What is CMPX's short interest?

41,647,512 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.

What percentage of the float is short?

We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.

It is 21 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.

What does days to cover mean?

It is the short position divided by average daily trading volume — here, 15.99. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.

Where does this come from?

FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Ticker

CMPX

Compass Therapeutics, Inc.

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CMPX in the last 90 days

Compass Therapeutics, Inc. (CMPX) had no US House transactions and 2 insider purchases worth $21,250 by 1 insider in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 41,647,512 shares held short, 16.0 days to cover, up 2.1% from the report before.

Insiders: open-market purchases only (Form 4 code P); a purchase filed by related owners counts once.
Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 02 OCT 2026 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the filings show

What the filings show · last 90 days · Quiet Money indicator

2 of 4 sources

+11Balanced

Leaning outBalancedLeaning in

The disclosed money is split, on what has actually been filed. This reads on two of the four sources we track.

Short interest: Short interest rose 6.0% — 39,298,468 to 41,647,512 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →; -15
Insider purchases: 1 insider disclosed buying $21,250 across 2 filings.; +46

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

41,647,512shares held short

Days to cover

15.99

Avg daily volume

2,605,174

Since last report

+2.11%

As of 15 September 2026, 41,647,512 Compass Therapeutics, Inc. shares were held short — the total across every reporting firm, not one fund's position. That is 858,621 shares more than the previous report, a 2.11% increase. At the average daily volume of 2,605,174 shares, that position represents 15.99 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 21 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it seven business days later. So nobody has a live short-interest number for CMPX — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 26,127,480 shares on 31 March 2026 to 41,647,512 today, a change of 59.4%. The highest reading in that window was 41,647,512 shares on 15 September 2026.

Settlement	Shares short	Days to cover
15 SEPT 2026	41,647,512	15.99
31 AUG 2026	40,788,891	17.26
14 AUG 2026	40,197,938	9.78
31 JUL 2026	39,874,250	17.62
15 JUL 2026	39,298,468	15.67
30 JUN 2026	37,138,819	8.89
15 JUN 2026	32,497,225	9.48
29 MAY 2026	33,270,343	6.41
15 MAY 2026	31,022,699	4.07
30 APR 2026	30,416,716	1.35
15 APR 2026	26,068,017	9.43
31 MAR 2026	26,127,480	12.05

What is CMPX's short interest?: 41,647,512 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?: We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?: It is 21 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?: It is the short position divided by average daily trading volume — here, 15.99. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?: FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

$21,250across 2 purchases

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases2

US House transactions0

Latest change02 OCT 2026

SHORT POSITIONS · 0INSIDER BUYS · 2US HOUSE · 0

Insider purchases on file

SEC — Form 4 insider purchase
Lerner NeilChief Accounting Officer
BOUGHTCommon Stock
$18,400
20,000 sh @ $0.92
01 OCT 2026 → filed 02 OCT 2026
Filed 1 day after the tradeSEC EDGAR · 0001171843-26-006349 →
SEC — Form 4 insider purchase
Lerner NeilChief Accounting Officer
BOUGHTCommon Stock
$2,850
2,500 sh @ $1.14
24 SEPT 2026 → filed 25 SEPT 2026
Filed 1 day after the tradeSEC EDGAR · 0001171843-26-006235 →

What this page will never showNo buy or sell ratingsNo price targetsNo forecastsIndicators are rules-based summaries of the filingsDocuments, dates, and how long they took to become public.