Repligen (RGEN) Options Chain

NASDAQ: RGENHealth CareBiotechnology: Biological Products (No Diagnostic Substances)USD

163.84-3.38 (-2.02%)

At close: Oct 8, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 7
Share price: $163.84
Put/call ratio (OI): 0.87
Put/call ratio (volume): 14.44
ATM implied volatility: 53.1%
Expected move: ±$12.04
Open interest (C / P): 2.78K / 2.41K

RGEN options summary

The RGEN options chain for the October 16, 2026 expiration lists 21 call and 14 put contracts, with 7 days until expiration. Open interest stands at 2,779 calls and 2,406 puts, a put/call ratio of 0.87, which is fairly balanced between calls and puts. At-the-money implied volatility near the $165.00 strike is 53.1%, which implies the market expects a move of about ±$12.04 (7.4%) in Repligen stock by expiration.

The most open interest sits at the $200.00 call (2.28K contracts) and the $110.00 put (600 contracts).

Summary generated from market data by MetaCap's automated system. Methodology

RGEN options chain · October 16, 2026

RGEN calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
—	—	—	—	—	—	110.00	0.00	2.15	0.50	180.9%	—	600
0	2	—	63.72	0.00	0.00	115.00	—	—	—	—	—	—
0	1	—	62.55	0.00	0.00	120.00	—	—	—	—	—	—
1	—	79.3%	49.53	37.10	40.70	125.00	—	—	—	—	—	—
3	3	68.8%	58.80	32.10	35.70	130.00	—	—	—	—	—	—
—	—	—	—	—	—	140.00	0.00	2.40	0.07	90.5%	401	402
2	—	59.4%	30.80	17.60	21.10	145.00	—	—	—	—	—	—
4	1	54.1%	31.90	13.10	16.30	150.00	—	—	—	—	—	—
1	1	50.9%	24.40	8.80	12.10	155.00	0.70	3.60	0.80	58.1%	24	19
7	3	56.1%	4.55	6.00	7.50	160.00	2.50	5.20	2.60	58.1%	11	13
RGEN $163.84
31	4	52.6%	3.62	2.80	6.30	165.00	4.40	7.20	8.50	53.6%	3	312
12	3	56.8%	2.45	1.30	4.80	170.00	7.40	10.60	10.40	54.5%	5	438
12	6	57.7%	4.35	0.05	3.60	175.00	11.20	14.20	7.30	53.8%	446	452
20	1	61.1%	1.20	0.00	1.20	180.00	15.40	18.20	21.40	50.5%	1	53
20	1	72.0%	1.10	0.00	2.35	185.00	20.10	23.40	12.90	59.5%	1	108
220	1	58.6%	1.60	0.00	0.55	190.00	25.00	27.40	11.36	83.8%	—	5
45	1	79.6%	2.50	0.00	1.30	195.00	30.00	33.00	14.62	69.4%	—	2
2,284	26	65.2%	0.10	0.05	0.20	200.00	35.30	38.10	15.80	84.8%	1	1
30	1	87.3%	0.50	0.00	0.50	210.00	—	—	—	—	—	—
55	2	132.3%	0.40	0.00	2.15	220.00	54.80	58.10	54.80	102.8%	1	1
10	1	146.9%	0.60	0.00	2.15	230.00	64.60	67.60	64.83	156.9%	1	0
16	1	160.6%	0.83	0.00	2.15	240.00	—	—	—	—	—	—
6	3	173.4%	1.05	0.00	2.15	250.00	—	—	—	—	—	—

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 October 16, 2026 expiration, the RGEN put/call ratio based on open interest is 0.87 (2,406 puts vs 2,779 calls), and 14.44 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 October 16, 2026 is about 53.1%, an annualized estimate of how much the market expects Repligen stock to move.

How many RGEN option expiration dates are there?

RGEN has 7 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.