What did American Century report in Q4 2025 13F assets?

AMERICAN CENTURY COMPANIES INC reported a canonical 13F AUM of $198.97B for 2025Q4.

Which stocks are the largest in American Century's Q4 2025 filing?

The largest disclosed holdings are NVDA ($11.81B), MSFT ($7.31B), AAPL ($7.08B), AMZN ($6.14B), and GOOGL ($5.91B).

How concentrated is American Century's portfolio in Q4 2025?

Top-1 concentration is 7.3%, top-5 is 23.6%, and top-10 is 33.4%, showing conviction with still-moderate diversification at scale.

How did American Century's AUM change through 2025?

AUM moved from $162.99B in Q1 to $184.05B in Q2, then to $196.53B in Q3 and $198.97B in Q4.

Why is this filing important for investors?

It demonstrates a large institution leaning into mega-cap winners while keeping concentration limits that preserve portfolio flexibility.

Research

American Century's $198.97B Q4 Book: NVIDIA Weight Climbs, But Risk Stays Managed

AMERICAN CENTURY COMPANIES INC reported $198.97B in Q4 2025, led by an $11.81B NVIDIA stake, while keeping top-10 concentration at 33.4% across a 500-position portfolio.

By Marcus Chen, Senior Market Analyst

PublishedMarch 22, 2026UpdatedMarch 23, 2026

AMERICAN CENTURY COMPANIES INC closed Q4 2025 at $198.97B in reported 13F AUM, with its largest disclosed position in NVIDIA (NVDA) at $11.81B. A 7.28% top holding is meaningful, but the broader construction still matters more: the top-10 basket is 33.4%, which signals conviction without crossing into extreme concentration territory for a portfolio this large.

TL;DR

Quarter: 2025Q4
Canonical AUM: $198.97B
Holdings value sum: $162.16B
Positions: 500
Top position: NVDA at $11.81B (7.28%)
Top-5 concentration: 23.6%
Top-10 concentration: 33.4%
AUM trajectory: $162.99B (2025Q1) to $198.97B (2025Q4)

Filing Snapshot

AMERICAN CENTURY COMPANIES INC reported a WhaleScore of 70.50 in Q4 2025 with 500 positions. The filing reflects scale, clear mega-cap bias, and a gradual increase in AUM through the back half of the year.

Metric	Value
Canonical AUM	$198.97B
Holdings value sum	$162.16B
Positions	500
Top-1 concentration	7.3%
Top-5 concentration	23.6%
Top-10 concentration	33.4%

Top Holdings: Clear Winners, Measured Position Sizing

The top stack — NVDA, MSFT, AAPL, AMZN, and GOOGL — captures the market’s dominant earnings engines. The key is implementation: no single name crosses 8%, and secondary weights stay distributed enough to preserve rebalance flexibility.

AUM History: Strong Recovery After Q1 Dip

After dropping to $162.99B in 2025Q1, AUM rebounded to $184.05B in 2025Q2, then advanced to $196.53B in 2025Q3 and $198.97B in 2025Q4. That sequence points to sustained participation in market strength rather than a one-quarter spike.

Analyst Read-Through

This filing looks like a high-scale growth allocator that accepts concentration in proven leaders while keeping guardrails in place. If 2026 broadens beyond current mega-cap leadership, this structure should still adapt because the portfolio is not trapped in a narrow top-two profile.

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Q&A

How large is American Century’s Q4 2025 13F portfolio?

The canonical reported 13F AUM is $198.97B.

What is the largest disclosed position?

NVIDIA (NVDA) is the largest at $11.81B, representing 7.28% of the holdings value base.

Is the portfolio highly concentrated?

It has meaningful concentration but not extreme levels: top-5 is 23.6% and top-10 is 33.4%.

How did AUM move during 2025?

AUM rose from $162.99B in Q1 to $198.97B by Q4, with steady gains in Q2 and Q3.

Why does this filing matter for tracking institutional behavior?

It shows how a large manager can run a winner-led portfolio while maintaining enough diversification to manage downside and regime shifts.

Marcus ChenSenior Market Analyst

Senior Market Analyst at 13F Insight. Covers institutional portfolio strategy, 13F filings, and smart money trends.