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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
+19.08%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
AUM
$38.4B
AUM Growth
+$3.49B
Cap. Flow
-$792M
Cap. Flow %
-2.06%
Top 10 Hldgs %
26.32%
Holding
2,083
New
163
Increased
891
Reduced
708
Closed
85

Top Buys

Rank Stock Value
1
HONA
Honeywell Aerospace
HONA
+$100M
2
ANET icon
Arista Networks
ANET
+$71.2M
3
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$61.8M
4
VTI icon
Vanguard Morningstar Total Stock Market ETF
VTI
+$55.8M
5
MIAX
Miami International Holdings
MIAX
+$49.4M

Top Sells

Rank Stock Value
1
XOM icon
ExxonMobil
XOM
+$161M
2
CPRT icon
Copart
CPRT
+$62M
3
DHR icon
Danaher
DHR
+$59.1M
4
AAPL icon
Apple
AAPL
+$57M
5
VEEV icon
Veeva Systems
VEEV
+$52.2M

Sector Composition

Rank Sector Weight
1 Technology 24.38%
2 Miscellaneous 18.67%
3 Industrials 15.24%
4 Financials 11.07%
5 Healthcare 9.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PLMR icon
301
Palomar
PLMR
$3.59B
$15.6M 0.04%
123,271
+21,843
+22% +$2.57M
SN icon
302
SharkNinja
SN
$23.5B
$15.5M 0.04%
101,631
+15,885
+19% +$1.9M
XBI icon
303
State Street SPDR S&P Biotech ETF
XBI
$10.4B
$15.2M 0.04%
95,781
+14,629
+18% +$1.98M
TDUP icon
304
ThredUp
TDUP
$338M
$15M 0.04%
2,195,729
+113,175
+5% +$529K
CMG icon
305
Chipotle Mexican Grill
CMG
$43.9B
$15M 0.04%
442,227
-37,299
-8% -$1.22M
VGT icon
306
Vanguard Information Technology ETF
VGT
$146B
$15M 0.04%
125,123
-126,845
-50% -$13.9M
PAPR icon
307
Innovator US Equity Power Buffer ETF April
PAPR
$960M
$14.8M 0.04%
351,283
+98,944
+39% +$4.12M
VGK icon
308
Vanguard FTSE Europe ETF
VGK
$30.2B
$14.5M 0.04%
163,414
+11,775
+8% +$1.03M
CBOE icon
309
Cboe Global Markets
CBOE
$28.6B
$14.5M 0.04%
59,577
+79
+0.1% +$24.2K
EOG icon
310
EOG Resources
EOG
$80.8B
$14.2M 0.04%
109,671
+9,454
+9% +$1.29M
MAR icon
311
Marriott International
MAR
$88B
$14.2M 0.04%
38,225
+5,190
+16% +$1.91M
SNEX icon
312
StoneX
SNEX
$8.08B
$14.1M 0.04%
179,094
+7,587
+4% +$569K
WDC icon
313
Western Digital
WDC
$149B
$14.1M 0.04%
22,023
-468
-2% -$228K
XLE icon
314
State Street Energy Select Sector SPDR ETF
XLE
$43.3B
$14M 0.04%
264,098
+40,653
+18% +$2.32M
MKL icon
315
Markel Group
MKL
$22.1B
$14M 0.04%
7,173
-139
-2% -$260K
TROW icon
316
T. Rowe Price
TROW
$22.4B
$13.9M 0.04%
122,440
-60,077
-33% -$6.14M
PLTR icon
317
Palantir
PLTR
$418B
$13.9M 0.04%
119,250
-106,444
-47% -$14.5M
PNC icon
318
PNC Financial Services
PNC
$96B
$13.8M 0.04%
55,938
+1,448
+3% +$324K
KMB icon
319
Kimberly-Clark
KMB
$32.6B
$13.8M 0.04%
125,313
-21,843
-15% -$2.16M
FISV
320
Fiserv Inc
FISV
$27.2B
$13.7M 0.04%
279,711
-127,424
-31% -$7.12M
SOLS
321
Solstice Advanced Materials
SOLS
$9.08B
$13.6M 0.04%
153,677
+108,954
+244% +$8.99M
SDY icon
322
State Street SPDR S&P Dividend ETF
SDY
$21.4B
$13.3M 0.03%
87,329
+4,573
+6% +$681K
EXEL icon
323
Exelixis
EXEL
$14B
$13.2M 0.03%
243,215
+49,977
+26% +$2.43M
VBK icon
324
Vanguard Morningstar Small-Cap Growth ETF
VBK
$22.8B
$13.2M 0.03%
35,984
+3,057
+9% +$1.04M
UPS icon
325
United Parcel Service
UPS
$87.4B
$13.2M 0.03%
122,398
-545
-0.4% -$56.7K
11 12
13
14 15

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William Blair & Company's Q2 2026 Portfolio in Review

As of Q2 2026, William Blair & Company held 2,083 positions worth $38.4B, up 10% from $34.9B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q2 2026 filing shows 163 new, 891 increased, 708 reduced and 85 closed positions. Its largest new stake was Honeywell Aerospace: 454,071 shares worth $100M. The largest sale was ExxonMobil, an estimated $161M.

By sector, the portfolio is most concentrated in Technology at 24% of assets, up from 22% a quarter earlier, followed by Miscellaneous and Industrials.

  • William Blair & Company's largest Q2 2026 buy was Honeywell Aerospace: 454,071 shares worth $100M.
  • William Blair & Company added most to Arista Networks in Q2 2026, an estimated $71.2M increase.
  • William Blair & Company's biggest Q2 2026 reduction was Copart, cutting an estimated $62M.
  • William Blair & Company fully exited ExxonMobil in Q2 2026, selling an estimated $161M.
  • William Blair & Company's ten largest holdings make up 26% of its $38.4B portfolio in Q2 2026.
  • William Blair & Company opened 163 new positions and closed 85 in Q2 2026.
  • William Blair & Company's portfolio value rose 10% quarter-over-quarter to $38.4B.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.