SOUTHEASTERN ASSET MANAGEMENT INC/TN/: REGENERON PHARMACEUTICALS (REGN): Quarterly 13F Position History
As of Q2 2026, SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported 152,322 shares of REGENERON PHARMACEUTICALS (REGN), worth $95.0M and representing 5.0% of its 13F equity book. Quarter-over-quarter share count change: + 21,660 (+16.6%) . The position first appeared in Q1 2025 and has been disclosed across 6 13F-HR filings in Pactolio's tracked window.
- 152,322Shares Held (Latest Filing)
- $95.0MReported Market Value (Latest Filing)
- 5.0%Portfolio Weight (% of 13F Equity Book)
- +21,660Quarter-over-Quarter Share Change
- -$6.0MQuarter-over-Quarter Value Change
- 165,792Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 6 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 152,322 | +21,660 | +16.6% | $95.0M | 5.0% | $623.5 |
| Q1 2026 | 130,662 | 35,130 | -21.2% | $101.0M | 5.0% | $772.6 |
| Q4 2025 | 165,792 | +21,185 | +14.7% | $128.0M | 5.7% | $771.9 |
| Q3 2025 | 144,607 | 15,974 | -9.9% | $81.3M | 4.2% | $562.3 |
| Q2 2025 | 160,581 | +45,701 | +39.8% | $84.3M | 4.3% | $525.0 |
| Q1 2025 | 114,880 | – | – | $72.9M | 3.9% | $634.2 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares, a quarter-end mark rather than the manager's cost basis. See the full methodology document for the normalization rules.
When did SOUTHEASTERN ASSET MANAGEMENT INC/TN/ first disclose a REGN position in 13F-HR filings?
SOUTHEASTERN ASSET MANAGEMENT INC/TN/ first reported REGENERON PHARMACEUTICALS (REGN) on its 13F-HR filing for the period ending 2025-03-31 (Q1 2025). The position has appeared on 6 reported quarters within Pactolio's tracked window.
What was SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s most recent quarter-over-quarter share-count change in REGN?
Between Q1 2026 and Q2 2026, SOUTHEASTERN ASSET MANAGEMENT INC/TN/ added 21,660 shares of REGN (+16.6%), bringing the total reported position to 152,322 shares at a market value of $95.0M.
Does the implied price-per-share represent SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s cost basis in REGN?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.