# KEITHLEY INSTRUMENTS INC

KEITHLEY INSTRUMENTS INC is a company headquartered in Solon, OH, United States.

## Company overview

- **Legal name:** KEITHLEY INSTRUMENTS INC
- **Classification:** Company
- **Industry (SIC):** 3825 — Instruments For Meas & Testing of Electricity & Elec Signals
- **Headquarters:** Solon, OH, United States
- **Incorporated in:** OH
- **Fiscal year end:** September 30
- **SEC CIK:** 0000054991

## About

KEITHLEY INSTRUMENTS INC is identified in the retained SEC EDGAR snapshot dated 2026-10-14. Its SEC Central Index Key is 0000054991, and its reported industry is Instruments For Meas & Testing of Electricity & Elec Signals. The retained history contains 12 filings, including 10-K filed on 2010-12-15. 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 10-K — filed 2010-12-15 — period 2010-09-30 — FORM 10-K
- Form 8-K — filed 2010-12-08 — period 2010-12-08 — FORM 8-K
- Form 8-K — filed 2010-11-19 — period 2010-11-19
- Form 8-K — filed 2010-11-16 — period 2010-11-15 — FORM 8-K
- Form 8-K — filed 2010-11-04 — period 2010-11-04
- Form 8-K — filed 2010-10-15 — period 2010-09-29 — FORM 8-K
- Form SC 13D — filed 2010-10-08
- Form SC 13D — filed 2010-10-07 — SCHEDULE 13D
- Form 8-K — filed 2010-09-29 — period 2010-09-29 — FORM 8-K
- Form 8-K — filed 2010-08-13 — period 2010-08-09 — FORM 8-K
- Form 10-Q — filed 2010-08-09 — period 2010-06-30 — FORM 10-Q
- Form 8-K — filed 2010-07-28 — period 2010-07-28

---

Updated: 2026-10-23T22:19:15Z

Canonical page: https://altss.com/profile/keithley-instruments-inc

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