SEC Filings Cheat Sheet

How to Use This Page

• Don’t assume direction: many filings are procedural. Confirm with offering terms, float context, and price/volume.
• Primary vs. resale matters: primary raises can add new shares; resale often registers existing or underlying shares.
• Look for the linked file number: many updates (amendments, EFFECT, supplements) connect back to a prior registration statement.

Registration Statements & Offerings

S-1 / F-1

• Used for: IPO registration, some follow-on offerings, or resale registration (varies by deal structure).
• When it appears: IPOs can be months in advance; follow-ons often closer to pricing; resale can be filed any time (sometimes required by registration rights).
• How to recognize: the cover and summary will describe the transaction; resale versions list selling shareholders and specific share counts.
• Typical immediate impact: ranges from none to medium (highest when it signals a discounted near-term raise).
• Examples:
  • IPO-style S-1: SEC example
  • Follow-on style: SEC example
  • Resale-style: SEC example

S-1 / F-1 Amendments (S-1/A, F-1/A)

• Used for: updating or completing a prior S-1/F-1 (additional disclosures, exhibits, updated terms).
• When it appears: after the initial filing, often during SEC review.
• How to recognize: “Amendment” on the cover; check the file number to see the base registration statement.
• Typical immediate impact: usually none (unless it contains meaningful new deal terms).
• Example: SEC example

EFFECT

• Used for: the SEC declaring a registration statement effective.
• When it appears: commonly weeks after filing, but timing varies by issuer complexity and review.
• How to recognize: “EFFECT” with a linked file number.
• Typical immediate impact: low to medium (bigger when the market expects near-term pricing after an S-1).
• Example: SEC example

S-1MEF / F-1MEF (MEF “upsizing”)

• Used for: registering an additional amount above a prior S-1/F-1 (often a limited % increase, depending on rules and deal structure).
• When it appears: near the end of the process—often after effectiveness and close to pricing.
• How to recognize: “MEF” and a reference to the original file number.
• Typical immediate impact: low to medium (can hint pricing is close).
• Example: SEC example

424B4 (Final prospectus for IPO / S-1 priced deal)

• Used for: posting final pricing details after an IPO or S-1/F-1 offering is priced.
• When it appears: after pricing is announced.
• How to recognize: prospectus supplement linked to the same file number.
• Typical immediate impact: usually none (terms are typically known via press release first).
• Example: SEC example

Shelf Registrations & ATMs

S-3 / F-3 / F-10 (Shelf registration)

• Used for: registering a maximum dollar amount of securities the company may offer over a period (commonly up to three years).
• When it appears: when a company wants fundraising flexibility.
• How to recognize: a max dollar amount and a list of eligible security types.
• Typical immediate impact: none to low (usually not usable until effective; exceptions exist for certain issuers).
• Example: SEC example
• Resale variant example: SEC example

S-3MEF / F-3MEF (Shelf “upsizing”)

• Used for: adding incremental capacity to an already-effective shelf (often used when planning near-term usage).
• When it appears: after the shelf is effective.
• How to recognize: “MEF” + references to the base shelf file number.
• Typical immediate impact: low to medium (can be interpreted as a signal the shelf may be used soon).
• Example: SEC example

S-3ASR / F-3ASR (Automatic shelf registration)

• Used for: immediate shelf effectiveness for eligible large issuers (automatic effectiveness on filing for qualified issuers).
• When it appears: when an issuer qualifies for ASR status.
• How to recognize: “ASR,” often with flexible/blank capacity language (unless an ATM is included).
• Typical immediate impact: none to low unless followed quickly by an offering.
• Examples:
  • SEC example
  • SEC example

424B5 (ATM / prospectus supplement)

• Used for: “at-the-market” programs and certain shelf supplements (also sometimes used to register underlying shares for warrants/convertibles).
• When it appears: after shelf effectiveness; can be filed proactively.
• How to recognize: mentions “at-the-market,” “equity distribution,” or a maximum program size.
• Typical immediate impact: none to medium (depends on whether the market believes immediate selling is likely).
• Examples:
  • ATM example: SEC example
  • Post-pricing supplement example: SEC example
  • Underlying shares example: SEC example

424B3 (Resale prospectus after effectiveness)

• Used for: a prospectus used once a resale registration becomes effective, enabling registered resales per the prospectus.
• When it appears: after the underlying resale registration is effective.
• How to recognize: cover page closely mirrors the earlier resale registration.
• Typical immediate impact: none to low, but unlock dynamics can matter over time.
• Examples:
  • Resale 424B3: SEC example
  • Amended 424B3 example: SEC example

RW (Withdrawal)

