KZST

Local Radio Broadcastingkzst.com

KZST is a commercial FM radio station broadcasting at 100.1 FM in Santa Rosa, California, serving Sonoma County and the North Bay region. Owned by Amaturo Sonoma Media Group, it monetizes through local advertising sales and sponsorships to community businesses.

Company typePrivate
Founded1971
HeadquartersSanta Rosa, United States
Headcount51–100
GTM typeB2B
OfferingServices

What KZST does

KZST is a commercial FM radio station operating at 100.1 FM in Santa Rosa, California, serving the Sonoma County and North Bay region. Founded in 1971, the station is owned and operated by Amaturo Sonoma Media Group, LLC (ASMG), a privately held local media group that also owns KSRO, KFGY, KVRV, KHTH, KWVF, KJZY, and the North Bay Biz Magazine. KZST delivers an adult contemporary music format alongside hyper-local content including Sonoma County news, weather, CHP traffic reports, gas prices, community events, and local sports coverage, with on-air personalities such as Stacey K & Jonah, Mike Adams, Delilah, and Natalie.

The station's technology stack is built around traditional FM broadcast transmission at 100.1 FM, supplemented by digital streaming via StreamGuys (a third-party streaming and podcasting provider) and a proprietary KZST mobile application. Distribution extends beyond over-the-air to web streaming, the mobile app, and smart home integration via Alexa and Google Home. Audience engagement is sustained through Facebook, Instagram, X (Twitter), and a VIP Text Club SMS program, with community initiatives such as Hometown Hero, Random Acts of Kindness, Teacher of the Month, and a community events calendar.

Revenue is generated almost exclusively through on-air advertising sales and sponsorships sold to local businesses and advertisers in the North Bay market. The station operates under a sales-led go-to-market model, with no publicly disclosed pricing or programmatic ad platform. KZST does not have a public-facing API, SDK, or developer ecosystem, and there is no documented AI/ML capability. Operating geographies are limited to a single domestic market (Sonoma County / North Bay), and the company is privately held with no venture capital or public investment.

KZST firmographics

Firmographics

Name: KZST
Legal name: Amaturo Sonoma Media Group, LLC
Website: https://kzst.com
Company type: Private
Founded year: 1971
Operating status: Operating
Headcount range: 51–100 employees
Short description: KZST is a commercial FM radio station broadcasting at 100.1 FM in Santa Rosa, California, serving Sonoma County and the North Bay region. Owned by Amaturo Sonoma Media Group, it monetizes through local advertising sales and sponsorships to community businesses.
Ownership category
akta.pro rank

KZST industry classification

Industry

Product category: Local Radio Broadcasting
NAICS: Radio Broadcasting Stations (51611)
SIC: Radio Broadcasting Stations (4832)
akta.pro industry: PRIMARYMPABACAD
Independent Local Radio Stations
Media, Entertainment & Sports/Broadcasting (TV & Radio)/Local Broadcast Stations & Affiliates (TV & Radio)
SECONDARYMPAIADAJ
Radio Streaming & Catch-Up Audio Platforms
Media, Entertainment & Sports/Music & Audio (Recording, Publishing, Streaming)/Audio Streaming & Podcast Platforms
SECONDARYMPAIAEAE
Internet Radio & Streaming Broadcast Stations (Simulcast/Online-only)
Media, Entertainment & Sports/Music & Audio (Recording, Publishing, Streaming)/Radio & Audio Broadcasting (Terrestrial, Satellite, Digital Radio)

Keywords

FM radio broadcasting
Local radio station
Radio advertising sales
Music programming
Community news content

Where KZST is headquartered

Location

Headquarters

HQ city: Santa Rosa
HQ country: United States
HQ region: North America

Offices1 record

Markets served

KZST business model

Business model

GTM type: B2B
Offering type: Services
Cost components: Personnel, Operations, Marketing or Sales, Technology or R&D, Others

Revenue model

Advertising & Sponsorships: KZST generates revenue through the sale of on-air advertising spots, sponsorships, and promotional packages to local businesses and advertisers in the North Bay/Sonoma County market. The station offers various advertising formats and branded content opportunities tied to its shows and programming.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

KZST product offering

Product offering

Core offering

KZST is a commercial FM radio station broadcasting adult contemporary music at 100.1 FM from Santa Rosa, California, owned by Amaturo Sonoma Media Group. The station combines on-air music programming and syndicated shows with locally produced news, weather, traffic, gas-price, PG&E outage, and community-event content targeted at Sonoma County and the broader North Bay audience. Revenue is generated primarily by selling on-air advertising spots, sponsorships, and branded-content packages to local businesses across the North Bay region.

