FirstMark @FirstMarkCap
Early-stage venture capital firm based in New York City. firstmark.com New York, NY Joined November 2009-
Tweets7K
-
Followers21K
-
Following479
-
Likes8K
2025 has been a wild year for AI video. My conversation with @c_valenzuelab, CEO of @runwayml: 00:00 – Meet Cris and Runway – AI Video's Wild Year 01:48 – Runway's AI Film Festival Goes From Chinatown To IMAX 04:02 – Hollywood's Shift: From Ignoring AI To Adopting It At…
Thank you for 10,000 stars and 100 contributors — on the same day! We're excited to continue building a next-generation open-source stack for LLM applications. Find us on GitHub ↓
Today in ‘VCs congratulating portfolio companies but really congratulating themselves’: major kudos to @dataiku, @clickhouse and @synthesiaIO for being nominated to the Forbes #cloud100 list
Another record-breaking stretch at @synthesiaIO: - Crossed $100m ARR in early April 2025 - Doubled revenue YoY (Growth accelerated to 100% from 80% at Series D) - Hit 142% NRR (up from 119% a year ago) - Quadrupled our $100K+ customer base in 12 months - Trusted by +80% of…
running a nyc gp search has been a reminder of how far the ecosystem has come. oai, cursor, thrive all in soho, flatiron still a gem for tech. city feels white hot right now. 6x growth in active vc firms since 2010 (2+ direct seed or series a investments) isn’t just noise, it’s…
The 23-time Grand Slam winner opens up about her decision to go on the weight management drug. vogue.com/article/serena…
Serena Williams has been taking a GLP-1 medication to help with her recent weight loss, she revealed for the first time in an exclusive TODAY interview. today.com/health/womens-…
@serenawilliams is on Ro! There are few people in the world with more willpower than Serena. She trained hard after having kids but her body didn’t respond the same way. She turned to Ro to reach her goals. youtube.com/watch?v=_MAYsc…
1/ @serenawilliams is our newest ambassador at @ro. She’s sharing her weight loss story to inspire others. She has more willpower than most people on the planet and is the perfect example that weight is not just a matter of “diet and exercise”.
AI agents now get memory that’s real-time, secure, and structured. SurrealMCP connects your AI tools to SurrealDB with zero glue code. Run locally, on-prem, or in SurrealDB Cloud. Learn more. 👉 sdb.li/4mrS88H
How to build a beloved AI product, with @meetgranola CEO @cjpedregal Granola is the rare AI startup that slipped into a very crowded niche — meeting notes — and still managed to become the product founders (and VCs!) rave about. Plenty of product lessons in this episode.…
Come join us for a special evening with HashiCorp Cofounder & CTO @armon and our friends at @Georgian_io as we dive into the future of AI & Infra 🚀 Apply to join below! Cc @DavidWaltcher lu.ma/s2hh8snr
Thrilled to (finally) announce our partnership with the inimitable @gabrielbianconi, @thebigmehtaphor & the entire @TensorZero team We've come a long way from the days when the website was just a floating 0 & the OSS launch was on the horizon, but it's been incredible to see the…
Thrilled to (finally) announce our partnership with the inimitable @gabrielbianconi, @thebigmehtaphor & the entire @TensorZero team We've come a long way from the days when the website was just a floating 0 & the OSS launch was on the horizon, but it's been incredible to see the…
Thrilled (and humbled, lol) to be involved here. Been thinking about feedback loops in AI forever and those guys are the real deal - @gabrielbianconi and @thebigmehtaphor
Thrilled (and humbled, lol) to be involved here. Been thinking about feedback loops in AI forever and those guys are the real deal - @gabrielbianconi and @thebigmehtaphor
TensorZero nabs $7.3M seed to solve the messy world of enterprise LLM development venturebeat.com/ai/tensorzero-…
Excited to share that we've raised a $7.3M seed round! "What will LLM engineering look like in a few years?" Viraj and I started building TensorZero last year after asking ourselves this question. Today, we're building an open-source stack for industrial-grade LLM…
Excited to share that we've raised a $7.3M seed round! "What will LLM engineering look like in a few years?" Viraj and I started building TensorZero last year after asking ourselves this question. Today, we're building an open-source stack for industrial-grade LLM…
