William Blair & Company
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William Blair & Company’s iShares National Muni Bond ETF MUB Stock Holding History

William Blair & Company’s Portfolio MUB Stock Details MUB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.92M Sell
36,931
-742
-2% -$79.8K 0.01% 559
2025
Q4 		$4.04M Sell
37,673
-943
-2% -$101K 0.01% 575
2025
Q3 		$4.11M Buy
38,616
+432
+1% +$45.2K 0.01% 569
2025
Q2 		$3.99M Buy
38,184
+3,958
+12% +$412K 0.01% 557
2025
Q1 		$3.61M Buy
34,226
+2,395
+8% +$255K 0.01% 568
2024
Q4 		$3.39M Sell
31,831
-729
-2% -$78.3K 0.01% 590
2024
Q3 		$3.54M Buy
32,560
+5,627
+21% +$606K 0.01% 580
2024
Q2 		$2.87M Sell
26,933
-8,097
-23% -$862K 0.01% 604
2024
Q1 		$3.77M Buy
35,030
+8,414
+32% +$908K 0.01% 536
2023
Q4 		$2.89M Buy
26,616
+5,920
+29% +$619K 0.01% 584
2023
Q3 		$2.12M Sell
20,696
-4,436
-18% -$468K 0.01% 639
2023
Q2 		$2.68M Sell
25,132
-4,891
-16% -$523K 0.01% 599
2023
Q1 		$3.23M Sell
30,023
-2,147
-7% -$229K 0.01% 541
2022
Q4 		$3.39M Buy
32,170
+10,635
+49% +$1.11M 0.01% 515
2022
Q3 		$2.21M Sell
21,535
-55,392
-72% -$5.89M 0.01% 596
2022
Q2 		$8.18M Buy
76,927
+38,337
+99% +$4.09M 0.04% 327
2022
Q1 		$4.23M Buy
38,590
+2,365
+7% +$267K 0.01% 504
2021
Q4 		$4.21M Sell
36,225
-5,297
-13% -$615K 0.01% 516
2021
Q3 		$4.82M Sell
41,522
-2,354
-5% -$276K 0.02% 467
2021
Q2 		$5.14M Sell
43,876
-524
-1% -$61.2K 0.02% 453
2021
Q1 		$5.15M Sell
44,400
-6,661
-13% -$777K 0.02% 448
2020
Q4 		$5.98M Buy
51,061
+2,584
+5% +$300K 0.02% 398
2020
Q3 		$5.62M Sell
48,477
-55,322
-53% -$6.43M 0.02% 374
2020
Q2 		$12M Sell
103,799
-2,628
-2% -$298K 0.06% 247
2020
Q1 		$12M Sell
106,427
-20,701
-16% -$2.36M 0.08% 211
2019
Q4 		$14.5M Buy
127,128
+4,893
+4% +$557K 0.07% 221
2019
Q3 		$13.9M Buy
122,235
+14,203
+13% +$1.62M 0.08% 218
2019
Q2 		$12.2M Buy
108,032
+4,138
+4% +$463K 0.07% 233
2019
Q1 		$11.6M Buy
103,894
+7,141
+7% +$783K 0.07% 237
2018
Q4 		$10.6M Sell
96,753
-19,044
-16% -$2.05M 0.08% 233
2018
Q3 		$12.5M Buy
115,797
+81,138
+234% +$8.82M 0.08% 222
2018
Q2 		$3.78M Sell
34,659
-2,496
-7% -$271K 0.03% 414
2018
Q1 		$4.05M Sell
37,155
-300
-0.8% -$32.7K 0.03% 398
2017
Q4 		$4.15M Buy
37,455
+500
+1% +$55.3K 0.03% 402
2017
Q3 		$4.1M Buy
36,955
+158
+0.4% +$17.5K 0.03% 383
2017
Q2 		$4.05M Sell
36,797
-298
-0.8% -$32.8K 0.03% 393
2017
Q1 		$4.04M Sell
37,095
-5,200
-12% -$564K 0.03% 367
2016
Q4 		$4.58M Buy
42,295
+14,808
+54% +$1.62M 0.04% 323
2016
Q3 		$3.1M Sell
27,487
-1,303
-5% -$148K 0.03% 405
2016
Q2 		$3.28M Buy
28,790
+18,175
+171% +$2.05M 0.03% 366
2016
Q1 		$1.19M Buy
10,615
+1,615
+18% +$180K 0.01% 577
2015
Q4 		$996K Sell
9,000
-200
-2% -$21.9K 0.01% 632
2015
Q3 		$1.01M Sell
9,200
-500
-5% -$54.4K 0.01% 758
2015
Q2 		$1.05M Hold
9,700
– – ﹤0.01% 1570
2015
Q1 		$1.07M Buy
9,700
+200
+2% +$22.1K ﹤0.01% 1534
2014
Q4 		$1.05M Sell
9,500
-200
-2% -$22K ﹤0.01% 1489
2014
Q3 		$1.06M Hold
9,700
– – ﹤0.01% 1448
2014
Q2 		$1.05M Hold
9,700
– – ﹤0.01% 1442
2014
Q1 		$1.04M Hold
9,700
– – ﹤0.01% 1412
2013
Q4 		$1.01M Sell
9,700
-9,200
-49% -$960K ﹤0.01% 1388
2013
Q3 		$1.98M Sell
18,900
-3,700
-16% -$382K ﹤0.01% 1142
2013
Q2 		$2.37M Buy
+22,600
New +$2.47M ﹤0.01% 1031

Other funds holding MUB

Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Betterment LLC
Betterment LLC New York $52.8B AUM 15.34% 1-Year Est. Return
Envestnet Asset Management
Envestnet Asset Management Chicago, Illinois $424B AUM 22.96% 1-Year Est. Return
Creative Planning
Creative Planning Overland Park, Kansas $147B AUM 18.73% 1-Year Est. Return
LPL Financial
LPL Financial San Diego, California $445B AUM 25.58% 1-Year Est. Return
Fisher Asset Management
Fisher Asset Management Camas, Washington $336B AUM 34.66% 1-Year Est. Return
Wells Fargo
Wells Fargo San Francisco, California $530B AUM 22.01% 1-Year Est. Return
Mercer Global Advisors
Mercer Global Advisors Denver, Colorado $67.6B AUM 18.3% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

William Blair & Company's MUB Position: Q1 2026 in Review

William Blair & Company reduced its iShares National Muni Bond ETF (MUB) stake by 2% in Q1 2026, selling an estimated $79.8K and leaving 36,931 shares worth $3.92M. The position accounts for 0.01% of the portfolio, ranked #559.

William Blair & Company first reported a position in MUB in Q2 2013 and has held it in 52 quarters since. The position peaked at $14.5M in Q4 2019. 1,626 funds tracked by Wall St. Rank hold MUB as of Q1 2026.

  • William Blair & Company held 36,931 shares of iShares National Muni Bond ETF worth $3.92M as of Q1 2026.
  • William Blair & Company sold 742 iShares National Muni Bond ETF shares in Q1 2026, an estimated $79.8K.
  • iShares National Muni Bond ETF made up 0.01% of William Blair & Company's portfolio in Q1 2026, its #559 holding.
  • William Blair & Company first reported a position in iShares National Muni Bond ETF in Q2 2013 and has held it in 52 quarters since.
  • William Blair & Company's iShares National Muni Bond ETF position peaked at $14.5M in Q4 2019.
  • 1,626 funds tracked by Wall St. Rank held iShares National Muni Bond ETF as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.