Magnetar Financial LLC REGN — * REGENERON PHARMACEUTICALS

Ownership history in Magnetar Financial LLC  ·  24 quarters on record

AI Ownership Summary

Magnetar Financial LLC reported * REGENERON PHARMACEUTICALS (REGN) in 24 quarterly 13F filings from 2024 Q1 through 2025 Q3. Peak portfolio weight reached 1.77% in 2024 Q4. The latest visible filing shows REGN at 0.00% 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 REGN ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Magnetar Financial LLC's position in * REGENERON PHARMACEUTICALS, 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 Q3

REGN was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.77% 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 Q1 to 2025 Q3

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.

REGN stock page Magnetar Financial LLC fund profile Magnetar Financial LLC full holdings
How Magnetar Financial LLC held REGN — position size vs. price
% of Fund (quarterly)    REGN 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 Q3 ADDED — — — 1,307 +837 +178.1% 0.00% $735K 2025-11-13 $693.29
2025 Q2 REDUCED 95.9% +7.0% ❌ 470 -11,072 -95.9% 0.00% $247K 2025-08-12 $554.34
2025 Q1 REDUCED 89.3% -17.1% ✅ 11,542 -96,608 -89.3% 0.10% $7.3M 2025-05-15 $581.81
2024 Q4 ADDED — — — 108,150 +101,150 +1445.0% 1.77% $77.0M 2025-02-11 $660.99
2024 Q3 REDUCED 79.0% -33.2% ✅ 7,000 -26,257 -79.0% 0.16% $7.4M 2024-11-13 $798.93
2024 Q1 REDUCED 51.3% +9.8% ❌ 33,257 -35,063 -51.3% 0.72% $32.0M 2024-05-15 $971.65
18 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding REGN

As of 2026 Q1 — sorted by position size

Bronte Capital Management Pty Ltd. 3Y 7Y 13.22% JIA INVESTMENT ALLIANCE PTE. LTD. 3Y 5.44% Bronte Capital Management Pty Ltd. 3Y 7Y 5.24% Bellecapital International Ltd. 3Y 7Y 3.51% Peak Wealth Management LLC 3.3% Sivik Global Healthcare LLC 3Y 7Y 2.35% NORTH POINT PORTFOLIO MANAGERS CORP/OH 3Y 7Y 2.3% ATWOOD & PALMER INC 3Y 7Y 1.82% ARS Investment Partners, LLC 3Y 7Y 1.82% Washington Trust Advisors, Inc. 3Y 1.8%

FAQ About Magnetar Financial LLC and REGN

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

How long has Magnetar Financial LLC reported owning REGN?

Magnetar Financial LLC reported REGN across 6 quarterly 13F filings, from 2024 Q1 through 2025 Q3.

What was the largest reported REGN position in Magnetar Financial LLC's portfolio?

The largest reported portfolio weight for REGN was 1.77% in 2024 Q4.

What is the latest reported REGN position on this page?

The most recent filing on this page is 2025 Q3, when Magnetar Financial LLC reported 1,307 shares, equal to 0.00% of portfolio, with an estimated market value of $735K.

What does the chart on this REGN ownership page compare?

The chart compares Magnetar Financial LLC's quarterly REGN 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 Magnetar Financial LLC time their REGN position?

Based on 13F filing dates vs. subsequent REGN price moves, Magnetar Financial LLC correctly timed 11 out of 23 reported position changes (48%). The annualised alpha on REGN relative to SPY over the holding period was -17.2%.

← Back to Magnetar Financial LLC Holdings