# SUMMA FOUR INC

SUMMA FOUR INC is a company headquartered in Manchester, NH, United States.

## Company overview

- **Legal name:** SUMMA FOUR INC
- **Classification:** Company
- **Industry (SIC):** 3661 — Telephone & Telegraph Apparatus
- **Headquarters:** Manchester, NH, United States
- **Incorporated in:** DE
- **Fiscal year end:** March 31
- **SEC CIK:** 0000900095

## About

SUMMA FOUR INC is identified in the retained SEC EDGAR snapshot dated 2026-10-14. Its SEC Central Index Key is 0000900095, and its reported industry is Telephone & Telegraph Apparatus. The retained history contains 12 filings, including SC 13D filed on 1998-10-08. Each filing retains its accession, filing date and original SEC document link. This historical evidence does not establish current registration, listing, ownership or financial condition.

## Recent SEC filings

- Form SC 13D — filed 1998-10-08
- Form 10-Q — filed 1998-08-14 — period 1998-06-30 — SUMMA FOUR, LTD.
- Form 8-K — filed 1998-07-30 — period 1998-07-27 — SUMMA FOUR, INC.
- Form DEF 14A — filed 1998-06-26 — period 1998-07-27 — SUMMA FOUR, INC.
- Form 10-K — filed 1998-06-22 — period 1998-03-31 — SUMMA FOUR, INC.
- Form 10-K/A — filed 1998-06-19 — period 1994-03-31 — SUMMA FOUR, INC. AMENDMENT NO.2 FOR 31-MAR-1994
- Form 10-K/A — filed 1998-06-19 — period 1997-03-31 — SUMMA FOUR, INC. 3/31/97 AMENDMENT NO. 1
- Form 10-K/A — filed 1998-06-19 — period 1996-03-31 — SUMMA FOUR, INC. 3/3/96 AMENDMENT NO. 1
- Form 8-K — filed 1998-06-02 — period 1998-06-02 — SUMMA FOUR
- Form SC 13G — filed 1998-02-13 — SCHEDULE 13G
- Form 10-Q — filed 1998-02-12 — period 1997-12-31 — SUMMA FOUR, INC.
- Form SC 13G — filed 1998-02-10 — 1997 SCHEDULE 13G - SUMMA FOUR INC

---

Updated: 2026-10-23T22:24:09Z

Canonical page: https://altss.com/profile/summa-four-inc

Maintained by Altss — https://altss.com — methodology: https://altss.com/methodology