Diagonal Therapeutics

Drug Discovery · Watertown, MA · Founded 2022 · Privately Held (backing)

Operator of a biotech company intended to discover and develop agonist antibodies. Diagonal Therapeutics is based in Watertown, MA and was founded in 2022. It was valued at $459 million at its early-stage round in Jan 2026, the last priced event on record. It has raised $271 million across 2 recorded rounds; the latest was a $125 million Series B in Jan 2026.

PMV mark · valuation
$458.5M
Oct 2026
Priced at
its early-stage round
Jan 2026
Total raised
$271.3M
Last round
Early Stage VC (Series B)
Jan 2026
What is Diagonal Therapeutics worth?
$458.5MPrivateMarketView mark · Oct 2026

Valued at $458.5M at its early-stage round, Jan 2026. Nothing has traded since.

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Valuation timeline

0 priced rounds · 32 daily marks since · Sep 2026 – Oct 2026
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Diagonal Therapeutics funding history

2 rounds
DateRoundRaisedPost-money
Jan 2026Early Stage VC (Series B)$125.0M▮
Apr 2024Early Stage VC (Series A)$128.0M▮
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Diagonal Therapeutics valuation

Diagonal Therapeutics was valued at $459 million at its early-stage round in Jan 2026. That is the last priced event on record: no secondary trade or institutional fund mark has moved the figure since.

How much has Diagonal Therapeutics raised?

Diagonal Therapeutics has raised $271 million across 2 recorded rounds since 2024. The largest was a $128 million Series A in Apr 2024; the most recent was a $125 million Series B in Jan 2026.

Comparable companies

Comparable drug discovery names by valuation on PrivateMarketView: Rivus Pharmaceuticals ($489 million), Electra Therapeutics ($479 million) and CORXEL Pharmaceuticals ($475 million).

How Diagonal Therapeutics's valuation is determined

Private company valuations aren’t quoted on an exchange — they’re established in moments: a priced funding round sets a post-money valuation, secondary trades print at a price per share, and SEC-registered funds holding the stock report fair-value marks in their N-PORT filings.

For Diagonal Therapeutics, the most current credible signal sets the number and the older ones confirm it: a live secondary-market price first, then three or more recent prints, then institutional fund marks, and otherwise the last priced round, which never decays. The valuation is the last round’s post-money moved by the price change since that round, so no share count is assumed. Today it is set by its last priced round. Question about this number? Full methodology →

Frequently asked about Diagonal Therapeutics

What is Diagonal Therapeutics worth?
Diagonal Therapeutics is valued at $458.5M as of Oct 2026. Valued at $458.5M at its early-stage round, Jan 2026. Nothing has traded since.
How much has Diagonal Therapeutics raised?
Diagonal Therapeutics has raised $271.3M in total funding across 2 recorded rounds.
When did Diagonal Therapeutics last raise?
Diagonal Therapeutics last raised in Jan 2026 (Early Stage VC (Series B)), raising $125.0M.