Repligen (RGEN) Options Chain
NASDAQ: RGENHealth CareBiotechnology: Biological Products (No Diagnostic Substances)USD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Pre-market: 174.48 +0.35%
Expiration date
- Expiration
- Dec 18, 2026
- Days to expiration
- 67
- Share price
- $173.88
- Put/call ratio (OI)
- 2.46
- Put/call ratio (volume)
- 3.19
- Expected move
- ±$0.2905
- Open interest (C / P)
- 63 / 155
RGEN options summary
The RGEN options chain for the December 18, 2026 expiration lists 28 call and 23 put contracts, with 67 days until expiration. Open interest stands at 63 calls and 155 puts, a put/call ratio of 2.46, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $175.00 strike is 0.4%, which implies the market expects a move of about ±$0.2905 (0.2%) in Repligen stock by expiration.
The most open interest sits at the $180.00 call (41 contracts) and the $185.00 put (150 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
RGEN options chain · December 18, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 59.30 | 100.80 | 104.90 | 80.00 | 0.00 | 2.15 | 1.40 | |||||
| 70.00 | 81.70 | 85.70 | 85.00 | 0.00 | 2.20 | 2.00 | |||||
| 55.10 | 76.80 | 80.80 | 90.00 | 0.00 | 2.20 | 1.60 | |||||
| 60.90 | 72.00 | 75.90 | 95.00 | 0.00 | 0.00 | 0.80 | |||||
| — | — | — | 105.00 | 0.00 | 0.00 | 1.28 | |||||
| — | — | — | 110.00 | 0.00 | 0.00 | 0.95 | |||||
| — | — | — | 115.00 | 0.00 | 0.00 | 2.70 | |||||
| 49.00 | 0.00 | 0.00 | 120.00 | 0.00 | 0.00 | 1.70 | |||||
| — | — | — | 125.00 | 0.00 | 0.00 | 2.15 | |||||
| 46.00 | 0.00 | 0.00 | 130.00 | 0.00 | 0.00 | 5.78 | |||||
| 41.90 | 0.00 | 0.00 | 135.00 | — | — | — | |||||
| 51.80 | 0.00 | 0.00 | 140.00 | 0.00 | 0.00 | 8.48 | |||||
| 43.29 | 0.00 | 0.00 | 145.00 | 0.00 | 0.00 | 3.90 | |||||
| 37.14 | 0.00 | 0.00 | 150.00 | 0.00 | 0.00 | 5.30 | |||||
| 31.00 | 0.00 | 0.00 | 155.00 | 0.00 | 0.00 | 4.90 | |||||
| 24.00 | 0.00 | 0.00 | 160.00 | 0.00 | 0.00 | 7.80 | |||||
| 34.60 | 0.00 | 0.00 | 165.00 | 0.00 | 0.00 | 13.70 | |||||
| 18.00 | 0.00 | 0.00 | 170.00 | 0.00 | 0.00 | 13.15 | |||||
| 9.60 | 0.00 | 0.00 | 175.00 | 0.00 | 0.00 | 9.63 | |||||
| 11.50 | 0.00 | 0.00 | 180.00 | 0.00 | 0.00 | 15.29 | |||||
| 18.40 | 0.00 | 0.00 | 185.00 | 0.00 | 0.00 | 13.02 | |||||
| 9.82 | 0.00 | 0.00 | 190.00 | 0.00 | 0.00 | 20.03 | |||||
| 14.70 | 0.00 | 0.00 | 195.00 | 0.00 | 0.00 | 21.90 | |||||
| 4.50 | 0.00 | 0.00 | 200.00 | — | — | — | |||||
| 10.80 | 0.00 | 0.00 | 210.00 | — | — | — | |||||
| 9.52 | 0.00 | 0.00 | 220.00 | — | — | — | |||||
| 6.13 | 0.00 | 0.00 | 230.00 | — | — | — | |||||
| 4.60 | 0.00 | 0.00 | 240.00 | — | — | — | |||||
| 2.30 | 0.00 | 0.00 | 250.00 | — | — | — | |||||
| 2.89 | 0.00 | 0.00 | 260.00 | — | — | — | |||||
| 1.20 | 0.00 | 0.00 | 270.00 | 0.00 | 0.00 | 85.30 | |||||
| 0.92 | 0.00 | 0.00 | 280.00 | — | — | — | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the RGEN put/call ratio?
For the December 18, 2026 expiration, the RGEN put/call ratio based on open interest is 2.46 (155 puts vs 63 calls), and 3.19 based on today's volume. A ratio above 1 means more puts than calls.
What is RGEN's implied volatility?
At-the-money implied volatility for RGEN options expiring December 18, 2026 is about 0.4%, an annualized estimate of how much the market expects Repligen stock to move.
How many RGEN option expiration dates are there?
RGEN has 9 listed expiration dates, from Oct 16, 2026 to Dec 17, 2027.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.