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marcin kleczynski

T2 · manager / operator

Started Malwarebytes at age 14, grew it to ~800 people, 3M+ consumer subscribers, and a separate B2B brand (ThreatDown); took three rounds of all-secondary funding from VC, crossover, and private equity over 18 years.

4 calls·4 names·75% bull·last heard 7 months ago·Kleiner Perkins
track record

no scored calls yet — needs a stated position or a categorical verdict, with a matured window vs SPY

top calls

highest conviction · one per company
1sthigh conviction
$MALWAREBYTESMalwarebytesposition

Malwarebytes splits consumer and B2B, hits 3M subscribers and $200M ARR

Separating the consumer brand (Malwarebytes) from the new B2B brand (ThreatDown) with dedicated management unlocked growth; consumer side now has 3M+ paying subscribers, nearing $200M ARR, profitable and accelerating.

Kleiner Perkins2026-02episode →
2ndmedium conviction
$THREATDOWNThreatDownposition

ThreatDown launches as dedicated B2B brand with channel-focused GM

After splitting from Malwarebytes, ThreatDown hired a GM from B2B security channel sales who knows exactly how to execute the channel-first go-to-market motion that the combined company could not.

Kleiner Perkins2026-02episode →
3rdmedium conviction
$VECTORVector Capital

Vector Capital's PE accountability helped execute complex business separation

Private equity partner Vector provided operational expertise in splitting financials, legal separation, and launching a new brand — areas where VCs typically don't help — and the accountability-driven environment suited the founder.

Kleiner Perkins2026-02episode →

most discussed · click a bar to filter

  • $THREATDOWN
  • $VECTOR
  • $MALWAREBYTES
  • $ANTHROPIC

recurring themes

  • AI Coding Agents1
  • Cybersecurity1
  • AI Bubble / Capex Debate1
  • Venture Capital1
4 total
$THREATDOWN
ThreatDown
MEDmarcin kleczynski·Kleiner Perkins·7 months ago·The AI Era of Cybercrime: How Malwarebytes Is Evolving Its Security Stack | Marcin Kleczynski· position
ThreatDown launches as dedicated B2B brand with channel-focused GM
After splitting from Malwarebytes, ThreatDown hired a GM from B2B security channel sales who knows exactly how to execute the channel-first go-to-market motion that the combined company could not.
"They just finally brought in a uh a GM of that business uh a couple months ago and she's doing great. She comes from B2B security channel sales and just knows exactly what to do a…"
25:48
$VECTOR
Vector Capital
MEDmarcin kleczynski·Kleiner Perkins·7 months ago·The AI Era of Cybercrime: How Malwarebytes Is Evolving Its Security Stack | Marcin Kleczynski
Vector Capital's PE accountability helped execute complex business separation
Private equity partner Vector provided operational expertise in splitting financials, legal separation, and launching a new brand — areas where VCs typically don't help — and the accountability-driven environment suited the founder.
"They're not great at product strategy and building culture and stuff like that. that's what, you know, they count on me for, but they're very good at helping, you know, an entrepr…"
22:49
$MALWAREBYTES
Malwarebytes
HIGHmarcin kleczynski·Kleiner Perkins·7 months ago·The AI Era of Cybercrime: How Malwarebytes Is Evolving Its Security Stack | Marcin Kleczynski· position
Malwarebytes splits consumer and B2B, hits 3M subscribers and $200M ARR
Separating the consumer brand (Malwarebytes) from the new B2B brand (ThreatDown) with dedicated management unlocked growth; consumer side now has 3M+ paying subscribers, nearing $200M ARR, profitable and accelerating.
"We surpassed three plus million paying subscribers. On the B2B side, you know, the go to market needed to change dramatically. Security solded the channel. So, it was just a a dif…"
18:22
$ANTHROPIC
Anthropic
LOWmarcin kleczynski·Kleiner Perkins·7 months ago·The AI Era of Cybercrime: How Malwarebytes Is Evolving Its Security Stack | Marcin Kleczynski
Anthropic cited as rare AI startup with real scale and customer usage
Host notes Anthropic grew from $1B to $9B ARR; founder agrees it's phenomenal but says the real concern is fringe AI cybersecurity startups raising hundreds of millions without proven scale.
"I think Anthropic grew from I don't know like$1 to9 billion or something phenomenal I mean it really is I mean that's absurd and those are not necessarily the companies I worry ab…"
41:38
9
AI Coding Agentstailwind
AI coding assistants are the most transformative AI application today
Both founder and host agree that even if all other AI progress stopped, code-generation models alone would change the world; Malwarebytes' head of engineering pushed for licenses a year ago and the founder saw ChatGPT write functional malware 18 months ago.
8
Cybersecuritytailwind
AI enables autonomous, hyper-personalized cyber attacks at scale
LLMs allow criminals to scrape every tidbit of personal data and generate perfectly crafted phishing emails from trusted contacts, driving autonomous attacks that trick victims into wiring money; consumers and businesses need new identity and data-removal defenses.
8
AI Bubble / Capex Debateheadwind
AI startup growth rates artificially inflated by insatiable GPU demand, shakeout coming
Many AI-native companies are raising at valuations assuming current hyper-growth persists, but demand is being pulled forward by infrastructure build-out; when the spigot turns, fringe players without real product-market fit will fail — similar to the SPAC cycle.
7
Venture Capitalmixed
Early AI fundraising mirrors SPAC cycle; later entrants will struggle to raise
Investors were hyped in early AI deals just like early SPACs; companies now doing the same thing as early winners will find it hard to raise. Over-capitalization before product-market fit distorts hiring, salary baselines, culture, and creates pressure to grow into unrealistic valuations.