13F Insight
DOSSIER · 13F-HR · Q2 2026

Granahan Investment Management, LLC

$2.8B in tracked AUM across 150 positions as of Q2 2026.

GI
CIK 0001026710 · last filed Jun 30, 2026
Total AUM
$2.8B
as of Q2 2026
Holdings
150
—
positions
Whale Score
62
62
tracked
Activity
—
no data
changes this Q
AI Analysis · Q2 2026

SEC 13F Filing Analysis: Granahan Investment Management, LLC Report Period: Q3 2025 (September 30, 2025)

1. Portfolio Overview

Granahan Investment Management reported a significant contraction in portfolio value during the third quarter of 2025, with total assets under management (AUM) decreasing by 35.7%, from $2.46 billion to $1.58 billion. This reduction does not necessarily indicate net negative performance but likely reflects a combination of market depreciation in held positio...

The portfolio remains highly diversified with 93 total holdings. However, the firm executed a major rotation strategy this quarter. The "Activity Summary" reveals a zero count for unchanged positions, indicating that every single holding in the portfolio was either adjusted, exited, or initiated. The firm sold 19 positions and established 19 new ones, while actively increasing stakes in 12 names and reducing 19 others. This suggests a dynamic, actively managed investment style that is not hesitant to shift capital aggressively to align with changing market conditions or valuation targets.

2. Key Holdings

The portfolio is characterized by a high conviction in its top-tier assets, though the concentration has tightened slightly due to the overall AUM drop. The top 10 holdings account for approximately 38% of the total portfolio value.

Analysis generated by 13F Insight from SEC Form 13F filing data · Q2 2026. Methodology

Quarter at a glance — Q2 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q2 2026.

#HoldingValueSharesWeight
01
PRCH
PORCH GROUP INC
$186M12.4M6.6%02
SIMO
SILICON MOTION TECHNOLOGY CO
$149M446K5.3%03
FPS
FORGENT POWER SOLUTIONS INC
$101M1.8M3.6%04
INDI
INDIE SEMICONDUCTOR INC
$87M19.4M3.1%05
VCTR
VICTORY CAP HLDGS INC DEL
$85M1.0M3.0%06
G3730V105
FTAI AVIATION LTD
$79M294K2.8%07
G5S37H101
MAREX GROUP PLC
$76M1.3M2.7%08
MOD
MODINE MFG CO
$70M264K2.5%09
CRS
CARPENTER TECHNOLOGY CORP
$60M97K2.1%10
NXT
NEXTPOWER INC
$59M496K2.1%

Filing history

2026Q2Jun 30
$2.8B▲ 35.7%
150 positionsView →2026Q1Mar 31
$2.1B▼ 11.5%
149 positionsView →2025Q4Dec 31
$2.3B▲ 47.8%
157 positionsView →2025Q3Sep 30
$1.6B▼ 35.7%
93 positionsView →2025Q2Jun 30
$2.5B▲ 82.6%
153 positionsLocked2025Q1Mar 31
$1.3B▼ 43.8%
103 positionsLocked2024Q4Dec 31
$2.4B▼ 5.8%
180 positionsLocked2024Q3Sep 30
$2.5B▲ 1.7%
187 positionsLocked2024Q2Jun 30
$2.5B▼ 12.2%
180 positionsLocked2024Q1Mar 31
$2.8B▼ 5.9%
181 positionsLocked2023Q4Dec 31
$3.0B▲ 7.9%
180 positionsLocked2023Q3Sep 30
$2.8B▼ 13.6%
183 positionsLocked
Showing 12 of 80