Gabriel and I started this business programming in a tiny office for a year straight. We started with the idea that AI systems must be able to learn from real-world experience to solve real-world problems. Eventually it became clear that this was much more of a systems and data…
Gabriel and I started this business programming in a tiny office for a year straight. We started with the idea that AI systems must be able to learn from real-world experience to solve real-world problems. Eventually it became clear that this was much more of a systems and data…
Announcing our $7.3M seed round! TensorZero enables a data and learning flywheel for optimizing LLM applications: a feedback loop that turns production metrics and human feedback into smarter, faster, and cheaper models and agents. Today, we provide an open-source stack for…
"The IPO window is open and we're advising companies to go public." @rick joined @ScottWapnerCNBC on Closing Bell recently to share his views on the state of IPO market and why we're in for an incredibly exciting second half to the year. ⬇️
Excited to see @rick, @derek_chu, and @kathrynweinmann featured as top VCs investing in the creator economy. We couldn't be more excited about backing the next generation of iconic creator companies, including @synthesiaIO, @shoponpickle, @poshvip_ and more!…

Matt Turck @mattturck
124K Followers 2K Following VC at @FirstMarkCap. I'm a VC, so of course I have a podcast: https://t.co/Usnenl0zfI
Nicole DeTommaso 🪄 @nic_detommaso
74K Followers 560 Following Tweet about All Things VC. Providing insights to demystify the industry🪄. Investor @HarlemCapital | @Columbia alum
Mac The VC @MacConwell
99K Followers 40K Following Managing Partner @RareBreedVC | underrepresented founders | Hacker turned Hustler | Entrepreneur | Vampire | Former Gamer | @inside | @KauffmanFellows class #26
Rex Woodbury @rex_woodbury
39K Followers 1K Following Building @Daybreak_Fund. Prev @IndexVentures. Writing about how technology & people intersect at https://t.co/LMdIBPFx8A. Investing at Pre-Seed, Seed.
Caroline Casson @carolinecasson_
12K Followers 2K Following VC + angel investor 💼 • golfer ⛳️ • adventurer 🌏 • wife to @tom_casson 💍 • mom to charlotte + chloe 👯♀️ + sailor 🐶
Jarrid Tingle @jarridvtingle
28K Followers 849 Following Building the Motown of VC @HarlemCapital. I tweet about VC, business lessons, and equality.
jess lozano schmitt @JessLozanoS
39K Followers 5K Following ~something new~ prev. airplanes @JetBlueVentures | MSc Business Analytics | all opinions are (unfortunately) my own
Christine Concepción @ChristineIsGood
4K Followers 536 Following Managing Director VC | NYC @Columbia_Biz MBA | @Columbia BA | 🏳️🌈 all opinions are my own 🥥 🌴
Trace Cohen @Trace_Cohen
21K Followers 10K Following Six Point Ventures pre/seed fund focused on Vertical Ai 🤖 // Angel in 30+ 😇 // My weekly startup tech VC newsletter 📝 👇
Lisa Xu @lisamxu
4K Followers 1K Following Partner @thresholdvc investing in early stage startups // alum @FirstMarkCap @onepeloton @Handy @BainandCompany @Wharton // #longNYC 🗽
SeeuferTräume @xn349GvlMvdg6Q
8 Followers 354 Following
Elijah (Ilya) Yermola... @EYermolaev
6 Followers 75 Following Investor Relations | VC & Private Equity | ex-HBD | Web3 | TG: @EYermolaev
CMA AI @cma__ai
8 Followers 198 Following
HYPERwallet.hl @HYPERwalletCom
619 Followers 2K Following Full Stack AI High Yield Perpetuals Exchange Router HYPERwallet poweredby @HyperliquidX https://t.co/mJniCUaXtA 💬twitsby No1.hl🇯🇵founder
Wisdom Trader (Sylvai... @lan32603
1K Followers 7K Following “Youngest Head Trader in Country (Bond trader) ex- CIO | Sharing Insights Watch Rick Santelli on CNBC for bonds
004Anshuman @yours_Anshuman
108 Followers 3K Following
cяyρτσ @crypt2013
13K Followers 14K Following Influencer and marketing strategist, specializing in promotions, campaign management, and social media growth. #crypto #bitcoin #Ethereum #solana
Samuel Maslin @SamuelMaslin
12 Followers 126 Following
Arnorirjo @Arnorirjo35701
83 Followers 2K Following
Zarathustra 🏔️ @liberatioli
53 Followers 777 Following Wertkonservativ Libertär Progressiv Christlich Agnostisch Nietzscheaner Tech-Unternehmer Komponist Freizeitphilosoph
Keven Do Nascimento @buildthevault
8 Followers 92 Following Founder @ LIMO 🚘 | Reinventing luxury mobility
Rithvik Pogaku @PogakuRithvik
2 Followers 120 Following
Lorenzo Bolognini @loribolo
642 Followers 2K Following 🚀 Fractional CMO. Growth Marketing. I help B2B startup founders generate leads and accelerate pipeline. Ask me how.
