CIK: 0001026710
Total reported value
$2.1B
Reporting period: 2026-03-31 · Number of holdings: 149
Granahan Investment Management, LLC disclosed 149 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $2.1B and a quarterly turnover rate of 49.0%.
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Granahan Investment Management, LLC's disclosed holdings carry a Herfindahl concentration index of 0.018 — mathematically equivalent to about 57 equally-sized positions, well below its 149 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.28), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 44% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Trim GENI
-31.5% -$62.7M
Add MOD
+15.7% $38.2M
Trim ZETA
-60.9% -$37.0M
Trim PHR
-58.8% -$32.3M
Trim CLBT
-43.1% -$31.1M
Trim GLBE
-54.1% -$30.0M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | CRS | Carpenter Technology | Stock-Industrials | 4.57% | +0.97% | -10.37% | |
| 2 | PRCH | Porch Group INC | Stock-Other | 4.40% | -0.13% | +9.36% | |
| 3 | FTAI | FTAI Aviation Ltd. | Stock-Industrials | 4.03% | +1.10% | -2.03% | |
| 4 | MOD | Modine Manufacturing Co | Stock-Consumer Disc | 3.96% | +2.09% | +15.66% | |
| 5 | VCTR | Victory Capital Holding - A | Stock-Other | 3.44% | — | +1.13% | |
| 6 | INDI | Indie Semiconductor Inc-a | Stock-Other | 3.16% | — | +17.82% | |
| 7 | FPS | Forgent Power Solutions INC | Stock-Other | 2.93% | +2.93% | NEW | |
| 8 | MRX | Marex Group plc | Stock-Other | 2.64% | — | -11.13% | |
| 9 | NXT | Nextpower Inc-cl A | Stock-Tech | 2.47% | +1.03% | +10.33% | |
| 10 | KRUS | Kura Sushi USA Inc-class A | Stock-Other | 2.05% | — | -22.77% | |
| 11 | ONTO | Onto Innovation INC | Stock-Tech | 1.97% | +0.64% | +1.04% | |
| 12 | AXON | Axon Enterprise INC | Stock-Industrials | 1.86% | — | +19.78% | |
| 13 | FIX | Comfort Systems USA INC | Stock-Industrials | 1.74% | +0.70% | -0.03% | |
| 14 | KRNT | Kornit Digital Ltd. | Stock-Other | 1.63% | — | -10.55% | |
| 15 | LTH | Life Time Group Holdings INC | Stock-Other | 1.56% | -0.33% | -27.66% | |
| 16 | TTMI | Ttm Technologies | Stock-Tech | 1.54% | +0.81% | +32.36% | |
| 17 | FIGR | Figure Technology Solut-cl A | Stock-Other | 1.54% | — | +40.55% | |
| 18 | MGNI | Magnite INC | Stock-Other | 1.47% | -0.70% | -18.05% | |
| 19 | QXO | Qxo INC | Stock-Industrials | 1.42% | +0.76% | +88.78% | |
| 20 | SMTC | Semtech CORP | Stock-Tech | 1.38% | — | -11.38% | |
| 21 | CAVA | Cava Group INC | Stock-Consumer Disc | 1.19% | +0.61% | +31.67% | |
| 22 | RMBS | Rambus INC | Stock-Tech | 1.17% | — | +5.55% | |
| 23 | SRAD | Sportradar Group AG | Stock-Other | 1.17% | -0.53% | -13.82% | |
| 24 | CLBT | Cellebrite DI Ltd. | Stock-Other | 1.16% | -1.20% | -43.09% | |
| 25 | GENI | Genius Sports Limited | Stock-Other | 1.15% | -2.56% | -31.45% | |
| 26 | SIBN | Si-bone INC | Stock-Other | 1.06% | — | +97.59% | |
| 27 | SIMO | Silicon Motion Technol-adr | Stock-Other | 1.06% | — | -14.79% | |
| 28 | YSS | York Space Systems INC | Stock-Other | 1.04% | +1.04% | NEW | |
| 29 | RBC | RBC Bearings INC | Stock-Industrials | 1.01% | — | -21.05% | |
| 30 | MTRN | Materion CORP | Stock-Other | 1.01% | — | +4.52% | |
| 31 | APPS | Digital Turbine INC | Stock-Other | 0.99% | -0.37% | +12.02% | |
| 32 | CWST | Casella Waste Systems Inc-a | Stock-Industrials | 0.96% | — | -2.89% | |
| 33 | GTES | Gates Industrial Corporation plc | Stock-Industrials | 0.85% | — | -7.20% | |
| 34 | GLBE | Global-E Online Ltd. | Stock-Other | 0.82% | -1.19% | -54.11% | |
| 35 | ARLO | Arlo Technologies INC | Stock-Other | 0.80% | +0.60% | +245.61% | |
| 36 | ZETA | Zeta Global Holdings Corp-a | Stock-Tech | 0.79% | -1.49% | -60.86% | |
| 37 | TCBI | Texas Capital Bancshares INC | Stock-Financials | 0.79% | — | -3.93% | |
| 38 | AMRC | Ameresco Inc-cl A | Stock-Other | 0.78% | -0.28% | -25.70% | |
| 39 | LEU | Centrus Energy Corp-class A | Stock-Energy | 0.75% | — | +19.21% | |
| 40 | KIDS | Orthopediatrics CORP | Stock-Other | 0.69% | — | +35.06% | |
| 41 | STRL | Sterling Infrastructure INC | Stock-Industrials | 0.68% | — | -41.96% | |
| 42 | SN | SharkNinja, Inc. | Stock-Consumer Disc | 0.67% | — | +16.72% | |
