CTRM vs SBLK: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
SBLK is the larger of the two ($3.21B market cap): the incumbent the market prices for continued execution (8.06x forward earnings, beta 0.74). CTRM is the smaller challenger ($18.84M): more room to run, but more to prove. The real question is which set of drivers you believe, and whether owning one (or both) leaves you over-concentrated.
CTRM vs SBLK: the tie-breaker metrics
Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | CTRM | SBLK | What it tells you |
|---|---|---|---|
| Market cap | $18.84M | $3.21B | Size. The larger name is the incumbent; the smaller has more room to grow and more to prove. |
| Trailing P/E | 0.58 | 23.00 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 1.19 | 0.74 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 29% of range | 95% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
| Price / book | 0.03 | 1.32 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Before you buy: how CTRM and SBLK affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. CTRM and SBLK share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined CTRM and SBLK exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does Castor Maritime (CTRM) do?
Castor Maritime Inc. is an international shipping company that owns and operates a small fleet of dry bulk carriers and containerships, chartering them out to move cargo worldwide. In Q1 2026 it operated an average of about 9 vessels, down from roughly 12 a year earlier after prior vessel sales, while its Daily Time Charter Equivalent rate rose to about $14,926 from $9,555. In December 2024 Castor acquired a roughly 74% stake in MPC Munchmeyer Petersen Capital AG, a Frankfurt-listed investment and asset manager focused on maritime and energy infrastructure with several billion euros in assets under management, adding an asset-management segment on top of the vessel-operating business. The company had earlier spun off its tanker fleet into a separate entity, Toro Corp, in 2023.
What does Star Bulk Carriers Corp (SBLK) do?
Star Bulk Carriers Corp is a Greece-based, Nasdaq-listed dry bulk shipping company that owns and operates a large, diversified fleet: as of the end of 2025 it owned about 136 vessels spanning Newcastlemax, Capesize, Post Panamax, Kamsarmax, Panamax, Ultramax, and Supramax classes, with carrying capacities from roughly 55,000 to over 209,000 deadweight tonnes. These ships haul dry commodities (iron ore, coal, grain, bauxite, and similar cargoes) on spot voyages and time charters, so Star Bulk is a price-taker: its revenue and cash flow are driven mainly by charter rates and the Baltic Dry Index rather than by any single customer or product. Its April 2024 all-stock merger with Eagle Bulk added 52 vessels and made it the largest US-listed dry bulk operator, giving it scale advantages in operating costs and chartering.
CTRM vs SBLK: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- CTRM drivers: Charter rates and the dry bulk cycle; Pivot toward asset management.
- SBLK drivers: Freight rates and the Baltic Dry Index; Scale after the Eagle Bulk merger.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The dominant risk is that Castor is a highly speculative micro-cap with a long history of reverse stock splits and dilution, which has repeatedly eroded per-share value. For SBLK, the dominant risk is freight-rate cyclicality: dry bulk rates and the Baltic Dry Index are volatile and tied to global commodity demand, especially Chinese iron ore, coal, and steel activity, so a slowdown can compress cash flow and the variable dividend quickly.
CTRM or SBLK: which should you pick?
Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick CTRM if you believe its drivers more; SBLK if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the CTRM and SBLK guides.
CTRM vs SBLK: the full fundamentals
CTRM. Figures are approximate, tied to the asOf date, and should be verified against the latest filings before acting. Standard valuation multiples are difficult to apply here because a large share of reported net income came from non-operating investment gains that may not repeat, so headline earnings can overstate the durable, cash-generating part of the business. The very small market capitalization, thin liquidity, and history of dilution mean the shares can be highly volatile and are best treated as speculative.
SBLK. Figures are approximate, drawn from public reporting around the asOf date, and can change fast; verify live numbers before acting. Star Bulk is a highly cyclical shipper, so headline yield and earnings can be misleading: a large trailing dividend reflects a strong freight market that may not repeat, and the variable, formula-driven payout can fall sharply if charter rates weaken. What matters most is where dry bulk freight rates and the Baltic Dry Index sit in the cycle, not any single quarter's dividend or profit figure.
Headline figures (approximate, Jul 2026): CTRM shows revenue (q1 2026) ~$21.3 million (vessel ~$11.9M plus service ~$9.3M); figures approximate, verify live, net income (q1 2026) ~$69.2 million, but mostly from a ~$46.5M gain on equity-method investments plus ~$18.5M other income, not core shipping, market cap ~$20 million (stock around $2 per share, roughly 9.7 million shares outstanding), fleet ~9 vessels operated on average in Q1 2026, dry bulk plus containership, down from ~12 a year earlier; SBLK shows fleet ~136 owned dry bulk vessels at end of 2025, from Supramax to Newcastlemax (approximate), revenue ~US$1.04 billion for full-year 2025; Q1 2026 revenue ~US$281 million (approximate), net income / eps ~US$84 million for full-year 2025; Q1 2026 ~US$58.5 million, or ~US$0.56 per share (approximate), dividend policy Distributes ~100% of post-debt-service cash flow (after allowances); management pointed to >US$3 per share targeted for 2026 under the then-current FFA curve (variable, not guaranteed).
The bottom line: CTRM vs SBLK
CTRM and SBLK are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined CTRM and SBLK exposure against your real portfolio. It is not an investment adviser.
Wondering how CTRM or SBLK fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Castor Maritime with AI
Connect the broker you already use and ask Walnut's AI how CTRM fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between CTRM and SBLK?
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Castor Maritime Inc. Star Bulk Carriers Corp is a Greece-based, Nasdaq-listed dry bulk shipping company that owns and operates a large, diversified fleet: as of the end of 2025 it owned about 136 vessels spanning Newcastlemax, Capesize, Post Panamax, Kamsarmax, Panamax, Ultramax, and Supramax classes, with carrying capacities from roughly 55,000 to over 209,000 deadweight tonnes. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is CTRM or SBLK the better stock?
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Neither is universally better. SBLK is the larger incumbent; CTRM is the smaller challenger. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, CTRM or SBLK?
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A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both CTRM and SBLK?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of CTRM vs SBLK?
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CTRM: The dominant risk is that Castor is a highly speculative micro-cap with a long history of reverse stock splits and dilution, which has repeatedly eroded per-share value. Its recent reported profits leaned heavily on investment and foreign-exchange gains rather than shipping operations, so headline net income may not recur and can reverse if markets move. Shipping itself is deeply cyclical, and a small fleet leaves Castor sub-scale versus far larger dry bulk operators. The related-party structure, with key financing provided by Toro Corp (an entity controlled by the chairman and CEO), creates potential conflicts of interest and governance concerns. Nasdaq minimum-bid-price compliance and possible future dilution or splits remain live risks. Low market capitalization and thin liquidity can also make the shares volatile and hard to exit at a stable price. SBLK: The dominant risk is freight-rate cyclicality: dry bulk rates and the Baltic Dry Index are volatile and tied to global commodity demand, especially Chinese iron ore, coal, and steel activity, so a slowdown can compress cash flow and the variable dividend quickly. Because the dividend is formula-driven off cash flow, income from the stock is inherently unpredictable and can be cut sharply in a weak market. Newbuilding order books and fleet supply growth across the industry can depress rates even when demand holds. Fuel costs, environmental and emissions regulations, and canal or chokepoint disruptions add operating and routing risk. As a Greece-based, foreign-incorporated company, it also carries currency, tax-structure, and governance considerations that differ from a typical US operating company. Vessel values themselves are cyclical, so asset write-downs are possible in downturns.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell CTRM or SBLK; figures are approximate and dated (as of August 2026). Verify current data before investing.