• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
NewslettersBroadsheet

How Thailand’s 2004 tsunami inspired one VC to raise a $50 million fund to invest in sustainability 

By
Emma Hinchliffe
Emma Hinchliffe
and
Joey Abrams
Joey Abrams
Down Arrow Button Icon
By
Emma Hinchliffe
Emma Hinchliffe
and
Joey Abrams
Joey Abrams
Down Arrow Button Icon
February 27, 2024, 9:07 AM ET
Sita Chantramonklasri, founder of Siam Capital.
Sita Chantramonklasri, founder of Siam Capital. Horacio Villalobos—Getty Images

Good morning, Broadsheet readers! The widow of an early Berkshire Hathaway investor donated $1 billion to the Albert Einstein College of Medicine, Warner Bros. woos back J.K. Rowling, and living through Thailand’s 2004 tsunami inspired one VC’s investment thesis. Have a thoughtful Tuesday.

– Sustainable investing. Sita Chantramonklasri “remember[s] every minute” of December 26, 2004. She was 12 years old, a student at a Bangkok international school. The Boxing Day tsunami that hit Thailand that day—and the uneven recovery that divided the “haves and have-nots”—is seared in her memory.

“We started hearing warnings all over the news and radio. I looked up what ‘tsunami’ even meant exactly,” Chantramonklasri remembers. Her typical drive to school passed high-rise apartments and brothels, and she saw how the privileged fared better in the disaster’s aftermath. “I didn’t understand how something could be so catastrophic that it could wipe away communities in an instant,” she says.

Today, Chantramonklasri is a New York-based investor behind the firm Siam Capital. Her firm invests in companies at the intersection of sustainability and consumer infrastructure—and her experiences growing up in Thailand informed that investment thesis. “I realized the vast impact of climate events, not just on the natural landscape, but on people,” she says. In addition to her experience in 2004, Chantramonklasri spent her youth observing her father’s work in the energy sector, visiting both oil rigs and solar farms.

Sita Chantramonklasri, founder of Siam Capital.
Horacio Villalobos—Getty Images

As a solo GP, she raised almost $50 million for her firm’s first fund; the firm has deployed $43.8 million of that capital. Its investments include the biotech company Helaina (which started as an infant nutrition startup), the product development marketplace Novi, and the food and beverage brand platform Tomorrow Farms. Her second vehicle now counts Kasikorn Bank, one of Thailand’s largest banks, as an investor.

An Uber and Goldman Sachs alum, she founded her own firm after working for Twitter cofounder Biz Stone’s VC firm Future Positive. She identified sustainability as her interest and refined a thesis. “It felt like people investing in sustainability were working at it from a nonprofit lens,” she says. She wanted to invest for long-term returns. Her answer was a consumer focus; her fund has backed startups that build an “infrastructure layer” to help companies meet demand as consumer habits change because of environmental and economic pressures. What people buy, how they spend their time, and what services they use will all be affected by the future of the planet, she argues.

Chantramonklasri doesn’t consider Siam to be a climate tech firm, and she cautions others in the space to move deliberately. “There’s almost an urgency to deploy solutions,” she says. “I’m scared we’re starting to see technologies being funded that aren’t necessarily the best ideas for venture funding. A lot of these ideas need to exist, but not all of them can generate venture-like returns.”

Emma Hinchliffe
emma.hinchliffe@fortune.com
@_emmahinchliffe

The Broadsheet is Fortune’s newsletter for and about the world’s most powerful women. Today’s edition was curated by Joseph Abrams. Subscribe here.

ALSO IN THE HEADLINES

- Free for all. A former pediatrics professor and current trustee at the Bronx’s Albert Einstein College of Medicine donated $1 billion to the school to ensure free tuition for all future students. The donation from Ruth Gottesman, the widow of an early Berkshire Hathaway investor, will be used to “attract a talented and diverse pool of individuals who may not otherwise have the means to pursue a medical education,” the school said. Fortune

- Rowling returns. Warner Bros. CEO David Zaslav took it upon himself to woo Harry Potter author J.K. Rowling back to the studio after it distanced itself from her following controversial remarks about the transgender community. With Rowling now involved in an upcoming Harry Potter TV series, the studio seems ready to reconcile with the author who wields enormous power over the IP of the series she created. Wall Street Journal

- A league of their own. The inaugural season of what is believed to be the first professional softball league in Latin America is underway, reflecting the growing popularity of women’s sports in the region. The Mexico-based league is already drawing tens of thousands of spectators to watch female players who previously had to leave the country to compete professionally. The New York Times

- Hello lifeline. Candle Media has hired investment bank Moelis & Co. to revive Hello Sunshine, the women-centered media company founded by Reese Witherspoon. Sources say the bank is focused on expansion after Hello Sunshine fell short of the $80 million in profits it projected last year. Puck

- Racing from restrictions. Women in Alabama are rushing to move their frozen embryos out of state after an Alabama Supreme Court ruling threatened in vitro fertilization there last week. Transport is expensive and risks the viability of the embryos many women believe to be their last hope of a pregnancy. The Cut

MOVERS AND SHAKERS: Walgreens Boots Alliance hired Lanesha Minnix as executive vice president and global chief legal officer. Supergoop! named former JLo Beauty CEO Lisa Sequino as its new chief executive officer.

