Allete Inc.

Robert John Adams officer

Shares sold: 460 Price: $55.50

Date: Feb. 23 Directly holds: 8,466

Ameriprise Financial

Donald Froude officer

Shares sold: 6,000 Price: $136.18

Date: Feb. 20 Directly holds: 28,581

Deirdre Mcgraw-Davey officer

Shares sold: 4,000 Price: $135.83

Date: Feb. 19 Directly holds: 14,204

Bio-Techne Corp.

Howard O'Connell director

Exercised options: 5,000 Price: $56.17

Shares sold: 5,000 Price: $95.78

Date: Feb. 19 Indirectly holds: 72,000

C.H. Robinson Worldwide Inc.

Scott Satterlee officer

Shares sold: 5,916 Price: $71.92

Date: Feb. 19 Indirectly holds: 3,466

Clearfield Inc.

Daniel Herzog CFO

Exercised options: 20,000 Price:

–$3.30

Holdings: na

Cyberoptics Corp.

Subodh Kulkarni CEO

Shares purchased: 500 Price: $9.70

Date: Feb. 23 Directly holds: 30,750

Fair Isaac Corp.

Andrew Jennings officer

Exercised options: 33,127 Price:

–$41.89

Shares sold: 33,127 Price: $81.80

Date: Feb. 19 Indirectly holds: 23,717

H.b. Fuller Co.

James Owens CEO

Shares sold: 1,800 Price: $44.22

Date: Feb. 17 Directly holds: 159,506

Insignia Systems Inc.

AIr T Inc. major shareholder

Shares purchased: 1,100 Price: $3.10

Date: Feb. 24 Directly holds: 1,325,680

Medtronic Plc

Christopher J. O'Connell officer

Exercised options: 48,514 Price:

–$48.70

Shares sold: 50,361 Price:

–19 $78.17–$78.28

Directly holds: 95,928

Pentair Plc

Karl Frykman officer

Exercised options: 7,316 Price: $41.12

Date: Feb. 20 Holdings: na

Piper Jaffray CoS.

Andrew Duff CEO

Shares sold: 2,858 Price: $52.96

Date: Feb. 24 Indirectly holds: 344,494

Martin Winges chief invest. officer

Shares sold: 85 Price: $52.95

Date: Feb. 17 Indirectly holds: 35,223

Polaris Industries Inc.

Michael Jonikas officer

Shares sold: 2,899 Price: $155.07

Date: Feb. 18 Directly holds: 5,870

Proto Labs Inc

Jacqueline Schneider officer

Shares sold: 151 Price: $73.65

Date: Feb. 18 Directly holds: 6,729

Tcf Financial Corp.

Thomas Cusick director

Shares sold: 50,000 Price: $15.69

Date: Feb. 24 Indirectly holds: 195,754

Unitedhealth Group

Eric Stuart Rangen officer

Exercised options: 6,108 Price:

–$70.24

Shares sold: 16,252 Price: $111.03

Date: Feb. 20 Directly holds: 12,620

David Wichmann president

Exercised options: 165,000 Price:

–$59

Date: Feb. 17 Holdings: na

Vascular Solutions

John Erb director

Exercised options: 10,000 Price: $6.39

Shares sold: 10,000 Price: $28.56

Date: Feb. 18 Directly holds: 18,154