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

J. Stern & Co. LLP

$1.1B in tracked AUM across 51 positions as of Q2 2026.

JS
CIK 0002011335 · last filed Jun 30, 2026
Total AUM
$1.1B
as of Q2 2026
Holdings
51
—
positions
Whale Score
70
70
strong
Activity
—
no data
changes this Q
AI Analysis · Q2 2026
Comprehensive Analysis of J. Stern & Co. LLP 13F Filing
1. Portfolio Overview

For the reporting period ending September 30, 2025, J. Stern & Co. LLP managed a portfolio totaling approximately $808.56 million. This represents a significant contraction in assets under management (AUM), with the portfolio value decreasing by 30.9% from $1.17 billion in the previous quarter (June 30, 2025). The portfolio is notably concentrated, comprising only 18 holdings. The drastic reduction in...

2. Key Holdings

The portfolio exhibits a "barbell" style of concentration, with the top five positions accounting for roughly 64% of the total assets.

  • Nvidia (NVDA) remains the dominant holding, despite a reduction of 34,870 shares (-5.8%). It retains the top spot with a value of $169.92 million, representing 21.02% of the portfolio. This indicates a continued, albeit slightly tempered, bullish stance on the semiconductor and AI infrastructure leader.
  • Meta (META) and Alphabet (GOOG/GOOGL) are the second and third largest holdings, respectively. Combined, they make up nearly 25% of the portfolio. J. Stern & Co. added $11.21 million to Meta and notably increased its position in Alphabet Class A by 963.2% (adding $9.73 million), signaling strong confidence in the digital advertising and cloud computing sectors.
  • Eaton (ETN) and Mastercard (MA) round out the top five. Eaton saw a 1.0% increase in value ($10.48 million added), while Mastercard saw a smaller increase of 0.8%. These positions suggest a defensive tilt toward high-quality industrials and financial payments infrastructure.
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
NVDA
NVIDIA CORPORATION
$122M610K11.5%02
GOOG
ALPHABET INC
$110M312K10.4%03
APH
AMPHENOL CORP
$87M493K8.2%04
AMZN
AMAZON COM INC
$82M343K7.7%05
G29183103
EATON CORP PLC
$72M170K6.8%06
MA
MASTERCARD INCORPORATED
$60M116K5.6%07
META
META PLATFORMS INC
$60M106K5.6%08
RTX
RTX CORPORATION
$56M295K5.3%09
ICE
INTERCONTINENTAL EXCHANGE IN
$41M335K3.9%10
AMT
AMERICAN TOWER CORP
$35M212K3.3%

Filing history

2026Q2Jun 30
$1.1B▲ 2.7%
51 positionsView →2026Q1Mar 31
$1.0B▼ 12.1%
49 positionsView →2025Q4Dec 31
$1.2B▲ 45.1%
43 positionsView →2025Q3Sep 30
$809M▼ 30.9%
18 positionsView →2025Q2Jun 30
$1.2B▲ 12.2%
37 positionsLocked2025Q1Mar 31
$1.0B▼ 1.7%
36 positionsLocked2024Q4Dec 31
$1.1B▲ 13.1%
39 positionsLocked2024Q3Sep 30
$938M▲ 11.7%
43 positionsLocked2024Q2Jun 30
$840M▲ 6.2%
34 positionsLocked2024Q1Mar 31
$791M▲ 44.0%
37 positionsLocked2023Q4Dec 31
$549M—
36 positionsLocked