3M Co.

Julie Bushman officer

Exercised options: 30,330 Price:

$84.40-$89.36

Shares sold: 30,330 Price: $104.21-$104.26

Date: Feb. 19Directly holds: 16,668

Nicholas Gangestad officer

Exercised options: 7,005 Price: $84.40

Date: Feb. 19Holdings: NA

Ian Hardgrove officer

Shares sold: 2,775 Price: $103.36-$103.40

Date: Feb. 22Directly holds: 9,538

Christopher Holmes officer

Shares sold: 1,400 Price: $104.22

Date: Feb. 20Directly holds: 1,146

Michael Kelly officer

Exercised options: 5,552 Price: $97.21

Shares sold: 10,056 Price: $104.14-$104.18

Date: Feb. 20Directly holds: 19,314

Roger H. Lacey officer

Exercised options: 19,246 Price:

$80.65-$90.35

Shares sold: 24,095 Price: $103.07-$103.15

Date: Feb. 22Directly holds: 21,748

Frederick Palensky chief tech. officer

Exercised options: 66,881 Price:

$54.11-$80.50

Shares sold: 75,439 Price: $104-$104.08

Date: Feb. 19Directly holds: 34,072

Bradley Sauer officer

Exercised options: 59,061 Price:

$84.40-$96.83

Shares sold: 42,592 Price: $104.15-$104.30

Date: Feb. 19Directly holds: 21,023

Hak Cheol Shin officer

Exercised options: 38,721 Price:

$84.40-$87.65

Shares sold: 22,310 Price: $104.15-$104.20

Date: Feb. 20Directly holds: 46,961

Michael Vale officer

Exercised options: 2,112 Price: $61.85

Shares sold: 6,774 Price: $102.55-$102.58

Date: Feb. 21Directly holds: 633

Aetrium Inc.

Archer Advisors major shareholder

Shares purchased: 7,200 Price: $0.65-$0.66

Date: Feb. 20-21Indirectly holds: 454,265

Allete Inc.

Robert John Adams officer

Exercised options: 6,381 Price:

Date: Feb. 21$37.76-$41.35

Shares sold: 7,381 Price: $46.32-$46.94

Date: Feb. 21-22Directly holds: 14,313

Steven Devinck officer

Exercised options: 3,170 Price:

$37.76-$39.10

Shares sold: 3,170 Price: $46.63-$46.70

Date: Feb. 21Directly holds: 12,325

Alan Hodnik CEO

Exercised options: 11,829 Price:

Date: Feb. 21$37.76-$44.15

Holdings: NA

Allete Inc. (CONt.)

Donald Stellmaker officer, treasurer

Exercised options: 7,712 Price:

$37.76-$41.35

Shares sold: 7,712 Price: $46.32

Date: Feb. 21Directly holds: 14,166

Ameriprise Financial Inc.

James Cracchiolo CEO

Exercised options: 228,531 Price: $21.34

Date: Feb. 15-20

Shares sold: 75,126 Price: $69.02

Date: Feb. 19Directly holds: 330,498

Buffalo Wild Wings Inc.

Kathleen Benning-Alberga officer

Shares sold: 2,828 Price: $78.95

Date: Feb. 19Directly holds: 12,319

Sally Smith CEO

Exercised options: 6,189 Price:

Date: Feb. 21$9.08-$24.96

Holdings: NA

Clearfield Inc.

Donald Hayward director

Shares sold: 4,500 Price: $5.40

Date: Feb. 19Directly holds: 9,200

Datalink Corp.

James Leslie officer

Shares sold: 50,000 Price: $10.07-$10.23

Date: Feb. 20-21Directly holds: 34,950

Michael Shawn O'Grady officer

Shares sold: 5,000 Price: $10.10-$10.12

Date: Feb. 22Directly holds: 123,000

Deluxe Corp.

Peter Godich officer

Exercised options: 20,613 Price:

Date: Feb. 19$18.28-$32.65

Holdings: NA

Julie Loosbrock officer

Exercised options: 9,555 Price:

Date: Feb. 19$17.35- $32.65

Holdings: NA

Electro-Sensors Inc.

Nicholas Swenson major shareholder

Shares purchased: 5,895 Price: $3.85-$3.93

Date: Feb. 21-22Indirectly holds: 481,449

Entegris Inc.

Gregory Graves CFO

Exercised options: 25,819 Price: $5.40

Shares sold: 25,819 Price: $9.74

Date: Feb. 19Directly holds: 110,861

Fair Isaac Corp.

Richard Deal officer

Exercised options: 9,180 Price:

$14.16-$35.50

Shares sold: 9,180 Price: $44.82

Date: Feb. 20Directly holds: 34,462

Fastenal Co.

Darren Jackson director

Shares purchased: 10,000 Price: $52.87

Date: Feb. 19Directly holds: 10,000

Nicholas Lundquist officer

Exercised options: 8,000 Price: $22.50

Date: Feb. 20Holdings: NA

Hmn Financial Inc.

Bradley Krehbiel president

Shares sold: 2,000 Price: $5.35-$5.37

Date: Feb. 20-22Directly holds: 94,728

Northern Technologies International CORP.

Pierre Chenu director

Shares sold: 1,000 Price: $13.29

Date: Feb. 25Directly holds: 6,000

Pentair LTD.

William Thomas Monahan director

Exercised options: 10,000 Price: $26.45

Shares sold: 10,000 Price: $52.80

Date: Feb. 19Directly holds: 34,857

Piper Jaffray Companies

Brien O'Brien officer

Shares sold: 12,000 Price: $41.12

Date: Feb. 20Directly holds: 146,734

Two Harbors Invest. Corp

Brad Farrell CFO

Shares purchased: 400 Price: $12.45

Date: Feb. 22Directly holds: 13,250

William Roth chief investment officer

Shares purchased: 3,000 Price: $12.38

Date: Feb. 21Directly holds: 81,300

Thomas Siering CEO

Shares purchased: 25,000 Price:

Date: Feb. 19$12.57-$12.60

Directly holds: 312,573

Vascular Solutions Inc.

Jonathan Hammond officer

Shares sold: 2,330 Price: $15.56

Date: Feb. 21Directly holds: 29,493

Richard Nigon director

Shares sold: 4,000 Price: $15.36

Date: Feb. 19Directly holds: 48,000