jefrnc SEC Filing Types
A reference and decision guide for interpreting SEC forms in the context of small-cap and quant research. Most quant code mishandles forms because it treats "a filing exists" as the signal — the form TYPE and SPECIFIC ITEM are the signal.
Core principle
A form's name tells you the company's PERMISSION to do something. The specific item or supplement tells you whether they ACTED on it.
- An effective
S-3means a company can sell shares from the shelf. It does NOT mean they did. - An
S-3plus a recent424B5plus a 10-Q reference to "at-the-market offering" means they ARE selling. That is the dilution signal. - An
8-Kis a sealed envelope until you read its specific items. Item 1.01 is benign or terrifying depending on the agreement.
Always inspect the SPECIFIC item / supplement / amendment, never the form name alone.
Form reference (focused on small-cap dilution context)
Registration and offerings (the dilution machinery)
| Form | What it means | Dilution implication |
|---|---|---|
| S-1 / S-1/A | IPO registration / amendment | New issuer; lockups in effect |
| S-3 | Shelf registration (US issuer) | Permission, not action. Effective shelf = capacity to sell |
| S-3ASR | Automatic shelf (large issuers) | Same as S-3 but no SEC review delay |
| S-8 | Employee plan registration | Adds shares to float as RSUs/options vest |
| F-1 / F-3 | Foreign issuer equivalents of S-1 / S-3 | Same logic, FPI |
| 424B1–424B7 | Prospectus supplement (actual takedown) | THIS is the action. Specifies shares offered, price, agents |
| FWP | Free writing prospectus | Marketing material, often pre-pricing of an offering |
Material events
| Form | Item | Meaning |
|---|---|---|
| 8-K | 1.01 | Material definitive agreement (financing, partnership) — read the agreement |
| 8-K | 1.03 | Bankruptcy / receivership — usually catastrophic |
| 8-K | 2.01 | Completion of acquisition — share issuance possible |
| 8-K | 2.02 | Earnings results |
| 8-K | 3.02 | Unregistered equity sale (private placement / PIPE) — dilution happened |
| 8-K | 3.03 | Modification of rights of holders |
| 8-K | 4.01 / 4.02 | Auditor change / non-reliance on prior financials — red flag |
| 8-K | 5.02 | Officer / director departure or appointment |
| 8-K | 5.07 | Shareholder vote results |
| 8-K | 7.01 | Reg FD disclosure (often offering announcement) |
| 8-K | 8.01 | Other events — read the body |
Periodic reports
| Form | Cadence | Use for |
|---|---|---|
| 10-K | Annual (US issuer) | Cover-page shares outstanding; full disclosures |
| 10-K/A | Annual amendment | Supersedes the original from its own filing date forward |
| 10-Q | Quarterly | Cover-page shares; subsequent-events note critical for offerings |
| 20-F | Annual (FPI) | FPI equivalent of 10-K |
| 6-K | Interim (FPI) | FPI equivalent of 10-Q + 8-K combined |
| NT 10-K / NT 10-Q | Late filing notice | Form 12b-25 — flag for compliance / Nasdaq listing risk |
Ownership
| Form | Filer | Trigger / use |
|---|---|---|
| SC 13D | Beneficial owner >5% (active intent) | Activist or controlling stake |
| SC 13G | Beneficial owner >5% (passive) | Institutional (Vanguard, BlackRock) |
| SC 13D/A, SC 13G/A | Amendments | Material change in holdings or intent |
| 13F | Institutional manager ($100M+) | Quarterly, 45-day lag — never realtime |
| Form 3 | Initial insider statement | First-time officer / director / 10% holder |
| Form 4 | Insider transaction | Buys, sells, option exercises — usually within 2 business days |
| Form 5 | Annual catch-up insider | Transactions exempt from Form 4 |
| Form 144 | Notice of intent to sell restricted shares | Affiliate signaling intent (not always executed) |
Governance & misc
| Form | Use |
|---|---|
| DEF 14A | Proxy statement; record-date share count, exec comp |
| PRE 14A | Preliminary proxy |
| DEFA14A | Additional proxy materials |
| CORRESP, UPLOAD | SEC correspondence (letters, comment-letter responses) |
Decision rules small-cap-relevant
"Is this company actively diluting?" Need (a) effective S-3/F-3 + (b) 424B in the last ~30 days OR 8-K item 3.02 + (c) low cash runway in last 10-Q. All three together = active dilution. Just an S-3 = capacity only.
"Is the offering toxic structure?" Look at the 424B for: warrants attached, pricing at discount to market, placement agent identity (see
bank-tier-classification), ELOC / equity line language, "best efforts" vs "firm commitment"."Should I trust the latest 10-K numbers?" Check for any 10-K/A filed AFTER the 10-K. The amendment supersedes from its own filing_date forward (see
lookahead-safety)."Does this 8-K matter?" Items 1.01, 1.03, 3.02, 4.01, 4.02, 5.02 require reading the body. Item 2.02 (earnings) is routine. Item 7.01 is often a heads-up of a pending offering — pair with same-day or next-day 424B watch.
"Is this insider buying or selling?" Form 4 transaction codes: P (open-market purchase) and S (open-market sale) matter most. A (grant), M (option exercise), F (tax withhold) are noise for sentiment.
"Late filing — should I care?" NT 10-K / NT 10-Q triggers a 15-day extension (5 for 10-Q). Failure to file by the extension creates Nasdaq compliance risk and is a short-side signal for very small companies.
Common confusions
- S-1 vs S-3. S-1 is for new issuers / first registrations. S-3 is for established issuers raising via a shelf. Confusing these mis-frames the company's stage.
- "Effective" vs "filed". S-3 has both: SEC declares effective some weeks after filing. Until effective, no takedown is possible.
- 424B variants. B1–B7 differ in WHAT is being supplemented. B5 is the most common for small-cap shelf takedowns; B2 for IPO-related; B4 for FPIs. The variant matters for parsing but all are takedowns.
- 13D vs 13G. Same threshold (>5%), different intent. 13D = active, 13G = passive. A 13G → 13D conversion is a strong signal.
- 6-K is not 8-K. FPIs have no 8-K; material events flow through 6-K. Don't filter for "8-K" on FPIs — you'll miss everything.
- Form 144 ≠ Form 4. 144 is intent to sell restricted shares; the actual sale (if it happens) appears later as a Form 4. Treating 144 as an executed sale is a common quant bug.
Workflow when analyzing a filing list
- Bucket filings by category (registration, periodic, event, ownership).
- For 8-Ks, immediately partition by item number — don't treat them as a single bucket.
- For each registration form, find the corresponding takedown (424B / 8-K item 3.02 / S-8 effective date) — registration without takedown is capacity, not action.
- For amendments (10-K/A, S-3/A, etc.), apply lookahead-safety: the amendment is known only from ITS filing date.
- For ownership filings, dedupe joint filers and treat 13F with the 45-day lag explicitly.
Phrases that should trigger this skill
- "what does an 8-K item X mean"
- "is an S-3 a dilution event"
- "should I worry about this 424B"
- "13D vs 13G"
- "explain this filing"
- any specific form name: S-1, S-3, 424B5, 8-K, 10-K, 20-F, 6-K, 13D, 13G, 13F, Form 4, NT 10-K, DEF 14A
- "EDGAR" + analysis
- "is this company diluting"
What this skill is NOT
This is not a parser or extractor. It does not pull values from filings.
It tells you what each form / item / amendment MEANS so the LLM can
reason correctly about the data once it's pulled. Combine with
lookahead-safety for time semantics, and (when available)
atm-detection and bank-tier-classification for dilution-specific
inference.