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CMPX · Compass Therapeutics, Inc.

Healthcare · −4.1% on Oct 16

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Updated Oct 17 · 9 feeds behind: FDA drug approvals, 2 days, and 8 more · Every feed →

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The market view

Price chart

The interactive CMPX chart (by TradingView) loads here.

Our take

None of our tested rules has picked CMPX yet.

The 0–100 score for CMPX
Members see one number for how strongly these rules agree on CMPX, and the day each rule fired. Better-tested rules count more, and so do different kinds of filings that point the same way.
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Compare with this company’s history

Is disclosure activity unusual?

See how many different insiders or members of Congress reported purchases or sales of CMPX. Each bar covers 28 days, by disclosure date. Several trades by one person count once in each group and period.

Latest period: Sep 22, 2026–Oct 19, 2026 · UTC dates · today is excluded

Insider purchases

Short history

Only 0 earlier periods are on file to compare with. We need at least 6 full periods before calling a count unusual.

Latest 28 days
1
Earlier median
—
Earlier range
—
Distinct filers per 28 daysScale: 0–1
Oct 21, 2025Oct 19, 2026
Earlier periodsLatest 28 daysLimited or missing history

Who appears in the latest period?

Up to three filers; one example disclosure each.

Inspect this period’s filings

The history behind this view

First stored company disclosure: Sep 25, 2026. Newest disclosure across this feed: Oct 16, 2026.

Earlier periods in the comparison: 0. Outlined periods are missing data, so they are left out of the comparison. The chart scale changes with the category.

Exact counts, dates and filings for all four categories
Insider purchases · Short history

Only 0 earlier periods are on file to compare with. We need at least 6 full periods before calling a count unusual. Earlier median: —; range: unavailable.

Insider purchases: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 21, 2025–Nov 17, 2025—Unavailable
Nov 18, 2025–Dec 15, 2025—Unavailable
Dec 16, 2025–Jan 12, 2026—Unavailable
Jan 13, 2026–Feb 9, 2026—Unavailable
Feb 10, 2026–Mar 9, 2026—Unavailable
Mar 10, 2026–Apr 6, 2026—Unavailable
Apr 7, 2026–May 4, 2026—Unavailable
May 5, 2026–Jun 1, 2026—Unavailable
Jun 2, 2026–Jun 29, 2026—Unavailable
Jun 30, 2026–Jul 27, 2026—Unavailable
Jul 28, 2026–Aug 24, 2026—Unavailable
Aug 25, 2026–Sep 21, 2026—Unavailable
Sep 22, 2026–Oct 19, 2026Latest period1Partial; excluded
Insider sales · Short history

Only 0 earlier periods are on file to compare with. We need at least 6 full periods before calling a count unusual. Earlier median: —; range: unavailable.

Insider sales: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 21, 2025–Nov 17, 2025—Unavailable
Nov 18, 2025–Dec 15, 2025—Unavailable
Dec 16, 2025–Jan 12, 2026—Unavailable
Jan 13, 2026–Feb 9, 2026—Unavailable
Feb 10, 2026–Mar 9, 2026—Unavailable
Mar 10, 2026–Apr 6, 2026—Unavailable
Apr 7, 2026–May 4, 2026—Unavailable
May 5, 2026–Jun 1, 2026—Unavailable
Jun 2, 2026–Jun 29, 2026—Unavailable
Jun 30, 2026–Jul 27, 2026—Unavailable
Jul 28, 2026–Aug 24, 2026—Unavailable
Aug 25, 2026–Sep 21, 2026—Unavailable
Sep 22, 2026–Oct 19, 2026Latest period0Partial; excluded
Congress purchases · History unavailable

No completed-period disclosures for this company are available in this source. Missing history is not zero activity. Earlier median: —; range: unavailable.

Congress purchases: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 21, 2025–Nov 17, 2025—Unavailable
Nov 18, 2025–Dec 15, 2025—Unavailable
Dec 16, 2025–Jan 12, 2026—Unavailable
Jan 13, 2026–Feb 9, 2026—Unavailable
Feb 10, 2026–Mar 9, 2026—Unavailable
Mar 10, 2026–Apr 6, 2026—Unavailable
Apr 7, 2026–May 4, 2026—Unavailable
May 5, 2026–Jun 1, 2026—Unavailable
Jun 2, 2026–Jun 29, 2026—Unavailable
Jun 30, 2026–Jul 27, 2026—Unavailable
Jul 28, 2026–Aug 24, 2026—Unavailable
Aug 25, 2026–Sep 21, 2026—Unavailable
Sep 22, 2026–Oct 19, 2026Latest period—Unavailable
Congress sales · History unavailable

No completed-period disclosures for this company are available in this source. Missing history is not zero activity. Earlier median: —; range: unavailable.

