---
title: "Citadel's $666B Q4 2025 Rebalance: Cutting Index Hedges, Adding Alphabet and Semis"
type: research
slug: citadel-advisors-q4-2025-13f-rebalance-alphabet-semis-index-hedges
canonical_url: https://13finsight.com/research/citadel-advisors-q4-2025-13f-rebalance-alphabet-semis-index-hedges
published_at: 2026-02-19T08:43:22.849Z
updated_at: 2026-02-19T08:43:22.849Z
author: Marcus Chen
author_title: Senior Market Analyst
author_url: https://13finsight.com/authors/marcus-chen
word_count: 526
locale: en
source: 13F Insight
---

# Citadel's $666B Q4 2025 Rebalance: Cutting Index Hedges, Adding Alphabet and Semis

> Citadel Advisors ended Q4 2025 with a $665.9B 13F portfolio, up 1.33% QoQ, while reducing top-position concentration. The filing shows a clear rebalance: heavier Alphabet and semiconductor exposure, paired with lower SPY/QQQ index hedge weight.

Citadel Advisors' Q4 2025 13F shows a portfolio that got larger but less top-heavy. Total reported value rose to $665.9B (+1.33% QoQ), while top-position concentration declined across Top 1, Top 2, Top 5, and Top 10 buckets. The key move was not an all-in risk-on bet, but a deliberate rebalance: adding to selected AI and semiconductor names while trimming broad index hedge exposure. TL;DR Q4 2025 13F value rose from $657.1B to $665.9B (+1.33% QoQ). Concentration fell: Top 1 weight dropped from 7.08% to 5.93%; Top 10 fell from 34.73% to 33.00%. Largest issuer-level net adds: Alphabet (+$6.63B), Micron (+$3.22B), Amazon (+$3.13B), Broadcom (+$2.50B). Largest issuer-level net cuts: SPY (-$7.03B), QQQ (-$6.97B), MicroStrategy (-$5.66B). Q4 Filing Snapshot: Bigger Book, Similar Breadth Citadel Advisors filed Q4 2025 holdings on 2026-02-17 (report date 2025-12-31). Portfolio value increased by $8.72B QoQ, and consolidated unique holdings rose from 6,446 to 6,510 (+0.99%). That combination matters: the portfolio grew, but not through a narrow concentration spike. Instead, the book expanded while redistributing weight away from the very top positions. Concentration De-Risking: Top Weights Came Down Every major concentration bucket moved lower in Q4. Top 1 weight fell -1.15pp (7.08% to 5.93%), and Top 2 fell -2.28pp (13.66% to 11.38%). This is consistent with a manager reducing single-point portfolio dependency while still maintaining very large gross exposure. Where Gross Exposure Still Sits Even after the concentration step-down, the largest Q4 exposures remained in index and mega-cap complex names: SPY, QQQ, TSLA, NVDA, AAPL, and META. Notably, all top-10 consolidated lines show optionType=Put in the current filing view, reinforcing that 13F top-line value is about reported long positions, not full net exposure. Rebalance Ledger: Add to AI Complex, Trim Broad Index Hedges At issuer level, Q4's biggest net add was Alphabet (+$6.63B combined across share classes), followed by Micron, Amazon, Tesla, and Broadcom. On the trim side, Citadel reduced SPY and QQQ by roughly $14.0B combined, alongside cuts in MSTR, COIN, and MSFT. Did Citadel cut index exposure in Q4 2025? Yes, in aggregate. SPY fell by $7.03B and QQQ by $6.97B, with additional reduction in IWM (-$1.40B). At the same time, the filing shows selective additions in other macro sleeves such as TLT (+$1.11B), HYG (+$1.08B), SLV (+$2.29B), and DIA (+$2.28B). What did Citadel buy in Q4 2025? Among notable new lines, ISRG appeared as a fresh position (~$1.16B), and TGT as another new allocation (~$1.09B). Overall turnover stayed very high: 1,372 new positions, 1,308 sold, and 7,809 total changed lines between the two latest filings. Analyst Take Q4 reads as a multi-strategy rebalance, not a one-direction macro bet: less concentration at the top, smaller broad-index hedge stack, and larger issuer-specific exposure in AI and semiconductor-linked names. For readers tracking filing-season cross-manager context, compare this setup with Whale Fund Filings Decoded and the Q4 Institutional Consensus Report. Methodology Primary data source: /api/v1/filers/0001423053/holdings for 2025Q3 and 2025Q4 in consolidated view (full pagination). Issuer-level net rebalance computed as Q4 value minus Q3 value after aggregating consolidated rows by normalized issuer_name. Trade-intent cross-check from /api/v1/filers/0001423053/changes (new/sold/increased/decreased and share deltas). 13F caveat: reported long positions and option line items do not represent full net portfolio risk.

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Source: 13F Insight — https://13finsight.com/research/citadel-advisors-q4-2025-13f-rebalance-alphabet-semis-index-hedges
Author: Marcus Chen — https://13finsight.com/authors/marcus-chen
Last updated: 2026-02-19T08:43:22.849Z