SEPN · Septerna, Inc.

Track SEPN — free

$40.79 -3.14 (-7.15%) At close · Aug 20

Market Cap

$1.89B

46.68M

Options Chain

Underlying $40.79 · at close Aug 20, 2026 Options Calculator

Positioning

Aug 21, 2026 · expires today · 62 contracts · mixed snapshot sessions · Jun 23, 2026–Aug 20, 2026; 41 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 0d Sep 18 28d Oct 16 56d Jan 15 147d Apr 16 238d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	1654.8%	0.91	—		$0.07	-0.045	1144.8%	3	3
Call · $20 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1654.8% Delta 0.91 ≈91% ITM Gamma 0.006 Theta -3.552 Vega 0.003 Open interest 0 Model this call Put · $20 Snapshot session Aug 11, 2026 Last $0.07 Breakeven $19.93 Implied vol 1144.8% Delta -0.045 ≈5% ITM Gamma 0.005 Theta -1.446 Vega 0.002 Open interest 3 Model this put
0	—	1757.3%	0.84	—		—	-0.063	814.7%	—	0
Call · $25 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1757.3% Delta 0.84 ≈84% ITM Gamma 0.008 Theta -5.652 Vega 0.004 Open interest 0 Model this call Put · $25 Snapshot session Unknown Last — Breakeven — Implied vol 814.7% Delta -0.063 ≈6% ITM Gamma 0.009 Theta -1.32 Vega 0.002 Open interest 0 Model this put
0	—	1279.6%	0.855	—		—	—	—	—	0
Call · $26 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1279.6% Delta 0.855 ≈86% ITM Gamma 0.011 Theta -3.874 Vega 0.003 Open interest 0 Model this call Put · $26 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	1248%	0.842	—		—	—	—	—	0
Call · $27 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1248% Delta 0.842 ≈84% ITM Gamma 0.012 Theta -4.032 Vega 0.003 Open interest 0 Model this call Put · $27 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	1062.7%	0.843	—		—	-0.078	648.4%	—	0
Call · $28 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1062.7% Delta 0.843 ≈84% ITM Gamma 0.014 Theta -3.395 Vega 0.004 Open interest 0 Model this call Put · $28 Snapshot session Unknown Last — Breakeven — Implied vol 648.4% Delta -0.078 ≈8% ITM Gamma 0.014 Theta -1.239 Vega 0.002 Open interest 0 Model this put
0	—	1107.3%	0.818	—		—	-0.084	597.1%	—	0
Call · $29 In the money Snapshot session Unknown Last — Breakeven — Implied vol 1107.3% Delta 0.818 ≈82% ITM Gamma 0.015 Theta -3.883 Vega 0.005 Open interest 0 Model this call Put · $29 Snapshot session Unknown Last — Breakeven — Implied vol 597.1% Delta -0.084 ≈8% ITM Gamma 0.016 Theta -1.211 Vega 0.002 Open interest 0 Model this put
1	1	977.4%	0.813	$9.70		$1.10	-0.097	567.5%	1	177
Call · $30 In the money Snapshot session Aug 7, 2026 Last $9.70 Breakeven $39.70 Implied vol 977.4% Delta 0.813 ≈81% ITM Gamma 0.017 Theta -3.493 Vega 0.005 Open interest 1 Model this call Put · $30 Snapshot session Jul 29, 2026 Last $1.10 Breakeven $28.90 Implied vol 567.5% Delta -0.097 ≈10% ITM Gamma 0.019 Theta -1.29 Vega 0.002 Open interest 177 Model this put
0	—	903.1%	0.799	—		$2.80	-0.106	519.3%	25	25
Call · $31 In the money Snapshot session Unknown Last — Breakeven — Implied vol 903.1% Delta 0.799 ≈80% ITM Gamma 0.019 Theta -3.354 Vega 0.005 Open interest 0 Model this call Put · $31 Snapshot session Jun 30, 2026 Last $2.80 Breakeven $28.20 Implied vol 519.3% Delta -0.106 ≈11% ITM Gamma 0.022 Theta -1.262 Vega 0.003 Open interest 25 Model this put
0	—	831.3%	0.784	—		—	-0.109	453.4%	—	0
Call · $32 In the money Snapshot session Unknown Last — Breakeven — Implied vol 831.3% Delta 0.784 ≈78% ITM Gamma 0.022 Theta -3.213 Vega 0.005 Open interest 0 Model this call Put · $32 Snapshot session Unknown Last — Breakeven — Implied vol 453.4% Delta -0.109 ≈11% ITM Gamma 0.026 Theta -1.127 Vega 0.003 Open interest 0 Model this put
