Mitsubishi UFJ AM Q1 2026: $149B Book Tracks US Index Tightly

Mitsubishi UFJ Asset Management Co., Ltd. filed its Q1 2026 Form 13F-HR reporting $148.96 billion in US-equity assets across 500 long positions. The firm is the asset-management arm of Mitsubishi UFJ Financial Group, Japan's largest banking group, and the US-equity book represents one of the larger non-domestic 13F filers we track. The top 10 is interesting precisely because it is so close to the S&P 500 index — Nvidia at 6.71%, Apple at 5.88%, Microsoft at 4.84%, and seven other mega-caps that together absorb $49.62 billion or 33.3% of AUM. Unlike most US-domiciled diversified-active managers, Tesla appears in the top 10 at 1.68% portfolio. That single inclusion tells you Mitsubishi UFJ is running a US-equity mandate designed to capture the S&P 500 leadership cohort tightly rather than to express discretionary stock-picker conviction.

This is the Japanese-institutional-mandate model. US-equity exposure for a Japanese pension fund, life insurer, or wealth-management client typically requires close benchmark tracking — the Japanese client is paying for currency-hedged dollar-denominated US-equity exposure, not for an active manager's view on whether to underweight Apple. The result is a 13F shape that resembles a slightly-active version of the index, with concentration at the top driven by index weights rather than by stock-picker conviction.

The book at a glance

$148.96 billion total AUM, 500 long positions, WhaleScore 73.00 on our smart-money rubric. The top 10 absorbs $49.62 billion or 33.3% of AUM — high by US-active standards, low by passive-index standards.

Reading every position against the S&P 500 index weight

The fundamental question for any large 13F is how each position weight compares to its S&P 500 index weight. For Mitsubishi UFJ:

• NVDA at 6.71% versus index weight of ~6.5% — slight overweight
• AAPL at 5.88% versus index weight of ~6.1% — slight underweight
• MSFT at 4.84% versus index weight of ~7.2% — meaningful underweight
• AMZN at 3.67% versus index weight of ~3.9% — slight underweight
• GOOGL + GOOG combined at 5.39% versus combined index of ~6.0% — slight underweight
• AVGO at 2.33% versus index weight of ~2.1% — slight overweight
• META at 1.99% versus index weight of ~2.5% — slight underweight
• TSLA at 1.68% versus index weight of ~1.5% — slight overweight
• V at 1.37% versus index weight of ~0.5% — meaningful overweight

The position-weight distribution is much tighter around index weights than typical US-active managers. Most US-domiciled active funds run NVDA at 3-5%, MSFT at 3-4%, and have explicit zero-Tesla positions. Mitsubishi UFJ holds every name within 1-2 percentage points of its index weight, with Tesla included at slight overweight.

Why Tesla in the top 10 is the giveaway

Tesla's S&P 500 index weight is approximately 1.5%. Active US managers with explicit value or quality factor tilts typically zero-weight Tesla (the multiple compresses badly on value screens, and the cash-flow volatility hurts quality scores). Across the four US-active managers we've analyzed in the recent batch — Clearbridge, MFS, Neuberger Berman, State Farm Mutual — Tesla is absent from each top 10.

Mitsubishi UFJ holding Tesla at 1.68% portfolio means the mandate is structurally not allowed to make discretionary zero-weights on S&P 500 top-15 names. The firm tracks the index, with modest active adjustments around the edges. This is a closet-indexing mandate by structure, not by accident.

The Visa overweight is the real active call

The most distinctive single-name decision in the Mitsubishi UFJ book is Visa at 1.37% portfolio, roughly a 2.7x overweight versus its 0.5% S&P index weight. Visa is one of two payments-network duopolists (with Mastercard), and the overweight reflects a structural view that digital-payments share growth is durable.

This is the same Visa overweight that Schroder Investment Management runs (1.93% portfolio, 4x overweight). Two non-US-domiciled asset managers showing structurally overweight payments-network exposure is a pattern worth tracking. The view: Visa's transaction-rail moat plus pricing power produces compounding earnings growth that outperforms generic mega-cap-tech.

The top 10 vs the tail

Top 10 at 33.3% versus 66.7% across the remaining 490 positions. The tail averages $199 million per position. This is structurally similar to the Schroder book's concentration — moderate-to-high top-10 weight, broad diversification in the tail.

What the index-tracking shape tells institutional readers

1. Mitsubishi UFJ is structurally less differentiated than US-active peers. The position-weight pattern is too close to S&P 500 for the book to be running discretionary stock-picker conviction.
2. The Visa overweight is the cleanest active signal. Outside of the index-tracked top 10 names, the Visa position is the deliberate active call.
3. Tesla inclusion is the structural fingerprint of a non-US mandate. US-domiciled active managers typically reject Tesla on factor grounds; Mitsubishi UFJ keeping it at index weight reflects the Japanese institutional preference for benchmark-tracking US exposure.

AUM trajectory

The reported US 13F AUM has scaled steadily through 2024-2026, consistent with both market beta exposure and steady institutional inflows from Japanese clients seeking US-dollar-denominated exposure during yen weakness periods. The 500-position floor is stable, supporting the index-tracking-with-active-overlay reading.

What to track

1. Mitsubishi UFJ's Q2 2026 13F (due August 14, 2026). Watch whether the Tesla position holds in the top 10. A drop would signal a small shift in the mandate's flexibility to underweight specific large-cap names.
2. The Visa position evolution. 1.37% portfolio is the most concentrated active call. Sustained or growing position confirms the payments-platform thesis.
3. Yen-dollar exchange rate. Japanese institutional flows into US equity track yen weakness — if the yen strengthens materially, Mitsubishi UFJ's US-equity AUM trajectory may compress as Japanese clients rebalance back to domestic exposure.

Read the full holdings table on the Mitsubishi UFJ Asset Management profile page. Compare against other non-US-domiciled large 13F filers through the institutional signals feed. For a primer on identifying index-tracking mandates inside active 13F filings, see our explainer hub.

Source: SEC Form 13F-HR filed by Mitsubishi UFJ Asset Management Co., Ltd. (CIK 0001466546) for the period ending 2026-03-31; available via EDGAR — Mitsubishi UFJ filer index.