S&CO INC SIRI — SIRIUS XM HOLDINGS INC.

Ownership history in S&CO INC  ·  6 quarters on record

AI Ownership Summary

S&CO INC reported SIRIUS XM HOLDINGS INC. (SIRI) in 6 quarterly 13F filings from 2024 Q3 through 2025 Q4. Peak portfolio weight reached 1.21% in 2024 Q4. The latest visible filing shows SIRI at 0.87% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this SIRI ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was S&CO INC's position in SIRIUS XM HOLDINGS INC., and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

SIRI was reported at 0.87% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.21% in 2024 Q4

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q3 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

SIRI stock page S&CO INC fund profile S&CO INC full holdings
How S&CO INC held SIRI — position size vs. price
% of Fund (quarterly)    SIRI price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED — — — 701,442 -10,027 -1.4% 0.87% $14.0M 2026-02-14 (Est.) $21.29
2025 Q3 REDUCED — — — 711,469 -6,548 -0.9% 1.01% $16.6M 2025-11-06 $21.36
2025 Q2 REDUCED 6.3% +0.1% ❌ 718,017 -48,356 -6.3% 1.06% $16.5M 2025-08-07 $20.52
2025 Q1 REDUCED — — — 766,373 -13,897 -1.8% 1.16% $17.3M 2025-05-08 $20.65
2024 Q4 ADDED — — — 780,270 +1,215 +0.2% 1.21% $17.8M 2025-02-07 $24.19
2024 Q3 INITIATED — — — 779,055 — — 1.20% $18.4M 2024-11-07 $24.58

🏢 Other funds also holding SIRI

As of 2026 Q1 — sorted by position size

swisspartners Advisors Ltd 3Y 6.05% TOWERVIEW LLC 3Y 7Y 4.99% Hi-Line Capital Management, LLC 3Y 4.84% CAPITAL MANAGEMENT CORP /VA 3Y 7Y 2.09% CHECK CAPITAL MANAGEMENT INC/CA 3Y 7Y 1.98% Helium Advisors LLC 1.47% R.H. Dinel Investment Counsel, Inc. 3Y 7Y 0.83% Inlight Wealth Management, LLC 0.71% Everstar Asset Management, LLC 0.53% Watershed Asset Management, L.L.C. 3Y 7Y 0.45%

FAQ About S&CO INC and SIRI

These are the practical questions this page is built to answer before you even open the full history table.

How long has S&CO INC reported owning SIRI?

S&CO INC reported SIRI across 6 quarterly 13F filings, from 2024 Q3 through 2025 Q4.

What was the largest reported SIRI position in S&CO INC's portfolio?

The largest reported portfolio weight for SIRI was 1.21% in 2024 Q4.

What is the latest reported SIRI position on this page?

The most recent filing on this page is 2025 Q4, when S&CO INC reported 701,442 shares, equal to 0.87% of portfolio, with an estimated market value of $14.0M.

What does the chart on this SIRI ownership page compare?

The chart compares S&CO INC's quarterly SIRI portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did S&CO INC time their SIRI position?

Based on 13F filing dates vs. subsequent SIRI price moves, S&CO INC correctly timed 2 out of 5 reported position changes (40%). The annualised alpha on SIRI relative to SPY over the holding period was -20.6%.

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