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Granahan Investment Management, LLC — 13F Holdings & Portfolio

CIK 1026710 · latest 13F-HR filed 2026-08-14

Backtest portfolio

Granahan Investment Management, LLC manages $2.81B in 13F-reported U.S. long-equity assets across 150 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are PRCH (6.64%), SIMO (5.29%), FPS (3.60%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 22 new positions and exited 21; 91 existing positions rose in reported value and 28 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$2.81B

Long-equity book

Holdings
150

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+22 / −21 / ↑91 / ↓28

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
PRCH6.6% · -2%SIMO5.3% · +128%FPS3.6% · -13%INDI3.1% · -4%VCTR3.0% · -7%FTAI2.8% · -14%MRX2.7% · +2%MOD2.5% · -30%CRS2.1% · -60%NXT2.1% · +17%MGNI2.1% · +21%AXON1.9% · +7%ONTO1.9% · -29%TTMI1.8% · -18%LGND1.7% · +509%KRUS1.6% · +32%RGEN1.6% · +282%APPS1.6% · -51%LTH1.6% · -10%GENI1.5% · +30%CWST1.5% · +74%QXO1.4% · +54%GNRC1.3% · +830%ZETA1.2% · +72%KRNT1.2% · -8%TWST1.2% · newDAVE1.1% · +30%SIBN1.1% · +11%FROG1.0% · +130%FIGR0.9% · -10%CLBT0.9% · -4%GTES0.8% · +9%GLBE0.8% · +16%GRAL0.8% · +547%RBC0.8% · -12%CAVA0.7% · -13%KIDS0.7% · +21%MTRN0.7% · -52%DSGX0.7% · +438%QNT0.7% · newTOST0.7% · +72%TCBI0.7% · +7%SN0.7% · -6%CELC0.7% · +102%UMAC0.7% · -18%FWRG0.6% · +25%NTNX0.6% · +116%LASR0.6% · +28%VECO0.6% · +6%STOK0.5% · +38%BLFS0.5% · -28%AVAV0.5% · +113%ARLO0.5% · -12%ALGM0.5% · -14%MEC0.4% · -16%CHYM0.4% · +31%YSS0.4% · -52%ALKT0.4% · +148%ARXS0.4% · newDOCN0.4% · +109%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 34%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 26, 2026.

