Clearbridge Q1 2026: 25% of $114B Sits in 10 Mega-Caps Plus WMB

Clearbridge Investments filed its Q1 2026 Form 13F-HR on schedule, reporting $114.89 billion in assets under management spread across 500 long positions. The top of the book reads exactly like every other large US growth-equity manager in 2026 — NVDA, MSFT, AAPL, GOOGL, AMZN — and at first glance there is nothing distinctive. Look closer and two patterns stand out: the top 10 absorbs $29.24 billion or roughly 25% of total AUM, which is a real concentration call for a 500-name book; and one of those top 10 names is Williams Companies, the natural-gas pipeline operator, which sits at 1.48% of portfolio between Netflix and the next tech name. That pipeline tilt is the part of the Clearbridge story that a casual 13F summary misses entirely.

Clearbridge is the active-equity arm of Franklin Resources (formerly Legg Mason's growth-equity subsidiary) and runs concentrated growth mandates across both institutional accounts and retail mutual funds branded under the Clearbridge name. The firm's stated philosophy emphasizes durable competitive advantages, secular tailwinds, and free-cash-flow generation. The Q1 2026 book is the cleanest expression of that philosophy in the post-AI cycle: it is overweight semiconductors and platform tech, but it carries a deliberate dividend-and-cash-flow anchor in the energy and payments segments.

The headline numbers

$114.89 billion total AUM, sourced from Clearbridge's own Form 13F-HR header line and cross-checked against the sum of position values ($114.33 billion — the $560 million reconciliation is normal float between report cutoff and aggregation). 500 distinct positions. WhaleScore 73.00 on our internal smart-money rubric, which places Clearbridge in the upper quartile of active managers we track but below the elite of mega-cap concentrated names like Berkshire Hathaway (85.75) or Capital World Investors (75.50).

The top 10 holdings sum to $29.24 billion, or 25.4% of the portfolio. Inside that block:

The chart above orders the top eight by dollar value. NVDA leads at $5.65 billion and 4.94% portfolio weight — meaningfully overweight the index, which currently has NVDA at roughly 6.5% S&P 500 weight, so Clearbridge is actually underweight Nvidia relative to passive benchmarks. That is interesting. The visible "concentration" turns out to be index-tracking on the largest names; the active call is in what comes after.

The top 10 vs the rest

If you take the top 10 versus the remaining 490 positions, the concentration story sharpens:

The remaining 490 positions account for 74.5% of AUM, distributed at average position size around $173 million each. For a $114 billion book that runs 500 deep, this is the textbook "barbell" shape — meaningful concentration in conviction names at the top, broad diversification in the long tail to manage tracking-error and provide bench-strength.

The Williams Companies tilt

The single most distinctive name in the Clearbridge top 10 is Williams Companies (WMB) at $1.69 billion and 1.48% of portfolio. WMB is a natural-gas pipeline operator — about as far from the AI-platform thesis as a US large-cap can sit — and yet Clearbridge has it as a top-10 position alongside Visa and Netflix.

The thesis writes itself once you place it. AI data-center power demand is the single largest US industrial-electricity story of the decade. Williams Companies operates the Transco pipeline system that delivers natural gas from the Marcellus to the Eastern Seaboard, which is exactly where new gas-fired generation capacity is being permitted to serve AI training clusters. The trade is "long AI compute, long the gas pipeline that powers it." That is a pair trade Clearbridge has expressed at material conviction in a single ticker.

WMB at 1.48% portfolio is meaningfully overweight the index. The S&P 500 weight for WMB is below 0.15%. Clearbridge is running roughly a 10x index overweight on natural-gas pipeline infrastructure inside a growth-equity book. That is the kind of position that does not show up in a top-line headline but represents a deliberate macro view.

The tech allocation in context

The full tech-platform block — NVDA, MSFT, AAPL, GOOGL, AMZN, META, AVGO — sums to $23.42 billion, or 20.4% of portfolio. Add NFLX at 1.64% and Visa (V) at 1.71% and the broader "secular growth + platform" block reaches 23.8%. That is index-weight to slightly underweight versus passive benchmarks.

What is conspicuously absent: Tesla. Clearbridge does not hold Tesla in its top 10. Given that Tesla currently sits in the S&P 500 top 10 by weight, this is a deliberate active underweight. Clearbridge's growth philosophy emphasizes durable free-cash-flow generation; Tesla's cash-flow trajectory has been more variable than the AI-platform names.

AUM history and trajectory

The AUM history above shows Clearbridge's reported 13F total across recent quarters. The book has scaled with the broader market through 2025 and 2026, consistent with passive-tracking long exposure to mega-cap tech leadership. The 500-position diversification floor is what keeps the book from becoming a concentrated bet — it is structurally a benchmark-aware growth mandate, not a 30-stock concentrated fund.

What the position pattern tells institutional readers

Clearbridge is positioned as if AI-platform leadership is a slow-burn structural advantage rather than a momentum trade. The top 10 names are the highest-conviction AI beneficiaries, but they are held at portfolio weights at or below their S&P 500 index weights. The active alpha sits in the long tail (490 positions averaging $173 million) and in the WMB pipeline tilt that pairs the AI thesis with infrastructure exposure.

For readers tracking institutional money flows, three observations matter:

1. Clearbridge's "concentration" headline understates the diversification. 25% in top 10 sounds concentrated; in practice the remaining 75% across 490 positions delivers near-index correlation.
2. The WMB position is the active conviction call. 10x index-weight in natural-gas pipeline infrastructure inside a growth book is a deliberate AI-infrastructure pair trade.
3. The absence of Tesla is informative. Clearbridge's philosophy on free-cash-flow durability has produced an explicit active underweight on a name that the S&P index forces on every passive fund.

How to track Clearbridge from here

The next Clearbridge filing — Q2 2026 13F-HR — is due August 14, 2026. Watch three signals:

• Whether the WMB position holds, grows, or trims. Even a modest trim would signal a peak read on the AI-infrastructure pair trade.
• Whether NVDA portfolio weight expands above 5% — currently 4.94%, the implicit ceiling Clearbridge appears to be maintaining.
• Whether new tech-utility crossovers (CEG, VST, TLN, NEE) appear in the top 50, which would confirm the AI-infrastructure theme as a Clearbridge sector emphasis rather than a one-name expression.

Follow the firm via the Clearbridge Investments profile page, which carries the full 500-position holdings table and quarterly history. The institutional signals feed tracks Clearbridge changes alongside peer growth-equity managers in real time. For readers building their own framework for reading a 13F like this, our explainer hub covers concentration analysis, sector tilts, and active-vs-passive signal extraction.

Source: SEC Form 13F-HR filed by Clearbridge Investments, LLC (CIK 0001348883) for the period ending 2026-03-31; available via EDGAR — Clearbridge filer index.