Halozyme Therapeutics (HALO) Options Chain

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

110.42+0.58 (+0.53%)

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

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 6
Share price: $110.42
Put/call ratio (OI): 0.49
Put/call ratio (volume): 0.31
ATM implied volatility: 47.6%
Expected move: ±$6.73
Open interest (C / P): 724 / 352

HALO options summary

The HALO options chain for the October 16, 2026 expiration lists 10 call and 11 put contracts, with 6 days until expiration. Open interest stands at 724 calls and 352 puts, a put/call ratio of 0.49, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $110.00 strike is 47.6%, which implies the market expects a move of about ±$6.73 (6.1%) in Halozyme Therapeutics stock by expiration.

The most open interest sits at the $115.00 call (288 contracts) and the $110.00 put (141 contracts).

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

HALO options chain · October 16, 2026

HALO 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	1	128.3%	33.15	28.70	32.60	80.00	0.00	2.15	0.50	179.9%	—	1
0	1	97.5%	18.39	18.90	22.70	90.00	0.00	2.15	0.05	127.6%	1	1
19	6	76.5%	15.52	13.90	17.70	95.00	0.00	2.15	0.05	102.4%	2	5
20	2	51.5%	13.62	8.70	12.70	100.00	0.00	1.00	0.10	60.1%	1	35
28	11	80.9%	4.40	4.00	8.00	105.00	0.15	0.60	0.20	40.3%	1	130
171	2	50.7%	2.75	1.00	3.30	110.00	0.15	2.50	1.40	44.4%	3	141
HALO $110.42
288	35	62.1%	0.92	0.45	2.00	115.00	3.40	6.40	4.00	58.9%	1	26
135	7	57.5%	0.25	0.00	0.70	120.00	7.50	11.50	7.80	85.2%	9	11
59	1	73.6%	0.11	0.00	1.30	125.00	—	—	—	—	—	—
4	4	90.3%	0.39	0.00	1.35	130.00	17.40	21.20	12.36	117.7%	2	0
—	—	—	—	—	—	135.00	22.40	26.20	27.17	134.5%	1	2
—	—	—	—	—	—	145.00	32.40	36.10	36.50	161.4%	1	0

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 HALO put/call ratio?

For the October 16, 2026 expiration, the HALO put/call ratio based on open interest is 0.49 (352 puts vs 724 calls), and 0.31 based on today's volume. A ratio above 1 means more puts than calls.

What is HALO's implied volatility?

At-the-money implied volatility for HALO options expiring October 16, 2026 is about 47.6%, an annualized estimate of how much the market expects Halozyme Therapeutics stock to move.

How many HALO option expiration dates are there?

HALO 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.