• Used for: pulling back a previously filed registration statement.
• When it appears: any time after the initial filing if the issuer decides not to proceed.
• How to recognize: “RW” with a linked file number.
• Typical immediate impact: low to medium (can be positive if the market expected a near-term raise that is now cancelled).
• Example: SEC example

Financial Reports

10-Q (Quarterly report)

• Used for: quarterly financial statements and updates.
• When it appears: after quarter end, typically after an earnings release.
• How to recognize: standard 10-Q format with MD&A, financials, and risk factors updates.
• Typical immediate impact: usually none to low unless it precedes earnings or contains a surprise.
• Example: SEC example

10-K (Annual report)

• Used for: annual audited financials + comprehensive risk and business disclosure.
• When it appears: after fiscal year end, typically after earnings.
• How to recognize: 10-K with audited statements and expanded risk factors.
• Typical immediate impact: usually none to low unless it reveals something unexpected.
• Example: SEC example

20-F / 40-F (Foreign issuer annual reports)

• 20-F: annual report for many non-U.S. issuers. Example
• 40-F: annual report option for certain Canadian issuers. Example
• Typical immediate impact: usually none to low unless the market hasn’t seen the info elsewhere.

Material Event Disclosures

8-K (U.S. issuer material events)

• Used for: reporting significant events (financings, agreements, leadership changes, M&A, listing issues, restructurings, and more).
• When it appears: generally within days of a triggering event.
• How to recognize: “Item” sections that identify the event type; exhibits may contain the press release or key contracts.
• Typical immediate impact: none to high (depends on the event’s importance and whether the filing is the first public disclosure).
• Example: SEC example

6-K (Foreign issuer material updates)

• Used for: reporting significant updates for many foreign private issuers.
• When it appears: “promptly” after an event (timing varies).
• How to recognize: narrative disclosure and exhibits; often includes press releases.
• Typical immediate impact: none to high (depends on the event and whether it’s new to the market).
• Example: SEC example

Ownership & Insider Activity

Schedule 13D / 13G (5%+ ownership)

• 13D: often associated with active/activist intent; can include purpose and plans. Example
• 13G: generally used for passive ownership reporting (varies by filer type). Example

13D/A / 13G/A (Amendments)

• Used for: changes in ownership and (for 13D) sometimes changes in intent/purpose.
• Examples:
  • 13D/A: SEC example
  • 13G/A: SEC example

Forms 3 / 4 / 5 (Insider filings)

• Form 3: initial insider registration. Example
• Form 4: insider transactions (buys/sells/awards) typically reported quickly. Example
• Form 5: annual catch-up for certain reportable transactions not previously filed. Example
• Typical immediate impact: often low to medium; higher when a meaningful insider buy/sell is clearly discretionary.

Proxies & Shareholder Votes

PRE 14A (Preliminary proxy)

• Used for: an early version of a proxy statement, often ahead of a special meeting.
• How to recognize: marked as “preliminary” and outlines proposals to be voted on.
• Example: SEC example

DEF 14A (Definitive proxy)

• Used for: the final proxy statement (annual meeting or other votes).
• Example: SEC example

DEFM14A (Merger-related proxy)

• Used for: shareholder materials for a merger vote.
• Example: SEC example

PREC14A / PRRN14A / DFAN14A (Contested situations)

• Used for: additional proxy materials in contested votes / activist campaigns.
• Example: SEC example

Other Forms You’ll See

S-4 / F-4 (Merger share registration)

• Used for: registering shares issued in a business combination or exchange offer.
• Example: SEC example

425 (Additional merger communications)

• Used for: extra written communications related to a transaction (often aligned with an 8-K narrative).
• Example: SEC example

1-A (Regulation A offering)

• Used for: a public fundraising path under Regulation A.
• Example: SEC example

Reg A reporting: 1-U / 1-K / 1-SA

• Used for: Reg A ongoing reports (event updates, annual, and semi-annual).

13F-HR (Institutional holdings)

• Used for: quarterly holdings disclosure for managers over the reporting threshold.
• Example: SEC example

S-8 (Employee plan registration)

• Used for: registering shares/options for employee benefit plans.
• Typical immediate impact: usually none (often gradual issuance/sales).
• Example: SEC example

Quick Interpretation Checklist

1. Identify the purpose: capital raise vs. resale vs. administrative update.
2. Check the security: common stock, warrants, convertibles, preferred, debt.
3. Compare size vs. float and volume: unlock size can matter more than the headline number.
4. Trace the file number: amendments, EFFECT, and supplements tie back to the original statement.
5. Look for the press release: often attached as an exhibit for the story in plain English.