Product overview

KZST 100.1 is a traditional broadcast radio station operating as part of the Amaturo Sonoma Media Group portfolio. The station's offering is centered on its FM broadcast signal combined with a digital streaming platform (powered by StreamGuys) and a mobile application. Content includes locally produced radio shows, syndicated programming (Delilah), local news aggregation, weather, traffic reports, community events calendars, and entertainment news coverage. The station is monetized through advertising and does not operate a modular SaaS or platform architecture.

Differentiator

Problem solved

Functional benefit

Products and services

KZST 100.1 Radio Station

Companies that use KZST

Customer profile

Segments1 record

Ideal customer profiles2 records

KZST technology and API

Technology

Technology focussed No

API detail

Has API: No
API docs
API detail

Core technology

AI maturity

App detail

Integration1 record

Feature1 record

KZST partnerships and signals

Strategic signal

Partnerships

One partnership is on record.

StreamGuyscoreTechnology or IntegrationStreamGuys serves as KZST's third-party streaming provider, delivering high-quality audio and video streaming services. StreamGuys collects technical data including IP address, browser type, and streaming access logs for operational purposes such as stream optimization and analytics. They do not collect personally identifiable information unless explicitly provided by users and do not sell or share user data with third parties for marketing purposes.

Scale indicators1 record

Recent moves5 records

Expansion highlights5 records

KZST competitors and assessment

Company assessment

Direct peers

KFGY 92.9 (Froggy): Country-format radio station co-owned by ASMG in the North Bay market. Same parent, same sales infrastructure, same geographic footprint; differs mainly in music format and demographic targeting.
KSRO 1350 AM: Sister station under the same Amaturo Sonoma Media Group umbrella, also serving the Sonoma County/North Bay market. Directly comparable as a local radio advertiser and shares the same Santa Rosa headquarters, sales team, and back-office infrastructure as KZST.
KVRV 97.7 The River: Adult album alternative station also owned by ASMG in the North Bay. Shares the same studio, sales force, and operational footprint as KZST and is a direct format sibling in the same cluster.

Broad incumbents

iHeartMedia: One of the largest U.S. radio broadcasters with hundreds of FM/AM stations nationwide plus the iHeartRadio streaming platform. Operates overlapping local advertising and broadcast distribution businesses at vastly greater scale than KZST.
Townsquare Media: Owner of numerous local radio stations and digital properties across mid-sized U.S. markets. Closely mirrors KZST's mid-market, hyper-local advertising proposition but at much greater scale.
Emmis Communications: U.S. radio broadcaster with local stations in multiple markets plus magazine and digital media properties. Relevant incumbent comparable for the local-radio-advertising business model.
Audacy (formerly Entercom): Major U.S. radio broadcaster operating numerous local stations and the Audacy streaming/podcast platform. Competes with KZST for local ad budgets at scale and represents the broader incumbent model in the radio industry.
Bonneville International: Privately held U.S. radio broadcaster operating local stations in markets including the Western U.S. Comparable business model as a private, family/faith-influenced local radio operator.
Cumulus Media: Multi-platform U.S. radio operator with hundreds of owned stations and Westwood One network. Relevant comparable for the local-station advertising business model that KZST operates.
Salem Communications (now Salem Media Group): U.S. radio broadcasting company with a portfolio of local stations and digital media properties. Comparable as a multi-station local radio operator, with additional focus on news/talk formats overlapping KZST's syndicated content.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

KZST financial estimates

Financial estimate

Revenue estimate

Valuation estimate

KZST leadership team

Management profile

Number of profiles

Profiles4 records

KZST funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

KZST M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about KZST

What does KZST do?

Is KZST a public or private company?

KZST is a private company. It is classified as corporate owned and is currently operating.

When was KZST founded?

KZST was founded in 1971. It employs 51 to 100 people.

Where is KZST based?

KZST is headquartered in Santa Rosa, United States, in the North America region.

How does KZST make money?

One revenue line is on record: advertising & Sponsorships.

Who are KZST's main competitors?

Direct peers on record are KFGY 92.9 (Froggy), KSRO 1350 AM and KVRV 97.7 The River. Broad incumbents are iHeartMedia, Townsquare Media, Emmis Communications, Audacy (formerly Entercom), Bonneville International, Cumulus Media and Salem Communications (now Salem Media Group).

Does KZST have an API?

No public API is recorded for KZST.

What industry is KZST in?

KZST's product category is Local Radio Broadcasting. Its primary akta.pro industry code is MPABACAD, Independent Local Radio Stations, with a secondary code of MPAIADAJ, Radio Streaming & Catch-Up Audio Platforms. Its NAICS code is 51611 and its SIC code is 4832.