DOSSIER · 13F-HR · Q1 2026

BAMCO INC /NY/

$33.1B in tracked AUM across 326 positions as of Q1 2026.

BI
CIK 0001017918 · last filed Mar 31, 2026
Total AUM
$33.1B
as of Q1 2026
Holdings
326
positions
Whale Score
72
72
strong
Activity
no data
changes this Q
AI Analysis · Q1 2026
Comprehensive Analysis of BAMCO INC /NY/ SEC 13F Filing
1. Portfolio Overview

For the quarter ending September 30, 2025, BAMCO INC /NY/ reported a total portfolio value of $27.53 billion, spread across 199 holdings. This represents a significant decrease in portfolio value of -25.4% compared to the previous quarter's value of $36.89 billion. This reduction is attributable to a combination of market depreciation and active portfolio deleveraging, as evidenced by the substantial...

The portfolio demonstrates a high-conviction strategy with notable concentration risk. The top ten holdings account for approximately 53.5% of the total portfolio value, indicating a preference for concentrated bets on specific business models rather than broad index-like diversification. The firm is highly active, with zero positions remaining unchanged; 17 new positions were initiated, 17 were completely sold, 20 were reduced, and 13 were increased.

2. Key Holdings
Analysis generated by 13F Insight from SEC Form 13F filing data · Q1 2026. Methodology

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
TSLA
TESLA INC
$4.4B11.9M13.4%
02
G0450A105
ARCH CAP GROUP LTD
$1.6B16.7M4.8%
03
MSCI
MSCI INC
$1.5B2.7M4.4%
04
GWRE
GUIDEWIRE SOFTWARE INC
$987M6.6M3.0%
05
IT
GARTNER INC
$937M5.9M2.8%
06
IDXX
IDEXX LABS INC
$918M1.6M2.8%
07
H
HYATT HOTELS CORP
$912M6.3M2.8%
08
FIGS
FIGS INC
$886M60.0M2.7%
09
FDS
FACTSET RESH SYS INC
$815M3.8M2.5%
10
CHH
CHOICE HOTELS INTL INC
$796M7.7M2.4%

Filing history

2026Q1Mar 31
$33.1B 10.2%
326 positionsView →
2025Q4Dec 31
$36.9B 34.1%
327 positionsView →
2025Q3Sep 30
$27.5B 25.4%
199 positionsView →
2025Q2Jun 30
$36.9B 8.3%
306 positionsLocked
2025Q1Mar 31
$34.0B 12.0%
314 positionsLocked
2024Q4Dec 31
$38.7B 2.6%
316 positionsLocked
2024Q3Sep 30
$37.7B 8.0%
328 positionsLocked
2024Q2Jun 30
$34.9B 6.9%
329 positionsLocked
2024Q1Mar 31
$37.5B 0.1%
332 positionsLocked
2023Q4Dec 31
$37.5B 9.1%
330 positionsLocked
2023Q3Sep 30
$34.4B 4.7%
334 positionsLocked
2023Q2Jun 30
$36.1B 8.4%
343 positionsLocked
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