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SEPN — structural market context

Septerna, Inc.

Structural market context from public regulatory and market data, shown with its as-of dates. Descriptive only: nothing on this page is a recommendation, a prediction, or advice to buy or sell any security.

What changed

As of the close on Oct 23. Each line shows the earlier value, the later value and their dates.

Price

Close $40.41 (Oct 23) vs $40.88 (Oct 22): −1.15%.

Volume

0.49× its 20-session average (411K) on Oct 23.

Includes pre- and post-market trading.

Short interest

Short interest 3.1M shares (settlement Sep 30) vs 2.9M (Sep 15).

No new publication in this window. Latest: settlement Sep 30, published Oct 10.

Insider filings (Form 4)

None recorded in this window.

SEPN events and their magnitude

Latest SEC filing in the event study

Form 4 · other · filed 2026-10-19 · View on sec.gov ↗

…

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SEPN short interest & days to cover

SHARES SHORT
3.1M
% OF FLOAT
15.8%
DAYS TO COVER
8.8
CHANGE VS PRIOR
+7.0%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-09-30 (25d ago)

SEPN fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-08-27 · 59d28$40.25
2026-08-12 · 74d25K$47.76
2026-08-11 · 75d812$38.85

SEC fails-to-deliver files, published twice a month with ~6 weeks of delay.

SEPN insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 0 purchases · 6 sales

InsiderTypeSharesValueFiled
Bhatt Elizabeth · officer: President and COOSale (S)1K$40K2026-10-19
Bhatt Elizabeth · officer: President and COOSale (S)3K$109K2026-10-19
Long Daniel D. · officer: SVP, Drug DiscoverySale (S)3K$126K2026-09-03
Third Rock Ventures V, L.P. · 10 percent ownerSale (S)147K$7.4M2026-08-14
Third Rock Ventures V, L.P. · 10 percent ownerSale (S)141$7K2026-08-14

SEC Form 4 filings: purchases and sales reported on Form 4 (transaction codes P and S) only; grants and option exercises excluded. Attributed public records.

Frequently asked questions

What is SEPN's short interest?
As of the FINRA settlement date 2026-09-30, SEPN had 3.1M shares sold short — 15.8% of its float, with 8.8 days to cover at average volume. FINRA publishes this data roughly two weeks after each twice-monthly settlement, so it is inherently delayed. A short-interest figure describes an aggregate position; it does not predict what the stock will do.
Are insiders buying SEPN?
In the last 12 months of SEC Form 4 filings, SEPN recorded 0 insider purchases and 6 sales reported on Form 4 (transaction codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.
Is this page telling me to buy or sell SEPN?
No. Everything on this page is descriptive, structural market context from public data, shown with its as-of dates. TradeAI News does not issue directional recommendations, price predictions, or buy/sell advice — for any ticker.
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SEPN: the full history

Latest rows shown. Full history, market-wide screens, cluster detection and the context journal live in the dashboard.

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Not financial advice. Trading involves risk. Descriptive structural context, never a recommendation.