Form 13-F position report

REGENERON PHARMACEUTICALS

Reported by SOUTHEASTERN ASSET MANAGEMENT INC TN

Company profile Manager portfolio Source filing
REGN CUSIP 75886F107 Manager CIK 0000807985
Latest reported change

Reported 144,607 shares, down 15,974 (9.9%) from the prior quarter.

Reported value -3.6%; share count -9.9% vs. the prior quarter.

Reduced
% of reported 13F value 4.15% This manager · Q3 2025
Shares 144,607 Quarter-end amount reported
Reported value $81,308,178 Fair value at quarter end
Consecutive quarters held 3 Through Q3 2025

Reported position value by quarter

Reported position value by quarter

Each bar is a Form 13-F quarter-end snapshot. It does not show trades made within the quarter.

Manager history

Quarterly position history

How this manager's reported quarter-end position changed over time.

6 quarters
Quarter Activity Shares Change % of reported 13F Reported value Filed
Q2 2026 Added 152,322 +21,660 (16.6%) 4.95% $94,978,860 2026-08-14
Q1 2026 Reduced 130,662 -35,130 (-21.2%) 4.97% $100,954,687 2026-05-15
Q4 2025 Added 165,792 +21,185 (14.7%) 5.7% $127,969,871 2026-02-13
Q3 2025 Reduced 144,607 -15,974 (-9.9%) 4.15% $81,308,178 2025-11-14
Q2 2025 Added 160,581 +45,701 (39.8%) 4.25% $84,305,025 2025-08-14
Q1 2025 New 114,880 +114,880 (0.0%) 3.88% $72,860,344 2025-05-15
Institutional context

Who else reported the position

1358 managers reported REGENERON PHARMACEUTICALS for Q3 2025.

Manager Activity Shares Change % of reported 13F Reported value Tenure
VANGUARD GROUP INC Reduced 9,048,269 -375,779 0.08% $5,087,570,211 50 qtrs
BlackRock Inc Reduced 8,837,174 -438,911 0.09% $4,968,878,140 5 qtrs
STATE STREET CORPORATION Reduced 4,691,223 -140,779 0.09% $2,637,733,956 50 qtrs
Dodge & Cox Added 4,550,845 +724,562 1.38% $2,558,803,618 16 qtrs
JPMorgan Chase & Co Added 4,072,326 +132,708 0.14% $2,289,760,415 50 qtrs
GEODE CAPITAL MANAGEMENT LLC Added 2,535,898 +70,844 0.09% $1,419,627,369 50 qtrs
FRANKLIN RESOURCES INC Added 2,453,143 +139,647 0.34% $1,379,328,713 50 qtrs
Capital World Investors Added 1,998,366 +32,348 0.15% $1,123,608,855 50 qtrs
LOOMIS SAYLES & CO L P Added 1,979,453 +38,383 1.32% $1,112,987,056 37 qtrs
FMR LLC Reduced 1,935,835 -1,391,216 0.06% $1,088,462,214 50 qtrs
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Filing details and methodology As reported
Report period
September 30, 2025
Filed
November 14, 2025
Filing type
13F-HR
Position type
COM

Voting authority reported

Sole
144,607
Shared
0
None
0

“None” means the manager reported no voting authority for those shares on non-routine matters. It does not disclose why and is not evidence of securities lending.

Form 13-F is a delayed quarter-end snapshot of disclosed long Section 13(f) securities. It can be filed up to 45 days after quarter end, excludes short positions and most non-U.S. securities, and does not reveal intra-quarter trading. For options, reported shares and value describe the underlying-share exposure; strike, expiry, premium, and written positions are not disclosed.