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 (662)
- News
Qualys CEO Sumedh Thakar Unloads Shares as Q4 Earnings Beat Expectations — A Strategic 10b5-1 Exit
Qualys CEO Sumedh Thakar executes a planned 10b5-1 sale in early 2026, coinciding with a record-setting Q4 earnings report that saw the cybersecurity leader beat analyst expectations.
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Equinix Executive Chairman Charles Meyers Sells $1.6M Following Leadership Transition and Strong Q4 Earnings
Equinix Executive Chairman Charles Meyers continues systematic 10b5-1 sales as he transitions leadership roles, amid record-breaking data center demand.
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Adobe CEO Shantanu Narayen Sells $506M in Stock Following Retirement Announcement — The AI Exit of an 18-Year Tenure
Adobe's record-setting CEO Shantanu Narayen unloads a massive $506 million position as he prepares to step down, signaling the end of an era for the creative software giant.
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Leggett & Platt Insider Karl Glassman Discloses $22M Activity Following Recent Dividend Cut
Karl Glassman, a major insider at Leggett & Platt, has disclosed a series of transactions totaling $22.4 million as the company navigates a major strategic shift and dividend reduction.
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VeriFone Director Barry Zwarenstein Continues Systematic Sales Amid Post-Rally Volatility
VeriFone director Barry Zwarenstein has executed another round of systematic sales, bringing his total proceeds to over $85 million as the company's ownership structure evolves.
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First Solar Director Michael Ahearn Offloads $740M in Massive Multi-Year Exit
One of First Solar's most prominent insiders, Michael Ahearn, has completed one of the largest insider selling campaigns in recent memory, totaling over $740 million.
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Murray Stahl Kept Buying RENN Fund Into March: Why a Tiny Insider Buy Can Still Matter
Horizon Kinetics co-founder Murray Stahl kept adding RENN Fund shares in late March 2026. The dollars were small, but the setup matters because he sits at the center of the funds strategy, board, and ownership story.
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Two Protagonist Therapeutics Insiders Sold More Than $8M as Trial Milestones Moved the Story Forward
Two Protagonist Therapeutics insiders sold more than $8M of PTGX stock in late March as the biotech moved deeper into a milestone-rich phase with regulatory and trial catalysts ahead.
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Tempus AI CEO Eric Lefkofsky Sold $7.7M in March as 2026 Growth Expectations Stayed Hot
Tempus AI CEO Eric Lefkofsky sold roughly $7.7M of TEM stock in late March, but the transaction landed while Tempus was still carrying strong 2026 growth expectations and heavy analyst attention.
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PBF Energy Chairman Thomas Nimbley Sold $2.6M After an Option Exercise as Refining Margins Recovered
PBF Energy chairman Thomas Nimbley sold about $2.6M of stock after exercising options, a filing that arrived as PBF talked about better gross refining margins and a Martinez restart.
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Klaviyos Andrew Bialecki Sold $3.6M in Class A Shares but Kept His Control Stake
Klaviyo co-founder Andrew Bialecki sold $3.6M of Class A shares in March, but the filing still showed a dominant control position through other share classes and structures.
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Barry Dillers IAC Bought $37.2M of MGM Stock in Two Days
IAC bought roughly $37.2M of MGM stock across two March filings, extending Barry Dillers long-running accumulation into a period of improving BetMGM and 2026 optimism.
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HPE CEO Antonio Neri Sold $6.7M as Juniper Integration and AI Networking Took Center Stage
HPE CEO Antonio Neri sold about $6.7M of stock in late March while HPE was balancing Juniper integration, AI-networking ambitions, and a cost-reset story.
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Gap CEO Horacio Barbeito Sold $2.7M After Gaps 2026 Outlook Framed the Next Turnaround Phase
Gap CEO Horacio Barbeito sold roughly $2.7M of stock in March just after Gap outlined its 2026 priorities around Old Navy, new store formats, and the next stage of its brand reset.
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Guidewire Stock Rallied on Raised FY2026 Outlook. Why Did James Winston King Sell Again?
James Winston King's March 2026 GWRE sale followed Guidewire's stronger outlook and cloud momentum, adding a fresh insider signal during a fast rerating phase.
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$1.0M in FFIV Stock Sold by CEO François Locoh-Donou as F5 Pushes Its AI Security Platform
F5 CEO François Locoh-Donou disclosed a fresh March sale after the company raised FY2026 expectations and expanded its AI-era application security platform.
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Okta Co-Founder Todd McKinnon Sold $1.0M in Class A Shares — But Form 4 Still Shows a 6.38M Derivative Stake
Todd McKinnon's latest Okta sales came days after the company's FY2026 results, but Form 4 Table II still reports 6,383,887 derivative/indirect shares.
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Two Wayfair Co-Founders Sold Nearly $17M on the Same Days. Coincidence or 10b5-1 Cadence?
Wayfair co-founders Niraj Shah and Steven Conine executed near-identical stock sales on March 23-24, totaling about $8.4M each, after similar December waves.
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TMUS: CEO G. Michael Sievert Keeps a Quarterly Selling Cadence as Blocks Drop to 15,000 Shares
T-Mobile CEO G. Michael Sievert has continued a repeatable two-day selling cadence in TMUS, with block size stepping down from 22,500 shares in 2025 windows to 15,000 shares in February 2026.
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$10M PANW Insider Buy by CEO Nikesh Arora — A Rare Open-Market Reversal After September's $72.6M Sales
Palo Alto Networks CEO Nikesh Arora bought nearly $10.0M of PANW in the open market on March 27, a rare insider buy after heavy September selling at much higher prices.