BlackRock runs two nearly identical tech funds side by side, but one quietly hands income investors a structural advantage the other can never offer, and most BST holders have no idea it exists.
If you own the BlackRock Science and Technology Trust (NYSE:BST) for the monthly income and mega-cap AI exposure, you already know why the fund has a following: a steady $0.25 monthly distribution, a portfolio anchored by NVIDIA, Broadcom, and Apple, and a 31.28% total return year-to-date. Simply put, BST is doing its job. It also has a sibling in the BlackRock closed-end lineup that pays a higher yield, has climbed further in 2026, and trades meaningfully below the value of its underlying assets. For an income investor who bought BST for the payout, that gap is worth a closer look.
That sibling is the BlackRock Science and Technology Term Trust (NYSE:BSTZ), a fund with a fixed end date built into its charter. That single structural feature changes the math for anyone weighing the two.
Why BST Attracts Income Buyers
BST is a perpetual closed-end fund with an expense ratio of 1.11% and a managed monthly distribution (if you like the idea of a check every 30 days, we rounded up seven other monthly payers in a free report here). At a recent price of $50.83, the $3.00 annualized payout works out to a forward yield of roughly 5.9%. The portfolio leans toward the largest AI-adjacent public companies, with SK Hynix at 5.16%, Lam Research at 5.03%, Taiwan Semiconductor at 3.41%, and Alphabet at 3.19% rounding out the top holdings. Private positions such as Anthropic at 5.14% and Databricks at 4.54% add some venture flavor, but the fund is fundamentally a public tech vehicle.
Per BlackRock’s own page, BST’s NAV was $52.89 on September 8, 2026, and the market price sat at a -3.93% discount. That is close to fair value, which is the number that quietly undercuts the income story.
Where BST Leaves Money on the Table
A perpetual CEF trading near NAV has no built-in mechanism to close the discount. Holders collect the distribution and ride the market price. That is fine when the fund is priced sensibly, but it is exactly why BSTZ deserves consideration: the term trust has both a wider discount and a hard date on which that discount is designed to disappear.
BSTZ: Wider Discount, Higher Yield, Deadline Attached
BSTZ trades at $31.52 against a NAV of $33.24 as of September 4, 2026, a discount of roughly 6.2%. Its $0.1625 monthly distribution annualizes to $1.95, or about 6.2% at the current price. Year-to-date, the market price has advanced 46.59%, compared with 31.28% for BST. Over the past year, the gap is similar: 56.84% versus 41.02%.
The key fact is the term structure. Per BlackRock’s prospectus, BSTZ intends to dissolve on or about June 26, 2031. Barring an extension approved by the board, shareholders receive net assets at that date. Buying at a 6.2% discount today locks in an implicit tailwind if the fund liquidates at or near NAV, on top of whatever the underlying portfolio does over the next roughly five years. BST holders get no such structural nudge.
Different Portfolio, Different Bet
BSTZ offers a meaningfully different portfolio from BST. Its top position is Databricks at 13.51%, followed by PSIQuantum at 5.28%, Micron at 4.52%, Anthropic at 4.08%, Lumentum at 3.98%, NVIDIA at 3.73%, SambaNova at 3.7%, and SpaceX at 3.1%. That is a heavier tilt toward pre-IPO companies, quantum computing, optical components, and space technology than BST offers. It is also why the fund carries a higher expense ratio of 1.35%: private positions are more expensive to source and value.
Tradeoffs to Weigh
Three points a BST holder should sit with before rotating. First, the fee gap is real: 1.35% versus 1.11% is 24 basis points of annual drag on BSTZ. Second, the private book cuts both ways. If Databricks or Anthropic gets marked down, BSTZ’s NAV moves more than BST’s does. Third, the December 2025 special distribution of $0.517116 on BSTZ and $1.451471 on BST were year-end true-ups, not repeatable base yield.
How to Think About a Swap
In a taxable account, selling BST after a 31% year would likely realize a meaningful gain, so run the tax number before touching the position. Inside an IRA or 401(k), the friction disappears and the rotation is merely a paperwork exercise. A partial swap, moving, say, a quarter of a BST position into BSTZ, captures the discount and yield edge without concentrating the entire allocation in a fund whose largest holding is a single private company at 13.51%. Setting distributions to reinvest at the discount amplifies the term-trust benefit if BSTZ continues to trade below NAV between now and 2031.
What This Means for Your Position
BST remains a fair-value, perpetual, mega-cap tech CEF that pays 5.9%. BSTZ offers a higher current yield, a wider discount that has a scheduled expiration, and a portfolio tilted toward private AI, quantum, and space names that BST touches only lightly. If you want the classic BlackRock managed monthly payout with liquid mega-cap exposure, BST remains reasonable. If you want the same manager, a higher payout, and a structural catalyst pointing to 2031, BSTZ is the version worth owning.
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