/Investor DB

Rock Springs Capital — Full Portfolio

34 tracked investments · listed companies and verified rows first

Avalyn Pharma Incavalynpharma.cominNASDAQ: AVLNSep 2023 · $175M

Avalyn Pharma develops inhaled therapies for pulmonary fibrosis, using a nebulization approach that delivers treatment directly to the lungs to reduce the tolerability problems of existing oral therapies.

BiotechHealthtech

Lyn Baranowski(CEO)in

Co-investorsAndera PartnersCatalio Capital Management, LPF-Prime CapitalInVivium CapitalNorwest Venture PartnersPivotal Life Sciences+9 more

Bolt Biotherapeuticsboltbio.comin𝕏NASDAQ: BOLT

Bolt Biotherapeutics is a clinical-stage biotech company developing novel immunotherapies that leverage innate immune system mechanisms to treat cancer.

BiotechHealthtechMedical DevicesSan Francisco, US

Dr. Edgar G. Engleman(Founder)

Co-investorsPfizer Venture InvestmentsPivotal Life SciencesRA CapitalSamsara BioCapitalSofinnova VenturesVivo Capital+3 more

Disc Medicinediscmedicine.comin𝕏NASDAQ: IRONSep 2021 · $90M

Disc Medicine is a biopharmaceutical company developing therapies from discovery through clinical development for patients in need.

BiotechHealthtech

John Quisel(Chief Executive Officer)inJean Franchi(Chief Financial Officer)inJonathan Yu(Chief Operating Officer)inWill Savage(Chief Medical Officer)inPamela Stephenson(Chief Commercial Officer)inSteve Caffé(Chief Regulatory Officer)in

Co-investorsAccess BiotechnologyAtlas VentureBain Capital Life SciencesForesite CapitalFrazier Life SciencesOrbiMed+7 more

ImaraNASDAQ: ELVNMar 2019 · $63Macquired by Enliven Therapeutics · Feb 2023

Imara is a clinical-stage biopharmaceutical company developing small molecule therapeutics for unmet medical needs, currently advancing ELVN-001, a selective kinase inhibitor designed to treat chronic myeloid leukemia by targeting the BCR-ABL gene fusion.

BiotechCambridge, US

James G. McArthur(Executive Officer, Director)Christoph M. Adams(Executive Officer, Director)Richard Fair(President, Chief Executive Officer, Director)

BoardSara Nayeem(Director)Barbara Dalton(Director)David Mott(Director)

Co-investorsBay City CapitalNew Enterprise Associates (NEA)Pfizer Venture InvestmentsRA CapitalAlexandriaArix Bioscience+3 more

Immuneeringimmuneering.comin𝕏NASDAQ: IMRX

Immuneering develops Deep Cyclic Inhibitors, a class of oncology medicines designed to pulse dosing faster than cancer's adaptive mechanisms to limit resistance and reduce side effects.

BiotechHealthtechCambridge, US

Benjamin J. Zeskind(Executive Officer, Director)Harold E. Brakewood(Chief Business Officer)inBrett Hall(Chief Scientific Officer)inMichael D. Bookman(Chief Legal Officer, Secretary)inIgor Matushansky(Chief Medical Officer)Mallory Morales(SVP Finance, Chief Accounting Officer, Treasurer)in

Co-investorsT. Rowe Price

Korro Biokorrobio.comin𝕏NASDAQ: KRROApr 2024 · $70M

Korro Bio is a biotechnology company developing a new class of RNA-editing therapies guided by human genetics and disease biology.

BiotechHealthtechCambridge, US

Nessan Bermingham(Mr. Bermingham is the Executive Chair of the Issuer.)inJean-François Formela(Director)inOmmer Chohan(Mr. Chohan is the Secretary and Treasurer of the Issuer.)inRam Aiyar(Chief Executive Officer, President and Director)inTodd Chappell(Chief Operating Officer)in

Co-investorsAtlas VentureMC Healthcare VenturesNew Enterprise Associates (NEA)AlexandriaQiming Venture PartnersQiming Venture Partners USA+3 more

Xilio Therapeuticsxiliotx.cominNASDAQ: XLO

Xilio Therapeutics is a clinical-stage biotechnology company developing masked immuno-oncology therapies that use protein engineering to remain inactive until activated by tumor-specific proteases within the tumor microenvironment.

