Current Market Value 37,679,982,960
Current Holdings 417
Most Recent File Date 2025-07-29
Total Filings on Record 41
SEC Form 13F Filing History

This page shows a list of all the recent 13F filings made by William Blair Investment Management, Llc . Form 13F is required to be filed within 45 days of the end of a calendar quarter. The Form 13F report requires disclosure of the manager that files the report, the name and class of the security, the CUSIP number, the number of shares as of the end of the calendar quarter for which the report is filed, and the total market value. The market value column should not be used as a substitute for Assets Under Management (AUM), as it does not include cash held in accounts.

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File Date Reporting Period Form Amendment Holdings Reported Value
($1000)
2025-07-29 2025-06-30 13F-HR 417 37,679,983
2025-05-09 2025-03-31 13F-HR 423 35,621,637
2025-02-10 2024-12-31 13F-HR 433 40,939,662
2024-11-08 2024-09-30 13F-HR 412 40,534,351
2024-08-08 2024-06-30 13F-HR 411 38,120,368
2024-05-08 2024-03-31 13F-HR 410 38,687,455
2024-02-09 2023-12-31 13F-HR 406 34,363,339
2023-11-09 2023-09-30 13F-HR 398 30,093,063
2023-08-11 2023-06-30 13F-HR 395 31,184,946
2023-05-12 2023-03-31 13F-HR 393 28,699,364
2023-02-09 2022-12-31 13F-HR 401 26,141,511
2022-11-09 2022-09-30 13F-HR 387 25,300,876
2022-08-10 2022-06-30 13F-HR 403 26,983,859
2022-05-11 2022-03-31 13F-HR 441 33,470,556
2022-02-14 2021-12-31 13F-HR 427 37,009,993
2021-11-10 2021-09-30 13F-HR 431 35,457,365
2021-08-12 2021-06-30 13F-HR 465 31,867,471
2021-05-13 2021-03-31 13F-HR 367 30,878,987
2021-02-09 2020-12-31 13F-HR 356 30,036,160
2020-11-06 2020-09-30 13F-HR 343 25,666,025
2020-08-12 2020-06-30 13F-HR 341 24,566,283
2020-05-08 2020-03-31 13F-HR 339 20,547,647
2020-02-12 2019-12-31 13F-HR 356 25,094,282
2019-11-12 2019-09-30 13F-HR 357 23,381,411
2019-08-09 2019-06-30 13F-HR 372 23,833,388
2019-05-10 2019-03-31 13F-HR 406 23,762,098
2019-02-13 2018-12-31 13F-HR 404 20,131,951
2018-11-13 2018-09-30 13F-HR 419 28,886,194
2018-08-14 2018-06-30 13F-HR 476 26,874,947
2018-05-14 2018-03-31 13F-HR 432 26,187,773
2018-02-16 2017-12-31 13F-HR/A 1 R 427 25,729,468
2018-02-14 2017-12-31 13F-HR 426 25,531,528
2017-11-13 2017-09-30 13F-HR 433 27,923,928
2017-08-04 2017-06-30 13F-HR 447 27,489,580
2017-05-10 2017-03-31 13F-HR 432 26,476,249
2017-02-14 2016-12-31 13F-HR 434 25,044,531
2016-11-14 2016-09-30 13F-HR 442 26,422,916
2016-08-05 2016-06-30 13F-HR 451 25,296,242
2016-05-16 2016-03-31 13F-HR 450 25,227,039
2016-02-16 2015-12-31 13F-HR 444 24,686,427
2015-11-12 2015-09-30 13F-HR 1068 48,988,219