4	2	674%	0.785	$10.30		—	-0.128	417.5%	—	0
Call · $33 In the money Snapshot session Aug 19, 2026 Last $10.30 Breakeven $43.30 Implied vol 674% Delta 0.785 ≈78% ITM Gamma 0.027 Theta -2.608 Vega 0.005 Open interest 4 Model this call Put · $33 Snapshot session Unknown Last — Breakeven — Implied vol 417.5% Delta -0.128 ≈13% ITM Gamma 0.031 Theta -1.153 Vega 0.004 Open interest 0 Model this put
1	1	608.2%	0.765	$5.80		—	-0.169	416.4%	—	0
Call · $34 In the money Snapshot session Jun 23, 2026 Last $5.80 Breakeven $39.80 Implied vol 608.2% Delta 0.765 ≈77% ITM Gamma 0.031 Theta -2.463 Vega 0.005 Open interest 1 Model this call Put · $34 Snapshot session Unknown Last — Breakeven — Implied vol 416.4% Delta -0.169 ≈17% ITM Gamma 0.037 Theta -1.381 Vega 0.004 Open interest 0 Model this put
1	1	639%	0.723	$2.08		$3.60	-0.215	421.5%	1	1
Call · $35 In the money Snapshot session Aug 3, 2026 Last $2.08 Breakeven $37.08 Implied vol 639% Delta 0.723 ≈72% ITM Gamma 0.032 Theta -2.835 Vega 0.005 Open interest 1 Model this call Put · $35 Snapshot session Jul 14, 2026 Last $3.60 Breakeven $31.40 Implied vol 421.5% Delta -0.215 ≈21% ITM Gamma 0.043 Theta -1.636 Vega 0.005 Open interest 1 Model this put
12	9	464.1%	0.72	$5.00		—	-0.266	417.2%	—	0
Call · $36 In the money Snapshot session Aug 20, 2026 Last $5.00 Breakeven $41.00 Implied vol 464.1% Delta 0.72 ≈72% ITM Gamma 0.045 Theta -2.067 Vega 0.005 Open interest 12 Model this call Put · $36 Snapshot session Unknown Last — Breakeven — Implied vol 417.2% Delta -0.266 ≈27% ITM Gamma 0.048 Theta -1.801 Vega 0.005 Open interest 0 Model this put
1	1	480.4%	0.668	$13.00		—	-0.322	431.3%	—	0
Call · $37 In the money Snapshot session Aug 12, 2026 Last $13.00 Breakeven $50.00 Implied vol 480.4% Delta 0.668 ≈67% ITM Gamma 0.047 Theta -2.326 Vega 0.006 Open interest 1 Model this call Put · $37 Snapshot session Unknown Last — Breakeven — Implied vol 431.3% Delta -0.322 ≈32% ITM Gamma 0.052 Theta -2.07 Vega 0.005 Open interest 0 Model this put
0	—	414.4%	0.624	—		—	-0.352	299.5%	—	0
Call · $38 In the money Snapshot session Unknown Last — Breakeven — Implied vol 414.4% Delta 0.624 ≈62% ITM Gamma 0.056 Theta -2.077 Vega 0.006 Open interest 0 Model this call Put · $38 Snapshot session Unknown Last — Breakeven — Implied vol 299.5% Delta -0.352 ≈35% ITM Gamma 0.077 Theta -1.475 Vega 0.006 Open interest 0 Model this put
1	1	428.1%	0.565	$7.00		—	-0.382	116.3%	—	0
Call · $39 In the money Snapshot session Aug 11, 2026 Last $7.00 Breakeven $46.00 Implied vol 428.1% Delta 0.565 ≈56% ITM Gamma 0.057 Theta -2.237 Vega 0.006 Open interest 1 Model this call Put · $39 Snapshot session Unknown Last — Breakeven — Implied vol 116.3% Delta -0.382 ≈38% ITM Gamma 0.203 Theta -0.585 Vega 0.006 Open interest 0 Model this put
226	10	442.4%	0.511	$2.15		—	—	—	—	0
Call · $40 In the money Snapshot session Aug 20, 2026 Last $2.15 Breakeven $42.15 Implied vol 442.4% Delta 0.511 ≈51% ITM Gamma 0.056 Theta -2.344 Vega 0.006 Open interest 226 Model this call Put · $40 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
Underlying $40.79
5	1	498.3%	0.471	$2.00		—	—	—	—	0
Call · $41 Snapshot session Aug 4, 2026 Last $2.00 Breakeven $43.00 Implied vol 498.3% Delta 0.471 ≈47% ITM Gamma 0.049 Theta -2.614 Vega 0.007 Open interest 5 Model this call Put · $41 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
