S&CO INC RPRX — ROYALTY PHARMA PLC CL A

Ownership history in S&CO INC  ·  22 quarters on record

AI Ownership Summary

S&CO INC reported ROYALTY PHARMA PLC CL A (RPRX) in 22 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 1.07% in 2026 Q1. The latest visible filing shows RPRX at 1.07% 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. Older history is available after unlock; the visible window still shows the most recent pattern.

What this RPRX 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 ROYALTY PHARMA PLC CL A, 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
2026 Q1

RPRX was reported at 1.07% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.07% in 2026 Q1

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

Time in book
Holding Window
2023 Q4 to 2026 Q1

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.

RPRX stock page S&CO INC fund profile S&CO INC full holdings
How S&CO INC held RPRX — position size vs. price
% of Fund (quarterly)    RPRX price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 UNCHANGED — — — 358,377 — 0% 1.07% $17K 2026-05-07 $50.20
2025 Q4 ADDED — — — 358,377 +140 +0.0% 0.86% $13.8M 2026-02-05 $43.87
2025 Q3 ADDED — — — 358,237 +70 +0.0% 0.77% $12.6M 2025-11-06 $40.34
2025 Q2 UNCHANGED — — — 358,167 — 0% 0.83% $12.9M 2025-08-07 $36.39
2025 Q1 ADDED — — — 358,167 +5 +0.0% 0.75% $11.1M 2025-05-08 $32.33
2024 Q4 REDUCED — — — 358,162 -4,323 -1.2% 0.62% $9.1M 2025-02-07 $30.79
2024 Q3 ADDED — — — 362,485 +4,220 +1.2% 0.67% $10.3M 2024-11-07 $25.52
2024 Q2 ADDED — — — 358,265 +17,210 +5.0% 0.66% $9.4M 2024-08-08 $24.97
2024 Q1 ADDED — — — 341,055 +8,945 +2.7% 0.73% $10.4M 2024-05-09 $26.51
2023 Q4 ADDED — — — 332,110 +78,500 +31.0% 0.72% $9.3M 2024-02-12 $27.34
12 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding RPRX

As of 2026 Q1 — sorted by position size

CM Management, LLC 3Y 5.01% TORRAY INVESTMENT PARTNERS LLC 3Y 7Y 4.54% COOPER INVESTORS PTY LTD 4.14% HOMESTEAD ADVISERS CORP 3Y 7Y 2.12% KIRR MARBACH & CO LLC /IN/ 3Y 7Y 2.08% Goodman Advisory Group, LLC 3Y 2.07% Kearns & Associates LLC 3Y 1.5% Aurora Investment Counsel 3Y 7Y 0.94% Hosking Partners LLP 3Y 7Y 0.86% Marathon Asset Management Ltd 3Y 0.81%

FAQ About S&CO INC and RPRX

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 RPRX?

S&CO INC reported RPRX across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

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

The largest reported portfolio weight for RPRX was 1.07% in 2026 Q1.

What is the latest reported RPRX position on this page?

The most recent filing on this page is 2026 Q1, when S&CO INC reported 358,377 shares, equal to 1.07% of portfolio, with an estimated market value of $17K.

What does the chart on this RPRX ownership page compare?

The chart compares S&CO INC's quarterly RPRX 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 RPRX position?

Based on 13F filing dates vs. subsequent RPRX price moves, S&CO INC correctly timed 10 out of 18 reported position changes (56%). The annualised alpha on RPRX relative to SPY over the holding period was -10.4%.

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