Southeastern Asset Management (Longleaf)
SuperinvestorSoutheastern Asset Management Inc
- SEC CIK
- 0000807985
- Manager
- Mason Hawkins
- Style
- Value
- Latest filing
- Aug 14, 2026
REGN holding history
Regeneron Pharmaceuticals, Inc. in every 13F filed by Southeastern Asset Management (Longleaf), including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
REGN overviewAll 13F holders of REGNFull Q2 2026 holdings
- Shares (Q2 2026)
- 152,322
- Value
- $95.0M
- % of portfolio
- 5.0%
- Quarters held
- 6
- Since Q1 2025
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q2 2026 | 152,322 | $95.0M | 5.0% | +21,660+16.6% | Added | Holders |
| Q1 2026 | 130,662 | $101.0M | 5.0% | −35,130−21.2% | Reduced | Holders |
| Q4 2025 | 165,792 | $128.0M | 5.7% | +21,185+14.7% | Added | Holders |
| Q3 2025 | 144,607 | $81.3M | 4.2% | −15,974−9.9% | Reduced | Holders |
| Q2 2025 | 160,581 | $84.3M | 4.3% | +45,701+39.8% | Added | Holders |
| Q1 2025 | 114,880 | $72.9M | 3.9% | +114,880 | New | Holders |