BiotechHealthtechWaltham, US

René Russo(Executive Officer, Director)inJoseph Farmer(Executive Officer)Timothy Clackson(Executive Officer)Christopher Frankenfield(Chief Financial and Operating Officer)inKatarina Luptakova(Chief Medical Officer)inPaul Clancy(Director)

Co-investorsBain Capital Life SciencesBay City CapitalF-Prime CapitalM VenturesMRL Ventures FundRA Capital+9 more

Apollo Therapeuticsapollotx.cominSep 2023 · $226.5M✓ verified

A portfolio biopharmaceutical company translating basic medical research breakthroughs from leading universities into novel therapeutic medicines.

BiotechDeep TechHealthtechMedical DevicesCambridge, GB

Richard Butt(Chief Scientific Officer)inSanjay Aggarwal(Chief Medical Officer)in

Co-investorsPatient Square CapitalAlbionVCUCL Technology FundIP Group

Abcuroabcuro.comAug 2026

Abcuro develops therapies that target highly cytotoxic T cells for autoimmune diseases, including its lead candidate ulviprubart for inclusion body myositis.

BiotechHealthtechNewton, US

Steven A. Greenberg(Chief Scientific Advisor & Co-Founder)Steven A. Greenberg, MD(Chief Scientific Advisor & Co-Founder)John Alexander Martin(Executive Officer, Director)Stefano Gulla(Founder)Evan Thompson(Executive Officer)David de Graaf(Executive Officer, Director)

Co-investorsBain Capital Life SciencesNew Enterprise Associates (NEA)RA CapitalSamsara BioCapitalSanofi VenturesMass General Brigham Ventures+9 more

Affinivaxaffinivax.comin𝕏

Affinivax was a clinical-stage biopharmaceutical company that developed next-generation pneumococcal vaccines using its proprietary Multiple Antigen Presenting System (MAPS) platform technology.

BiotechMedical DevicesCambridge, US

Richard Malley(Director)inKamran Tavangar(Executive Officer)Steven Brugger(Executive Officer, Director)in

BoardRobert More(Director)Frances Heller(Director)George Siber(Director)

Co-investorsBain Capital Life SciencesEcoR1 CapitalForesite CapitalBain CapitalT. Rowe Price

Aptinyxaptinyx.com

BiotechEvanston, US

Joseph R. Moskal(Chief Scientific Officer)Torsten M. Madsen(Chief Marketing Officer)Ashish Khanna(Secretary & Chief Business Officer)Norbert G. Riedel(Chief Executive Officer)

BoardLiam Ratcliffe(Director)Terry P. Gould(Director)

Co-investorsBain Capital Life SciencesFrazier Life SciencesLatterell Venture PartnersLongitude CapitalOUP (Osage University Partners)Agent Capital+3 more

Arsenal Biosciencesarsenalbio.comSep 2024

Arsenal Biosciences is a clinical-stage company developing programmable cell therapies to treat solid tumors.

BiotechHealthtechMedical DevicesSouth San Francisco, US

Ken Drazan(Founder)James Ahlers(Executive Officer)Irene Pleasure(Executive Officer)Margaret Nibbi(Executive Officer)Alexander Marson(Founder)Kole Roybal(Founder)

Co-investorsARCH Venture PartnersHitachi VenturesKleiner PerkinsLuma GroupOUP (Osage University Partners)SoftBank Vision Fund+4 more

Athiraathira.comJun 2020 · $85M

A biotechnology company developing new therapies for patients with high unmet medical needs.

Biotech

Co-investorsDolby Family VenturesLifeSci Venture PartnersSofinnova VenturesThe W FundCommodore CapitalFranklin Templeton+5 more

Avenge Bioavengebio.comJan 2022 · $45M

Biotechnology company developing the LOCOcyte cell-therapy platform for local dosing of immunotherapeutics.

Co-investorsLongitude CapitalPappas CapitalPerceptive Xontogeny Venture

City Therapeuticscitytx.comin𝕏Oct 2024

City Therapeutics develops RNAi-based medicines targeting rare, specialty, and prevalent diseases using engineered trigger molecules and precision delivery ligands.

