Investment Portfolio

Portfolio
Dashboard

Three sleeves. Thematic equity, long-term retirement, and core ETF exposure. A documented investment process, built in public.

About

Hello, I'm Isaac Toffel, an Economics and Data Science student at Northeastern University. I'm currently in the midst of my first Co-op at State Street. I'm also pursuing the CFA designation, sitting for the first exam this fall.

This site is a live record of how I think about capital allocation. Working in finance has sharpened how I approach portfolio construction — not just which names to own, but how conviction gets sized, when a thesis should be updated, and what makes a reallocation defensible. The CFA process has pushed that further. The portfolio here is where those frameworks get applied directly.

The goal isn't to be right about every position. It's to be disciplined enough to know whether I was right for the right reasons. Each holding has a testable thesis, each sleeve has a role, and the site documents both. I think building a serious process early — rather than collecting interesting-sounding ideas — is what compounds over time. This is that attempt, in public.

Education

Northeastern University

Experience

State Street

Certification

CFA Level I Candidate

Framework

Portfolio as a System

This portfolio is built as a system, not a collection of disconnected ideas. Every position has a role, every sleeve has a job, and sizing reflects conviction, risk, time horizon, and how directly a name expresses the underlying theme. The goal is not to own a large number of interesting companies. The goal is to concentrate capital where the upside is asymmetric, the thesis is understandable, and the portfolio construction makes sense at the total-book level.

The portfolio is organized around three distinct functions. The first is a higher-conviction thematic sleeve, where capital is allocated to areas I believe can materially outperform over a multi-year horizon, especially where the market may still be underestimating the duration or breadth of the opportunity. The second is a retirement sleeve, which blends core market exposure with selective growth and measured speculative positions. The third is a cleaner ETF sleeve that provides broad exposure, keeps the portfolio grounded, and serves as a benchmark-aware core.

Position size is intentional. Larger weights are reserved for names that sit closest to the center of the thesis, where the business model, demand driver, and reason for owning it are most direct. Smaller weights are used for emerging ideas, more speculative expressions, or positions where the upside may be meaningful but the path is less certain. This means a 10% position is not just a stock I like more. It is a position that has earned a larger share of risk budget. A 1% to 3% position, by contrast, is often an option on being right without needing to underwrite full-size exposure on day one.

Diversification here is not simply sector diversification. It is diversification by driver, maturity, and expression. Two companies may both sit under an AI label while being exposed to very different parts of the value chain, different customers, different margin structures, and different failure modes. The same logic applies across defense, energy, fintech, and space. What matters is not whether names look different on the surface. What matters is whether they fail for the same reason.

The portfolio is meant to evolve. New positions have to earn their way in. Existing positions have to keep earning their size. I want the site to reflect not only what I own, but the logic that holds the portfolio together.

Process

Decision Log

This portfolio is managed as an ongoing decision process. The most important record is not the list of current holdings. It is the sequence of decisions that created them. The purpose of the decision log is to document that process clearly: when a position was initiated, why it was added, what changed afterward, and whether the original thesis is becoming more or less credible over time.

Every position begins with a reason to exist. That reason should be specific enough to test. A name is not added because a theme is popular or because price action is strong. It is added because I believe there is a definable source of future value creation, and because that exposure improves the portfolio relative to the alternatives. The first entry in the log should capture that plainly: why this company, why now, why in this sleeve, and why at this size.

After initiation, the log should track changes in the thesis rather than just changes in price. If revenue quality improves, if customer concentration worsens, if execution disappoints, if the competitive set changes, or if the market begins pricing in more of the upside, those developments matter more than whether the stock is up or down over a short period. The goal is to separate outcome from process. A position can be down while the thesis is improving, and it can be up while the thesis is deteriorating.

What each entry should answer

Add

What increased conviction — a development in the thesis, not price momentum.

Trim

Whether the driver was valuation, risk control, position sizing, or a better opportunity elsewhere.

Exit

What broke: the thesis, the sizing discipline, or the relative attractiveness of the idea.

Over time, the decision log becomes more valuable than the snapshot of the portfolio itself. It shows whether the process is consistent, whether conviction is earned or emotional, and whether capital is being reallocated for good reasons. It turns the portfolio from a static display into a live record of judgment.