Industry contemporary
A10 & Kemp - the ADC challengers
The second tier that kept the load-balancing leaders honest: A10 from the throughput flank, Kemp from below.
Application delivery never became a monopoly, and these two are why. Lee Chen's A10 built its franchise where traffic is heaviest - CGNAT, DDoS, the service-provider tier - while Kemp's LoadMaster priced the ADC for the Exchange administrator and went virtual before the market did. Every leader's quote was written knowing they existed.
The profile covers both foundings, the Brocade litigation chapter, the 2014 A10 IPO, the CGNAT decade, Thunder TPS, Kemp's virtual-first bet, and the 2021 Progress acquisition.
Founding stories
Kemp Technologies
Kemp attacked the load-balancing market from below. While the leaders sold six-figure chassis to people with change-control boards, LoadMaster sold for the price of a server to the administrator who just needed Exchange to stay up - and Kemp leaned into exactly that buyer, publishing Microsoft-workload deployment guides so specific they became the documentation of record. An early, wholehearted move to virtual appliances widened the wedge: when the hypervisor became the data center, Kemp was already there, priced for the mid-market the giants kept forgetting.
A10 Networks
Lee Chen had already co-founded Centillion Networks and Foundry Networks when he started A10 in 2004 - a third act aimed at the application-delivery market from the performance flank. The AX Series, and later the Thunder line on the ACOS operating system, courted the buyers who measure in millions of concurrent sessions: service providers, carriers, and the web-scale operators for whom carrier-grade NAT and DDoS absorption are line items, not features. Where the market leader owned the enterprise data center, A10 built its franchise where the traffic is heaviest.
The timeline
- A10 founded
Chen's third company enters application delivery with a performance thesis: purpose-built hardware and ACOS software for the highest-throughput tier of the market.
- LoadMaster goes virtual early
Kemp ships virtual editions while much of the industry still equates an ADC with sheet metal - a bet on the hypervisor that pays compounding dividends as data centers virtualize.
- The Foundry shadow
Years of litigation between Brocade (Foundry's acquirer) and A10 over Foundry-era intellectual property run their course and end in settlement - a bruising chapter the company absorbs and outlives.
Brocade v. A10 litigation and settlement per the public record; the verdict-and-appeal history is deliberately summarized without figures.
- A10 goes public
March 2014: A10 lists on the NYSE as ATEN, its service-provider franchise - CGNAT for the IPv4 endgame, Thunder TPS for DDoS - now the company's signature.
- The CGNAT decade
IPv4 exhaustion turns carrier-grade NAT from a transition hack into permanent infrastructure, and A10's Thunder CGN becomes one of the boxes the mobile internet quietly runs through.
- New leadership at A10
Dhrupad Trivedi takes the helm; the company tightens around security and service-provider infrastructure - DDoS defense, TLS inspection, and the 5G core edge.
- Progress acquires Kemp
Progress Software buys Kemp for approximately $258 million - the affordable-ADC pioneer becoming the application-experience arm of a software house, LoadMaster continuing under new ownership.
Approximately $258M, announced September 2021, closed November 2021, per Progress Software's public statements.
Flagship products and solutions
- Thunder / ACOS (A10)The high-throughput ADC, CGNAT, and DDoS-defense line - the service-provider tier's alternative answer.
- LoadMaster (Kemp)The affordable ADC in hardware, virtual, and cloud forms - load balancing sized and priced for the workloads most organizations actually run.
- Thunder TPSA10's DDoS mitigation platform - absorption and scrubbing at the carrier scale where attacks are weather, not events.
Key innovations
- Keeping the leaders honestThe challengers' structural contribution: every F5 or Citrix quote for two decades was written knowing A10 could undercut on throughput-per-dollar and Kemp on entry price. Competitive gravity is an innovation too.
- The virtual-first ADCKemp's early virtual LoadMaster reframed the ADC as software with optional sheet metal - the framing the whole market, leaders included, eventually adopted.
Main markets
A10: service providers, carriers, and web-scale operators - CGNAT, DDoS defense, TLS inspection, 5G infrastructure. Kemp: the mid-market and Microsoft-workload world, now inside Progress. Between them, the proof that application delivery is a market, not a monopoly.
Analyst standing
- The load-balancing methods taught on this site - the algorithms, the health monitors, the persistence models - are the same machinery these platforms market; the vendor changes, the mathematics does not.
- The pair also maps the market's two honest escape routes from the leader's pricing: down (Kemp's entry cost) and sideways (A10's throughput tier) - the study in how challengers survive a category with a dominant incumbent.