ON MY RADAR

Fran Drescher on what’s lost when Hollywood’s so beholden to shareholders Vanity Fair

Mindy Kaling on egg freezing and advice from Oprah The Wall Street Journal

One of the last abortion doctors in Indiana The New Yorker

PARTING WORDS

"I don’t know why our ability to connect with people all around the world hasn’t translated yet to more global kindness."

—Activist and writer Monica Lewinsky, the face of a new Reformation campaign, on the internet's ability to both isolate and connect people

This is the web version of The Broadsheet, a daily newsletter for and about the world’s most powerful women. Sign up to get it delivered free to your inbox.

About the Authors
Emma Hinchliffe
By Emma HinchliffeMost Powerful Women Editor
LinkedIn iconTwitter icon

Emma Hinchliffe is Fortune’s Most Powerful Women editor, overseeing editorial for the longstanding franchise. As a senior writer at Fortune, Emma has covered women in business and gender-lens news across business, politics, and culture. She is the lead author of the Most Powerful Women Daily newsletter (formerly the Broadsheet), Fortune’s daily missive for and about the women leading the business world.

See full bioRight Arrow Button Icon
By Joey AbramsAssociate Production Editor

Joey Abrams is the associate production editor at Fortune.

See full bioRight Arrow Button Icon

Latest in Newsletters

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Newsletters

Dow COO Karen Carter wearing a white lab coat and sitting while smiling
NewslettersMPW Daily
What to know about Dow’s next CEO, the Fortune 500’s third Black female chief today who started at the $40 billion chemical maker as an intern
By Emma HinchliffeApril 15, 2026
4 hours ago
Why insurance giant Travelers’ CTO is placing fewer, bigger bets on AI
NewslettersCIO Intelligence
Why insurance giant Travelers’ CTO is placing fewer, bigger bets on AI
By John KellApril 15, 2026
5 hours ago
In this photo illustration, the American multinational investment bank, Citibank or Citi (NYSE: C), logo seen displayed on a smartphone with an Artificial intelligence (AI) chip and symbol in the background.
NewslettersCFO Daily
Citi’s new CFO touts AI gains as bank posts record $24.6 billion revenue quarter: ‘This is not the spell-checker working better’
By Sheryl EstradaApril 15, 2026
7 hours ago
Dow’s next chapter depends on whether new CEO Karen Carter gets room to lead—and how fast Jim Fitterling steps back
NewslettersCEO Daily
Dow’s next chapter depends on whether new CEO Karen Carter gets room to lead—and how fast Jim Fitterling steps back
By Diane BradyApril 15, 2026
9 hours ago
Mike Horton poses with his arms crossed.
NewslettersTerm Sheet
Exclusive: Hyfix raises $15 million to build a U.S. alternative to DJI’s drone dominance
By Lily Mae LazarusApril 15, 2026
9 hours ago
A ULA Atlas V-551 rocket lifts off with 27 new Amazon Leo satellites from Cape Canaveral Space Force Station in Florida on December 14, 2025. (Photo: Manuel Mazzanti/NurPhoto/Getty Images)
NewslettersFortune Tech
Why Amazon bought Globalstar for $11.6 billion
By Andrew NuscaApril 15, 2026
10 hours ago

Most Popular

Billionaire philanthropist MacKenzie Scott has donated again—a week after gifting millions to a college, she's just given $70 million to Meals on Wheels America
Success
Billionaire philanthropist MacKenzie Scott has donated again—a week after gifting millions to a college, she's just given $70 million to Meals on Wheels America
By Fortune EditorsApril 13, 2026
2 days ago
Retirees are facing a $345,000 bill they never saw coming — and most aren't prepared
Commentary
Retirees are facing a $345,000 bill they never saw coming — and most aren't prepared
By Fortune EditorsApril 14, 2026
1 day ago
Palantir CEO says working at his $316 billion software company is better than a degree from Harvard or Yale: ‘No one cares about the other stuff’
Success
Palantir CEO says working at his $316 billion software company is better than a degree from Harvard or Yale: ‘No one cares about the other stuff’
By Fortune EditorsApril 14, 2026
1 day ago
Warren Buffett’s first tax return showed $7 owed to the IRS. The then paperboy and former Berkshire Hathaway CEO is now worth $143 billion
Success
Warren Buffett’s first tax return showed $7 owed to the IRS. The then paperboy and former Berkshire Hathaway CEO is now worth $143 billion
By Fortune EditorsApril 14, 2026
1 day ago
Jeff Bezos pledged $10 billion for climate change. With the 2030 clock ticking, his wife, Lauren Sánchez Bezos, is leading the charge to spend it
Environment
Jeff Bezos pledged $10 billion for climate change. With the 2030 clock ticking, his wife, Lauren Sánchez Bezos, is leading the charge to spend it
By Fortune EditorsApril 15, 2026
5 hours ago
Anthropic is facing a wave of user backlash over reports of performance issues with its Claude AI chatbot
AI
Anthropic is facing a wave of user backlash over reports of performance issues with its Claude AI chatbot
By Fortune EditorsApril 14, 2026
1 day ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.