BiotechMedical DevicesCambridge, US

Mark Keating, MD(Co-founder)Kotaro Nakanishi, PhD(Co-founder)Yukihide Tomari, PhD(Co-founder)Phillip Zamore, PhD(Co-founder)Andy Orth(Chief Executive Officer)in

Co-investorsAN Venture PartnersARCH Venture PartnersSofinnova VenturesViking GlobalAltitude Ventures Management, LlcCasdin Capital+5 more

Fusion Pharmaceuticalsfusionpharma.comin𝕏Apr 2019 · $105M

Fusion Pharma develops targeted alpha therapeutics that link alpha-emitting medical isotopes to molecules targeting biomarkers on cancer cell surfaces to selectively kill tumor cells.

BiotechHealthtech

John Valliant(Founder)in

Co-investorsFACIT (Fight Against Cancer Innovation Trust)HealthCapLumira VenturesPivotal Life SciencesSeroba Life SciencesVenture Ontario+6 more

Homology Medicineshomologymedicines.cominJul 2017

Clinical-stage genetic medicines company using human-derived AAV vectors and nuclease-free gene editing for rare diseases.

BiotechBedford, US

Siyamak Rasty(Executive Officer)Albert Seymour(Executive Officer)

BoardSteven Gillis(Director)Arthur Tzianabos(Executive Officer, Director)Kush Parmar(Director)inRichard Gregory(Director)

Co-investors5AM VenturesARCH Venture PartnersOUP (Osage University Partners)AlexandriaDeerfield Management CompanyFidelity Investments+5 more

Honorhonorcare.comin𝕏Oct 2021

Honor Technology develops technology platforms and operates brands that provide goods and services for aging adults, aiming to support independent living.

Digital HealthHealthtechLongevitySaaSSan Francisco, US

Cameron Ring(Founder)inMonica Doss(Co-Founder)Monica Lo(Founder)inSandy Jen(Founder)inSeth Sternberg(Founder)inLori Hogan.(Founder)

Co-investorsAndreessen HorowitzBaillie Gifford8VCAlumni VenturesBAM VenturesEnsemble Labs+6 more

Imperativeimperative.comin𝕏Jul 2021 · $260M

Chronus is a platform that connects employees for guided, AI-assisted conversations focused on career development, mentoring, community building, and change adoption in enterprise organizations.

AI & Machine LearningEnterprise SoftwareFuture of WorkHR TechSaaSNew York, US

Aaron Hurst(Founder)in

Co-investorsEmpire AngelsVoyager CapitalAlly Bridge GroupAmed VenturesAscension VenturesBain Capital Life Sciences+4 more

MOMA Therapeuticsmomatx.comin𝕏May 2022 · $150M

A drug discovery company staffed by scientists and industry specialists focused on developing pharmaceutical candidates.

Biotech

Timur Yusufzai(Founder)inAsit Parikh(Chief Executive Officer)in

Co-investorsLifeSci Venture PartnersNextech InvestThird Rock VenturesAlexandriaCasdin CapitalCreacion Ventures+3 more

Reneoreneo.deinDec 2020 · $95M

Reneo is an asset and investment management platform for decarbonizing residential real estate portfolios in Germany.

Climate TechEnterprise SoftwarePropTechGermany, DE

Lennart Börner(Founder & Co-CEO)inAlexander Graubner-Müller(Founder & Co-CEO)in

Co-investorsFoundamentalAbingworthAisling CapitalAmzak HealthEurazeoLakestar+4 more

Reneo Pharmaceuticalsreneopharma.comDec 2020 · $95M

Xoilac TV is a free online football (soccer) live-streaming platform serving fans in Vietnam, offering Full HD match broadcasts of European, Asian, Vietnamese, and international competitions.

ConsumerMedia & EntertainmentSports Tech

Co-investorsAisling CapitalNew Enterprise Associates (NEA)Pappas CapitalRiverVest Venture PartnersAbingworthAmzak Health+2 more

Seroba Lifesciencesseroba-lifesciences.cominApr 2019 · $105M

This page is a news post from Azafaros, a biopharmaceutical company developing disease-modifying therapeutics for lysosomal storage disorders with a focus on neurological symptoms.

