0001019056-21-000301.txt : 20210514 0001019056-21-000301.hdr.sgml : 20210514 20210514172244 ACCESSION NUMBER: 0001019056-21-000301 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20210331 FILED AS OF DATE: 20210514 DATE AS OF CHANGE: 20210514 EFFECTIVENESS DATE: 20210514 FILER: COMPANY DATA: COMPANY CONFORMED NAME: GAGNON SECURITIES LLC CENTRAL INDEX KEY: 0001125725 IRS NUMBER: 134087058 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-06377 FILM NUMBER: 21926131 BUSINESS ADDRESS: STREET 1: 1370 AVENUE OF THE AMERICAS STREET 2: 24TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10019 BUSINESS PHONE: 2125545000 MAIL ADDRESS: STREET 1: 1370 AVENUE OF THE AMERICAS STREET 2: 24TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10019 13F-HR 1 primary_doc.xml 13F-HR LIVE false true false 0001125725 XXXXXXXX 03-31-2021 03-31-2021 false GAGNON SECURITIES LLC

1370 Avenue of the Americas 24th Floor New York NY 10019

13F HOLDINGS REPORT 028-06377 N Lisa Ferrante 212-554-5000 /s/ Lisa Ferrante New York NY 05-14-2021 0 108 656701 INFORMATION TABLE 2 infotable.xml AIR LEASE CORP CL A 00912X302 43537 888505 SH SOLE 0 0 888505 AIR LEASE CORP PFD 00912X500 2898 110603 SH SOLE 0 0 110603 AKAMAI TECHNOLOGIES COM 00971T101 3244 31834 SH SOLE 0 0 31834 ALPHA AND OMEGA SEMICONDUCTORLTD SHS G6331P104 24731 756307 SH SOLE 0 0 756307 ALPHABET INC CAP STK CL A 02079K305 311 151 SH SOLE 0 0 151 AMERESCO INC CL A 02361E108 26381 542476 SH SOLE 0 0 542476 APOLLO ENDOSURGERY INC COM 03767D108 8633 1566794 SH SOLE 0 0 1566794 APTOSE BIOSCIENCES INC COM New 03835T200 655 109611 SH SOLE 0 0 109611 AT&T INC COM 00206R102 2335 77139 SH SOLE 0 0 77139 BIOLIFE SOLUTIONS INC COM NEW 09062W204 14252 395880 SH SOLE 0 0 395880 BLACKLINE INC COM 09239B109 19646 181236 SH SOLE 0 0 181236 BLUE PRISM GROUP PLC COM NEW G1193C101 490 27963 SH SOLE 0 0 27963 BUTTERFLY NETWORK INC COM CL A 124155102 701 41630 SH SOLE 0 0 41630 CAREDX INC COM 14167L103 55784 819265 SH SOLE 0 0 819265 CARETRUST REIT INC COM 14174T107 5064 217493 SH SOLE 0 0 217493 CARMAX INC COM 143130102 16344 123200 SH SOLE 0 0 123200 CASTLIGHT HEALTH INC CL B 14862Q100 6239 4132008 SH SOLE 0 0 4132008 CELCUITY INC COM 15102K100 5941 414292 SH SOLE 0 0 414292 CES ENERGY SOLUTIONS CORP COM 15713J104 146 114152 SH SOLE 0 0 114152 CHEESECAKE FACTORY INC COM 163072101 1638 27994 SH SOLE 0 0 27994 CHEGG INC COM 163092109 462 5394 SH SOLE 0 0 5394 CHEMBIO DIAGNOSTICS INC COM New 163572209 169 48072 SH SOLE 0 0 48072 CHIPOTLE MEXICAN GRILL INC COM 169656105 6804 4789 SH SOLE 0 0 4789 CM LIFE SCIENCES II INC Unit 02/25/2028 125842203 9759 762450 SH SOLE 0 0 762450 CM LIFE SCIENCES INC Unit 09/01/2025 18978W208 10797 656336 SH SOLE 0 0 656336 CNFINANCE HOLDINGS LIMITED SPON ADS 18979T105 5380 1393884 SH SOLE 0 0 1393884 CORE LABORATORIES NV COM N22717107 293 10166 SH SOLE 0 0 10166 DENISON MINES CORPORATION COM 248356107 354 324831 SH SOLE 0 0 324831 DERMTECH INC COM 24984K105 309 6077 SH SOLE 0 0 6077 DEVON ENERGY COM 25179M103 5643 258247 SH SOLE 0 0 258247 DURECT CORP COM 266605104 2661 1343805 SH SOLE 0 0 1343805 DYNAGAS LNG PARTNERS LP COM UNIT LTD PT Y2188B108 146 51032 SH SOLE 0 0 51032 E2OPEN PARENT HOLDINGS INC COM CL A 29788T103 8751 878576 SH SOLE 0 0 878576 EHEALTH INC COM 28238P109 602 8279 SH SOLE 0 0 8279 ENERGY TRANSFER L P COM UT LTD PTN 29273V100 364 47448 SH SOLE 0 0 47448 ENSIGN GROUP INC COM 29358P101 37888 403756 SH SOLE 0 0 403756 ENTERPRISE PRODS PARTNERSL P COM 293792107 13820 627628 SH SOLE 0 0 627628 EOG RESOURCES INC COM 26875P101 592 8160 SH SOLE 0 0 8160 EQUINIX INC COM 29444U700 11455 16856 SH SOLE 0 0 16856 ETSY INC COM 29786A106 428 2121 SH SOLE 0 0 2121 EVERBRIDGE INC COM 29978A104 15657 129208 SH SOLE 0 0 129208 EXCHANGE TRADED CONCEPTSTR NORTH SHOR GBL 301505715 421 7595 SH SOLE 0 0 7595 EXXON MOBIL CORP COM 30231G102 1746 31270 SH SOLE 0 0 31270 FACEBOOK INC CL A 30303M102 311 1057 SH SOLE 0 0 1057 Five9 INC. 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