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.

American Century Q4 2025 13F: $198.97B and NVDA-Led Allocation

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.

AMERICAN CENTURY COMPANIES INC Top Holdings — 2025Q4 ($B)

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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.

AMERICAN CENTURY COMPANIES INC AUM History

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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.

Related 13F Insight Research

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.