About Coast Fibers
Coast Fibers plans to manufacture textiles in local facilities. The facilities will connect farmers directly to the products people buy. The company aims to make textiles that beat current alternatives on quality, price, and sustainability. Its founders have a background in flax and linen, and the site has a page on the linen supply chain.
Coast Fibers is based in San Francisco. William Altschwager, known as Will, is co-founder and chief executive officer, and a director. Angela Wartes-Kahl is co-founder and head of farming. Shannon Welsh is co-founder and head of operations. Altschwager worked at Nuveen on vineyard investments and was a vice president at Sixth Street Partners. Wartes-Kahl began growing fiber flax in 2011 and was co-founder and chief operating officer of Fibrevolution. Welsh also co-founded Fibrevolution.
Funding Rounds (SEC Form D)
| First sale | Filed with SEC | Amount sold | Investors | Avg. check | Terms | Filing |
|---|---|---|---|---|---|---|
| Oct 2, 2025 | Oct 9, 2025amended Oct 28, 2026 | $1,966,967of $4.0M target | 23 | $85,520 | EquityRule 506(b) | Form D/A ↗2 earlier filings |
First sale is the date the first investor in the offering committed to invest. Companies must file Form D within 15 days of that date, so filing dates run later.
Why Investors Backed Coast Fibers
Coast Fibers is a San Francisco company that plans to make textiles in facilities close to the farms that supply them. It has three co-founders with backgrounds in farming, agricultural investing, and fiber. Two of them co-founded Fibrevolution, a flax-to-linen effort in Oregon.
The problem it targets
Coast Fibers argues that fabric goes through avoidable steps between the farm and the buyer. In its view, extra shipping, processing, and markups push up costs and harm the environment. Its answer is to manufacture locally and cut those steps out.
What the product does
Coast Fibers' local facilities will connect farmers directly to the products people buy. Co-founder Shannon Welsh co-founded Fibrevolution to revive flax-to-linen production in Oregon. She continues that work at Coast Fibers.
Progress so far
The three co-founders arrive with farm and fiber experience. Angela Wartes-Kahl began growing fiber flax in 2011 on an organic farm in the Oregon Coast Range. She managed the fiber and textiles program at Oregon Tilth and was vice chair of the Organic Trade Association Fiber Council. Welsh held leadership roles with the North American Linen Association and the Pacific Northwest Fibershed. Altschwager comes from a third-generation farming family in South Australia. He earned a B.S. in Agricultural Business from Cal Poly, San Luis Obispo.
We wrote this summary from public statements by Coast Fibers and its investors. It is not investment advice.
Coast Fibers in the News
Leadership Team
Executive officers and directors listed on Coast Fibers's Form D filed Oct 28, 2026.