Essex Investment Management Co LLC 13F holdings
Essex Investment Management Co LLC reported 304 positions with a total reported value of $763.4M as of 2026-06-30, in its 13F for Q2 2026, filed 2026-08-06. Top holdings by reported value: TSEM TOWER SEMICONDUCTOR LTD (3.6%), LINCOLN EDL SVCS CORP (2.2%), KNSA KINIKSA PHARMACEUTICALS INTL P (2.0%), OUST OUSTER INC (1.9%), LGND LIGAND PHARMACEUTICALS INC (1.8%). Against 2026-03-31 it opened 26 new positions and exited 26. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
25 largest of 304 positions · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| TSEM TOWER SEMICONDUCTOR LTD | 105,543 | $27.5M | 3.6% |
| LINCOLN EDL SVCS CORP | 340,366 | $17.0M | 2.2% |
| KNSA KINIKSA PHARMACEUTICALS INTL P | 241,382 | $15.4M | 2.0% |
| OUST OUSTER INC | 226,028 | $14.1M | 1.9% |
| LGND LIGAND PHARMACEUTICALS INC | 43,567 | $13.8M | 1.8% |
| CECO CECO ENVIRONMENTAL CORP | 150,416 | $13.6M | 1.8% |
| STRL STERLING INFRASTRUCTURE INC | 16,155 | $13.6M | 1.8% |
| AIP ARTERIS INC | 277,665 | $13.5M | 1.8% |
| MIRM MIRUM PHARMACEUTICALS INC | 105,669 | $12.4M | 1.6% |
| AGX ARGAN INC | 15,467 | $12.4M | 1.6% |
| GHC GRAHAM CORP | 93,405 | $11.6M | 1.5% |
| DRS LEONARDO DRS INC | 250,215 | $10.7M | 1.4% |
| ADPT ADAPTIVE BIOTECHNOLOGIES CORP | 472,763 | $10.1M | 1.3% |
| WERN WERNER ENTERPRISES INC | 231,625 | $10.1M | 1.3% |
| HCI HCI GROUP INC | 56,260 | $9.9M | 1.3% |
| GEV GE VERNOVA INC | 8,283 | $9.7M | 1.3% |
| COHU COHU INC | 131,170 | $9.7M | 1.3% |
| AAPL APPLE INC | 32,427 | $9.4M | 1.2% |
| AMSC AMERICAN SUPERCONDUCTOR CORP | 221,933 | $9.2M | 1.2% |
| BWAY BRAINSWAY LTD | 592,606 | $9.2M | 1.2% |
| TTI TETRA TECHNOLOGIES INC DEL | 741,007 | $8.4M | 1.1% |
| LSI INDS INC OHIO | 295,820 | $7.9M | 1.0% |
| MRVL MARVELL TECHNOLOGY INC | 25,911 | $7.7M | 1.0% |
| KRATOS DEFENSE & SEC SOLUTIONS | 153,576 | $7.7M | 1.0% |
| TVTX TRAVERE THERAPEUTICS INC | 133,866 | $7.6M | 1.0% |
SEC FORM 13F · Q2 2026 · VALUES AS REPORTED, NOT PRICES
New positions this quarter
Held at 2026-06-30, not at 2026-03-31 · 26 in all · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| WERN WERNER ENTERPRISES INC | 231,625 | $10.1M | 1.3% |
| XMTR XOMETRY INC | 55,919 | $5.4M | 0.7% |
| BXC BLUELINX HLDGS INC | 86,593 | $5.4M | 0.7% |
| TILE INTERFACE INC | 123,401 | $4.4M | 0.6% |
| PGEN PRECIGEN INC | 706,294 | $4.0M | 0.5% |
| NUVB NUVATION BIO INC | 671,041 | $3.8M | 0.5% |
| FET FORUM ENERGY TECHNOLOGIES INC | 66,611 | $3.3M | 0.4% |
| CRWD CROWDSTRIKE HLDGS INC | 4,169 | $3.2M | 0.4% |
| RILY BRC INC | 2,624,990 | $2.9M | 0.4% |
| KVH INDS INC | 293,132 | $2.9M | 0.4% |
| THE REALREAL INC | 230,657 | $2.7M | 0.4% |
| P EVERPURE INC | 32,385 | $2.6M | 0.3% |
| TNXP TONIX PHARMACEUTICALS HLDG CO | 165,144 | $2.1M | 0.3% |
| MP MATERIALS CORP | 13,906 | $778.9K | 0.1% |
| FOCL EDAP TMS S A | 146,005 | $756.3K | <0.1% |
| ELVA ELECTROVAYA INC | 71,791 | $753.8K | <0.1% |
| SEDG SOLAREDGE TECHNOLOGIES INC | 12,033 | $703.2K | <0.1% |
| CCJ CAMECO CORP | 5,630 | $573.5K | <0.1% |
| EOSE EOS ENERGY ENTERPRISES INC | 60,425 | $355.3K | <0.1% |
| OCC OPTICAL CABLE CORP | 12,629 | $264.8K | <0.1% |
| POCI PRECISION OPTICS CORP INC MASS | 46,630 | $237.8K | <0.1% |
| ALAR ALARUM TECHNOLOGIES LTD | 27,747 | $223.1K | <0.1% |
| FATPIPE INC UT | 29,053 | $183.0K | <0.1% |