Anhedonia @niyor060
42 Followers 2K Following Melancholia @MIT @Stanford @CarnegieMellon @ETH_en @NUSingapore Cooking AI🧠, Robots🤖 and VR🥽
Aditya Kulkarni @adikulkarni_1
4 Followers 177 Following
Philip Decker @philip0x
874 Followers 1K Following Emerging Payments @americanexpress. The crazy one pushing crypto at the blue box. NFA and opinions are my own.
Ishika Mittal @imittalishika
2K Followers 446 Following Comp Eng @UofT | Building @Vendors.ca | Fellow @joinodf | Cansbridge fellow’24 | Winner @Stanford Hackathon | SDE @amazon | AI engineer @Flicfit Japan
Frank Bjarke Pedersen @BjarkeFran97337
2 Followers 9 Following
Alex Tenebrice chaos @ChaosTenebrice
17 Followers 218 Following
Lungelo Sigudla @lungelosigudla
8 Followers 262 Following
Mauricio Clavel @Maclavelg
17 Followers 281 Following
Ali Usman – Founder... @Ali_wecommerce
6 Followers 137 Following 🚀 Serial Entrepreneur | AI & Tech Innovation | 🇵🇰 Pakistan | Proved 7 startups in 7 days possible | Building the impossible daily
Heather - Learn Heal ... @LearnHealGrow24
198 Followers 3K Following
Lamanda Ballard @lamandamb
15 Followers 174 Following CEO, Founder @FloEverHealth · Closing the hormone health gap for 40M women with predictive AI, diagnostics, and inclusive care
David John @tinkeringDavid
223 Followers 2K Following Researcher at Center of Educational Technology, IIT Bombay
QMB Blockchain @qmbchain
22 Followers 506 Following Eco-friendly, ultra-fast blockchain | PoA + DPoS mesh consensus | Modular DeFi, NFT, DID | Governed by you | Join the green revolution
Prisen.co @prisencotech
46 Followers 169 Following Experienced Startup Dev. Available for contracts.
vCom Solutions @vComSolutions
460 Followers 348 Following One powerful place to buy, manage and pay for your corporate technology. #ITmanagement #Network #Mobile #SaaS #Cloud #AI #MSP
Mj07 @M0seMj
1K Followers 1K Following Self-taught software developer,Founder building an AI-powered future, Scientist
gleam @gleamxlabs
130 Followers 2K Following Bringing the vibes to note taking - https://t.co/3wqvZU1qD3
Mehir Un Nisa @mehir45783
3 Followers 33 Following
Search Cloud One @searchcloudone
245 Followers 1K Following Search as a Service. #Search #cloud. We love everything in the cloud - the sky is not the limit 🚀 #eSearchPro #AI #saas #sitesearch #WordPress
Avicenna @KarmanKekana
43 Followers 411 Following @metasapien_io | debugging human souls with @wiintaX
Polat Efe Kaya @PolatEfeK
26 Followers 174 Following Founder of @neavents_tr | Software Developer | Backend
Rob McMahon 🚀🇺�... @RobMcMa34474479
431 Followers 2K Following Husband & Father of 2 Founder & CEO @ https://t.co/R3ZuVtj1pY Co-Founder & CEO @ Infinite Data Solutions Aspiring Guitarist, Golfer, & Physics Nerd, etc.
