SOUND SHORE MANAGEMENT INC /CT/ — REGENERON PHARMACEUTICALS, INC. REGN: Quarterly 13F Position History
SOUND SHORE MANAGEMENT INC /CT/ has reported REGENERON PHARMACEUTICALS, INC. (REGN) on 3 13F-HR filings in Pactolio's tracked window, first appearing in Q3 2025. As of Q1 2026, the position is sized at 150,960 shares ($116.6M market value, 3.91% of the equity book). Quarter-over-quarter share count change: 24,927 (-14.2%) .
- 150,960Shares Held (Latest Filing)
- $116.6MReported Market Value (Latest Filing)
- 3.91%Portfolio Weight (% of 13F Equity Book)
- 24,927Quarter-over-Quarter Share Change
- -$19.1MQuarter-over-Quarter Value Change
- 175,887Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 3 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 150,960 | 24,927 | -14.2% | $116.6M | 3.91% | $772.64 |
| Q4 2025 | 175,887 | +60,859 | +52.9% | $135.8M | 4.32% | $771.87 |
| Q3 2025 | 115,028 | — | — | $64.7M | 2.14% | $562.27 |
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, not the manager's cost basis. See the full methodology document for the normalization rules.
When did SOUND SHORE MANAGEMENT INC /CT/ first disclose a REGN position in 13F-HR filings?
SOUND SHORE MANAGEMENT INC /CT/ first reported REGENERON PHARMACEUTICALS, INC. (REGN) on its 13F-HR filing for the period ending 2025-09-30 (Q3 2025). The position has appeared on 3 reported quarters within Pactolio's tracked window.
What was SOUND SHORE MANAGEMENT INC /CT/'s most recent quarter-over-quarter share-count change in REGN?
Between Q4 2025 and Q1 2026, SOUND SHORE MANAGEMENT INC /CT/ reduced its REGN position by 24,927 shares (-14.2%), leaving 150,960 shares at a market value of $116.6M.
Does the implied price-per-share represent SOUND SHORE MANAGEMENT INC /CT/'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.