Assets Under Management
$2.36B
Discretionary
$2.36B
Employees
20
Accounts
74
Address
404 WYMAN STREET, SUITE 460
WALTHAM, MA 02451
Phone
(781) 890-4412
Website
Name Title / Status Ownership Type
BEJA, ANDREW, LLOYD ControlMANAGING DIRECTOR
since Jan 2018
Less than 5%Individual
GIM HOLDINGS, INC ControlMANAGING MEMBER
since Nov 2021
75% or moreDomestic Entity
GRANAHAN, BRIAN, S. ControlCHIEF COMPLIANCE OFFICER
since Aug 2004
Less than 5%Individual
PAWLOSKI, JENNIFER, M ControlCLERK
since Apr 2019
Less than 5%Individual
ROSE, DAVID, MICHAEL ControlMANAGING DIRECTOR
since Jan 2015
Less than 5%Individual
WHITE, JANE, MORAN ControlPRESIDENT AND CHIEF EXECUTIVE OFFICER
since Feb 1985
Less than 5%Individual
KUDU INVESTMENT MANAGEMENT LLCMEMBER
since Nov 2021
10–25%Domestic Entity
WHITE MOUNTAINS INSURANCE GROUP, LTD. Control
Indirect owner via WM HINSON (BERMUDA) LTD.
SHAREHOLDER
since Oct 2020
75% or moreForeign Entity
WM HINSON (BERMUDA) LTD. Control
Indirect owner via WM INTERNATIONAL HOLDINGS, LTD.
SHAREHOLDER
since Jan 2023
75% or moreForeign Entity
WM INTERNATIONAL HOLDINGS, LTD. Control
Indirect owner via WM REGENT LTD.
SHAREHOLDER
since Oct 2020
75% or moreForeign Entity
WM REGENT LTD. Control
Indirect owner via KUDU INVESTMENT MANAGEMENT LLC
MEMBER
since Oct 2020
75% or moreForeign Entity
Ownership & leadership changes · 7 filings with changes since Apr 2, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 31, 2023 filing
  • AddedWHITE MOUNTAINS INSURANCE GROUP, LTD. · SHAREHOLDER · 75% or more · indirect via WM HINSON (BERMUDA) LTD. · control person
  • AddedWM HINSON (BERMUDA) LTD. · SHAREHOLDER · 75% or more · indirect via WM INTERNATIONAL HOLDINGS, LTD. · control person
  • AddedWM INTERNATIONAL HOLDINGS, LTD. · SHAREHOLDER · 75% or more · indirect via WM REGENT LTD. · control person
  • AddedWM REGENT LTD. · MEMBER · 75% or more · indirect via KUDU INVESTMENT MANAGEMENT LLC · control person
Dec 24, 2021 filing
  • No longer listedHATTON, GARY, CHARLES · DIRECTOR, CHIEF INVESTMENT OFFICER · 25–50% · control person · listed since Jul 1985
  • AddedGIM HOLDINGS, INC · MANAGING MEMBER · 75% or more · control person
  • AddedKUDU INVESTMENT MANAGEMENT LLC · MEMBER · 10–25%
  • ChangedBEJA, ANDREW, LLOYD · ownership 10–25% → Less than 5%
  • ChangedGRANAHAN, BRIAN, S. · ownership 10–25% → Less than 5%
  • ChangedPAWLOSKI, JENNIFER, M · ownership 5–10% → Less than 5%
  • ChangedROSE, DAVID, MICHAEL · ownership 5–10% → Less than 5%
  • ChangedWHITE, JANE, MORAN · ownership 25–50% → Less than 5%
Apr 7, 2021 filing
  • AddedBEJA, ANDREW, LLOYD · MANAGING DIRECTOR · 10–25% · control person
  • AddedROSE, DAVID, MICHAEL · MANAGING DIRECTOR · 5–10% · control person
Apr 3, 2020 filing
  • No longer listedKELLY, THOMAS, JAMES · CLERK · Less than 5% · listed since Feb 1985
  • AddedPAWLOSKI, JENNIFER, M · CLERK · 5–10% · control person
Mar 29, 2019 filing
  • No longer listedGRANAHAN, JOHN, JOSEPH · CHAIRMAN · 10–25% · control person · listed since Feb 1985
  • No longer listedGRANAHAN, ROBERT, FRANCIS · SENIOR VICE PRESIDENT · 10–25% · listed since Jan 2004
Aug 17, 2017 filing
  • ChangedGRANAHAN, JOHN, JOSEPH · ownership 25–50% → 10–25%
Apr 3, 2013 filing
  • AddedGRANAHAN, ROBERT, FRANCIS · SENIOR VICE PRESIDENT · 10–25%
  • ChangedGRANAHAN, BRIAN, S. · ownership Less than 5% → 10–25%
  • ChangedGRANAHAN, JOHN, JOSEPH · ownership 50–75% → 25–50%
  • ChangedWHITE, JANE, MORAN · ownership 10–25% → 25–50%
Apr 2, 2012 filing (earliest on record)
  • ListedGRANAHAN, BRIAN, S. · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedGRANAHAN, JOHN, JOSEPH · CHAIRMAN · 50–75% · control person
  • ListedHATTON, GARY, CHARLES · DIRECTOR, CHIEF INVESTMENT OFFICER · 25–50% · control person
