Alex Rivera
Breaking News Editor
Breaking News Editor at 13F Insight. First to report on major SEC filings, institutional moves, and regulatory developments.
A note from Alex
Hey, I'm Alex. I spent three and a half years at Bloomberg writing breaking-news pieces about the kind of trades that move tickers in after-hours, and what I learned is that the news cycle moves a lot faster than the explanations do.
That's the gap I'm here to close. When a major insider files a Form 4 at 4:31pm, you should know about it by 5:00 — not in tomorrow's morning newsletter. And you should know what's actually new about it, not just that it happened.
I'll keep my pieces short, my numbers exact, and my opinions out of the lede. If something I wrote ages badly, I'll say so on the record.
Articles by Alex Rivera (827)
- News
Arista CEO Jayshree Ullal Sells $216M in ANET Stock
Arista Networks CEO Jayshree Ullal sold about $216 million of stock across five sessions in April 2026 under a 10b5-1 plan, then exercised options in May — while remaining a major holder.
- News
Monolithic Power Founder Hsing Sells $59.3M in MPWR
Monolithic Power founder-CEO Michael Hsing sold $59.3 million of stock in a single session on May 18, 2026 under a 10b5-1 plan, cashing in on the AI power-chip rally near $1,500 a share.
- News
CrowdStrike CEO Kurtz Sells $20.8M in CRWD Into Rally
CrowdStrike CEO George Kurtz sold about $20.8 million of stock across May 2026 under a 10b5-1 plan, with the prearranged trades capturing a sharp rally toward fresh highs.
- News
Morningstar Founder Mansueto Keeps Trimming, Still Owns 37%
Morningstar Executive Chairman Joe Mansueto sold ~$3.72M in MORN in mid-May 2026 under a 10b5-1 plan, but still controls about 37.5% of the company.
- News
Cloudflare's Co-Founders Keep Selling Into the AI Story
Cloudflare President Michelle Zatlyn sold ~$92.7M over six months alongside CEO Matthew Prince's ~$187.3M — structured founder selling as AI demand accelerates.
- News
Arista's CEO and CTO Sell Into the AI Networking Boom
Arista Networks CEO Jayshree Ullal and CTO Kenneth Duda both exercised options and sold in May 2026 — plan-driven sales as the company doubled its AI revenue target.
- News
Bezos Gifts $311M in Amazon Stock - and Why It's Not a Sale
Jeff Bezos transferred more than 1.25 million Amazon shares in early May 2026, worth roughly $311 million. The Form 4 codes them as gifts, not sales - a distinction that matters for how you read the filing.
- News
Tim Cook's April 2026 AAPL Sale: An RSU Vest, Not a Signal
Apple CEO Tim Cook sold $16.5 million of AAPL on April 2, 2026 under a prearranged 10b5-1 plan - the net shares from a routine annual RSU vesting, not a discretionary bet. He still holds about 3.3 million shares.
- News
Zoom Founder Yuan Sells $7M ZM Amid AI Reacceleration
Zoom founder Eric Yuan sold about $7 million of ZM in April 2026 through a convert-and-sell, keeping roughly 20.75 million shares, as the company's AI Companion adoption surged and growth began reaccelerating toward a $5 billion target.
- News
CoreWeave Cofounder McBee Sells $32M CRWV Block
CoreWeave co-founder Brannin McBee sold $32 million of CRWV in a single late-April 2026 block, his largest disclosed sale, even as the Nvidia-backed AI cloud posted a record quarter and a near-$100 billion backlog. He still holds a 4.1% stake.
- News
CrowdStrike CEO Kurtz Trims $5M CRWD Near Record Highs
CrowdStrike founder George Kurtz sold roughly $5 million of CRWD in a steady mid-May 2026 drip near record highs, weeks after the company crossed $5.25 billion in annual recurring revenue. The Form 4 cadence points to a plan, not a pivot.
- News
UTHR CEO Rothblatt Sells $5M Stock After Pipeline Wins
United Therapeutics founder Martine Rothblatt exercised long-dated options and sold $5.4 million of UTHR on May 21, 2026, days after back-to-back late-stage trial wins that underpin the company's path to $8 billion in peak revenue.
- News
Datadog Cofounder Le-Quoc Sells $9M DDOG After Raise
Datadog co-founder and CTO Alexis Le-Quoc sold roughly $9 million of DDOG on May 18, 2026, just weeks after the company posted its first billion-dollar quarter and lifted its 2026 revenue outlook on AI observability demand.
- News
Roku CEO Wood Sells $10M ROKU, Keeps 16M Class B Shares
Roku founder Anthony Wood sold roughly $10 million of ROKU on May 11, 2026 through a convert-and-sell, but his Form 4 shows he retains 16.2 million Class B shares and the voting control that comes with them — just as Roku swung to profitability.
- News
Monolithic Power CEO Hsing Sells $59M as MPWR Tops $1,500
Monolithic Power founder Michael Hsing sold 40,000 MPWR shares for $59.3 million on May 18, 2026, near record highs, days after AI data-center demand drove enterprise revenue up nearly 98% year over year.
- News
Cloudflare CEO Prince Sells $33M in NET Amid AI Pivot
Cloudflare co-founder Matthew Prince sold roughly $33 million of NET stock across three sessions in May 2026, days after the company cut 20% of staff to chase an AI-first model. The Form 4 cadence — and his retained 7%+ stake — tell the fuller story.
- News
Arista CEO Ullal Sells $120M in ANET as AI Outlook Rises
Arista Networks chief Jayshree Ullal sold more than $120 million of ANET stock across April 2026 even as the company lifted its 2026 AI networking forecast to $3.25 billion. Here is what the Form 4 cadence reveals.