TAC · Transalta Corp

Track TAC — free

$12.71 -0.08 (-0.63%)

Market Cap

$4.05B

316.30M

Options Chain

Underlying $12.71 · today Options Calculator

Positioning

Aug 21, 2026 · 4 days to expiry · 44 contracts · mixed snapshot sessions · Oct 16, 2025–Aug 17, 2026; 9 unknown

Put / call OI

—

dated and unknown snapshot sessions

Open interest

—

dated and unknown snapshot sessions

Volume

—

dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 4d Sep 18 32d Nov 20 95d Dec 18 123d Mar 19 214d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
1	14	704%	0.99	$9.57		$0.14	—	—	1	1
Call · $3 In the money Snapshot session Jul 29, 2026 Last $9.57 Breakeven $12.57 Implied vol 704% Delta 0.99 ≈99% ITM Gamma 0.003 Theta -0.03 Vega 0 Open interest 1 Model this call Put · $3 Snapshot session Aug 10, 2026 Last $0.14 Breakeven $2.86 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
10	10	467.6%	0.985	$7.60		—	—	—	—	0
Call · $5 In the money Snapshot session Aug 13, 2026 Last $7.60 Breakeven $12.60 Implied vol 467.6% Delta 0.985 ≈98% ITM Gamma 0.006 Theta -0.03 Vega 0 Open interest 10 Model this call Put · $5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	385.6%	0.981	—		—	—	—	—	0
Call · $6 In the money Snapshot session Unknown Last — Breakeven — Implied vol 385.6% Delta 0.981 ≈98% ITM Gamma 0.009 Theta -0.029 Vega 0 Open interest 0 Model this call Put · $6 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	363.4%	0.961	$7.06		$0.10	—	—	1	1
Call · $7 In the money Snapshot session Apr 9, 2026 Last $7.06 Breakeven $14.06 Implied vol 363.4% Delta 0.961 ≈96% ITM Gamma 0.018 Theta -0.051 Vega 0.001 Open interest 1 Model this call Put · $7 Snapshot session Aug 11, 2026 Last $0.10 Breakeven $6.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
1	1	295.8%	0.952	$7.00		$0.10	—	—	1	1
Call · $8 In the money Snapshot session Nov 20, 2025 Last $7.00 Breakeven $15.00 Implied vol 295.8% Delta 0.952 ≈95% ITM Gamma 0.026 Theta -0.05 Vega 0.001 Open interest 1 Model this call Put · $8 Snapshot session Nov 21, 2025 Last $0.10 Breakeven $7.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
0	3	231.2%	0.94	$4.30		—	—	—	—	0
Call · $9 In the money Snapshot session Mar 27, 2026 Last $4.30 Breakeven $13.30 Implied vol 231.2% Delta 0.94 ≈94% ITM Gamma 0.039 Theta -0.046 Vega 0.002 Open interest 0 Model this call Put · $9 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
12	3	172%	0.921	$4.48		$0.05	-0.165	275.1%	1	1.1k
Call · $10 In the money Snapshot session Jul 10, 2026 Last $4.48 Breakeven $14.48 Implied vol 172% Delta 0.921 ≈92% ITM Gamma 0.064 Theta -0.042 Vega 0.002 Open interest 12 Model this call Put · $10 Snapshot session Jul 28, 2026 Last $0.05 Breakeven $9.95 Implied vol 275.1% Delta -0.165 ≈17% ITM Gamma 0.068 Theta -0.114 Vega 0.003 Open interest 1.1k Model this put
2	2	128.2%	0.875	$2.20		$0.54	-0.156	146.7%	1	5
Call · $11 In the money Snapshot session May 1, 2026 Last $2.20 Breakeven $13.20 Implied vol 128.2% Delta 0.875 ≈87% ITM Gamma 0.122 Theta -0.044 Vega 0.003 Open interest 2 Model this call Put · $11 Snapshot session Jun 5, 2026 Last $0.54 Breakeven $10.46 Implied vol 146.7% Delta -0.156 ≈16% ITM Gamma 0.122 Theta -0.058 Vega 0.003 Open interest 5 Model this put
27	1	55.8%	0.843	$0.80		$0.10	-0.231	79.3%	23	52
Call · $12 In the money Snapshot session Aug 14, 2026 Last $0.80 Breakeven $12.80 Implied vol 55.8% Delta 0.843 ≈84% ITM Gamma 0.322 Theta -0.022 Vega 0.003 Open interest 27 Model this call Put · $12 Snapshot session Aug 14, 2026 Last $0.10 Breakeven $11.90 Implied vol 79.3% Delta -0.231 ≈23% ITM Gamma 0.291 Theta -0.04 Vega 0.005 Open interest 52 Model this put
Underlying $12.71
550	158	49.9%	0.344	$0.15		$0.75	-0.649	52.3%	1	1k
Call · $13 Snapshot session Aug 17, 2026 Last $0.15 Breakeven $13.15 Implied vol 49.9% Delta 0.344 ≈34% ITM Gamma 0.558 Theta -0.031 Vega 0.005 Open interest 550 Model this call Put · $13 In the money Snapshot session Aug 6, 2026 Last $0.75 Breakeven $12.25 Implied vol 52.3% Delta -0.649 ≈65% ITM Gamma 0.539 Theta -0.032 Vega 0.005 Open interest 1k Model this put
