Rhythm Pharmaceuticals (RYTM) Options Chain

NASDAQ: RYTMHealth CareBiotechnology: Pharmaceutical PreparationsUSD

90.78+1.14 (+1.27%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Dec 18, 2026
Days to expiration: 68
Share price: $90.78
Put/call ratio (OI): 0.58
Put/call ratio (volume): 0.35
ATM implied volatility: 0.8%
Expected move: ±$0.3056
Open interest (C / P): 356 / 207

RYTM options summary

The RYTM options chain for the December 18, 2026 expiration lists 27 call and 14 put contracts, with 68 days until expiration. Open interest stands at 356 calls and 207 puts, a put/call ratio of 0.58, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $90.00 strike is 0.8%, which implies the market expects a move of about ±$0.3056 (0.3%) in Rhythm Pharmaceuticals stock by expiration.

The most open interest sits at the $150.00 call (143 contracts) and the $95.00 put (151 contracts).

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

RYTM options chain · December 18, 2026

RYTM 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
0	4	—	47.40	0.00	0.00	45.00	0.00	0.00	1.10	25.0%	1	0
0	2	—	40.69	0.00	0.00	50.00	0.00	2.50	1.10	102.8%	1	5
0	2	95.8%	36.34	33.50	37.40	55.00	0.00	2.80	1.65	91.9%	1	7
0	1	—	54.28	0.00	0.00	60.00	0.00	2.45	0.85	76.2%	1	11
—	—	—	—	—	—	65.00	0.00	2.60	1.20	65.7%	1	4
0	50	—	26.60	0.00	0.00	70.00	0.00	2.85	1.80	56.1%	1	3
3	2	214.7%	42.70	36.20	40.30	75.00	0.50	3.30	2.50	50.3%	1	4
0	1	96.4%	20.30	18.40	22.00	80.00	2.50	6.40	6.51	59.7%	4	5
6	4	58.6%	25.06	7.80	12.10	85.00	1.40	5.90	3.58	55.8%	5	8
0	12	—	31.15	0.00	0.00	90.00	0.00	0.00	23.70	0.8%	1	0
RYTM $90.78
5	1	58.9%	6.25	3.20	7.50	95.00	8.00	10.30	8.70	49.9%	10	151
50	1	145.3%	21.80	17.20	21.40	100.00	10.80	14.90	13.32	58.2%	10	7
0	2	135.6%	22.50	14.20	18.30	105.00	—	—	—	—	—	—
14	10	63.9%	3.41	0.00	4.00	110.00	18.40	22.50	12.00	58.4%	1	1
29	1	122.9%	12.00	9.50	13.70	115.00	—	—	—	—	—	—
17	2	56.7%	2.00	0.00	3.30	120.00	—	—	—	—	—	—
0	5	12.5%	8.10	0.00	0.00	125.00	—	—	—	—	—	—
1	—	65.3%	2.60	0.00	3.00	130.00	—	—	—	—	—	—
3	1	70.5%	2.00	0.00	3.10	135.00	—	—	—	—	—	—
1	1	73.9%	1.55	0.00	2.95	140.00	—	—	—	—	—	—
0	1	25.0%	4.20	0.00	0.00	145.00	—	—	—	—	—	—
143	1	81.6%	2.35	0.05	2.85	150.00	—	—	—	—	—	—
40	1	84.6%	1.80	0.00	2.80	155.00	—	—	—	—	—	—
3	1	87.7%	1.40	0.00	2.75	160.00	—	—	—	—	—	—
5	1	90.8%	1.10	0.00	2.70	165.00	—	—	—	—	—	—
5	1	90.8%	0.90	0.00	2.30	170.00	—	—	—	—	—	—
9	1	93.4%	0.90	0.00	2.25	175.00	83.60	87.80	86.60	99.1%	—	1
22	1	96.3%	0.80	0.00	2.25	180.00	—	—	—	—	—	—

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 RYTM put/call ratio?

For the December 18, 2026 expiration, the RYTM put/call ratio based on open interest is 0.58 (207 puts vs 356 calls), and 0.35 based on today's volume. A ratio above 1 means more puts than calls.

What is RYTM's implied volatility?

At-the-money implied volatility for RYTM options expiring December 18, 2026 is about 0.8%, an annualized estimate of how much the market expects Rhythm Pharmaceuticals stock to move.

How many RYTM option expiration dates are there?

RYTM 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.