  • ListedKELLY, THOMAS, JAMES · CLERK · Less than 5%
  • ListedWHITE, JANE, MORAN · PRESIDENT AND CHIEF EXECUTIVE OFFICER · 10–25% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Granahan Investment Management, LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 PORCH GROUP INC PRCH 733245104 $186.4M 6.64% 12,393,660 SH
2 SILICON MOTION TECHNOLOGY CO SIMO 82706C108 $148.6M 5.29% 445,752 SH
3 FORGENT POWER SOLUTIONS INC FPS 34631F102 $101.0M 3.60% 1,807,608 SH
4 INDIE SEMICONDUCTOR INC INDI 45569U101 $87.2M 3.11% 19,419,892 SH
5 VICTORY CAP HLDGS INC DEL VCTR 92645B103 $85.3M 3.04% 1,015,343 SH
6 FTAI AVIATION LTD FTAI G3730V105 $79.5M 2.83% 293,722 SH
7 MAREX GROUP PLC MRX G5S37H101 $76.4M 2.72% 1,254,283 SH
8 MODINE MFG CO MOD 607828100 $70.4M 2.51% 263,572 SH
9 CARPENTER TECHNOLOGY CORP CRS 144285103 $59.8M 2.13% 96,981 SH
10 NEXTPOWER INC NXT 65290E101 $59.1M 2.11% 495,938 SH
11 MAGNITE INC MGNI 55955D100 $58.5M 2.09% 3,083,211 SH
12 AXON ENTERPRISE INC AXON 05464C101 $54.3M 1.93% 96,829 SH
13 ONTO INNOVATION INC ONTO 683344105 $53.6M 1.91% 141,568 SH
14 TTM TECHNOLOGIES INC TTMI 87305R109 $50.4M 1.79% 269,330 SH
15 LIGAND PHARMACEUTICALS INC LGND 53220K504 $46.5M 1.66% 147,231 SH
16 KURA SUSHI USA INC KRUS 501270102 $46.2M 1.64% 801,969 SH
17 REPLIGEN CORP RGEN 759916109 $45.3M 1.62% 332,271 SH
18 DIGITAL TURBINE INC APPS 25400W102 $45.1M 1.61% 3,494,200 SH
19 LIFE TIME GROUP HOLDINGS INC LTH 53190C102 $44.3M 1.58% 1,083,587 SH
20 GENIUS SPORTS LIMITED GENI G3934V109 $42.6M 1.52% 7,024,330 SH
21 CASELLA WASTE SYS INC CWST 147448104 $42.3M 1.51% 436,289 SH
22 QXO INC QXO 82846H405 $40.2M 1.43% 2,327,662 SH
23 GENERAC HLDGS INC GNRC 368736104 $36.0M 1.28% 122,872 SH
24 ZETA GLOBAL HOLDINGS CORP ZETA 98956A105 $34.6M 1.23% 1,758,212 SH
25 KORNIT DIGITAL LTD KRNT M6372Q113 $34.4M 1.23% 2,119,398 SH
26 TWIST BIOSCIENCE CORP TWST 90184D100 $32.4M 1.15% 314,882 SH
27 DAVE INC DAVE 23834J201 $31.6M 1.13% 84,897 SH
28 SI BONE INC SIBN 825704109 $31.5M 1.12% 1,931,182 SH
29 JFROG LTD FROG M6191J100 $27.2M 0.97% 299,683 SH
30 FIGURE TECHNOLOGY SOLUTIO FIGR 349381103 $25.9M 0.92% 842,306 SH
31 CELLEBRITE DI LTD CLBT M2197Q107 $24.3M 0.86% 1,661,163 SH
32 GATES INDL CORP PLC GTES G39108108 $23.6M 0.84% 843,441 SH
33 GLOBAL E ONLINE LTD GLBE M5216V106 $22.0M 0.78% 633,327 SH
34 GRAIL INC GRAL 384747101 $21.9M 0.78% 321,176 SH
35 RBC BEARINGS INC RBC 75524B104 $21.9M 0.78% 34,017 SH
36 CAVA GROUP INC CAVA 148929102 $20.8M 0.74% 265,411 SH
37 ORTHOPEDIATRICS CORP KIDS 68752L100 $20.8M 0.74% 1,085,964 SH
38 MATERION CORP MTRN 576690101 $20.8M 0.74% 69,793 SH
39 DESCARTES SYS GROUP INC DSGX 249906108 $20.6M 0.73% 297,257 SH
40 QUANTINUUM INC QNT 74768A104 $19.1M 0.68% 233,540 SH
41 TOAST INC TOST 888787108 $19.1M 0.68% 685,751 SH
42 TEXAS CAP BANCSHARES INC TCBI 88224Q107 $19.0M 0.68% 184,087 SH
43 SHARKNINJA INC SN G8068L108 $18.9M 0.67% 124,271 SH
44 CELCUITY INC CELC 15102K100 $18.7M 0.67% 179,053 SH
45 UNUSUAL MACHS INC UMAC 91532F102 $18.5M 0.66% 829,328 SH
46 FIRST WATCH RESTAURANT GROUP FWRG 33748L101 $17.6M 0.63% 1,363,852 SH
47 NUTANIX INC NTNX 67059N108 $17.2M 0.61% 336,852 SH
48 NLIGHT INC LASR 65487K100 $16.5M 0.59% 236,991 SH
49 VEECO INSTRS INC DEL VECO 922417100 $15.5M 0.55% 204,837 SH
50 STOKE THERAPEUTICS INC STOK 86150R107 $15.1M 0.54% 461,608 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $2.81B 150 0001398344-26-014483
2026-03-31 2026-05-15 $2.07B 149 0001398344-26-009220
2025-12-31 2026-02-17 $2.34B 157 0001398344-26-003202
2025-09-30 2025-11-14 $2.44B 146 0001398344-25-020897
Filer Information
Address
404 WYMAN STREET
SUITE 460
WALTHAM, MA 02451
Phone
(781) 890-4412
Filing Manager
Granahan Investment Management, LLC
WALTHAM, MA
Signatory
Susan Rawley
VP/Operations and Account Administration