Best Dilution Trackers in 2026: Six Tools, What They Cost and Where the Numbers Come From

These six tools are built for different jobs. DilutionTracker has manually reviewed dilution data on US small caps under $500 million, and it is the established name. AskEdgar lets you ask plain-English questions of filings. Dilutracker puts an API on its entry plan. DilutionWatch sells low-cost filing alerts across every SEC filer. Signal8 puts dilution data, a premarket scanner and an API in one subscription. And SEC EDGAR plus a calculator costs nothing.

Everything after that is what each vendor says about itself on its own site: price, stated coverage, how the data is produced, API, alerts and free plan. We make Signal8. It sits in alphabetical order with the rest and gets its own section on where it is weaker.

Prices are as listed on each vendor's own pricing page on 2026-10-12. "Not listed" means the vendor's page did not state it when we checked, not that the feature is absent.

Two of these prices match exactly. DilutionTracker Premium billed annually is $588 a year, the same as Signal8 Pro annual, and AskEdgar Pro's $59 a month is what Signal8 Pro costs monthly. So the price tag won't decide it.

Every competitor fact here comes from the vendor's own pricing page, homepage or documentation, checked on 2026-10-12, and each source is listed with its URL and date at the bottom of the page. For each tool we wrote down six things: the price on the pricing page that day, with its billing period; coverage in the vendor's own words (which companies, what size, which exchanges); the data method, meaning how the vendor says its numbers are produced, for example manual review by a team or structured data built from filings; whether the API comes with the base plan or is sold separately; the alerts listed on the plan; and what the vendor's own plan table says the free plan includes.

We did not test the tools against each other on specific tickers, and we did not open paid competitor accounts. A vendor's description of its own product is the fairest common basis we have, and it is the same thing you can check before you pay. Where a page was silent, we say "not listed" rather than guess.

Five things decide whether a tracker's numbers hold up when you trade on them.

1. Which instruments it tracks. A full picture covers ATM programs, shelf registrations and their remaining capacity, warrants (pre-funded ones too), convertible notes and preferred, equity lines, and recent offerings. Our guides on ATM offerings, warrant overhang and toxic convertibles cover why each one matters.

2. Baby-shelf math. A company with a non-affiliate float under $75 million can sell only one-third of that float in 12 months off an S-3 shelf. Show a $100 million shelf without the cap and you overstate what can be sold. The baby shelf guide explains the rule.

3. Split basis. Small caps reverse split often. A warrant count from before a split and a share count from after it don't line up, and that mismatch is a common reason two tools disagree on one company.

4. How it shows what it could not find. A blank or "not measured" where a filing is silent is more careful than a zero. Zero is a claim.

5. Whether you can check the number. If a figure links to the filing it came from, you can verify it in seconds. Whatever you use, the filing has the last word.

We would rather you read this here than find it out on a trade.

• No team reads every filing by hand. DilutionTracker's people-read-every-filing approach is a real difference, and some traders will want it. Consistency checks catch a lot. They are not an experienced trader reading a footnote.
• Snapshots are built on request. If a small cap has no snapshot yet, a Pro user clicks Get dilution data and it is built from the filings, typically in 10 to 90 minutes, with an email when it is ready. Until then, a missing snapshot is not a finding of no dilution. We have not published a count of covered companies, so we don't quote one.
• No fixed daily cutoff. DilutionTracker states a daily 9PM EST target and Dilutracker states 24 hours. Signal8 updates when new filings arrive and lets Pro users regenerate a snapshot on demand (10 to 90 minutes), and flags any snapshot more than a month old with its generation and filing dates, but it has not measured a typical filing-to-display time.
• Same small-cap ceiling. Snapshots stop at companies under $500 million. AskEdgar's stated audited coverage goes to about $1 billion.
• Newer, with less history. DilutionTracker in particular has years of community use behind it.
• No free tier for snapshots. AskEdgar, DilutionTracker and DilutionWatch all have free plans. Signal8's snapshots need Pro.

Short sellers on sub-$500 million names should start with the ATM and shelf rows, then the baby-shelf math. Any of the dilution-first tools covers that universe; cross-check the headroom against the issuer's own I.B.6 paragraph, and see ATM offerings for background.

Momentum longs care most about warrants near the money and recently registered resale shares. Read warrant overhang, and check whether new warrants need stockholder approval before anyone can exercise them.

For overnight holds, a live ATM plus remaining shelf capacity is what can land before the open. The registered direct, PIPE and underwritten guide covers how fast each one can close.

On convertible-heavy issuers, look for variable conversion prices and floors. Toxic convertibles explains the structure, and the convertible conversion calculator gives share counts at different prices.

Watching a wide list on a budget? DilutionWatch's stated coverage of all SEC filers and its low entry price fit an alert-first workflow.

If you build with an API or an agent: Dilutracker includes its API on every plan, AskEdgar and DilutionWatch sell API access separately, and Signal8 includes an API and an MCP server in Pro.

1. Open EDGAR full-text search or the company's filing list, and filter to 424B5, S-3, 8-K and the latest 10-Q. Our EDGAR search guide shows how.
2. In the newest 424B5 or S-3, find the paragraph that starts "Pursuant to General Instruction I.B.6". It states the non-affiliate value and what was already sold in 12 months.
3. Put those two numbers into the baby-shelf calculator.
4. From the latest 10-Q, take cash and quarterly operating cash burn into the cash runway calculator.
5. Before you compare share counts across filings, check for reverse splits in between.

• 2026-10-12: First published.