AVV @avv_co
95 Followers 532 Following Early stage venture capital firm. Subscribe to The Ascent: https://t.co/hBVRkEHcCR
Yoni Nachmany (he/him... @YoniNachmany
677 Followers 264 Following Research Engineer // prev: @myzeusai @linuxfoundation @nytimesrd @mapbox
Matt Turck @mattturck
124K Followers 2K Following VC at @FirstMarkCap. I'm a VC, so of course I have a podcast: https://t.co/Usnenl0zfI
Harry Stebbings @HarryStebbings
294K Followers 364 Following 🎤 @twentyminutevc, 🏦 @20vcfund, @projecteurope_😇 @perplexity_ai @linear @fyxerai @tripledotgames @lovable_dev @airwallex @mercor_ai @getcaptionsapp
Jason ✨👾SaaStr.A... @jasonlk
214K Followers 2K Following GET funded ➡ $200m https://t.co/AVvPIrIdFP🦄🦄🦄🦄🦄🦄 LEARN GTM ➡ https://t.co/X23R2qMajX CHAT with my clone ▶ https://t.co/bwkZCtvqlr Founder/ceo #AdobeSign
Jenny Fielding @jefielding
40K Followers 3K Following Managing Partner, @EverywhereVC investing in pre-seed founders building the future of money, health and work 🚀
Tweets from Zach Wein... @zachweinberg
75K Followers 423 Following I do healthcare & tech stuff. Founder of https://t.co/uJTXjZVNJt, Flatiron Health (acq @Roche~$2b) & Invite Media (acq @Google~$81m). Invest @ https://t.co/2D00yW2Be4
logan bartlett @loganbartlett
63K Followers 897 Following md @redpoint / I have a podcast @loganbartshow / mostly tech with some vols, knicks and hip hop tweeting mixed in
martin_casado @martin_casado
68K Followers 3K Following GP @ a16z ... questionable heuristics in a grossly underdetermined world
Alex Konrad @alexrkonrad
86K Followers 4K Following Founder and editor of @upstartsmediaco, a new tech publication focused on the startup ecosystem. Previously @Forbes senior editor. Email: [email protected]
sarah guo @saranormous
119K Followers 3K Following startup investor/helper, founder @conviction. accelerating AI adoption, interested in progress. tech podcast: @nopriorspod
Lisa Xu @lisamxu
4K Followers 1K Following Partner @thresholdvc investing in early stage startups // alum @FirstMarkCap @onepeloton @Handy @BainandCompany @Wharton // #longNYC 🗽
Serena Williams @serenawilliams
10.2M Followers 369 Following Tennis Player turned VC Investor @SerenaVentures founder & entrepreneur
Beth Viner @bviner
686 Followers 226 Following Partner and Head of Platform @FirstMarkCap; @bcg, @kickstarter and @IDEO alumni, early bird, book lover, abandoner of high heels for sneakers
VentureBeat @VentureBeat
706K Followers 2K Following Obsessed with covering transformative technology.
Business Insider @BusinessInsider
4.1M Followers 401 Following What you want to know about business. Love Business Insider? Add us as a preferred source on Google.
Vera @vverawang
697 Followers 457 Following growth investor @firstmarkcap! / prev. silver lake, evercore, @columbia
The Information @theinformation
120K Followers 704 Following The most authoritative publication covering tech that high-powered tech execs and founders read daily. TITV M-F at 1 ET: https://t.co/M0NywExhuj
LM Studio @lmstudio
38K Followers 121 Following Download and run local LLMs on your computer 👾 https://t.co/e2E0DLMFJ5
TensorZero @TensorZero
1K Followers 2 Following open-source stack for industrial-grade LLM applications ⤷ gateway · observability · optimization · evaluation · experimentation
Viraj Mehta @thebigmehtaphor
632 Followers 490 Following cofounder and cto @tensorzero. previously did a PhD at CMU doing sample efficient reinforcement learning for tokamaks and math and cs @stanford before that
Gabriel Bianconi @gabrielbianconi
3K Followers 188 Following ceo @tensorzero · open-source stack for industrial-grade LLM applications
Function Health @function
20K Followers 7 Following One mission — 100 healthy years. Access 160+ lab tests, advanced imaging, and expert insights.
