Series B investors in Boston
This slice of our investor database holds 68 Series B Boston investors.
About this slice
This slice of our investor database holds 68 Series B Boston investors. They sit in 4 cities, most of them in Boston (49), Cambridge (13) and Newton (3). The sectors they back most often here are SaaS (35), health tech (34) and fintech (26). The median firm in this slice has made 67 investments; across the slice the total is 6,783. The median number of exits is 16. By stage: Pre-seed (36), Seed (60), Series A (66), Series B (68) and Growth (47). The largest portfolios in this slice belong to Battery Ventures, Polaris Partners and Atlas Venture. Every row below is shown in full except the contact details, which are the paid part of the dataset. The numbers on this page are recomputed from the database, so they change when the data does.
Who is deploying in this slice
Covered: 38% of the slice. The rest are marked no data — which is not the same as inactive. Which funds these are, and the link proving it, is in the paid export.
- 68 firms in this slice.
- Most concentrated in Boston (49).
- Median investments per firm: 67.
- Leading sector: SaaS (35).
- 68 rows carry a contact address; those are the paid part.
| By stage | Investors |
|---|---|
| Pre-seed | 36 |
| Seed | 60 |
| Series A | 66 |
| Series B | 68 |
| Growth | 47 |
| By sector | Investors |
|---|---|
| saas | 35 |
| healthtech | 34 |
| fintech | 26 |
| biotech | 22 |
| ai | 20 |
| mobile | 20 |
| consumer | 19 |
| enterprise | 18 |
| data-analytics | 16 |
| ecommerce | 13 |
| By city | Investors |
|---|---|
| Boston | 49 |
| Cambridge | 13 |
| Newton | 3 |
| Waltham | 3 |
| By type | Investors |
|---|---|
| Venture funds | 66 |
| Corporate VC | 1 |
| Family offices | 1 |
Number of investments made, by firm.
| Portfolio size | Investors |
|---|---|
| 0–10 | 3 |
| 10–25 | 7 |
| 25–50 | 11 |
| 50–100 | 12 |
| 100+ | 19 |
Preview — 15 of 68
| Investor | Type | Location | Stages | Investments | Contact |
|---|---|---|---|---|---|
| Battery Ventures | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Polaris Partners | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Atlas Venture | Venture funds | Cambridge, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Spark Capital | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Summit Partners | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| F-Prime Capital | Venture funds | Cambridge, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| SV Health Investors | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| RA Capital | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Flagship Pioneering | Venture funds | Cambridge, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Wellington Management | Venture funds | Boston, US | Series B, Seed, Growth, Series A | ||
| Boston Millennia Partners | Venture funds | Boston, US | Series B, Seed, Growth, Series A | ||
| HLM Venture Partners | Venture funds | Boston, US | Series B, Growth, Series A | ||
| Bain Capital | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Third Rock Ventures | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A | ||
| Omega Funds | Venture funds | Boston, US | Series B, Seed, Growth, Pre-seed, Series A |
The first three rows link out to the funds themselves. Investment counts and contacts for every row come with the export.
Choose your export
- 68 investors in this slice, with working email
- One-time payment — no subscription, no recurring fees
- Instant download in XLSX and CSV
- Website, LinkedIn, Twitter, sectors, stages, portfolio and exits
Access follows the list, not a file: the export is rebuilt regularly and you always download the current version. Last rebuilt October 20, 2026.
- Every investor in the database, with working email — this slice included
- One-time payment — no subscription, no recurring fees
- Instant download in XLSX and CSV
- Website, LinkedIn, Twitter, sectors, stages, portfolio and exits
Access follows the list, not a file: the export is rebuilt regularly and you always download the current version. Last rebuilt October 20, 2026.
Questions
What is free here?
Name, type, stages, sectors, city and country, website, investment and exit counts — as aggregates across all 68 rows and row by row for the first fifteen. Contact addresses are not part of the free view and are physically absent from this page.
What does buying add?
The full export of all 68 rows in XLSX and CSV, including contact email (68 rows have one). Access follows the list, not a file: the export is rebuilt and you always download the current version.
Where does the data come from?
Source and method are described on the investor data sources page. We do not claim verification that did not happen — each row carries a confidence level. An investor who asks to be excluded is removed from both the preview and the export.
Updated 10/20/2026