2	1	534.1%	0.435	$1.00		—	—	—	—	0
Call · $42 Snapshot session Jul 30, 2026 Last $1.00 Breakeven $43.00 Implied vol 534.1% Delta 0.435 ≈43% ITM Gamma 0.046 Theta -2.782 Vega 0.007 Open interest 2 Model this call Put · $42 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	591.4%	0.41	—		—	—	—	—	0
Call · $43 Snapshot session Unknown Last — Breakeven — Implied vol 591.4% Delta 0.41 ≈41% ITM Gamma 0.041 Theta -3.071 Vega 0.007 Open interest 0 Model this call Put · $43 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	647%	0.394	$2.55		$1.10	—	—	5	5
Call · $44 Snapshot session Aug 19, 2026 Last $2.55 Breakeven $46.55 Implied vol 647% Delta 0.394 ≈39% ITM Gamma 0.037 Theta -3.318 Vega 0.006 Open interest 1 Model this call Put · $44 In the money Snapshot session Aug 13, 2026 Last $1.10 Breakeven $42.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 5 Model this put
0	—	425.2%	0.255	—		—	—	—	—	0
Call · $45 Snapshot session Unknown Last — Breakeven — Implied vol 425.2% Delta 0.255 ≈25% ITM Gamma 0.047 Theta -1.825 Vega 0.005 Open interest 0 Model this call Put · $45 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
2	2	405.6%	0.207	$4.46		—	—	—	—	0
Call · $46 Snapshot session Aug 12, 2026 Last $4.46 Breakeven $50.46 Implied vol 405.6% Delta 0.207 ≈21% ITM Gamma 0.043 Theta -1.523 Vega 0.005 Open interest 2 Model this call Put · $46 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	397%	0.163	$1.91		$2.74	—	—	3	3
Call · $47 Snapshot session Aug 11, 2026 Last $1.91 Breakeven $48.91 Implied vol 397% Delta 0.163 ≈16% ITM Gamma 0.038 Theta -1.295 Vega 0.005 Open interest 1 Model this call Put · $47 In the money Snapshot session Aug 13, 2026 Last $2.74 Breakeven $44.26 Implied vol — Delta — Gamma — Theta — Vega — Open interest 3 Model this put
2	2	400.2%	0.136	$3.40		—	—	—	—	0
Call · $48 Snapshot session Aug 11, 2026 Last $3.40 Breakeven $51.40 Implied vol 400.2% Delta 0.136 ≈14% ITM Gamma 0.034 Theta -1.156 Vega 0.003 Open interest 2 Model this call Put · $48 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	427.1%	0.129	—		—	—	—	—	0
Call · $49 Snapshot session Unknown Last — Breakeven — Implied vol 427.1% Delta 0.129 ≈13% ITM Gamma 0.03 Theta -1.185 Vega 0.003 Open interest 0 Model this call Put · $49 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
2	1	469%	0.132	$2.00		—	—	—	—	0
Call · $50 Snapshot session Aug 12, 2026 Last $2.00 Breakeven $52.00 Implied vol 469% Delta 0.132 ≈13% ITM Gamma 0.028 Theta -1.32 Vega 0.003 Open interest 2 Model this call Put · $50 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	593.2%	0.11	—		—	—	—	—	0
Call · $55 Snapshot session Unknown Last — Breakeven — Implied vol 593.2% Delta 0.11 ≈11% ITM Gamma 0.019 Theta -1.461 Vega 0.003 Open interest 0 Model this call Put · $55 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $60 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $60 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $65 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $65 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $70 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $70 In the money Snapshot session Unknown Last — Breakeven — 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 · Jun 23, 2026–Aug 20, 2026; 41 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. The 25 strikes around the money are shown by default — switch to "All 31" for the wings.

Key facts CIK 1984086 CUSIP 81734D104 13F (30d) 153 filings 151 filers Visit website Investor relations