Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Rallybio Corp

RLYB · Nasdaq · CIK 0001739410 · Healthcare · Biotechnology

INSIDER SIGNAL

53.3 / 100

1 buyers · 14 purchase transaction lines · $4.2M gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeStrong
RoleModerate
RecencyLow
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+7.0 / 35
Purchase size+21.5 / 25
Role+14.0 / 20
Recency+0.8 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 1 insider(s), not 4+
  • ⚠ Role scores low · most senior buyer: TenPercentOwner (CEO, chair and 10% owners score lowest)
  • ⚠ Purchase activity is becoming less recent

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
ADAR1 Capital Management, LLC; Schneeberger DanielTenPercentOwner
●●●●●●●●
Lieber Jonathan IChief Financial Officer
○○
Liu HuiDirector
○
Chung WendyDirector
○
Boudreau Helen MDirector
○
Uden StephenChief Executive Officer
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 1 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: ADAR1 Capital Management, LLC; Schneeberger Daniel · $4.2M
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-04–2026-05-19

Roles in the peak window: TenPercentOwner. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

53.3 / 100

Latest recorded score

→ +0.0 ptsversus the previous recorded snapshot
  1. 53.4
  2. 53.4
  3. 53.4
  4. 53.3
  5. 53.3

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

14Purchases
1Sales
11Other Form 4 lines
12SEC filings · 365 days
BUYING14 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER10 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot detected in parsed evidence

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
+1.6%
3M
+7.1%
6M
+101.7%
12M
+269.4%

Volatility & liquidity

Volatility
97.4%
Beta
—
Avg daily value
USD 329,378

Valuation

Market cap
USD 90.4M
P/E
—

Fundamentals

Profit margin
—
ROE
-15.5%
Industry
Biotechnology

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-07-30 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
49,245
Previous report
55,556
Avg daily volume
10,095
Days to cover
4.9

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-05-19ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock10,200USD 13.98USD 142,560SEC filing ↗
2026-05-18ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock6,009USD 13.98USD 84,006SEC filing ↗
2026-05-15ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock300USD 13.90USD 4,170SEC filing ↗
2026-05-13ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock79,259USD 13.99USD 1,108,810SEC filing ↗
2026-05-12ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock800USD 13.83USD 11,064SEC filing ↗
2026-05-11ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock50,000USD 14.00USD 700,000SEC filing ↗
2026-05-05ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock35,101USD 14.00USD 491,414SEC filing ↗
2026-05-04ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock120,804USD 13.97USD 1,687,359SEC filing ↗
2023-03-14Lieber Jonathan IPurchase (P)Common Stock5,000USD 5.21USD 26,050SEC filing ↗
2022-03-21Fryer Jeffrey MPurchase (P)Common Stock3,000USD 8.04USD 24,120SEC filing ↗
2022-01-19Fryer Jeffrey MPurchase (P)Common Stock1,400USD 8.70USD 12,180SEC filing ↗
2022-01-13Uden StephenPurchase (P)Common Stock5,000USD 9.15USD 45,752SEC filing ↗
2022-01-12Uden StephenPurchase (P)Common Stock5,000USD 10.55USD 52,750SEC filing ↗
2022-01-11MACKAY MARTINPurchase (P)Common Stock4,496USD 10.65USD 47,882SEC filing ↗
2022-01-10MACKAY MARTINPurchase (P)Common Stock5,504USD 10.10USD 55,590SEC filing ↗

Form 4 evidence

26 transaction lines in the latest 365-day window; 69 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Hopfner Robert LorneOption exercise / conversion (M)Common Stock14,820USD 7.41USD 109,875SEC filing ↗
2026-10-09Lieber Jonathan IOption exercise / conversion (M)Common Stock3,910USD 6.08USD 23,773SEC filing ↗
2026-10-06Uden StephenOption exercise / conversion (M)Common Stock22,456USD 6.08USD 136,532SEC filing ↗
Show recent Form 4 evidence (17 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Hopfner Robert LorneOption exercise / conversion (M)Common Stock14,820USD 7.41USD 109,875SEC filing ↗
2026-10-09Lieber Jonathan IOption exercise / conversion (M)Common Stock3,910USD 6.08USD 23,773SEC filing ↗
2026-10-06Uden StephenOption exercise / conversion (M)Common Stock22,456USD 6.08USD 136,532SEC filing ↗
2026-09-29Lieber Jonathan IOption exercise / conversion (M)Common Stock5,000USD 6.08USD 30,400SEC filing ↗
2026-09-24Liu HuiOption exercise / conversion (M)Common Stock12,044USD 6.06USD 72,941SEC filing ↗
2026-09-16Chung WendyOption exercise / conversion (M)Common Stock3,562USD 2.38USD 8,478SEC filing ↗
2026-07-06Boudreau Helen MOption exercise / conversion (M)Common Stock3,562USD 2.38USD 8,478SEC filing ↗
2026-05-19ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock10,200USD 13.98USD 142,560SEC filing ↗
2026-05-18ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock6,009USD 13.98USD 84,006SEC filing ↗
2026-05-15ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock300USD 13.90USD 4,170SEC filing ↗
2026-05-13ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock79,259USD 13.99USD 1,108,810SEC filing ↗
2026-05-12ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock800USD 13.83USD 11,064SEC filing ↗
2026-05-11ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock50,000USD 14.00USD 700,000SEC filing ↗
2026-05-05ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock35,101USD 14.00USD 491,414SEC filing ↗
2026-05-04ADAR1 Capital Management, LLC; Schneeberger DanielPurchase (P)Common Stock120,804USD 13.97USD 1,687,359SEC filing ↗
2026-02-23Lieber Jonathan ISale (S)Common Stock789USD 5.06USD 3,992SEC filing ↗
2026-02-18Lieber Jonathan IAward / grant (A)Common Stock2,500USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerRLYB
CIK0001739410
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history69 transaction lines from 2021-07-28 to 2026-10-12
30 P purchase lines · 15 S sale lines · 24 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.