TransAlta (TAC) Options Chain

NYSE: TACUtilitiesElectric Utilities: CentralUSD

13.13+0.24 (+1.86%)

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

Expiration date

Expiration: Nov 20, 2026
Days to expiration: 40
Share price: $13.13
Put/call ratio (OI): 0.07
Put/call ratio (volume): 0.47
ATM implied volatility: 26.1%
Expected move: ±$1.13
Open interest (C / P): 17.70K / 1.24K

TAC options summary

The TAC options chain for the November 20, 2026 expiration lists 18 call and 14 put contracts, with 40 days until expiration. Open interest stands at 17,703 calls and 1,238 puts, a put/call ratio of 0.07, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $13.00 strike is 26.1%, which implies the market expects a move of about ±$1.13 (8.6%) in TransAlta stock by expiration.

The most open interest sits at the $20.00 call (4.12K contracts) and the $15.00 put (607 contracts).

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

TAC options chain · November 20, 2026

TAC 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
2	2	419.5%	10.42	8.60	12.80	3.00	0.00	0.25	0.10	275.8%	5	40
49	3	362.1%	8.70	5.50	9.20	5.00	0.00	0.75	0.05	245.7%	20	38
154	7	142.2%	5.10	4.30	5.50	8.00	0.00	0.05	0.05	75.8%	20	22
4	5	116.2%	4.06	3.30	4.50	9.00	0.00	0.00	0.60	25.0%	—	0
665	1	55.9%	3.01	3.10	3.30	10.00	0.00	0.75	0.25	93.2%	3	23
74	2	59.4%	1.63	2.20	2.55	11.00	0.05	0.75	0.24	72.8%	2	249
58	1	61.9%	1.25	0.95	1.70	12.00	0.05	0.80	0.49	52.3%	2	59
562	3	50.6%	0.82	0.80	0.95	13.00	0.00	0.00	1.37	1.6%	13	0
TAC $13.13
254	1	50.8%	0.51	0.00	0.55	14.00	1.15	1.85	2.53	55.6%	1	17
3,530	27	51.2%	0.24	0.20	0.30	15.00	1.95	2.65	2.32	60.2%	3	607
0	1	12.5%	0.30	0.00	0.00	16.00	—	—	—	—	—	—
1,947	1	55.1%	0.05	0.00	0.10	17.00	4.70	5.90	4.96	150.0%	40	75
78	19	89.8%	0.60	0.00	0.70	18.00	—	—	—	—	—	—
4,117	2	78.7%	0.11	0.00	0.20	20.00	5.50	8.10	5.50	171.5%	8	108
1,013	8	91.8%	0.01	0.00	0.20	22.00	—	—	—	—	—	—
2,667	5	96.1%	0.01	0.00	0.10	25.00	—	—	—	—	—	—
510	2	131.3%	0.09	0.00	0.20	30.00	16.00	19.30	17.40	209.0%	—	0
2,019	159	155.1%	0.05	0.00	0.25	35.00	20.70	23.70	22.40	187.3%	—	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 TAC put/call ratio?

For the November 20, 2026 expiration, the TAC put/call ratio based on open interest is 0.07 (1,238 puts vs 17,703 calls), and 0.47 based on today's volume. A ratio above 1 means more puts than calls.

What is TAC's implied volatility?

At-the-money implied volatility for TAC options expiring November 20, 2026 is about 26.1%, an annualized estimate of how much the market expects TransAlta stock to move.

How many TAC option expiration dates are there?

TAC has 4 listed expiration dates, from Oct 16, 2026 to Mar 19, 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.