ESSEX INVESTMENT MANAGEMENT CO LLC
Long book
$631.7M
Q1 2026
Positions
305
Top-10 weight
20%
concentration
Last quarter
+21.0%
SPY +14.8%
Turnover
17%
of book per quarter
Strategy in plain words
auto-generated from filingsESSEX INVESTMENT MANAGEMENT CO LLC is an institutional manager, running a $631.7M US long book across 305 positions.
The portfolio is broadly diversified across 305 positions (top 10 only 20%). Turnover is modest: positions are typically held for years. Current anchor positions: TOWER SEMICONDUCTOR LTD, LINCOLN EDUCATIONAL SERVICES, STERLING INFRASTRUCTURE INC, KINIKSA PHARMACEUTICALS INTE, LIGAND PHARMACEUTICALS.
Over the last 9 quarters its long book ran on average 2.9pp per quarter ahead of the S&P 500, beating the index in 6 of 9 quarters. Signal value of individual moves is limited — treat changes as weak evidence.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-1.0%
Q2 2024
+9.6%
Q3 2024
+5.7%
Q4 2024
-10.9%
Q1 2025
+20.9%
Q2 2025
+19.7%
Q3 2025
+1.8%
Q4 2025
-0.2%
Q1 2026
+21.0%
Sector allocation
Technology 28%
Industrials 23%
Healthcare 20%
Services media 8%
Financials 5%
Other 4%
Energy 3%
Communications 3%
Long book by quarter
What does ESSEX INVESTMENT own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| TSEM TOWER SEMICONDUCTOR LTD | Technology | 115.9K | $20.3M | 3.2% | -39.8% |
| LINC LINCOLN EDUCATIONAL SERVICES | Services media | 355.3K | $14.5M | 2.3% | -8.6% |
| STRL STERLING INFRASTRUCTURE INC | Industrials | 32.1K | $13.1M | 2.1% | -28.3% |
| KNSA KINIKSA PHARMACEUTICALS INTE | Healthcare | 249.3K | $12.0M | 1.9% | -0.7% |
| LGND LIGAND PHARMACEUTICALS | Healthcare | 58.5K | $11.7M | 1.8% | -2.6% |
| DRS LEONARDO DRS INC | Technology | 261.5K | $11.6M | 1.8% | +1.8% |
| KTOS KRATOS DEFENSE & SECURITY | Industrials | 158.8K | $11.2M | 1.8% | -16.5% |
| GSAT GLOBALSTAR INC | Communications | 165.7K | $11.0M | 1.7% | -1.0% |
| INSM INSMED INC | Healthcare | 62.7K | $10.2M | 1.6% | +0.4% |
| GHM GRAHAM CORP | Industrials | 128.3K | $10.1M | 1.6% | -8.8% |
| MIRM MIRUM PHARMACEUTICALS INC | Healthcare | 108.3K | $10.0M | 1.6% | -2.7% |
| CECO CECO ENVIRONMENTAL CORP | Industrials | 157.2K | $9.4M | 1.5% | +1.8% |
| HCI HCI GROUP INC | Financials | 57.6K | $8.9M | 1.4% | -2.7% |
| AGX ARGAN INC | Industrials | 16.1K | $8.8M | 1.4% | -41.7% |
| AAPL APPLE INC | Technology | 32.6K | $8.3M | 1.3% | -6.6% |
| AEM AGNICO EAGLE MINES LTD | Materials | 38.6K | $7.8M | 1.2% | -3.4% |
| AMSC AMERICAN SUPERCONDUCTOR CORP | Industrials | 227.6K | $7.7M | 1.2% | +5.8% |
| AMPX AMPRIUS TECHNOLOGIES INC | Technology | 445.4K | $7.5M | 1.2% | -13.8% |
| GEV GE VERNOVA INC | Industrials | 8.3K | $7.3M | 1.1% | -3.3% |
| PRIM PRIMORIS SERVICES CORP | Industrials | 48.2K | $6.9M | 1.1% | -5.5% |
| ADPT ADAPTIVE BIOTECHNOLOGIES | Healthcare | 493.4K | $6.8M | 1.1% | -21.0% |
