CGEM · Cullinan Therapeutics, Inc. · Options Chain

Track CGEM — free

$20.59 -0.41 (-1.95%) At close · Sep 11

Russell 2000 member Rebalance outlook locked

Market Cap

$1.33B

64.35M

Options Chain

Underlying $20.59 · at close Sep 11, 2026 Options Calculator

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Positioning

Sep 18, 2026 · 5 days to expiry · 42 contracts · mixed daily-bar sessions · Aug 24, 2026–Sep 11, 2026; 31 unknown

Put / call OI

12.45

Put-heavy positioning

Open interest

2,314

as of Sep 10, 2026

Volume

—

dated and unknown daily-bar sessions

Max pain

$22.00

$1.41 above spot

ATM implied vol

246.1%

market's expected move

Open interest by strike

Calls Puts

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Sep 18 5d Oct 16 33d Dec 18 96d Jan 15 124d Mar 19 187d Apr 16 215d Jun 17 277d Dec 17 460d

Calls								Puts
OI	Vol	IV	Δ	Bid	Ask	Last	Strike	Last	Bid	Ask	Δ	IV	Vol	OI
—	—	—	—	$9.00	$12.80	—		—	$0.00	$4.90	—	—	—	—
Call · $10 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.164 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $10 Daily-bar session Unknown Quote as of 2026-09-11 14:42:32.026 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$8.00	$11.80	—		—	$0.00	$4.90	—	—	—	—
Call · $11 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.364 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $11 Daily-bar session Unknown Quote as of 2026-09-11 14:42:46.426 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$7.00	$10.80	—		—	$0.00	$4.90	—	—	—	—
Call · $12 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.451 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $12 Daily-bar session Unknown Quote as of 2026-09-11 14:42:24.827 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$6.00	$9.80	—		—	$0.00	$4.90	—	—	—	—
Call · $13 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:02.906 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $13 Daily-bar session Unknown Quote as of 2026-09-11 19:59:16.513 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$5.10	$9.00	—		—	$0.00	$4.90	—	—	—	—
Call · $14 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:58:26.357 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $14 Daily-bar session Unknown Quote as of 2026-09-11 19:59:16.511 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
7	5	—	—	$4.10	$8.00	$7.63		—	$0.00	$4.90	—	—	—	—
Call · $15 In the money Daily-bar session Aug 27, 2026 Quote as of 2026-09-11 19:59:29.607 UTC Last $7.63 Breakeven $22.63 Implied vol — Delta — Gamma — Theta — Vega — Open interest 7 OI effective date Sep 10, 2026 Model this call Put · $15 Daily-bar session Unknown Quote as of 2026-09-11 19:59:16.511 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$3.20	$7.00	—		—	$0.00	$4.90	—	—	—	—
Call · $16 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:02.752 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $16 Daily-bar session Unknown Quote as of 2026-09-11 19:55:48.985 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$2.40	$6.00	—		—	$0.00	$4.90	—	—	—	—
Call · $17 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.164 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $17 Daily-bar session Unknown Quote as of 2026-09-11 19:55:08.384 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
36	1	135.9%	0.843	$1.40	$5.50	$4.98		$0.60	$0.00	$2.05	—	—	80	855
Call · $18 In the money Daily-bar session Aug 24, 2026 Quote as of 2026-09-11 19:59:24.568 UTC Last $4.98 Breakeven $22.98 Implied vol 135.9% Delta 0.843 ≈84% ITM Gamma 0.065 Theta -0.075 Vega 0.007 Open interest 36 OI effective date Sep 10, 2026 Model this call Put · $18 Daily-bar session Aug 31, 2026 Quote as of 2026-09-11 19:59:24.569 UTC Last $0.60 Breakeven $17.40 Implied vol — Delta — Gamma — Theta — Vega — Open interest 855 OI effective date Sep 10, 2026 Model this put
3	3	153.1%	0.738	$0.80	$4.90	$3.60		$0.90	$0.40	$1.45	-0.28	175%	157	884
Call · $19 In the money Daily-bar session Aug 24, 2026 Quote as of 2026-09-11 19:59:32.466 UTC Last $3.60 Breakeven $22.60 Implied vol 153.1% Delta 0.738 ≈74% ITM Gamma 0.079 Theta -0.114 Vega 0.009 Open interest 3 OI effective date Sep 10, 2026 Model this call Put · $19 Daily-bar session Sep 10, 2026 Quote as of 2026-09-11 19:59:25.606 UTC Last $0.90 Breakeven $18.10 Implied vol 175% Delta -0.28 ≈28% ITM Gamma 0.071 Theta -0.132 Vega 0.009 Open interest 884 OI effective date Sep 10, 2026 Model this put
8	1	184.8%	0.637	$0.20	$4.90	$2.50		$1.20	$0.35	$4.70	-0.37	292.3%	2	261
Call · $20 In the money Daily-bar session Aug 24, 2026 Quote as of 2026-09-11 19:59:28.574 UTC Last $2.50 Breakeven $22.50 Implied vol 184.8% Delta 0.637 ≈64% ITM Gamma 0.075 Theta -0.158 Vega 0.01 Open interest 8 OI effective date Sep 10, 2026 Model this call Put · $20 Daily-bar session Sep 11, 2026 Quote as of 2026-09-11 19:59:53.673 UTC Last $1.20 Breakeven $18.80 Implied vol 292.3% Delta -0.37 ≈37% ITM Gamma 0.048 Theta -0.248 Vega 0.01 Open interest 261 OI effective date Sep 10, 2026 Model this put