Kathryn Weinmann @kathrynweinmann
93 Followers 262 Following
Moiz virani @moizjv
459 Followers 859 Following Co-founder @dealmomentum. Past @blamelesshq,@saucelabs
sridhar @RamaswmySridhar
29K Followers 617 Following CEO @snowflake; founder @neeva Ex-@GreylockVC Ex-@Google SVP of Ads Ex-@BellLabs.
Brendan Humphreys @brendanh
558 Followers 437 Following Head of Engineering @ Canva. Cryptic crossword tragic. Want a better world for my two kids.
Romain Niccoli @romain_n
810 Followers 405 Following co-CEO & co-founder at Pigment. Ex CTO & co-founder @criteo and Less
CNBC's Fast Money @CNBCFastMoney
455K Followers 2K Following Fast Money with @MelissaLeeCNBC airs weeknights at 5P ET, only on @CNBC and streaming on CNBC+. America's post-market show.
Michael Rubenstein @mrubenstein99
5K Followers 588 Following Co-Founder & Co-CEO at Firsthand. Previously President at AppNexus/Xandr, Founder/GM at DoubleClick/Google, #dadvocate
Firsthand @FirsthandLabs
70 Followers 1 Following Firsthand Brand Agents dynamically deliver your knowledge wherever consumers need it, in the moments that matter.
Sparta @SpartaCommo
2K Followers 288 Following For traders who want to anticipate future pricing trends and seize opportunities, Sparta provides real-time, actionable market intelligence.
Arnav Bimbhet @abimbhet
328 Followers 791 Following Partner @FirstMarkCap. Ex @ICONIQGrowth - fly on the wall @snowflakeDB @datadoghq @mirohq @fivetran @hashicorp @collibra @hightouchdata @dataiku @getreprise
jamiegoldstein @jamieagoldstein
3K Followers 1K Following @Pillar_VC Founder & Partner. Avid fan of anything involving a mountain. Husband to jgoldstein + dad of three amazing boys.
Alaffia Health @Alaffiahealth
20 Followers 1 Following At Alaffia Health, we partner with health insurance payers to lower healthcare costs by eliminating overpayments.
H @hcompany_ai
19K Followers 61 Following Forging Superintelligence. Putting AI to work for you, with #RunnerH sparking the agentic AI revolution.
Laurent Sifre @laurentsifre
3K Followers 457 Following Co-founder & CTO @hcompany_ai. Previously, research scientist @GoogleDeepMind - AlphaGo, AlphaFold, AlphaStar, Chinchilla, Gemini, Gemma.
WRITER @Get_Writer
8K Followers 37 Following WRITER is where the world’s leading enterprises orchestrate AI-powered work | Dream Big, Build Fast | Fueled by our Palmyra LLMs
Nicholas Carlson @nichcarlson
35K Followers 796 Following CEO, EIC, and Production Assistant at Dynamo
Alex 🦅 Eagle @Jakeherringbone
5K Followers 454 Following Enable faster Build&Test with 🌿Bazel https://t.co/tX0ypSyIeS
Aspect Build @aspect_build
113 Followers 185 Following Fast, Scalable, Developer Workflows and Infrastructure for Bazel
Crisp Data Platform @Go_Crisp
95 Followers 177 Following Crisp leverages the cloud to connect and analyze retail data sources in real-time, providing you with meaningful insights and trends for your business.
Dan Primack @danprimack
156K Followers 5K Following Biz editor @Axios. Pro Rata newsletter. [email protected]. Native Masshole. DM for Signal/Telegram.
Jefferies @Jefferies
11K Followers 48 Following Jefferies, the global investment banking firm serving clients for more than 60 years. Follow us for company news and economic insights.
Ashley Wilson @awilson820
572 Followers 327 Following Co-founder, COO @dealmomentum. Founder @olivineagency. Singer & songwriter. Trying to stay in balance and in tune.
Momentum @dealmomentum
250 Followers 123 Following Momentum’s AI Agents work alongside your GTM Team to close deals and expand business—all seamlessly integrated into your workflow.
Santiago Suarez Ordo�... @santiycr
1K Followers 290 Following CEO of @dealmomentum. I love building products. I spend a lot of my time learning and I try to help others.