Congress sales: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 21, 2025–Nov 17, 2025—Unavailable
Nov 18, 2025–Dec 15, 2025—Unavailable
Dec 16, 2025–Jan 12, 2026—Unavailable
Jan 13, 2026–Feb 9, 2026—Unavailable
Feb 10, 2026–Mar 9, 2026—Unavailable
Mar 10, 2026–Apr 6, 2026—Unavailable
Apr 7, 2026–May 4, 2026—Unavailable
May 5, 2026–Jun 1, 2026—Unavailable
Jun 2, 2026–Jun 29, 2026—Unavailable
Jun 30, 2026–Jul 27, 2026—Unavailable
Jul 28, 2026–Aug 24, 2026—Unavailable
Aug 25, 2026–Sep 21, 2026—Unavailable
Sep 22, 2026–Oct 19, 2026Latest period—Unavailable
How to read this comparison

The median is the middle count in up to 12 earlier, non-overlapping 28-day periods; the range runs from the smallest to the largest count. The latest period is excluded from both. A comparison needs at least 6 earlier periods, including 3 with activity. The feed’s latest disclosure must be within 7 days of the current period’s end. This freshness check does not verify complete collection.

Insiders include individuals and reporting entities; only purchase and sale codes enter this view. Congress counts reporting members, including their disclosed family transactions. The same filer can appear in purchases and sales, so these categories should not be added into a net count.

These are stored disclosures, not a complete measure of trading. Reporting delays and collection gaps can change the comparison. More activity does not identify a motive or predict a stock’s return.

Company timeline

What has been happening?

May 1, 2026–Oct 16, 2026. Select a month in a category to inspect its records.

Company filings

Insiders

FDA & trials

Owners & lobbying

Insiders · Oct 2026

  1. Disclosed
    Neil Lerner · Purchase

    Transaction dated Oct 1, 2026

All 9 records in this snapshot
  1. Disclosed
    Neil Lerner · Purchase

    Transaction dated Oct 1, 2026

  2. Disclosed
    Neil Lerner · Purchase

    Transaction dated Sep 24, 2026

  3. Filed
  4. Filed
  5. Filed
  6. Filed
  7. Filed
  8. Filed
  9. Record date

Month counts include every record on file. The lists show the newest records on this page. A dash means none on file that month. Trades use disclosure dates; contract dates follow the source record. Nearby events do not establish the cause of a price move.

Who's buying and selling · last 90 days

Congress

No Congress trades on CMPX disclosed in the last 90 days.

See every Congress trade on CMPX →

Company insiders

2 buys · 0 sells · $21.3K bought

  1. ▲ BUYNeil Lerner Chief Accounting OfficerCMPX Compass Therapeutics, Inc.$18.4Kdisclosed Oct 2 · filed 1 day after the trade
  2. ▲ BUYNeil Lerner Chief Accounting OfficerCMPX Compass Therapeutics, Inc.$2.9Kdisclosed Sep 25 · filed 1 day after the trade
See every insider trade on CMPX →

Big holders (Schedule 13D / 13G): 1 filing in the last 90 days · newest: State Street Corp (13G), Aug 7, 2026 ↗

Filings & events

Company filings (8-K) 46

Events the company must report to the SEC within days — results, deals, departures, restatements.

What it files 8-Ks about

  • Quarterly or yearly results · item 2.0211
  • Shared information with investors · item 7.017
  • Shareholder vote results · item 5.074
  • Other events · item 8.014
  • Directors or officers joined, left or got new pay · item 5.022
  • Signed a major agreement · item 1.011

Filing red flags 27

Warning signs in the company's own SEC filings — going-concern doubts, control weaknesses, staff comment letters, late filings, restatements, Wells notices, clinical holds, dividend cuts.

FDA and clinical trials 1

Drug approvals, recalls, clinical-trial updates and FDA advisory meetings.

Lobbying 2

Lobbying reports filed with the Senate for the company.

$80K across 2 reports

Issues named in the most reports

  • Health Issues 2

Planned insider sales (Form 144) 2

Notices insiders file before they sell certain shares, such as ones they got straight from the company.

None in the last 90 days · 2 notices on file

The notices on file don't give the sale's size; each sale shows up under company insiders once it is reported.

5% owners (13D / 13G) 11

Investors who reported owning 5% or more — 13D for owners who may push for changes, 13G for owners who just hold.

Push for changes, or just hold?

  • 13D, may push for changes: 3 filings
  • 13G, just holds: 8 filings

Filed most: BlackRock, Inc. (2) · Orbimed Advisors LLC (2) · State Street Corp (1) · Vivo Opportunity Fund Holdings, L.P. (1)

Biggest named funds (13F)

The largest CMPX holdings among the well-known funds whose quarterly 13F filings we read — opens here.

Every disclosed trade on CMPX

  1. ▲ BUYNeil Lerner Chief Accounting OfficerCMPX Compass Therapeutics, Inc.$18.4Kdisclosed Oct 2 · filed 1 day after the trade
  2. ▲ BUYNeil Lerner Chief Accounting OfficerCMPX Compass Therapeutics, Inc.$2.9Kdisclosed Sep 25 · filed 1 day after the trade
See the trades on CMPX in the feed →
People & votes

Which members of Congress traded CMPX, sponsored bills that touch it and voted on them — opens here.