Underlying $20.59
—	—	246.1%	0.57	$0.70	$4.70	—		—	$0.00	$4.90	—	—	—	—
Call · $21 Daily-bar session Unknown Quote as of 2026-09-11 19:59:53.354 UTC Last — Breakeven — Implied vol 246.1% Delta 0.57 ≈57% ITM Gamma 0.059 Theta -0.219 Vega 0.011 Open interest — OI effective date — Model this call Put · $21 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:59:56.589 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
68	17	—	—	$0.00	$2.50	$1.60		$2.00	$0.50	$4.90	-0.51	203.3%	1	142
Call · $22 Daily-bar session Sep 8, 2026 Quote as of 2026-09-11 19:59:56.053 UTC Last $1.60 Breakeven $23.60 Implied vol — Delta — Gamma — Theta — Vega — Open interest 68 OI effective date Sep 10, 2026 Model this call Put · $22 In the money Daily-bar session Sep 4, 2026 Quote as of 2026-09-11 19:59:24.686 UTC Last $2.00 Breakeven $20.00 Implied vol 203.3% Delta -0.51 ≈51% ITM Gamma 0.073 Theta -0.182 Vega 0.011 Open interest 142 OI effective date Sep 10, 2026 Model this put
49	10	313.4%	0.496	$0.40	$4.90	$1.80		—	$1.00	$5.20	-0.6	180.1%	—	—
Call · $23 Daily-bar session Aug 31, 2026 Quote as of 2026-09-11 19:55:49.779 UTC Last $1.80 Breakeven $24.80 Implied vol 313.4% Delta 0.496 ≈50% ITM Gamma 0.047 Theta -0.283 Vega 0.011 Open interest 49 OI effective date Sep 10, 2026 Model this call Put · $23 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.079 UTC Last — Breakeven — Implied vol 180.1% Delta -0.6 ≈60% ITM Gamma 0.079 Theta -0.155 Vega 0.011 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$4.80	—		—	$2.00	$5.90	-0.652	193.5%	—	—
Call · $24 Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.114 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $24 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.308 UTC Last — Breakeven — Implied vol 193.5% Delta -0.652 ≈65% ITM Gamma 0.071 Theta -0.16 Vega 0.01 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$4.90	—		—	$2.50	$6.50	-0.747	169.7%	—	—
Call · $25 Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.121 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $25 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.079 UTC Last — Breakeven — Implied vol 169.7% Delta -0.747 ≈75% ITM Gamma 0.07 Theta -0.12 Vega 0.009 Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$4.90	—		—	$3.50	$7.40	—	—	—	—
Call · $26 Daily-bar session Unknown Quote as of 2026-09-11 19:59:24.689 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $26 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:58:47.607 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$4.90	—		—	$4.50	$8.30	—	—	—	—
Call · $27 Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.213 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $27 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.451 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$4.90	—		—	$5.50	$9.20	—	—	—	—
Call · $28 Daily-bar session Unknown Quote as of 2026-09-11 19:59:16.511 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $28 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.613 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
—	—	—	—	$0.00	$0.95	—		—	$6.50	$10.10	—	—	—	—
Call · $29 Daily-bar session Unknown Quote as of 2026-09-11 19:55:01.127 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this call Put · $29 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:03.268 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put
1	1	—	—	$0.00	$4.90	$0.25		—	$7.50	$11.00	—	—	—	—
Call · $30 Daily-bar session Aug 25, 2026 Quote as of 2026-09-11 19:59:16.511 UTC Last $0.25 Breakeven $30.25 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 OI effective date Sep 10, 2026 Model this call Put · $30 In the money Daily-bar session Unknown Quote as of 2026-09-11 19:55:02.828 UTC Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest — OI effective date — Model this put

About this data

Each contract's last price, day range and volume belong to the daily-bar session shown in its details; unknown means the source omitted that timestamp. Open interest has its own effective date shown separately; implied volatility and greeks are model values computed when fetched. This chain has mixed daily-bar sessions · Aug 24, 2026–Sep 11, 2026; 31 unknown. Positioning totals are shown only when every returned open-interest value has the same known effective date. Bid and ask are real-time consolidated OPRA readings.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.

Key facts CIK 1789972 CUSIP 230031106 13F (30d) 65 filings 65 filers Visit website Investor relations