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

Cabaletta Bio, Inc.

CABA · Nasdaq · CIK 0001759138 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

0 Form 4 transaction lines observed in the same window
0 sales · 0 option, withholding, award, gift or other lines

Last qualifying purchase2026-01-21 · Chang David J. · $19.9K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

No Form 4 transaction event is present in the current 180-day window.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-01-21 · Chang David J..

Recent Form 4 activity

8Purchases
0Sales
0Other Form 4 lines
8SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

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 has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

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

Shares short
38,613,761
Previous report
33,325,453
Avg daily volume
6,129,528
Days to cover
6.3

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
2026-01-21Tomasello ShawnPurchase (P)Common Stock22,725USD 2.21USD 50,222SEC filing ↗
2026-01-21Simon MarkPurchase (P)Common Stock11,061USD 2.28USD 25,219SEC filing ↗
2026-01-21Nichtberger StevenPurchase (P)Common Stock45,000USD 2.24USD 100,800SEC filing ↗
2026-01-21Gerard MichaelPurchase (P)Common Stock6,600USD 2.27USD 14,982SEC filing ↗
2026-01-21Gavel StevePurchase (P)Common Stock22,170USD 2.27USD 50,326SEC filing ↗
2026-01-21Chang David J.Purchase (P)Common Stock8,800USD 2.26USD 19,888SEC filing ↗
2026-01-21Bollard CatherinePurchase (P)Common Stock4,405USD 2.27USD 9,999SEC filing ↗
2026-01-21Binder GwendolynPurchase (P)Common Stock11,312USD 2.19USD 24,773SEC filing ↗
2022-10-19Nichtberger StevenPurchase (P)Common Stock8,127USD 1.25USD 10,159SEC filing ↗
2022-10-18Simon MarkPurchase (P)Common Stock125,000USD 0.98USD 122,500SEC filing ↗
2022-10-18Nichtberger StevenPurchase (P)Common Stock141,873USD 0.99USD 140,454SEC filing ↗
2022-10-18Marda AnupPurchase (P)Common Stock50,000USD 0.99USD 49,500SEC filing ↗
2022-10-18Bollard CatherinePurchase (P)Common Stock1,000USD 0.99USD 990SEC filing ↗
2022-10-18Binder GwendolynPurchase (P)Common Stock20,000USD 0.99USD 19,800SEC filing ↗

Form 4 evidence

8 transaction lines in the latest 365-day window; 50 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-01-21Tomasello ShawnPurchase (P)Common Stock22,725USD 2.21USD 50,222SEC filing ↗
2026-01-21Simon MarkPurchase (P)Common Stock11,061USD 2.28USD 25,219SEC filing ↗
2026-01-21Nichtberger StevenPurchase (P)Common Stock45,000USD 2.24USD 100,800SEC filing ↗
Show recent Form 4 evidence (8 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-01-21Tomasello ShawnPurchase (P)Common Stock22,725USD 2.21USD 50,222SEC filing ↗
2026-01-21Simon MarkPurchase (P)Common Stock11,061USD 2.28USD 25,219SEC filing ↗
2026-01-21Nichtberger StevenPurchase (P)Common Stock45,000USD 2.24USD 100,800SEC filing ↗
2026-01-21Gerard MichaelPurchase (P)Common Stock6,600USD 2.27USD 14,982SEC filing ↗
2026-01-21Gavel StevePurchase (P)Common Stock22,170USD 2.27USD 50,326SEC filing ↗
2026-01-21Chang David J.Purchase (P)Common Stock8,800USD 2.26USD 19,888SEC filing ↗
2026-01-21Bollard CatherinePurchase (P)Common Stock4,405USD 2.27USD 9,999SEC filing ↗
2026-01-21Binder GwendolynPurchase (P)Common Stock11,312USD 2.19USD 24,773SEC 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 · —
TickerCABA
CIK0001759138
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2836 Biological Products, (No Diagnostic Substances)
ExchangeNasdaq

Data coverage

Local Form 4 history50 transaction lines from 2020-12-10 to 2026-01-21
15 P purchase lines · 25 S sale lines · 10 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.