| 43 | COMP | Compass INC - Class A | Stock-Real Estate | 0.67% | -0.75% | -39.89% | |
| 44 | BLFS | Biolife Solutions INC | Stock-Other | 0.67% | — | +49.69% | |
| 45 | ALHC | Alignment Healthcare INC | Stock-Other | 0.67% | — | +4.14% | |
| 46 | UMAC | Unusual Machines INC /us | Stock-Other | 0.61% | — | -11.96% | |
| 47 | AIP | Arteris INC | Stock-Other | 0.57% | +0.41% | +201.01% | |
| 48 | FWRG | First Watch Restaurant Group | Stock-Other | 0.55% | -0.39% | -25.03% | |
| 49 | DAVE | Dave INC | Stock-Other | 0.55% | +0.53% | +3325.54% | |
| 50 | IRTC | Irhythm Holdings INC | Stock-Healthcare | 0.55% | +0.44% | +567.89% |
Performance for Q3 2026
+11.8%
Performance Last 4 Quarters
+12.5%
Based on 78% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 149 | $2.1B | 49 | |
| 2025-12-31 | 157 | $2.3B | 45 | |
| 2025-09-30 | 146 | $2.4B | 58 | |
| 2025-06-30 | 153 | $2.5B | 0 | |
| 2025-03-31 | 159 | $2.0B | 100 | |
| 2024-12-31 | 180 | $2.4B | 0 | |
| 2024-09-30 | 187 | $2.5B | 0 | |
| 2024-06-30 | 180 | $2.5B | 0 | |
| 2024-03-31 | 181 | $2.8B | 0 | |
| 2023-12-31 | 180 | $3.0B | 0 | |
| 2023-09-30 | 183 | $2.8B | 0 | |
| 2023-06-30 | 175 | $3.2B | 0 | |
| 2023-03-31 | 165 | $3.3B | 0 | |
| 2022-12-31 | 170 | $3.3B | 0 | |
| 2022-09-30 | 176 | $3.1B | 0 | |
| 2022-06-30 | 172 | $2.9B | 0 | |
| 2022-03-31 | 178 | $4.0B | 0 | |
| 2021-12-31 | 186 | $4.9B | 0 | |
| 2021-09-30 | 193 | $5.3B | 0 | |
| 2021-06-30 | 193 | $5.4B | 94 | |
| 2021-03-31 | 191 | $4.7B | 40 | |
| 2020-12-31 | 192 | $4.5B | 62 | |
| 2020-09-30 | 180 | $2.9B | 37 | |
| 2020-06-30 | 191 | $2.8B | 52 | |
| 2020-03-31 | 184 | $1.9B | 39 | |
| 2019-12-31 | 182 | $2.2B | 34 | |
| 2019-09-30 | 181 | $1.8B | 31 | |
| 2019-06-30 | 184 | $2.0B | 26 | |
| 2019-03-31 | 189 | $1.9B | 44 | |
| 2018-12-31 | 193 | $1.4B | 41 | |
| 2018-09-30 | 201 | $1.8B | 32 | |
| 2018-06-30 | 207 | $1.7B | 42 | |
| 2018-03-31 | 197 | $1.4B | 39 | |
| 2017-12-31 | 229 | $1.3B | 38 | |
| 2017-09-30 | 222 | $1.2B | 32 | |
| 2017-06-30 | 229 | $1.1B | 40 | |
| 2017-03-31 | 211 | $996.4M | 100 | |
| 2016-12-31 | 229 | $2.9B | 36 | |
| 2016-09-30 | 233 | $3.1B | 28 | |
| 2016-06-30 | 206 | $2.7B | 32 | |
| 2016-03-31 | 210 | $2.7B | 28 | |
| 2015-12-31 | 240 | $2.9B | 31 | |
| 2015-09-30 | 255 | $3.2B | 40 | |
| 2015-06-30 | 236 | $3.5B | 23 | |
| 2015-03-31 | 231 | $3.5B | 36 | |
| 2014-12-31 | 211 | $3.4B | 24 | |
| 2014-09-30 | 206 | $3.2B | 22 | |
| 2014-06-30 | 210 | $3.4B | 25 | |
| 2014-03-31 | 204 | $3.7B | 29 | |
| 2013-12-31 | 209 | $3.9B | 38 | |
| 2013-09-30 | 213 | $3.8B | 35 | |
| 2013-06-30 | 226 | $3.5B | 0 |
Granahan Investment Management, LLC's most significant position changes for 2026-03-31: Sold out: Oddity Tech Ltd. (ODD); New buy: Forgent Power Solutions INC (FPS); New buy: York Space Systems INC (YSS); Sold out: Klaviyo Inc-a (KVYO); Sold out: Wealthfront CORP (WLTH).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | MOD | Modine Manufacturing Co | +2.1% | +15.66% | Add |
| 2 | FTAI | FTAI Aviation Ltd. | +1.1% | -2.03% | Trim |
| 3 | NXT | Nextpower Inc-cl A | +1% | +10.33% | Add |
| 4 | CRS | Carpenter Technology | +1% | -10.37% | Trim |
| 5 | TTMI | Ttm Technologies | +0.8% | +32.36% | Add |
| 6 | QXO | Qxo INC | +0.8% | +88.78% | Add |
| 7 | FIX | Comfort Systems USA INC | +0.7% | -0.03% | Trim |
| 8 | ONTO | Onto Innovation INC | +0.6% | +1.04% | Add |
| 9 | CAVA | Cava Group INC | +0.6% | +31.67% | Add |
| 10 | ARLO | Arlo Technologies INC | +0.6% | +245.61% | Add |
| 11 | DAVE | Dave INC | +0.5% | +3325.54% | Add |
| 12 | IRTC | Irhythm Holdings INC | +0.4% | +567.89% | Add |
| 13 | AIP | Arteris INC | +0.4% | +201.01% | Add |
| 14 | PRCH | Porch Group INC | -0.1% | +9.36% | Add |
| 15 | ENVX | Enovix CORP | -0.2% | -19.09% | Trim |
| 16 | BETA | Beta Technologies INC -cl A | -0.2% | -1.46% | Trim |
| 17 | AZTA | Azenta INC | -0.3% | -79.97% | Trim |
| 18 | AMRC | Ameresco Inc-cl A | -0.3% | -25.70% | Trim |
| 19 | STEP | Stepstone Group Inc-class A | -0.3% | -26.70% | Trim |
| 20 | CRDO | Credo Technology Group Holding Ltd | -0.3% | -38.87% | Trim |
| 21 | LTH | Life Time Group Holdings INC | -0.3% | -27.66% | Trim |
