BlackRock Science & Technology Term Trust (BSTZ)

BlackRock Science & Technology Term Trust is a closed-end investment fund that concentrates its portfolio in science and technology equities—both public companies and, increasingly, private ones—with a mandate to deliver capital appreciation and income over a defined term. Unlike an open-ended mutual fund, which can grow or shrink with investor inflows and outflows, a closed-end fund has a fixed capital base set at launch and trades like a stock on an exchange. BSTZ’s fixed term was originally set at twelve years, subject to extension, with a contingent conversion feature to perpetual structure if shareholders approve.

How a closed-end term trust differs from a mutual fund

The mechanics of a closed-end fund create a fundamentally different animal from a traditional open-ended mutual fund. When you invest in a Vanguard or Fidelity mutual fund, your purchase creates new shares the fund must hold your cash for, and when you sell, the fund redeems your shares for cash. The fund’s size fluctuates constantly.

A closed-end fund works differently. It raises capital at launch, closes the offering, and that capital base stays fixed. Shares trade on an exchange like any stock, meaning their price is set by supply and demand rather than calculated daily as a percentage of the fund’s assets. This creates the possibility of trading at a discount to net asset value—the underlying value of the holdings per share—if more investors are selling than buying, or at a premium if demand exceeds supply.

A term trust adds another layer: it is a closed-end fund with a stated endpoint. BSTZ was issued with a twelve-year life, meaning the fund was originally scheduled to liquidate its portfolio and return capital to shareholders at the end of that period. Term structures are less common than perpetual closed-end funds but appeal to investors who want an explicit endgame and managers who can build a portfolio with a clear investment horizon.

The portfolio: public tech equities plus a private-investment layer

At its core, BSTZ invests in public equities: technology companies with market capitalisation across the spectrum, from large-cap incumbents to smaller, faster-growing firms. The fund’s mandate requires at least eighty percent of assets in science and technology equities, leaving room for cash and other holdings.

What distinguishes BSTZ within the closed-end fund universe is its allocation to private companies. As of late 2025, the fund held approximately twenty private investments representing roughly thirty-eight percent of the fund’s net asset value. This tilt toward private equity sets BSTZ apart from most exchange-traded technology funds, which are limited to publicly listed securities.

The private component reflects BlackRock’s scale and infrastructure: the firm manages private-equity portfolios globally and can deploy capital into emerging technology companies before they are public. For BSTZ, this means the portfolio can include Series B and Series C venture rounds, majority stakes in companies that are pre-IPO, and stakes in privately held infrastructure companies supporting the broader technology ecosystem.

Strategic orientation: digital infrastructure and enabling technologies

The fund’s recent positioning suggests a deliberate shift toward what BlackRock calls digital infrastructure enablers and advanced computing. This is not a concentrated bet on one sector but a broad exposure to companies supplying the foundational technology layers that support cloud computing, artificial intelligence, and data-center operations.

Examples include semiconductor memory manufacturers, data-centre infrastructure operators, advanced packaging suppliers for chips, and software that manages critical IT infrastructure. The logic is that regardless of which application—AI, e-commerce, defence, or enterprise software—wins in the next decade, many will depend on these foundational layers.

This differs from a pure growth-at-any-price technology fund. BSTZ is not simply chasing the hottest startup or the stock with the highest revenue growth. Instead, it is positioning for what BlackRock’s managers judge to be structural, long-term demand drivers: the need for processing power, storage, and the infrastructure to move data at scale.

Income and yield mechanics

Like most closed-end funds, BSTZ markets itself on the basis of a high distribution yield—the annual payout to shareholders as a percentage of the fund’s trading price. As recently as 2025, the fund was advertising a yield of approximately eleven percent, well above the yield on either the NASDAQ or large-cap technology stocks.

This high yield is possible because closed-end funds are permitted to make distributions from sources other than current income. If the underlying portfolio appreciates, the fund can use a portion of that gain to fund distributions without cutting into capital. This is sometimes called “return of capital” or “distribution from appreciation,” and it is perfectly legal and standard for closed-end funds. The trade-off: if the portfolio does not appreciate enough to fund those distributions, the fund’s net asset value per share will decline over time.

The options-strategy discontinuation

Until November 2025, BSTZ deployed a written covered call options strategy as part of its return profile. In simple terms, this meant selling call options against the equity holdings—betting that the stocks would not rise sharply and pocketing the premium from those short calls as additional return to shareholders. When the underlying stocks did rise, the fund would have shares called away at the strike price, capping the upside.

This strategy was effective during periods of muted volatility and moderate valuations, when both the call premiums were attractive and the risk of being called away was low. As volatility and valuations shifted in 2024 and 2025, BlackRock discontinued the strategy, opting instead for a purely long equity-plus-private portfolio without short options positions.

The liquidity and valuation challenge

As a closed-end fund trading on an exchange, BSTZ’s stock price can drift from the underlying net asset value, sometimes by a wide margin. If the fund falls out of favour with investors, the discount can be deep—meaning you could buy BSTZ shares at a price well below the fund’s per-share holding value. Conversely, if the fund is in favour, the shares can trade at a premium.

This is not necessarily a problem; a large discount can actually present an opportunity for a patient investor. But it does mean BSTZ is not directly equivalent to owning the underlying portfolio. The market’s appetite for closed-end funds and technology exposure on any given day will influence the price independently of the holdings.

The private-investment portion adds another wrinkle: private companies are not marked to market daily, so their valuation in the fund’s net asset value reflects BlackRock’s internal estimates. These estimates may lag or lead the true market value, which can only be known when the company is sold, liquidates, or goes public.

How to research BSTZ as an investment

Start with BlackRock’s quarterly fact sheet and commentary, available on the fund’s product page, which details portfolio composition, the allocation to private investments, and management’s views on the near-term outlook. Check the fund’s discount or premium to net asset value—a significant discount might offer value, or it might signal investor scepticism worth heeding.

Look at the monthly distribution history to understand what proportion of the fund’s payout is coming from investment income versus return of capital; a fund returning much more capital than it is earning in dividends will eventually draw down its net asset value. Monitor the liquidity of the fund’s trading—that is, the bid-ask spread on the stock—because a wide spread means you will pay a larger cost to buy or sell.

Finally, remember that BSTZ is a leveraged bet on science and technology appreciation. If you believe in the long-term growth of those sectors, and you have the patience to hold through volatility, the fund offers a concentrated exposure with professional management and access to private companies that a typical retail investor could not purchase alone. If you do not believe in that thesis, no yield will compensate for holding a concentrated position in a sector you distrust. As with any single security, BSTZ trades at prices set by the market; this is a description of how the fund works, not an investment recommendation.