PROTO LABS INC

Ticker: PRLB CUSIP: 743713109 Class: EQTY

Note: Option positions (PUT/CALL) are excluded.

InstitutionSharesValue ($000)
BlackRock, Inc.3,619,004$183,085
DISCIPLINED GROWTH INVESTORS INC /MN2,673,729$135,264
VANGUARD GROUP INC2,666,227$134,884
DIMENSIONAL FUND ADVISORS LP1,276,561$64,583
Rubric Capital Management LP1,123,338$56,830
STATE STREET CORP1,088,206$55,052
AMERICAN CAPITAL MANAGEMENT INC631,311$31,938
GEODE CAPITAL MANAGEMENT, LLC558,300$28,250
RENAISSANCE TECHNOLOGIES LLC493,551$24,969
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP460,618$23,303
DRIEHAUS CAPITAL MANAGEMENT LLC382,155$19,333
CHARLES SCHWAB INVESTMENT MANAGEMENT INC363,013$18,365
Nuveen, LLC325,750$16,480
S Squared Technology, LLC306,103$15,486
MORGAN STANLEY305,612$15,461
NORTHERN TRUST CORP256,268$12,965
NORDEA INVESTMENT MANAGEMENT AB224,439$11,505
D. E. Shaw & Co., Inc.212,868$10,769
JUPITER ASSET MANAGEMENT LTD194,832$9,857
PRUDENTIAL FINANCIAL INC182,826$9,249
PANAGORA ASSET MANAGEMENT INC175,585$8,883
UBS Group AG175,416$8,874
Hillsdale Investment Management Inc.168,284$8,513
GOLDMAN SACHS GROUP INC160,604$8,125
Bank of New York Mellon Corp142,995$7,234
PRINCIPAL FINANCIAL GROUP INC136,670$6,914
Connor, Clark & Lunn Investment Management Ltd.130,767$6,616
FMR LLC122,100$6,177
JPMORGAN CHASE & CO118,635$6,002
RICE HALL JAMES & ASSOCIATES, LLC114,563$5,796
BRIDGEWAY CAPITAL MANAGEMENT, LLC113,876$5,761
GAGNON SECURITIES LLC111,548$5,643
JANE STREET GROUP, LLC110,595$5,595
Public Sector Pension Investment Board110,351$5,583
Invesco Ltd.107,698$5,448
FIRST TRUST ADVISORS LP105,929$5,359
MILLENNIUM MANAGEMENT LLC101,532$5,137
BANK OF AMERICA CORP /DE/93,329$4,722
Polar Asset Management Partners Inc.83,402$4,219
AMERICAN CENTURY COMPANIES INC79,145$4,004
LAZARD ASSET MANAGEMENT LLC75,574$3,823
RHUMBLINE ADVISERS64,715$3,274
UBS ASSET MANAGEMENT AMERICAS INC64,643$3,270
Legal & General Group Plc63,927$3,234
ARK Investment Management LLC56,744$2,871
AQR CAPITAL MANAGEMENT LLC51,260$2,593
AMERIPRISE FINANCIAL INC48,717$2,464
Swiss National Bank47,100$2,383
Campbell & CO Investment Adviser LLC41,520$2,100
CWA Asset Management Group, LLC41,508$2,100
Point72 Asset Management, L.P.39,907$2,019
AIMZ Investment Advisors, LLC39,628$2,005
BARCLAYS PLC38,149$1,930
FRANKLIN RESOURCES INC32,937$1,666
FEDERATED HERMES, INC.30,748$1,556
Voya Investment Management LLC30,218$1,529
SG Americas Securities, LLC30,155$2
WELLS FARGO & COMPANY/MN29,974$1,516
ACADIAN ASSET MANAGEMENT LLC29,468$1
PRICE T ROWE ASSOCIATES INC /MD/28,034$1
DEUTSCHE BANK AG\27,768$1,405
Assenagon Asset Management S.A.27,745$1,404
Trexquant Investment LP27,627$1,398
TEACHER RETIREMENT SYSTEM OF TEXAS24,359$1,232
NEW YORK STATE TEACHERS RETIREMENT SYSTEM23,488$1
VIRGINIA RETIREMENT SYSTEMS ET AL23,400$1,184
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM23,144$1,171
GABELLI FUNDS LLC21,132$1,069
ALLIANCEBERNSTEIN L.P.20,740$1,049
GREAT WEST LIFE ASSURANCE CO /CAN/19,845$1
State of Tennessee, Department of Treasury17,728$933
ALPS ADVISORS INC17,713$896
ROYAL BANK OF CANADA16,627$842
Thrivent Financial for Lutherans16,271$1
DARK FOREST CAPITAL MANAGEMENT LP15,943$807
CAPTRUST FINANCIAL ADVISORS15,849$802
ESSEX INVESTMENT MANAGEMENT CO LLC15,504$784
CITIGROUP INC15,313$775
Qube Research & Technologies Ltd14,950$756
Engineers Gate Manager LP14,733$745
Verition Fund Management LLC14,600$739
Versor Investments LP14,599$739
GABELLI & Co INVESTMENT ADVISERS, INC.14,500$734
STRS OHIO14,000$708
Quantinno Capital Management LP13,935$705
HSBC HOLDINGS PLC13,624$694
MetLife Investment Management, LLC13,537$685
BAILARD, INC.13,281$672
State of Alaska, Department of Revenue13,280$1
STATE OF WISCONSIN INVESTMENT BOARD13,259$671
Toroso Investments, LLC12,997$658
CANADA PENSION PLAN INVESTMENT BOARD12,700$642
Illinois Municipal Retirement Fund12,571$636
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.12,507$633
CITADEL ADVISORS LLC12,461$630
JANUS HENDERSON GROUP PLC12,228$618
Marks Group Wealth Management, Inc12,052$610
Amundi12,051$610
Select Equity Group, L.P.11,919$603
Horizon Investments, LLC11,886$601
132 other institutions401,618$17,301
Total (232 institutions)21,756,145$1,089,712