| 22 | APPS | Digital Turbine INC | -0.4% | +12.02% | Add |
| 23 | FWRG | First Watch Restaurant Group | -0.4% | -25.03% | Trim |
| 24 | TRNS | Transcat INC | -0.5% | -96.90% | Trim |
| 25 | SRAD | Sportradar Group AG | -0.5% | -13.82% | Trim |
| 26 | MGNI | Magnite INC | -0.7% | -18.05% | Trim |
| 27 | COMP | Compass INC - Class A | -0.8% | -39.89% | Trim |
| 28 | TOST | Toast Inc-class A | -1.1% | -61.52% | Trim |
| 29 | GLBE | Global-E Online Ltd. | -1.2% | -54.11% | Trim |
| 30 | CLBT | Cellebrite DI Ltd. | -1.2% | -43.09% | Trim |
| 31 | PHR | Phreesia INC | -1.3% | -58.84% | Trim |
| 32 | ZETA | Zeta Global Holdings Corp-a | -1.5% | -60.86% | Trim |
| 33 | GENI | Genius Sports Limited | -2.6% | -31.45% | Trim |
| 34 | ODD | Oddity Tech Ltd. | — | EXIT | Sold out |
| 35 | FPS | Forgent Power Solutions INC | — | NEW | New buy |
| 36 | YSS | York Space Systems INC | — | NEW | New buy |
| 37 | KVYO | Klaviyo Inc-a | — | EXIT | Sold out |
| 38 | WLTH | Wealthfront CORP | — | EXIT | Sold out |
| 39 | HUBS | Hubspot INC | — | EXIT | Sold out |
| 40 | LASR | Nlight INC | — | NEW | New buy |
| 41 | LITE | Lumentum Holdings INC | — | EXIT | Sold out |
| 42 | STKL | Sunopta INC | — | EXIT | Sold out |
| 43 | AVAV | Aerovironment INC | — | NEW | New buy |
| 44 | VITL | Vital Farms INC | — | EXIT | Sold out |
| 45 | LENZ | Lenz Therapeutics INC | — | EXIT | Sold out |
| 46 | LIFE | Ethos Technologies INC Cl-a | — | NEW | New buy |
| 47 | CALY | Callaway Golf Company | — | NEW | New buy |
| 48 | RDNT | Radnet INC | — | NEW | New buy |
| 49 | EXK | Exact Sciences CORP | — | EXIT | Sold out |
| 50 | CVLT | Commvault Systems INC | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-15 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-14 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-14 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-15 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-14 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-14 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-14 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-14 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-14 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-14 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-15 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-14 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-15 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-16 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-15 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-16 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-17 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-12 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-12 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-14 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-12 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-15 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-14 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-13 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-13 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-15 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-14 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-12 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-11 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-12 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-13 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-12 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-17 | Amendment | View on EDGAR |
| 2015-09-30 | 2015-11-12 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-12 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-10 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-20 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-10 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-07-22 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-15 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-30 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-31 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-05 | 13F-HR | View on EDGAR |
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