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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
XLV icon
276
State Street Health Care Select Sector SPDR ETF
XLV
$43.1B
$18M 0.05%
113,200
-39,763
-26% -$5.92M
PTRN
277
Pattern Group Inc
PTRN
$3.56B
$17.7M 0.05%
+703,580
New +$11.9M
CIBR icon
278
First Trust NASDAQ Cybersecurity ETF
CIBR
$16.1B
$17.5M 0.05%
194,996
+116,333
+148% +$8.93M
IVW icon
279
iShares S&P 500 Growth ETF
IVW
$75.9B
$17.5M 0.05%
127,299
-17,884
-12% -$2.36M
WDAY icon
280
Workday
WDAY
$46.5B
$17.5M 0.05%
142,904
-111,494
-44% -$14.1M
EEM icon
281
iShares MSCI Emerging Markets ETF
EEM
$30.7B
$17.4M 0.05%
253,766
+25,999
+11% +$1.7M
AGG icon
282
iShares Core US Aggregate Bond ETF
AGG
$137B
$17.3M 0.05%
174,976
+11,421
+7% +$1.13M
PAUG icon
283
Innovator US Equity Power Buffer ETF August
PAUG
$1.03B
$17.2M 0.04%
377,754
-26,709
-7% -$1.2M
POCT icon
284
Innovator US Equity Power Buffer ETF October
POCT
$945M
$17M 0.04%
366,562
-4,900
-1% -$223K
CB icon
285
Chubb
CB
$131B
$17M 0.04%
49,915
+1,331
+3% +$434K
SMH icon
286
VanEck Semiconductor ETF
SMH
$67.6B
$16.8M 0.04%
25,583
+2,659
+12% +$1.45M
CWST icon
287
Casella Waste Systems
CWST
$5.74B
$16.7M 0.04%
171,981
-118,483
-41% -$10.1M
SPYM
288
State Street SPDR Portfolio S&P 500 ETF
SPYM
$161B
$16.6M 0.04%
188,833
+6,591
+4% +$562K
EFV icon
289
iShares MSCI EAFE Value ETF
EFV
$31.6B
$16.6M 0.04%
216,505
+2,876
+1% +$223K
VBR icon
290
Vanguard Morningstar Small-Cap Value ETF
VBR
$36.6B
$16.4M 0.04%
67,544
+8,338
+14% +$1.94M
VOT icon
291
Vanguard Morningstar Mid-Cap Growth ETF
VOT
$18.9B
$16.4M 0.04%
53,527
+1,948
+4% +$562K
AJG icon
292
Arthur J. Gallagher & Co
AJG
$64.3B
$16.4M 0.04%
71,325
-3,623
-5% -$769K
IWO icon
293
iShares Russell 2000 Growth ETF
IWO
$14.2B
$16.3M 0.04%
41,456
+2,113
+5% +$771K
LRCX icon
294
Lam Research
LRCX
$340B
$16.3M 0.04%
37,565
-520
-1% -$158K
VKTX icon
295
Viking Therapeutics
VKTX
$3.53B
$16.3M 0.04%
416,766
+45,647
+12% +$1.47M
QQQM icon
296
Invesco NASDAQ 100 ETF
QQQM
$104B
$16.2M 0.04%
53,437
+21,319
+66% +$6.04M
ADBE icon
297
Adobe
ADBE
$104B
$15.8M 0.04%
77,307
-51,566
-40% -$12.2M
NSC icon
298
Norfolk Southern
NSC
$71.7B
$15.7M 0.04%
49,970
+7,465
+18% +$2.3M
VCSH icon
299
Vanguard Short-Term Corporate Bond ETF
VCSH
$44.4B
$15.7M 0.04%
198,546
+20,554
+12% +$1.62M
SNDK
300
Sandisk
SNDK
$228B
$15.6M 0.04%
6,883
+184
+3% +$263K
10 11
12
13 14

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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.