X4 Pharmaceuticals is based in Boston. It has raised $75M in total funding. Backed by Coastlands Capital, Bain Capital Life Sciences.
X4 Pharmaceuticals funding overview
X4 Pharmaceuticals is based in Boston. X4 Pharmaceuticals has raised $75M in total disclosed funding. That places its disclosed total in the $25M–$100M range. The round record for X4 Pharmaceuticals runs through 2025; nothing later has been disclosed. Investors on record include Coastlands Capital, Bain Capital Life Sciences, New Enterprise Associates, BVF Partners LP, Deep Track Capital, Kalehua Capital and 3 others. 9 distinct backers are named across the disclosed rounds.
X4 Pharmaceuticals at a glance
Total raised
$75M
Latest round date
August 2025
Headquarters
Boston
Notable investors
Coastlands Capital, Bain Capital Life Sciences, New Enterprise Associates, BVF Partners LP, Deep Track Capital, Kalehua Capital, Nantahala Capital, Stonepine Capital Management
Frequently asked about X4 Pharmaceuticals funding
How much has X4 Pharmaceuticals raised?
X4 Pharmaceuticals has raised $75M in total disclosed funding across the rounds on record.
Who has invested in X4 Pharmaceuticals?
Coastlands Capital, Bain Capital Life Sciences, New Enterprise Associates, BVF Partners LP, Deep Track Capital, Kalehua Capital are named among the investors backing X4 Pharmaceuticals.
What was the latest X4 Pharmaceuticals funding round?
No round stage has been disclosed for X4 Pharmaceuticals.
Where is X4 Pharmaceuticals based?
X4 Pharmaceuticals is based in Boston.
When did X4 Pharmaceuticals last raise?
The last disclosed X4 Pharmaceuticals round closed in August 2025.
X4 Pharmaceuticals totals reflect disclosed capital only — undisclosed extensions and secondaries are excluded. Use the related companies in Boston below to benchmark round size and investor mix.
