★ BEST INVESTING TOOLS COMPARISON ★
VOL. XCIV, NO. 247
Tool details checked August 23, 2026
Tool Comparison
AUM 13F vs InsideArbitrage
Pick AUM 13F instead if
AUM 13F
Free • From $29/mo · Web
- You want the cheaper way in: plans start at $29/mo instead of $100/mo
- You care about improved filings, something InsideArbitrage doesn't offer
Start here
InsideArbitrage
Free • From $100/mo · Web
- You care about news, calendar, and corporate actions & special situations, things AUM 13F doesn't offer
- You're newer to investing and want something approachable
Skip both if: Neither one clicks with how you research; there are strong third options.
See alternativesOutbound links may include affiliate or sponsor codes.
Our take
The bottom line
AUM 13F and InsideArbitrage cover a lot of the same ground (5 shared categories, including institutional ownership, insider data, and watchlist), so for the basics you won't go far wrong with either. InsideArbitrage simply does more: 17 categories to AUM 13F's 6, including news, calendar, and corporate actions & special situations. AUM 13F counters by starting cheaper at $29/mo.
What readers say
AUM 13F
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InsideArbitrage
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Key differences at a glance
- Cheaper paid plan
- AUM 13F$29/mo vs $100/mo
- Broader coverage
- InsideArbitrage17 vs 6 categories
- Asset coverage
- AUM 13FAdds hedge funds and private funds
- Beginner friendly
- InsideArbitrage
- Free plan
- Both
See for yourself
How they stack up
The side-by-side table: pricing, platforms, data, and coverage at a glance.ShowHide
How they stack up
The side-by-side table: pricing, platforms, data, and coverage at a glance.| Attribute | ||
|---|---|---|
| Pricing & plans | ||
Starting price | Free • From $29/mo | Free • From $100/mo |
Free tier | Yes | Yes |
Free trial | — | — |
Plan limits | Free: daily views: Limited (not disclosed) | — |
| Platforms & access | ||
Web app | Yes | Yes |
Mobile app | No | No |
API access | No | No |
Broker sync | — | No |
| Audience & fit | ||
Experience level | Intermediate, Advanced | Beginner, Intermediate, Advanced |
Best for | Institutional Investors and Analysts | — |
Categories covered | 6 | 17 |
Regions | — | — |
| Data & capabilities | ||
Capabilities | — | Universe builder |
| Try it | Visit AUM 13F | Visit InsideArbitrage |
Where each one shines
What AUM 13F and InsideArbitrage each do best.ShowHide
Where each one shines
What AUM 13F and InsideArbitrage each do best.What AUM 13F does best
- Research coverage for asset managers using public filing sources such as EDGAR, IAPD, and CAFR-linked records.
- Browsing access to large-manager AUM rankings, firm profiles, AUM history, AUM breakdowns, and manager-level holdings context.
- Filters for managers by fund type, tags, location, AUM size, and related public-filing attributes.
- Direct access to firm pages that combine AUM data, Form 13F holdings, sector views, and links to underlying filing documents.
- The latest EDGAR filings feed with filing-type filters for 13F, Form D, 8-K, 10-Q, 10-K, insider forms, and other disclosures.
What InsideArbitrage does best
- Track announced mergers, spreads, calendars, deal updates and potential deals.
- Filter news, SEC filings and social posts for premium tracked-deal symbols.
- Research insider activity through transaction pages, weekly articles, cluster-buy screens and insider rankings.
- Follow buybacks, spinoffs, CVRs, tender offers, reverse splits, activist campaigns and management changes.
- Use 13F, 13D, 13G and Form 4 data for institutional and insider ownership context.
Every detail we compared
Every tracked attribute for AUM 13F and InsideArbitrage, side by side.ShowHide
Every detail we compared
Every tracked attribute for AUM 13F and InsideArbitrage, side by side.| Attribute | ||
|---|---|---|
| Coverage & fit | ||
Asset types | StocksETFsHedge FundsPrivate FundsReal EstateFunds | StocksETFs |
Experience | IntermediateAdvanced | BeginnerIntermediateAdvanced |
Target audience | Institutional InvestorsAnalysts | Not specified |
Coverage details | Identifiers: CIK, CUSIP, and Ticker | Identifiers: Ticker and CIK |
| Plans & trust | ||
Capability signals | Not specified | Universe builder |
Vendor & support | Chen Software LLCSupport: Email | InsideArbitrageSupport: Email |
Curation ratings | Not specified | Methodology 3/5Reliability 3/5UX 4/5 |
Green tags are exclusive to that tool in this comparison.
What you'll actually pay
Plans, billing, trials, and per-month pricing for both tools.ShowHide
What you'll actually pay
Plans, billing, trials, and per-month pricing for both tools.| Tier | ||
|---|---|---|
| Free plan | Freedaily views: Limited (not disclosed) | Free“Public Articles and Data” |
| Entry paid plan | $29/mo“Subscription” | $100/mo“Premium - Annual” |
| Top plan | — | $150/mo“Premium - Monthly” |
Questions we keep getting
What's the difference between AUM 13F and InsideArbitrage?
AUM 13F leans toward institutional ownership, insider data, and improved filings, while InsideArbitrage puts more weight on news, alerts, and calendar. They overlap in 5 categories, so for most people it comes down to workflow preference and price.
How much do AUM 13F and InsideArbitrage cost?
Good news: both AUM 13F and InsideArbitrage have free plans, so you can run them side by side and only pay if you hit a wall.
Which is better for beginners: AUM 13F or InsideArbitrage?
InsideArbitrage is the friendlier place to start; its interface takes less getting used to. Both work fine once you're past the basics.
Should I choose AUM 13F or InsideArbitrage?
It depends on what you're after. Pick AUM 13F if improved filings matter to you; go with InsideArbitrage if you'd rather have news and calendar. And if you only need the basics both share, let price decide.
What asset classes do AUM 13F and InsideArbitrage cover?
Both cover stocks and ETFs. AUM 13F also handles hedge funds, private funds, and real estate.
Which has a better stock screener: AUM 13F or InsideArbitrage?
InsideArbitrage has a stock screener for surfacing ideas; AUM 13F doesn't, and focuses its energy elsewhere.
Can I track my portfolio with AUM 13F or InsideArbitrage?
InsideArbitrage handles portfolio tracking. AUM 13F is really a research tool; you'd track your portfolio elsewhere.
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Curation & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.