InsideArbitrage adds News, Alerts, Calendar, Acquisitions, Spin-offs, Buybacks & Authorizations, Dividends, Splits, Insider Data, Institutional Data, 13F, 13D/13G, Regulatory Filings Monitoring, Screeners, Data Visualizations, Portfolio, Watchlist, Blogs, Videos, and PDF Annotation coverage that r/SecurityAnalysis — Letters Wiki skips.
VOL. XCIV, NO. 247
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Friday, October 31, 2025
Tool Comparison
InsideArbitrage vs r/SecurityAnalysis — Letters Wiki comparison
Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.
Quick takeaways
r/SecurityAnalysis — Letters Wiki includes Education, and Forums categories that InsideArbitrage omits.
In depth comparison
InsideArbitrage
insidearbitrage.com
Event‑driven research platform by Asif Suria focused on merger arbitrage, insider transactions, spinoffs, buybacks, activists, and related special situations. Premium includes tools like the Merger Arbitrage Tool, CVR database, buyback & spinoff trackers, premium screens (IA Score, cluster buys, ‘double dipper’), ‘Deals‑in‑the‑Works’ and deal calendars. IA Professional adds pro‑only features (e.g., CVR outcomes, activist tracker, reverse‑splits tracker, Insider Performance Score) and multi‑seat licensing.
Categories
Platforms
Web
Pricing
FreeSubscription
Quick highlights
- Merger Arbitrage Tool with announced‑deal lists, spread tracking, calendars and deal updates; ‘Deals in the Works’ and deal post‑mortems.
- Insider data hub with ‘Insider Weekends’, cluster buys, buys near highs, flip‑floppers, top‑performing insiders and sector heat‑map.
- Buyback suite: daily buyback announcements, searchable buyback history, ‘Buyback Wednesdays’, and ‘Double Dipper’ (insiders + buybacks).
- Spinoff suite: upcoming/completed spinoffs and ‘Spinsider’ screen; CVR deals database with outcomes.
- Gurus/Institutional holdings pages aggregating 13F/13D/13G and Form 4 into manager dashboards.
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r/SecurityAnalysis — Letters Wiki
reddit.com
Community‑maintained directory of investor/fund letters and reports, organized by year/quarter. Publicly viewable; edits limited to approved contributors. Links out to original PDFs/posts on managers’ sites. No data feeds, APIs, or exports—pure research reading list.
Platforms
Web
Pricing
Free
Quick highlights
- Chronological index of letters grouped by year and quarter (2016→present in the wiki).
- Publicly readable wiki page with edit permissions restricted to approved users/moderators.
- ‘Others’ section pointing to classic collections (e.g., Austin Value, Nomad Partnership, Peter Lynch).
- Direct outbound links to the letters on manager sites; useful for primary-source research.
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Where they differ
InsideArbitrage
Distinct strengths include:
- Merger Arbitrage Tool with announced‑deal lists, spread tracking, calendars and deal updates; ‘Deals in the Works’ and deal post‑mortems.
- Insider data hub with ‘Insider Weekends’, cluster buys, buys near highs, flip‑floppers, top‑performing insiders and sector heat‑map.
- Buyback suite: daily buyback announcements, searchable buyback history, ‘Buyback Wednesdays’, and ‘Double Dipper’ (insiders + buybacks).
- Spinoff suite: upcoming/completed spinoffs and ‘Spinsider’ screen; CVR deals database with outcomes.
r/SecurityAnalysis — Letters Wiki
Distinct strengths include:
- Chronological index of letters grouped by year and quarter (2016→present in the wiki).
- Publicly readable wiki page with edit permissions restricted to approved users/moderators.
- ‘Others’ section pointing to classic collections (e.g., Austin Value, Nomad Partnership, Peter Lynch).
- Direct outbound links to the letters on manager sites; useful for primary-source research.
Feature-by-feature breakdown
| Attribute | InsideArbitrage | r/SecurityAnalysis — Letters Wiki |
|---|---|---|
Categories Which research workflows each platform targets | Shared: Newsletters, Playbooks & Case Studies Unique: News, Alerts, Calendar, Acquisitions, Spin-offs, Buybacks & Authorizations, Dividends, Splits, Insider Data, Institutional Data, 13F, 13D/13G, Regulatory Filings Monitoring, Screeners, Data Visualizations, Portfolio, Watchlist, Blogs, Videos, PDF Annotation | Shared: Newsletters, Playbooks & Case Studies Unique: Education, Forums |
Asset types Supported asset classes and universes | Stocks, ETFs | Other |
Experience levels Who each product is built for | Beginner, Intermediate, Advanced | Beginner, Intermediate, Advanced |
Platforms Where you can access the product | Web | Web |
Pricing High-level pricing models | Free, Subscription | Free |
Key features Core capabilities called out by each vendor | Unique
| Unique
|
Tested Verified by hands-on testing inside Find My Moat | Not yet | Not yet |
Editor pick Featured inside curated shortlists | Standard listing | Standard listing |
Frequently Asked Questions
Which workflows do InsideArbitrage and r/SecurityAnalysis — Letters Wiki both support?
Both platforms cover Newsletters, and Playbooks & Case Studies workflows, so you can research those use cases in either tool before digging into the feature differences below.
Do InsideArbitrage and r/SecurityAnalysis — Letters Wiki require subscriptions?
Both InsideArbitrage and r/SecurityAnalysis — Letters Wiki keep freemium access with optional paid upgrades, so you can trial each platform before committing.
How can you access InsideArbitrage and r/SecurityAnalysis — Letters Wiki?
Both InsideArbitrage and r/SecurityAnalysis — Letters Wiki prioritize web or desktop access. Investors wanting a mobile-first workflow may need to rely on responsive web views.
What unique strengths set the two platforms apart?
InsideArbitrage differentiates itself with Merger Arbitrage Tool with announced‑deal lists, spread tracking, calendars and deal updates; ‘Deals in the Works’ and deal post‑mortems., Insider data hub with ‘Insider Weekends’, cluster buys, buys near highs, flip‑floppers, top‑performing insiders and sector heat‑map., and Buyback suite: daily buyback announcements, searchable buyback history, ‘Buyback Wednesdays’, and ‘Double Dipper’ (insiders + buybacks)., whereas r/SecurityAnalysis — Letters Wiki stands out for Chronological index of letters grouped by year and quarter (2016→present in the wiki)., Publicly readable wiki page with edit permissions restricted to approved users/moderators., and ‘Others’ section pointing to classic collections (e.g., Austin Value, Nomad Partnership, Peter Lynch)..
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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.