Management opened a new position in Bio-Techne worth $232M.

  • William Blair Investment Management's largest Q4 2020 buy was Bio-Techne: 2,923,168 shares worth $232M.
  • William Blair Investment Management added most to Terminix Global Holdings, Inc. in Q4 2020, an estimated $126M increase.
  • William Blair Investment Management's biggest Q4 2020 reduction was Exact Sciences, cutting an estimated $246M.
  • William Blair Investment Management fully exited iRhythm Holdings in Q4 2020, selling an estimated $255M.
  • William Blair Investment Management's ten largest holdings make up 18% of its $30B portfolio in Q4 2020.
  • William Blair Investment Management opened 32 new positions and closed 19 in Q4 2020.
  • William Blair Investment Management's portfolio value rose 17% quarter-over-quarter to $30B.

Based on William Blair Investment Management's 13F filing for Q4 2020, filed 9 Feb 2021.