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RLYB — structural market context

Rallybio Corporation

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 Nov 4. Each line shows the earlier value, the later value and their dates.

Price

Change from the Nov 3 close to the Nov 4 close: +0.25%.

Volume

2.66× its 20-session average on Nov 4.

Includes pre- and post-market trading.

Short interest

Short interest 41K shares (settlement Oct 15) vs 49K (Sep 30).

No new file loaded in this window. Latest file: settlement Oct 15, loaded Oct 27.

Fails-to-deliver

Latest file (settlements Oct 1–Oct 14, published Nov 3): 2 days with fails, largest 195 shares on Oct 8.

Previous file (settlements Sep 15–Sep 30, published Oct 16): 2 days with fails, largest 502 shares on Sep 17.

Insider filings (Form 4)

None recorded in this window.

RLYB events and their magnitude

Latest SEC filing in the event study

Form 4 · other · filed 2026-11-03 · View on sec.gov ↗

…

How the Event Study works →

RLYB short interest & days to cover

SHARES SHORT
41K
% OF FLOAT
1.4%
DAYS TO COVER
7.4
CHANGE VS PRIOR
-16.8%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-10-15 (21d ago)

How short interest and days to cover are measured →

RLYB fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-10-09 · 27d149$16.99
2026-10-08 · 28d195$16.93
2026-09-21 · 45d232$17.19

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

How fails-to-deliver are reported →

RLYB insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 0 purchases · 1 sale

InsiderTypeSharesValueFiled
Lieber Jonathan I · officer: Chief Financial OfficerSale (S)599$10K2026-10-28

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.

Form 4 transaction codes explained →

Frequently asked questions

What is RLYB's short interest?
As of the FINRA settlement date 2026-10-15, RLYB had 41K shares sold short — 1.4% of its float, with 7.4 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 RLYB?
In the last 12 months of SEC Form 4 filings, RLYB recorded 0 insider purchases and 1 sale 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 RLYB?
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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RLYB: 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.

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