In the week of November 2, 2026, 9 companies in Boston filed a new SEC Form D, reporting $112.44M sold in all. The biggest raise was AI3 Bio, Inc., at $48.34M (Watertown, MA). 5 of them filed a Form D for the first time. That is up from 3 the week before, against a 12-week average of 4.7 (SEC Form D, November 4, 2026).
9 companies in Boston filed this week, up from 3 the week before, against a 12-week average of 4.7. The biggest raise was AI3 Bio, Inc. at $48.34M, based in Watertown, MA.
Companies raising per week
Every raise this week
| Based | People named | |||
|---|---|---|---|---|
| AI3 Bio, Inc. | $48.34M | 2026-11-04 | Watertown, MA | Steven Altschuler, Michael Lyman +5 |
| Rgenta Therapeutics, Inc. first filing | $41.85M | 2026-11-03 | Woburn, MA | Hualin Xi, Yichao Fan +8 |
| Trinity AI Boston, Inc. first filing | $6M | 2026-11-05 | Andover, MA | Jayashankar Nanjundaswamy, Ganesh Ramamoorthy +1 |
| MitoAI Inc. | $5.45M | 2026-11-04 | Boston, MA | Bingda Li, Guanlin Li +2 |
| Lithios Inc. | $5.06M | 2026-11-04 | Medford, MA | Mohammad Alkhadra, Daniel Goldman |
| BridgeHealth Pharmaceuticals, Inc. first filing | $3.50M | 2026-11-05 | Woburn, MA | Neal Muni, Indu Muni +1 |
| Tremont AI, Inc. first filing | $2M | 2026-11-04 | Boston, MA | Long Le |
| Multikor.ai, Inc. | $138K | 2026-11-06 | Charlestown, MA | Suresh Nelakantam, J. Benson +1 |
| Sanaren, Inc. first filing | $100K | 2026-11-05 | Andover, MA | Zuwen Kuang |
| AI3 Bio, Inc. | — | 2026-11-04 | Watertown, MA | Steven Altschuler, Michael Lyman +5 |
First-time filers
BridgeHealth Pharmaceuticals, Inc., Trinity AI Boston, Inc., Rgenta Therapeutics, Inc., Tremont AI, Inc., Sanaren, Inc. filed their first Form D on record this week.
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By sector and metro
Pharmaceuticals in Boston AI and software in Boston Biotech in Boston
How this list is built
Every company here filed a Form D with the SEC in the week 2026-11-02 to 2026-11-08. A Form D is the notice a company files when it sells shares or other securities without a public offering, so it catches seed rounds, small rounds and rounds that were never announced, alongside the large ones that make the news. Only new offerings by operating companies count: amendments, pooled investment funds, real estate vehicles and special purpose vehicles are left out, so each row is a company raising money for itself.
The amount shown is the total the filing reports as sold so far. Some filings report nothing sold yet; those rows show a dash and add nothing to the totals. "First filing" marks a company whose first Form D on record this is. Each company links to our page for the filing, or to the SEC's own copy, and the list can be copied as CSV for a spreadsheet.
Cite this page
https://mentionfox.com/funding/week/2026-45/boston