| TTI TETRA TECHNOLOGIES INC | Energy | 774.1K | $6.6M | 1.0% | +1.8% |
| GS GOLDMAN SACHS GROUP INC | Financials | 7.6K | $6.4M | 1.0% | -12.7% |
| WLDN WILLDAN GROUP INC | Services media | 78.3K | $6.0M | 0.9% | +1.8% |
| COHU COHU INC | Technology | 191.9K | $5.9M | 0.9% | +1.8% |
| MSFT MICROSOFT CORP | Technology | 15.8K | $5.8M | 0.9% | -10.3% |
| MIR MIRION TECHNOLOGIES INC | Other | 309.1K | $5.7M | 0.9% | +1.9% |
| AMZN AMAZON.COM INC | Consumer discretionary | 27.2K | $5.7M | 0.9% | -5.6% |
| OII OCEANEERING INTL INC | Energy | 158.4K | $5.6M | 0.9% | +1.9% |
| WMS ADVANCED DRAINAGE SYSTEMS IN | Other | 40.6K | $5.6M | 0.9% | -5.3% |
| BVS BIOVENTUS INC - A | Healthcare | 603.3K | $5.5M | 0.9% | +55.5% |
| MAMA MAMA'S CREATIONS INC | Consumer staples | 341.7K | $5.2M | 0.8% | +1.8% |
| BWXT BWX TECHNOLOGIES INC | Industrials | 25.6K | $5.2M | 0.8% | -6.2% |
| PATK PATRICK INDUSTRIES INC | Industrials | 46.2K | $5.1M | 0.8% | +0.6% |
| LYTS LSI INDUSTRIES INC | Industrials | 274.1K | $5.1M | 0.8% | +1.8% |
| ORN ORION GROUP HOLDINGS INC | Industrials | 461.8K | $5.0M | 0.8% | +2.7% |
| NVCR NOVOCURE LTD | Healthcare | 452.4K | $4.9M | 0.8% | New |
| TVTX TRAVERE THERAPEUTICS INC | Healthcare | 161.7K | $4.8M | 0.8% | +1.9% |
| AIP ARTERIS INC | Technology | 290.3K | $4.8M | 0.8% | +1.8% |
| AVPT AVEPOINT INC | Technology | 498.5K | $4.7M | 0.8% | -1.9% |
| ASML ASML HOLDING NV-NY REG SHS | Industrials | 3.6K | $4.7M | 0.7% | -6.6% |
| SNDX SYNDAX PHARMACEUTICALS INC | Healthcare | 199.0K | $4.6M | 0.7% | New |
| CXDO CREXENDO INC | Communications | 743.0K | $4.6M | 0.7% | +1.8% |
| ECG EVERUS CONSTRUCTION GROUP | Industrials | 38.1K | $4.5M | 0.7% | +1.9% |
| XERS XERIS BIOPHARMA HOLDINGS INC | Healthcare | 747.8K | $4.3M | 0.7% | +1.8% |
| GMED GLOBUS MEDICAL INC - A | Healthcare | 50.0K | $4.3M | 0.7% | -2.7% |
| AMBA AMBARELLA INC | Technology | 82.4K | $4.2M | 0.7% | -1.7% |
| XZO EXZEO GROUP INC | Technology | 288.1K | $4.2M | 0.7% | -1.0% |
| FEIM FREQUENCY ELECTRONICS INC | Technology | 93.0K | $4.1M | 0.7% | +1.8% |
| JAZZ JAZZ PHARMACEUTICALS PLC | Healthcare | 21.8K | $4.1M | 0.7% | -6.1% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 11, 2026 | 305 | $631.7M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 13, 2026 | 306 | $655.9M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 6, 2025 | 299 | $653.4M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 12, 2025 | 298 | $550.0M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 7, 2025 | 303 | $479.4M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 7, 2025 | 307 | $556.1M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Oct 10, 2024 | 302 | $573.7M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 12, 2024 | 302 | $534.7M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 3, 2024 | 306 | $506.7M | canonical | SEC ↗ |
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