Data Integrity · Market History
Suzlon Ltd's All-Time High Isn't ₹460.
Here's What Five AI Tools Got Wrong.
Ask five different AI chatbots the same simple question — what was Suzlon's all-time high? — and you'll get five different answers, ranging from ₹422 to ₹460. SEPC Ltd has the same problem, quietly buried since 2008. Here's the real data, and why the confusion matters more than it looks.
It started as a simple fact-check. A reader asked for
Suzlon Energy Ltd's (₹46.86) all-time high price. Nothing dramatic — the kind of question you'd expect a one-line answer to.
Instead, five AI models — ChatGPT, Grok, Gemini, DeepSeek, and Perplexity — each returned a different number. ₹422. ₹430.90. ₹422.08. ₹459.79. One even built an elaborate theory involving stock-split adjustments and annual report footnotes to justify ₹460. It sounded authoritative. It was wrong.
Suzlon Energy's genuine all-time high was approximately ₹420–422, reached intraday on 9 January 2008. NSE-tracked historical data puts the exact figure at ₹422.08. A separate long-term archive puts the peak marginally lower, at ₹419.96, in the same month.
This was the top of the 2007-08 bull run — weeks before Suzlon executed a 5:1 stock split (face value ₹10 → ₹2), which became effective on 21 January 2008. The split explains why some data feeds show oddly different numbers after that date. It does not explain the ₹460 figure, because that number claims to describe the pre-split price itself — the one part of this story that never needed adjusting.
A pre-split price does not need "adjusting" to be compared with itself. It already is the real, raw, traded number.
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Where ₹460 Actually Came From
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Somewhere along the way, a well-meaning but flawed logic took hold: since Suzlon later split 5:1, shouldn't the pre-split high be "adjusted" for comparison purposes, the way we adjust historical prices across a split to build a continuous chart?
The answer is no — not for the pre-split price itself. Split-adjustment exists to make prices before and after a split comparable on the same chart. But the pre-split high was already a real, traded, unadjusted number. There is no genuine ₹460 print on any exchange for Suzlon, in January 2008 or any other month.
Once one source published this reasoning, it appears to have been picked up, restated, and reinforced across AI models and data aggregators — a small case study in how confidently-worded misinformation compounds when nobody checks the primary exchange data.
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Not Just Suzlon: SEPC Ltd's Forgotten ₹335.79 Peak
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Suzlon is not alone in carrying an all-time high that today's investors have simply forgotten about. SEPC Ltd (then Shriram EPC Ltd, CMP: ₹5.43) listed on the exchanges via an IPO priced at ₹300 per share in February 2008 — almost the exact same window as Suzlon's own peak, just weeks apart, riding the same pre-crisis euphoria.
SEPC's all-time high stands at ₹335.79, reached on 20 February 2008 — its listing month. The stock has never come close to that level since. At today's price of around ₹5.43, SEPC trades roughly 98% below its 2008 peak, an even steeper distance than Suzlon's own fall from ₹422.
Unlike Suzlon, SEPC's number carries no stock-split confusion at all — it has never split its shares. Which makes it a cleaner, quieter example of the same broader truth: several of India's well-known 2008-vintage names are still trading at a small fraction of where they once stood, regardless of how strong their present-day turnaround stories are.
Two 2008-Vintage Peaks, Side by Side
| Company |
All-Time High |
Date |
CMP (Approx.) |
| Suzlon Energy |
₹422.08 |
9 Jan 2008 |
~₹45-50 |
| SEPC Ltd |
₹335.79 |
20 Feb 2008 |
~₹5.43 |
Neither Suzlon nor SEPC is a special case. Data vendors routinely mix BSE and NSE feeds, intraday highs and closing highs, and split-adjusted versus raw prices — and each combination quietly produces a slightly different "all-time high" that sounds equally authoritative.
For most stocks, these differences are trivial. But for retail investors building an investment thesis, or simply trying to understand how far a stock has fallen from its glory days, the gap between ₹422 and ₹460, or between a real number and an invented one, is the difference between analysis and folklore.
What the exact number obscures is the real story underneath it. Suzlon fell from ₹422 all the way to ₹1.56 in March 2020, before staging a genuine turnaround built on debt reduction and order-book strength, recovering to a 52-week high near ₹86 by September 2024.
SEPC's arc has been slower and less complete — from ₹335.79 in 2008, through its own near-death low of ₹1.76 in March 2020, to a present-day price still hovering in the single digits, even as a new promoter group and a stronger order book attempt to rebuild the story from scratch.
The SumanSpeaks Verdict
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What This Means
Always verify historical price data against exchange - sourced records before building a thesis or a headline on it. Confident - sounding AI answers are not a substitute for primary data.
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What Stays Constant
Both Suzlon and SEPC remain a fraction of their 2008 peaks. Whatever the exact number, the distance travelled — down and now partly back up — is the real investment story.
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This article is published by SumanSpeaks (sumanspeaks.blogspot.com) for general informational and educational purposes only. The author has over 25 years of capital markets experience. This is not a recommendation to buy, sell, or hold any security. Historical price figures cited here may vary marginally across data vendors depending on exchange, intraday-vs-closing basis, and split-adjustment methodology; readers are encouraged to verify against exchange records for precision. All data is sourced from public exchange filings, regulatory orders, and credible financial media. Readers must conduct independent due diligence before making any investment decision.
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