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Nine21 alternatives & similar sites

nine21 — Single Family Office — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Private Equity →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
htp-maximum.com ↗	65 match 1 shared topics	HTP Maximum \| Wir geben Ihrem Unternehmen ein neues Zuhause	de	private-equity WordPress WooCommerce	robotsllmsaihumans	emailphone	none
htp-maximum.net ↗	65 match 1 shared topics	HTP Maximum \| Wir geben Ihrem Unternehmen ein neues Zuhause	de	private-equity WordPress WooCommerce	robotsllmsaihumans	emailphone	none
opsio-holding.de ↗	65 match 1 shared topics	OPSIO Holding GmbH — Private Beteiligungsgesellschaft	Germany de	private-equity	robots llmsaihumans	emailphone	none
rdh-verwaltung.com ↗	64 match 1 shared topics	RDH-Verwaltung GmbH - Private Investment Office	Switzerland~ de	private-equity WordPress	robotsllmsaihumans	emailphone	none
aetherius.ch ↗	64 match 1 shared topics	Aetherius AG — Strategische Beteiligungen, Zug	Switzerland de	private-equity	robotsllmsaihumans	emailphone	partial · 5
astoriuscapital.com ↗	64 match 1 shared topics	Home - Astorius Private Equity	de	private-equity WordPress	robotsllmsaihumans	emailphone	none
officium-treuhand.com ↗	64 match 1 shared topics	Officium Treuhand GmbH	de	private-equity Weebly	robotsllmsaihumans	emailphone	none
apinvestment.ch ↗	64 match 1 shared topics	A&P Alternative Investment LLC — Principal Investment · Unterägeri, Zug	Switzerland de	private-equity	robotsllmsaihumans	email phone	none
neukirchen-gruppe.de ↗	64 match 1 shared topics	Neukirchen Gruppe	Germany de	private-equity	robotsllmsaihumans	emailphone	none
ek-beteiligung.com ↗	63 match 1 shared topics	E&K Beteiligungs GmbH	de	private-equity	robotsllmsaihumans	emailphone	none
investag.at ↗	63 match 1 shared topics	INVEST AG - Private Equity - Eigenkapital - Beteiligungen	Austria de	private-equity WordPress	robotsllmsaihumans	email phone	none
r-invest.at ↗	63 match 1 shared topics	INVEST AG - Private Equity - Eigenkapital - Beteiligungen	Austria de	private-equity WordPress	robotsllmsaihumans	email phone	none
raiffeisen-invest.at ↗	63 match 1 shared topics	INVEST AG - Private Equity - Eigenkapital - Beteiligungen	Austria de	private-equity WordPress	robotsllmsaihumans	email phone	none
freyinvest.at ↗	63 match 1 shared topics	Frey \| Invest- und Entwicklungsgesellschaft \| Vorarlberg \| Dornbirn	Austria de	private-equity Wix	robots llmsaihumans	email phone	none
denby.at ↗	63 match 1 shared topics	Home	Austria de	private-equity	robotsllmsaihumans	emailphone	none
baxcapital.ch ↗	63 match 1 shared topics	Bax Capital Advisors AG \| Home	Switzerland de	private-equity	robotsllmsaihumans	emailphone	none
one-up.at ↗	62 match 1 shared topics	OneUp	Austria de	private-equity	robotsllmsaihumans	emailphone	none
captivacapital.ch ↗	62 match 1 shared topics	Captiva Capital Management AG	Switzerland de	private-equity	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.