INSW vs TNK: Which Is the Better Buy in 2026?
Last updated September 2026
Short answer
INSW is the larger of the two ($4.94B market cap): the incumbent the market prices for continued execution (15.84x forward earnings, beta -0.10). TNK is the smaller challenger ($3.06B), cheaper on forward earnings (8.10x): 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.
INSW vs TNK: the tie-breaker metrics
Same yardstick, side by side (as of September 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 | INSW | TNK | What it tells you |
|---|---|---|---|
| Market cap | $4.94B | $3.06B | Size. The larger name is the incumbent; the smaller has more room to grow and more to prove. |
| Forward P/E | 15.84 | 8.10 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 6.38 | 5.20 | 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 | -0.10 | -0.23 | 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 | 96% of range | 87% 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 | 2.25 | 1.40 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Reading it: TNK is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.
Before you buy: how INSW and TNK 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. INSW and TNK 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 INSW and TNK 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 International Seaways (INSW) do?
International Seaways owns and operates a fleet of roughly 70 oceangoing vessels that transport crude oil and refined petroleum products in international trade. The business runs across two segments, Crude Tankers (VLCCs, Suezmaxes, and Aframaxes) and Product Carriers (MRs, LR1s, and LR2s), and also provides ship-to-ship lightering support services. Revenue is driven almost entirely by daily spot charter rates, which swing sharply with global oil demand, ton-mile trade patterns, and geopolitical disruption.
What does Teekay Tankers (TNK) do?
Teekay Tankers is one of the world's larger owners and operators of mid-size crude oil tankers, running a fleet of Suezmax, Aframax and LR2, and VLCC vessels that carry crude and refined products around the world. The company earns most of its money on the spot market, chartering ships voyage by voyage at rates that rise and fall with tanker supply and demand, and supplements that with some fixed-rate time charters and a ship-to-ship transfer and management business. Because it is spot-heavy, revenue and profit are tightly linked to daily charter rates, which can multiply or collapse over a single year.
INSW vs TNK: 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.
- INSW drivers: Strong tanker spot rates; Diversified fleet mix.
- TNK drivers: Strong tanker rate cycle; Net-cash balance sheet and capital returns.
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: INSW's earnings are highly cyclical and depend on spot charter rates that can fall sharply and unpredictably. For TNK, teekay Tankers is deeply cyclical, and its spot exposure means earnings can fall as fast as they rose if charter rates normalize or decline.
INSW or TNK: 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 INSW if you believe its drivers more; TNK 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 INSW and TNK guides.
INSW vs TNK: the full fundamentals
INSW. INSW posted record Q1 2026 results, with revenue up roughly 78% year over year and adjusted EPS of about $3.90 beating consensus. Tanker operators typically trade at low single-digit to high single-digit forward earnings multiples to reflect the cyclicality of spot rates. Reported earnings can swing widely quarter to quarter with the rate environment.
TNK. TNK trades at a low single-digit to high-single-digit earnings multiple and a deeply discounted EV/EBITDA, typical of tanker stocks that the market prices for a coming rate downturn. Reported profits reflect near-peak charter rates, so trailing valuation multiples can look cheap precisely because investors doubt earnings are sustainable. The net-cash balance sheet and record profitability drove the stock up sharply over the past year.
Headline figures (approximate, Q1 2026): INSW shows revenue (q1 2026) ~$325M, revenue (fy2025) ~$1.0B, net income (q1 2026) ~$286M, diluted eps (fy2025) ~$6.23; TNK shows revenue (fy2025) ~$952 million, gaap net income (fy2025) ~$351 million (~$10.15/share), adjusted net income (fy2025) ~$241 million, revenue (q1 2026) ~$286 million.
The bottom line: INSW vs TNK
INSW and TNK 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 INSW and TNK exposure against your real portfolio. It is not an investment adviser.
Wondering how INSW or TNK 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 International Seaways with AI
Connect the broker you already use and ask Walnut's AI how INSW 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 INSW and TNK?
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International Seaways owns and operates a fleet of roughly 70 oceangoing vessels that transport crude oil and refined petroleum products in international trade. Teekay Tankers is one of the world's larger owners and operators of mid-size crude oil tankers, running a fleet of Suezmax, Aframax and LR2, and VLCC vessels that carry crude and refined products around the world. 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 INSW or TNK the better stock?
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Neither is universally better. INSW is the larger incumbent; TNK is the smaller challenger and looks cheaper on forward earnings. 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, INSW or TNK?
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On forward P/E (as of September 2026), INSW trades at 15.84x and TNK at 8.10x, so TNK is the cheaper of the two on next year's expected earnings. 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 INSW and TNK?
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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 INSW vs TNK?
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INSW: INSW's earnings are highly cyclical and depend on spot charter rates that can fall sharply and unpredictably. A downturn in oil demand, a wave of newbuild vessel deliveries, or a normalization of trade routes could compress rates and cut cash flow quickly. The variable dividend can shrink dramatically in weak quarters because most of the payout is supplemental rather than base. Geopolitical shocks cut both ways, boosting rates in some scenarios and disrupting operations in others. Long-term demand for seaborne oil transport also faces uncertainty from the energy transition. TNK: Teekay Tankers is deeply cyclical, and its spot exposure means earnings can fall as fast as they rose if charter rates normalize or decline. Tanker rates are driven by factors largely outside the company's control, including global oil demand, OPEC production decisions, refinery patterns, and geopolitical events that reroute cargoes. A wave of newbuilding deliveries, weaker oil demand, or an easing of trade dislocations could compress rates and profits sharply. The stock is also controlled by the broader Teekay group, which limits minority shareholder influence, and the variable dividend means income is not dependable across the cycle.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell INSW or TNK; figures are approximate and dated (as of September 2026). Verify current data before investing.