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

Annexon, Inc.

ANNX · Nasdaq · CIK 0001528115 · Healthcare · Biotechnology

INSIDER SIGNAL

71.8 / 100

3 buyers · 3 purchase transaction lines · $3.5M gross purchase

WHY THIS SIGNAL?

Buyer breadthModerate
Purchase sizeStrong
RoleModerate
RecencyModerate
ConvictionStrong
Score anatomy

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

Cluster+21.0 / 35
Purchase size+21.1 / 25
Role+13.0 / 20
Recency+6.7 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 3 insider(s), not 4+
  • ⚠ Role scores low · most senior buyer: PRESIDENT AND CEO (CEO, chair and 10% owners score lowest)

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
Yednock TedEVP & CHIEF INNOVATION OFFICER
○
Satter Muneer ADirector
●
Carson William H.Director
●
Love DouglasPRESIDENT AND CEO
●
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS3
PURCHASE CONCENTRATION96%Largest buyer: Satter Muneer A · $3.3M
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-11–2026-05-11

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

SIGNAL HISTORY

71.8 / 100

Latest recorded score

↓ -0.3 ptsversus the previous recorded snapshot
  1. 72.5
  2. 72.4
  3. 72.3
  4. 72.1
  5. 71.8

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

Recent Form 4 activity

14Purchases
10Sales
6Other Form 4 lines
27SEC filings · 365 days
BUYING3 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER1 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 provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-2.9%
3M
-28.6%
6M
-31.3%
12M
+27.6%

Volatility & liquidity

Volatility
76.7%
Beta
—
Avg daily value
USD 12.4M

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
—
ROE
-97.7%
Industry
Biotechnology

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: ROE · Fiscal year ended: 2025-12-31 · Status: PASS

Short interest

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

Shares short
32,009,914
Previous report
32,871,995
Avg daily volume
3,597,520
Days to cover
8.9

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
2026-09-24Love DouglasPurchase (P)Common Stock26,065USD 3.83USD 99,829SEC filing ↗
2026-05-28Satter Muneer APurchase (P)Common Stock613,497USD 5.41USD 3,319,019SEC filing ↗
2026-05-11Carson William H.Purchase (P)Common Stock8,000USD 5.78USD 46,240SEC filing ↗
2026-04-10Carson William H.Purchase (P)Common Stock8,000USD 6.20USD 49,600SEC filing ↗
2026-03-10Carson William H.Purchase (P)Common Stock8,000USD 5.67USD 45,360SEC filing ↗
2025-12-30Carson William H.Purchase (P)Common Stock4,115USD 5.02USD 20,657SEC filing ↗
2025-12-01Choi JungPurchase (P)Common Stock33,000USD 4.19USD 138,270SEC filing ↗
2025-12-01Carson William H.Purchase (P)Common Stock4,115USD 4.47USD 18,394SEC filing ↗
2025-11-21Satter Muneer APurchase (P)Common Stock422,613USD 4.28USD 1,808,784SEC filing ↗
2025-11-20Satter Muneer APurchase (P)Common Stock400,000USD 4.48USD 1,792,000SEC filing ↗
2025-11-19Satter Muneer APurchase (P)Common Stock500,000USD 3.94USD 1,970,000SEC filing ↗
2025-11-18Satter Muneer APurchase (P)Common Stock500,000USD 3.18USD 1,590,000SEC filing ↗
2025-11-17Satter Muneer APurchase (P)Common Stock500,000USD 2.99USD 1,495,000SEC filing ↗
2025-10-30Carson William H.Purchase (P)Common Stock4,115USD 3.17USD 13,045SEC filing ↗
2025-09-30Carson William H.Purchase (P)Common Stock4,115USD 3.05USD 12,551SEC filing ↗

