Siobhan Nolan Mangini is a Partner at Venrock.
What Siobhan can write
Writes checks of$3M to $30M
Comes in atSeed, Series A, Series BCan lead the round
Ownership target7-10%, 10-12%, > 12%At first check
Best routeA warm introAsk a founder in their portfolio.
Venrock writes $3M to $30M checks, larger than 93% of firms in the atlas.
Bars: how many firms report each check band. Highlighted: Venrock.Also at Venrock
Partners like Siobhan
At firms with a similar stage, sector and check size.
Alert me when Venrock is active
One email when Siobhan's firm raises a fund, adds a partner or shows new activity.
Send Mode VC your deck
Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.
Send your deckQuestions
Who is Siobhan Nolan Mangini?
Siobhan Nolan Mangini is a Partner at Venrock.
How much does Siobhan Nolan Mangini invest?
Siobhan Nolan Mangini invests through Venrock, which writes checks of $3M to $30M at seed, series a, series b.
How do I pitch Siobhan Nolan Mangini?
A warm intro from a founder Venrock backed works best.
Last updated 2026-10-15. Is this you? Ask for a correction.