772	10	96.1%	0.184	$0.02		$1.43	—	—	1	10
Call · $14 Snapshot session Aug 14, 2026 Last $0.02 Breakeven $14.02 Implied vol 96.1% Delta 0.184 ≈18% ITM Gamma 0.207 Theta -0.042 Vega 0.004 Open interest 772 Model this call Put · $14 In the money Snapshot session Aug 14, 2026 Last $1.43 Breakeven $12.57 Implied vol — Delta — Gamma — Theta — Vega — Open interest 10 Model this put
4.6k	6	118.3%	0.103	$0.02		$2.80	—	—	1	28
Call · $15 Snapshot session Aug 14, 2026 Last $0.02 Breakeven $15.02 Implied vol 118.3% Delta 0.103 ≈10% ITM Gamma 0.113 Theta -0.035 Vega 0.003 Open interest 4.6k Model this call Put · $15 In the money Snapshot session Aug 3, 2026 Last $2.80 Breakeven $12.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 28 Model this put
236	50	243.6%	0.222	$0.01		—	—	—	—	0
Call · $16 Snapshot session Aug 4, 2026 Last $0.01 Breakeven $16.01 Implied vol 243.6% Delta 0.222 ≈22% ITM Gamma 0.092 Theta -0.12 Vega 0.004 Open interest 236 Model this call Put · $16 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
966	4	193.2%	0.089	$0.05		$3.42	—	—	1	0
Call · $17 Snapshot session Jul 28, 2026 Last $0.05 Breakeven $17.05 Implied vol 193.2% Delta 0.089 ≈9% ITM Gamma 0.063 Theta -0.052 Vega 0.003 Open interest 966 Model this call Put · $17 In the money Snapshot session Oct 16, 2025 Last $3.42 Breakeven $13.58 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
290	30	205.5%	0.066	$0.20		—	—	—	—	0
Call · $18 Snapshot session Jun 17, 2026 Last $0.20 Breakeven $18.20 Implied vol 205.5% Delta 0.066 ≈7% ITM Gamma 0.047 Theta -0.044 Vega 0.002 Open interest 290 Model this call Put · $18 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $19 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $19 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1.7k	2	251.5%	0.056	$0.07		$5.70	—	—	2	0
Call · $20 Snapshot session Jul 7, 2026 Last $0.07 Breakeven $20.07 Implied vol 251.5% Delta 0.056 ≈6% ITM Gamma 0.033 Theta -0.047 Vega 0.002 Open interest 1.7k Model this call Put · $20 In the money Snapshot session Jun 1, 2026 Last $5.70 Breakeven $14.30 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
50	50	—	—	$0.08		—	—	—	—	0
Call · $21 Snapshot session Jun 24, 2026 Last $0.08 Breakeven $21.08 Implied vol — Delta — Gamma — Theta — Vega — Open interest 50 Model this call Put · $21 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
95	10	426%	0.159	$0.06		$9.46	—	—	2	0
Call · $22 Snapshot session May 14, 2026 Last $0.06 Breakeven $22.06 Implied vol 426% Delta 0.159 ≈16% ITM Gamma 0.042 Theta -0.171 Vega 0.003 Open interest 95 Model this call Put · $22 In the money Snapshot session Feb 4, 2026 Last $9.46 Breakeven $12.54 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
316	1	—	—	$0.16		$12.45	—	—	2	0
Call · $25 Snapshot session Apr 15, 2026 Last $0.16 Breakeven $25.16 Implied vol — Delta — Gamma — Theta — Vega — Open interest 316 Model this call Put · $25 In the money Snapshot session Feb 4, 2026 Last $12.45 Breakeven $12.55 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
2	4	437.7%	0.048	$0.05		$17.40	—	—	4	0
Call · $30 Snapshot session Jun 26, 2026 Last $0.05 Breakeven $30.05 Implied vol 437.7% Delta 0.048 ≈5% ITM Gamma 0.017 Theta -0.072 Vega 0.001 Open interest 2 Model this call Put · $30 In the money Snapshot session Feb 4, 2026 Last $17.40 Breakeven $12.60 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1.4k	1.4k	469.5%	0.035	$0.06		$22.45	—	—	4	0
Call · $35 Snapshot session May 26, 2026 Last $0.06 Breakeven $35.06 Implied vol 469.5% Delta 0.035 ≈3% ITM Gamma 0.012 Theta -0.059 Vega 0.001 Open interest 1.4k Model this call Put · $35 In the money Snapshot session Feb 4, 2026 Last $22.45 Breakeven $12.55 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Oct 16, 2025–Aug 17, 2026; 9 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1144800 CUSIP 89346D107 13F (30d) 168 filings 168 filers Visit website Investor relations