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William Blair Investment Management, LLC

Activist investor & 5%+ owner · SC 13D/13G filings

Total Filings

78

Stocks Covered

46

Latest Filing

Nov 14, 2024

Filings

Orion S.A.

SC 13G · Nov 14, 2024

5.1%

3.0M shares

Doximity, Inc.

SC 13G · Nov 14, 2024

5.2%

6.5M shares

Amicus Therapeutics, Inc.

SC 13G · Nov 14, 2024

5.3%

15.6M shares

BBB Foods Inc.

SC 13G · Nov 14, 2024

5.0%

1.9M shares

New Fortress Energy Inc.

SC 13G · Nov 14, 2024

5.4%

11.1M shares

ACV Auctions Inc.

SC 13G · Nov 14, 2024

5.6%

8.4M shares

ZipRecruiter, Inc.

SC 13G · Nov 14, 2024

5.9%

4.5M shares

Golden Entertainment, Inc.

SC 13G · Nov 14, 2024

5.8%

1.6M shares

Fox Factory Holding Corp.

SC 13G · Nov 14, 2024

6.1%

2.5M shares

Neogen Corporation

SC 13G · Nov 14, 2024

6.1%

13.3M shares

Flywire Corporation

SC 13G · Nov 14, 2024

9.4%

11.6M shares

Freshpet Inc

SC 13G/A · Nov 14, 2024

3.0%

1.5M shares

Alarm.com Holdings Inc

SC 13G/A · Nov 14, 2024

1.1%

564K shares

Vital Farms Inc

SC 13G/A · Nov 14, 2024

2.0%

866K shares

Lancaster Colony Corp

SC 13G/A · Nov 14, 2024

3.5%

972K shares

Merit Medical Systems Inc

SC 13G/A · Nov 14, 2024

2.5%

1.4M shares

ADTRAN Holdings Inc

SC 13G/A · Nov 14, 2024

6.2%

4.9M shares

Virtu Financial, Inc.

SC 13G/A · Nov 14, 2024

2.9%

2.5M shares

Casella Waste Systems Inc

SC 13G/A · Nov 14, 2024

4.3%

2.7M shares

BWX Technologies, Inc.

SC 13G/A · Nov 14, 2024

3.5%

3.2M shares

Mercury Systems Inc

SC 13G/A · Nov 14, 2024

12.3%

7.3M shares

Encompass Health Corp

SC 13G/A · Nov 14, 2024

3.3%

3.3M shares

National Vision Holdings Inc

SC 13G/A · Sep 9, 2024

0.8%

593K shares

National Vision Holdings Inc

SC 13G/A · Feb 12, 2024

12.6%

9.8M shares

The Brink’s Company

SC 13G/A · Feb 12, 2024

7.0%

3.2M shares

Leslie’s, Inc.

SC 13G/A · Feb 12, 2024

0.0%

0 shares

Standard Motor Products Inc

SC 13G/A · Feb 12, 2024

4.8%

1.0M shares

Euronet Worldwide Inc

SC 13G/A · Feb 12, 2024

2.0%

929K shares

AudioCodes Ltd

SC 13G/A · Feb 12, 2024

4.9%

1.5M shares

Luxfer Holdings PLC

SC 13G/A · Feb 12, 2024

0.0%

0 shares

PagerDuty, Inc.

SC 13G/A · Feb 12, 2024

0.0%

0 shares

ADTRAN Holdings Inc

SC 13G · Feb 12, 2024

5.1%

4.0M shares

Casella Waste Systems Inc

SC 13G · Feb 12, 2024

5.1%

2.9M shares

Varonis Systems Inc

SC 13G/A · Feb 12, 2024

3.0%

3.2M shares

Orion SA

SC 13G/A · Feb 12, 2024

4.2%

2.5M shares

Alarm.com Holdings Inc

SC 13G · Feb 12, 2024

5.0%

2.5M shares

Encompass Health Corp

SC 13G · Feb 12, 2024

5.2%

5.2M shares

Lancaster Colony Corp

SC 13G · Feb 12, 2024

5.0%

1.4M shares

Freshpet Inc

SC 13G · Feb 12, 2024

5.5%

2.6M shares

Clearwater Analytics Holdings Inc

SC 13G · Feb 12, 2024

5.7%

7.3M shares

Vital Farms Inc

SC 13G · Feb 12, 2024

5.8%

2.4M shares

Twist Bioscience Corp

SC 13G · Feb 12, 2024

6.2%

3.5M shares

Merit Medical Systems Inc

SC 13G/A · Feb 12, 2024

6.6%

3.8M shares

BWX Technologies, Inc.

SC 13G/A · Feb 12, 2024

5.1%

4.6M shares

Virtu Financial, Inc.

SC 13G/A · Feb 12, 2024

9.2%

8.3M shares

Mercury Systems Inc

SC 13G/A · Feb 12, 2024

11.1%

6.6M shares

Revolve Group, Inc.

SC 13G/A · Feb 12, 2024

13.4%

5.3M shares

Mercury Systems Inc

SC 13G/A · Sep 6, 2023

11.6%

6.7M shares

National Vision Holdings Inc

SC 13G/A · Apr 5, 2023

11.0%

8.7M shares

Virtu Financial, Inc.

SC 13G/A · Feb 9, 2023

8.2%

8.2M shares