Biotech

Co-investorsCDP Venture CapitalIreland Strategic Investment FundAdams Street PartnersGenesys CapitalHealthCapOrbiMed+1 more

Simcha Therapeuticssimchatx.cominJan 2022 · $40M

Simcha is a biotechnology company developing new cancer medicines based on immune biology research.

BiotechHealthtechNew Haven, US

Aaron Ring(Executive Officer, Director)inBeatrice McQueen(Chief Operating Officer)inSanuj Ravindran(Chief Executive Officer)Jeremy Barton(Chief Medical Director)Hirdesh Uppal(Senior Vice President Translational Research and Development Sciences)Joseph Catino(Executive Officer)

Co-investorsConnecticut InnovationsPfizer Venture InvestmentsSR One Capital ManagementAxial VCBiotechnology Value FundSamsara BioCapital

Synthekinesynthekine.comin𝕏

Synthekine is a clinical-stage biotechnology company using protein engineering platforms to develop cytokine-based immunotherapies designed to preserve therapeutic efficacy while avoiding toxicities linked to cytokine pleiotropy.

BiotechHealthtech

K. Christopher Garcia(Founder)Susan Molineaux(CEO)inMartin Oft(Chief Scientific Officer)inNaiyer Rizvi(Chief Medical Officer)inGregory(Chief Technical Officer)Geoff(Chief Business Officer)

Co-investorsSamsara BioCapitalThe Column GroupBain Capital Life SciencesCanaan PartnersRA CapitalTCG Crossover+2 more

Theseustheseus.usinApr 2021

Theseus builds robotic situational awareness software using visual positioning for drones that operate in GPS-denied environments.

Advanced ManufacturingAI & Machine LearningDefense TechHardwareRoboticsSan Francisco, US

Ian Laffey(Founder)inSacha Lévy(Founder)inCarl Schoeller(Founder)

Co-investorsY CombinatorFirst Round CapitalPioneerAntlerEndor CapitalForesite Capital+7 more

Theseus Pharmaceuticalstheseusrx.comApr 2021

BiotechCambridge, US

William C. Shakespeare(Director)in

BoardIain Dukes(Executive Officer, Director)inMichael Rome(Director)inCarl Gordon(Director)in

Co-investorsForesite CapitalLongitude CapitalNextech InvestNexTech VenturesOmega FundsOrbiMed+2 more

Treeline Biosciencestreeline.bioSep 2025

Treeline develops therapeutics focused on oncology, leveraging insights from clinical practice and laboratory research.

AI & Machine LearningBiotechHealthtechMedical DevicesWatertown, US

Joshua H. Bilenker(Executive Officer, Director, Promoter)Jeffrey Engelman(Executive Officer, Director, Promoter)inJosh Bilenker(Founder)inJosh Bilenker Jeff Engelman(Founder)

BoardKristina Burow(Director)inAli Satvat(Director)

Co-investorsAisling CapitalARCH Venture PartnersGV (Google Ventures)OrbiMedARC VENTURESCasdin Capital+2 more

Verve Therapeuticsvervetx.comJan 2021

Cambridge, MA biotech developing single-course in vivo base editing medicines to permanently lower cardiovascular disease risk.

BiotechCambridge, US

Andrew Ashe(Executive Officer)Sekar Kathiresan(Founder)inAndrew Bellinger(Executive Officer)Kiran Musunuru(Founder)

BoardJohn Evans(Director)Anthony Philippakis(Director)in

Co-investorsARCH Venture PartnersF-Prime CapitalGV (Google Ventures)RA CapitalvenBio PartnersWellington Management+3 more

Vets First Choicevetsfirstchoice.cominJul 2017 · $223M

Covetrus provides software and pharmacy solutions for veterinary practices, including an integrated platform that manages prescription workflows, online pharmacy storefronts with home delivery, and compounded medication services.

HealthtechMedical DevicesSaaS

Co-investorsHarbor Light Capital PartnersMountain Group CapitalBorealis VenturesClayton Dubilier & RiceHLM Investment PartnersSequoia Heritage+1 more

Other

Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.

EIP PharmaFlame BiosciencesMenlo TherapeuticsSpark Therapeutics

Rows marked “SEC filing” are inferred from directors named on the company's SEC Form D — public regulatory data, not a portfolio list published by the firm.