| NEUROONE MED TECHNOLOGIES CORP | 43,578 | $132.5K | <0.1% |
| PEOPLE INC | 486 | $22.4K | <0.1% |
Sold out
Held at 2026-03-31, gone by 2026-06-30 · 26 in all · reported value as of 2026-03-31
| Holding | Shares 2026-03-31 | Reported value | % of portfolio then |
|---|---|---|---|
| GSAT GLOBALSTAR INC | 165,665 | $11.0M | 1.7% |
| PRIMORIS SVCS CORP | 48,177 | $6.9M | 1.1% |
| BVS BIOVENTUS INC | 603,258 | $5.5M | 0.9% |
| SNDX SYNDAX PHARMACEUTICALS INC | 198,985 | $4.6M | 0.7% |
| AGIO AGIOS PHARMACEUTICALS INC | 103,177 | $3.5M | 0.6% |
| EVER EVERQUOTE INC | 217,075 | $3.3M | 0.5% |
| CRM SALESFORCE INC | 17,854 | $3.3M | 0.5% |
| VREX VAREX IMAGING CORP | 279,551 | $3.0M | 0.5% |
| INFU INFUSYSTEM HLDGS INC | 299,332 | $2.8M | 0.4% |
| CCLD CARECLOUD INC | 697,836 | $2.5M | 0.4% |
| ONTERRIS INC | 111,473 | $2.4M | 0.4% |
| EXTR EXTREME NETWORKS INC | 158,032 | $2.4M | 0.4% |
| LAW CS DISCO INC | 539,314 | $2.1M | 0.3% |
| GENCOR INDS INC | 129,563 | $1.9M | 0.3% |
| ZS ZSCALER INC | 11,412 | $1.6M | 0.3% |
| ALLT ALLOT LTD | 226,056 | $1.5M | 0.2% |
| ERII ENERGY RECOVERY INC | 132,322 | $1.3M | 0.2% |
| FLNC FLUENCE ENERGY INC | 25,576 | $351.9K | <0.1% |
| BYDDF BYD CO LTD | 20,199 | $275.3K | <0.1% |
| NMTC NEUROONE MED TECHNOLOGIES CORP | 261,953 | $203.4K | <0.1% |
| NSPR INSPIREMD INC | 114,085 | $186.0K | <0.1% |
| GEOS GEOSPACE TECHNOLOGIES CORP | 13,636 | $166.4K | <0.1% |
| AWRE AWARE INC MASS | 43,105 | $53.9K | <0.1% |
| IAC INC | 486 | $19.5K | <0.1% |
| TT TRANE TECHNOLOGIES PLC | 33 | $13.8K | <0.1% |
Biggest increases and decreases
Positions held at both quarter ends, by change in shares · reported value as of 2026-06-30
Increases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| SPROUTS FMRS MKT INC | 10,403 | 55,176 | +430.4% | $4.7M |
| PATRICK INDS INC | 46,228 | 82,960 | +79.5% | $7.4M |
| BMI BADGER METER INC | 9,158 | 28,041 | +206.2% | $4.2M |
| OUST OUSTER INC | 184,585 | 226,028 | +22.5% | $14.1M |
| BDSX BIODESIX INC | 132,086 | 241,915 | +83.1% | $5.5M |
| LGCY LEGACY ED INC | 143,439 | 329,894 | +130.0% | $3.9M |
| ISHARES TR | 2,208 | 7,212 | +226.6% | $2.8M |
| LTRX LANTRONIX INC | 342,489 | 662,070 | +93.3% | $3.9M |
| INFORMATION SVCS GROUP INC | 383,400 | 808,345 | +110.8% | $3.3M |
| JOUT JOHNSON OUTDOORS INC | 62,864 | 94,176 | +49.8% | $4.3M |
| RDVT RED VIOLET INC | 60,942 | 82,555 | +35.5% | $5.3M |
| CODA CODA OCTOPUS GROUP INC | 189,640 | 322,278 | +69.9% | $3.1M |
Decreases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| STRL STERLING INFRASTRUCTURE INC | 32,057 | 16,155 | -49.6% | $13.6M |
| LGND LIGAND PHARMACEUTICALS INC | 58,460 | 43,567 | -25.5% | $13.8M |
| COHU COHU INC | 191,885 | 131,170 | -31.6% | $9.7M |
| GHC GRAHAM CORP | 128,294 | 93,405 | -27.2% | $11.6M |
| MRVL MARVELL TECHNOLOGY INC | 36,203 | 25,911 | -28.4% | $7.7M |
| TSEM TOWER SEMICONDUCTOR LTD | 115,933 | 105,543 | -9.0% | $27.5M |
| AMPX AMPRIUS TECHNOLOGIES INC | 445,441 | 284,595 | -36.1% | $3.9M |
| INSM INSMED INC | 62,676 | 42,991 | -31.4% | $4.6M |
| SMTC SEMTECH CORP | 50,644 | 38,226 | -24.5% | $6.2M |
| WK WORKIVA INC | 36,333 | 728 | -98.0% | $35.3K |
| TVTX TRAVERE THERAPEUTICS INC | 161,705 | 133,866 | -17.2% | $7.6M |
| RPID RAPID MICRO BIOSYSTEMS INC | 883,931 | 362,696 | -59.0% | $627.5K |
CIK 201772 · 13F FILINGS ON EDGAR · INFORMATIONAL ONLY
