---
title: Millennium Rolled $16.6B of QQQ Exposure in One Quarter as Walmart Jumped Into the Top Bucket
type: research
slug: millennium-q4-2025-13f-qqq-turnover-ivv-surge-walmart-build
canonical_url: https://13finsight.com/research/millennium-q4-2025-13f-qqq-turnover-ivv-surge-walmart-build
published_at: 2026-02-19T10:13:56.859Z
updated_at: 2026-02-19T13:35:02.906Z
author: Marcus Chen
author_title: Senior Market Analyst
author_url: https://13finsight.com/authors/marcus-chen
word_count: 393
locale: en
source: 13F Insight
---

# Millennium Rolled $16.6B of QQQ Exposure in One Quarter as Walmart Jumped Into the Top Bucket

> Millennium's Q4 2025 13F reveals a $16.6B QQQ sleeve rollover, a $4.23B build in Walmart, and a portfolio that grew to $237.8B while top-10 concentration moved higher.

Millennium Management ended Q4 2025 with a $237.8B 13F portfolio. The headline is not only size growth; it is implementation rotation: one large QQQ line disappeared while another large QQQ line appeared, alongside a major Walmart build. TL;DR Total value rose from $234.3B to $237.8B (+1.49% QoQ), while unique holdings increased from 4,236 to 4,328. QQQ showed a two-line rollover: a -$8.64B sold line and a +$7.97B new line, rather than a simple one-way add/cut. WMT (+$4.23B) and IVV (+$4.91B) were key upward reallocations; MSFT and NVDA were materially trimmed. Top-10 concentration increased to 26.85%, suggesting tighter capital concentration despite broader name count. Q4 Filing Snapshot: Bigger Book, More Names, But Tighter Top Bucket On the surface, Q4 looks incremental: +$3.50B and +92 unique holdings. Underneath, the top-bucket behavior is more important for risk interpretation: top-10 weight rose even as the opportunity set widened. Concentration Shift: Why Top-10 Rising Matters More Than Top-1 Top-1 moved only +0.12pp, but top-10 moved +0.95pp. That pattern usually means the manager is not making one giant idiosyncratic bet, but consolidating risk into a broader set of large liquid sleeves. Where Size Sits Now The Q4 top cluster remains index and mega-cap heavy: IWM, IVV, NVDA, QQQ, AAPL, and WMT. This remains consistent with Millennium's pod-based, high-liquidity implementation style rather than concentrated activist ownership. Rebalance Ledger: QQQ Sleeve Rotation Plus Defensive Beta Repricing Combining Q3/Q4 reconstructed line items, the most informative read is a sleeve reconfiguration: QQQ line rollover, stronger IVV/SPY, and a large single-name step-up in WMT. Trims in MSFT and NVDA point to valuation/risk balancing, not a wholesale AI exit. Did Millennium actually cut Nasdaq risk in Q4 2025? Not in a simplistic yes/no sense. The filing shows a large QQQ line exited and another large QQQ line entered. The more accurate conclusion is that Millennium restructured implementation and strike/sleeve composition while keeping material Nasdaq-linked exposure. What did Millennium buy in Q4 2025? The largest value increases were QQQ (new line), IVV, WMT, and SPY. This combination points to a blend of index beta management and targeted stock conviction rather than a pure factor-neutral rebalance. Analyst View Given industry reporting around late-2025 index-rebalance volatility, this Q4 profile looks like a risk-engineering quarter: preserve gross opportunity, refresh implementation, and concentrate the deployable top bucket. For cross-manager contrast, compare with Citadel's Q4 rebalance and D.E. Shaw's de-crowding profile.

---

Source: 13F Insight — https://13finsight.com/research/millennium-q4-2025-13f-qqq-turnover-ivv-surge-walmart-build
Author: Marcus Chen — https://13finsight.com/authors/marcus-chen
Last updated: 2026-02-19T13:35:02.906Z