Practice Area · Portfolio Risk Management

Overconcentration Attorney

Diversification is not just an investment principle. It is a professional obligation. When your broker built a portfolio with excessive concentration in a single stock, sector, or product without adequate disclosure and authorization, they may be liable for every dollar that concentration cost you.

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Why Concentration Is Dangerous

A Diversified Portfolio Weathers Events That Destroy a Concentrated One.

Diversification works by spreading risk across multiple investments so that no single event, company failure, or sector downturn can cause catastrophic loss to the overall portfolio. When a broker builds a portfolio with excessive concentration in a single security, sector, or product type, that protective mechanism is eliminated. A risk that would cause a modest loss in a diversified portfolio can cause total or near-total loss in a concentrated one.

Brokers who build overconcentrated portfolios often do so for straightforward reasons: they are promoting a particular stock, they earn higher commissions from a specific product category, or they have formed a relationship with the management of a company and have made a business judgment that the investor should be heavily exposed to that company's fortunes. None of these reasons justifies the risk imposed on the investor without disclosure and specific authorization.

The authorization question: Some investors knowingly choose to hold concentrated positions, particularly in employer stock or family company shares. A broker who builds concentration at the investor's specific, informed direction is in a different position than one who constructs it without discussion. The key question is whether you understood the concentration risk and specifically authorized it, or whether you were simply told the investment was good and trusted your broker to manage your portfolio appropriately.

Types of Overconcentration

The Most Common Forms of Overconcentration Claims

Single Stock Concentration

A significant portion of the portfolio placed in one company's stock, often employer stock or a stock the broker is promoting, creating exposure to company-specific events that diversification would eliminate or reduce substantially.

Sector Concentration

A portfolio heavily weighted toward a single industry such as technology, energy, real estate, or financial services, amplifying the impact of sector-specific downturns on the overall portfolio value.

Product Type Concentration

A portfolio filled with similar product structures such as non-traded REITs, variable annuities, or alternative investments that share common risks and illiquidity characteristics the investor may not fully understand.

Geographic Concentration

Excessive exposure to a single geographic market, as seen in the Puerto Rico bond crisis where investors held the majority of their savings in Puerto Rico government obligations that defaulted simultaneously.

Issuer Concentration

Multiple products from a single issuer, such as GWG L Bonds alongside GWG-affiliated investments, creating correlated risk across positions that the investor may believe are diversified but are actually exposed to the same underlying credit and business risk.

Employer Stock Concentration

Holding a high percentage of retirement savings in employer company stock, creating a situation where the same economic event that causes job loss also destroys retirement assets, compounding harm at precisely the worst moment.

The Regulatory Standard

What Brokers Were Required to Do Before Building a Concentrated Portfolio

  • FINRA Rule 2111 Suitability and Portfolio-Level Analysis: The suitability obligation encompasses the overall portfolio, not just individual recommendations. A broker who recommends a series of individually suitable investments that together create an unsuitable concentration has violated suitability standards at the portfolio level even if each individual recommendation passed muster in isolation.
  • Regulation Best Interest and Holistic Portfolio Analysis: Reg BI requires brokers to consider the impact of a new recommendation on the investor's overall investment portfolio, explicitly including concentration and diversification as relevant factors in the best interest analysis. A broker who recommends a position without evaluating its concentration impact on the whole portfolio has failed to comply with Reg BI.
  • Duty to Disclose Concentration Risk: Even where a concentrated position is suitable, the broker is required to disclose the specific risks of concentration, including the amplified impact of adverse events affecting the concentrated issuer, sector, or product type, before the investor commits funds.
  • Investment Adviser Duty to Diversify: Registered investment advisers managing discretionary portfolios have an affirmative duty to maintain appropriate diversification consistent with the client's investment policy statement unless the client has specifically authorized a concentrated strategy in writing.

Why Jorge Riera

Portfolio-Level Analysis Backed by CPA Credentials and SEC Enforcement Experience

Overconcentration cases require demonstrating both that the concentration was excessive relative to the investor's profile and that the losses caused by the concentration would not have occurred in a properly diversified portfolio. That analysis requires constructing an alternative portfolio model and calculating the performance differential. Jorge L. Riera's CPA credentials and SEC enforcement background make him uniquely equipped to drive that analysis effectively.

CPA Advantage in Portfolio Reconstruction

Proving concentration damages requires reconstructing what a properly diversified portfolio appropriate for the investor's profile would have produced over the same period, then comparing that result to the actual concentrated portfolio outcome. Jorge's CPA credentials enable faster case evaluation, better expert direction, and stronger cross-examination of the firm's portfolio expert at the arbitration hearing.

FINRA NAMC Institutional Knowledge

As one of only 7 Public Members of FINRA's National Arbitration and Mediation Committee, appointed by the FINRA Board of Governors, Jorge has direct knowledge of how FINRA arbitration panels evaluate portfolio-level suitability claims, including the standards panels apply when assessing whether concentration was excessive and whether the investor's authorization was adequately informed.

All overconcentration claims are handled on a contingency fee basis. No legal fee unless we recover.

Clients may be responsible for costs and expenses regardless of outcome.


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or call (305) 204-9779

Common Questions

Overconcentration: Frequently Asked Questions

Suitability is evaluated at the portfolio level, not just trade by trade. A broker who recommends a series of purchases that individually appear reasonable but cumulatively create an overconcentrated position has violated portfolio-level suitability standards even if the investor approved each individual transaction. The broker was required to evaluate and disclose the concentration effect of each recommendation on the overall portfolio, not simply present each trade in isolation.
Expressing interest in an investment is not the same as authorizing concentration in it. Your broker was required to explain the risk of holding a large percentage of your portfolio in a single stock, including the impact of a company-specific adverse event on your overall financial picture, before building a concentrated position. If you were not told that 40 percent of your portfolio was in one stock, or were not told what that meant for your risk exposure, you did not meaningfully authorize the concentration.
There is no bright-line percentage, but courts and FINRA panels have generally found that positions exceeding 10 to 20 percent of a portfolio in a single issuer warrant heightened scrutiny and specific disclosure, and positions exceeding 25 to 30 percent are presumptively concentrated for most retail investor profiles. The appropriate concentration level also depends on the nature of the investment: concentration in a single speculative stock is far more concerning than concentration in diversified index funds. The investor's specific financial situation, risk tolerance, and investment objectives are all relevant to determining whether the concentration was suitable.

No Fee Unless We Win

A Portfolio Built Around One Bet Is Not a Portfolio. It Is a Risk You May Not Have Agreed To.

If your losses were caused or amplified by concentration in a single stock, sector, or product that your broker built without adequate disclosure and authorization, contact the firm for a free, confidential evaluation of your claim.

Request a Free Case Evaluation

or call (305) 204-9779

Jorge L. Riera, Esq., CPA, CGMA, MAcc · Former SEC Senior Enforcement Counsel · FINRA NAMC Public Member & Expungement Subcommittee Chair · AV Preeminent (Martindale-Hubbell) · Avvo 10.0 · PLI Securities Arbitration Faculty 2026 · Contingency Fee Representation