Bullpen.News From Edwin Dorsey
Get Daily Recap Feedback

Friday, October 30, 2026

Back to today

From X

@convequity 1 click

Convequity on X

Anthropic and Binance show why the speed of containment matters. Cathedral, an AI security startup, says its agents found routes into Anthropic's internal messages and employee records by exploiting third-party business software during a security test. Anthropic acknowledged limited sales, HR and IT exposure, but says its model weights and code were safe, its monitoring caught some activity, and access was cut the same day. I lean toward Cathedral on the significance of that exposure. Internal information can help attackers impersonate colleagues and target people with privileged access. The damage can extend beyond the data initially exposed. Supply-chain risk becomes harder to contain as more tools and agents gain access to company systems. Tighter permissions should help. Building more tools internally might reduce vendor exposure, but it also transfers maintenance and security work to your own team. Binance's October 29 hack involved a different suspected entry point. Its preliminary investigation says a compromised DevOps engineer's laptop may have let an attacker reach an internal service and submit unauthorized withdrawals. Binance estimates a $6.3bn impact, with roughly $3bn frozen so far. An attacker using a trusted employee's access can cause damage without any malicious insider. And TRM Labs says most of the funds leaving Binance moved in about 20 minutes. That is why I think shift-right security becomes increasingly important: detecting and stopping attacks while systems are running. Security teams need to recognize lateral movement, where an attacker moves between accounts or machines, and contain it before the attacker reaches systems that can cause much greater damage. This is part of why we like Palo Alto Networks ($PANW). Cortex combines network, endpoint and cloud data with response controls, including the ability to isolate compromised devices. Connecting an investigation to an action that stops the attack matters when the attacker can move this quickly. It also makes cybersecurity an interesting market for premium-speed AI inference. An AI security agent needs to investigate accurately and act quickly, with current data and permission to intervene. Where the model's reasoning time is delaying containment, paying even 100x more per inference call could make economic sense if the reduction in expected losses exceeds the extra cost. Faster inference becomes valuable when it lets the defender stop an attack sooner without sacrificing accuracy.

Investor Letters

All letters

SNY Earnings Review

Sanofi raised FY26 guidance after Q3 sales grew 14.3% at constant currency, led by 34.8% Dupixent growth; vaccines declined 6.6%.

SNY $108B
Cestrian Capital Research 1 click

TSOH Weekly Roundup (10/30/2026)

Markel spent $315 million repurchasing shares in Q3 as Thrive agreed to buy ADT for $7.6 billion and Hasbro cited rising adult toy demand.

MKL $23B
TSOH Investment Research 1 click
WDAY · long

Workday INC

Workday shares have declined since February 2024 as the market has turned against SaaS stocks.

WDAY $48B
Value Investors Club 1 click

Celsius: The Pepsi Put

Celsius holds 20% of the U.S. energy-drink market and 40% of sugar-free sales, but its $1.65 billion Alani acquisition complicates…

PEP $187B
TSOH Investment Research 8 clicks

AppLovin Deep Dive: Not A No Brainer

AppLovin is down 48% YTD after its first guidance miss, with revenue 1% below expectations and EPS 2.5% short, reviving fears of an adtech…

APP $80B
Capitalist Letters 7 clicks

Amazon’s AI Economics

Amazon combines AWS AI infrastructure, model-company stakes and retail automation, with AWS targeting $1 trillion in annual revenue over…

AMZN $2.9T
Modern Value Investing 8 clicks

Publications we follow

Every publication on this site, hand-picked.

129 publications

Newsletters 109

YouTube 4

Blogs 15

Seeking Alpha 69 of 272

Nominate a publication

X accounts we follow

Every account on this site, hand-picked.

91 accounts
Nominate an account

Investor letters we follow

190 firms

Sectors

Ordered by how often our editor reaches for them.