Form 4 evidence

30 transaction lines in the latest 365-day window; 168 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-24Love DouglasPurchase (P)Common Stock26,065USD 3.83USD 99,829SEC filing ↗
2026-06-11Yednock TedOption exercise / conversion (M)Common Stock30,646USD 1.85USD 56,695SEC filing ↗
2026-05-28Satter Muneer APurchase (P)Common Stock613,497USD 5.41USD 3,319,019SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-24Love DouglasPurchase (P)Common Stock26,065USD 3.83USD 99,829SEC filing ↗
2026-06-11Yednock TedOption exercise / conversion (M)Common Stock30,646USD 1.85USD 56,695SEC filing ↗
2026-05-28Satter Muneer APurchase (P)Common Stock613,497USD 5.41USD 3,319,019SEC filing ↗
2026-05-11Carson William H.Purchase (P)Common Stock8,000USD 5.78USD 46,240SEC filing ↗
2026-04-10Carson William H.Purchase (P)Common Stock8,000USD 6.20USD 49,600SEC filing ↗
2026-03-10Carson William H.Purchase (P)Common Stock8,000USD 5.67USD 45,360SEC filing ↗
2026-03-02Yednock TedSale (S)Common Stock5,566USD 5.42USD 30,168SEC filing ↗
2026-03-02Overdorf MichaelSale (S)Common Stock4,339USD 5.42USD 23,517SEC filing ↗
2026-03-02Lew JenniferSale (S)Common Stock5,565USD 5.42USD 30,162SEC filing ↗
2026-03-02Dananberg JamieSale (S)Common Stock5,820USD 5.43USD 31,603SEC filing ↗
2026-03-02ARTIS DEAN RICHARDSale (S)Common Stock5,894USD 5.43USD 32,004SEC filing ↗
2026-02-19Yednock TedAward / grant (A)Common Stock62,500USD 0.00USD 0SEC filing ↗
2026-02-19Overdorf MichaelAward / grant (A)Common Stock62,500USD 0.00USD 0SEC filing ↗
2026-02-19Lew JenniferAward / grant (A)Common Stock62,500USD 0.00USD 0SEC filing ↗
2026-02-19Dananberg JamieAward / grant (A)Common Stock56,250USD 0.00USD 0SEC filing ↗
2026-02-19ARTIS DEAN RICHARDAward / grant (A)Common Stock62,500USD 0.00USD 0SEC filing ↗
2026-02-18Yednock TedSale (S)Common Stock7,857USD 5.11USD 40,149SEC filing ↗
2026-02-18Overdorf MichaelSale (S)Common Stock6,225USD 5.10USD 31,747SEC filing ↗
2026-02-18Lew JenniferSale (S)Common Stock7,851USD 5.11USD 40,119SEC filing ↗
2026-02-18Dananberg JamieSale (S)Common Stock5,290USD 5.10USD 26,979SEC filing ↗
2026-02-18ARTIS DEAN RICHARDSale (S)Common Stock5,290USD 5.10USD 26,979SEC filing ↗
2025-12-30Carson William H.Purchase (P)Common Stock4,115USD 5.02USD 20,657SEC filing ↗
2025-12-01Choi JungPurchase (P)Common Stock33,000USD 4.19USD 138,270SEC filing ↗
2025-12-01Carson William H.Purchase (P)Common Stock4,115USD 4.47USD 18,394SEC filing ↗
2025-11-21Satter Muneer APurchase (P)Common Stock422,613USD 4.28USD 1,808,784SEC filing ↗
2025-11-20Satter Muneer APurchase (P)Common Stock400,000USD 4.48USD 1,792,000SEC filing ↗
2025-11-19Satter Muneer APurchase (P)Common Stock500,000USD 3.94USD 1,970,000SEC filing ↗
2025-11-18Satter Muneer APurchase (P)Common Stock500,000USD 3.18USD 1,590,000SEC filing ↗
2025-11-17Satter Muneer APurchase (P)Common Stock500,000USD 2.99USD 1,495,000SEC filing ↗
2025-10-30Carson William H.Purchase (P)Common Stock4,115USD 3.17USD 13,045SEC 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 · —
TickerANNX
CIK0001528115
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history168 transaction lines from 2020-07-28 to 2026-09-24
36 P purchase lines · 70 S sale lines · 62 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.