I track insider transactions regularly looking for interesting ideas.
In many transactions, the exercise yields very little. A director buying a few shares after a sharp fall in the stock price is not unusual. Neither is the occasional promoter purchase.
What catches my attention is a pattern.
The buying wasn't a one-off transaction. The open market purchases have been recurring - since December 2025 and have continued through May 2026. What made it particularly interesting was that the insider buying continued even as the stock price moved higher.
Usually, when a stock rallies, insider buying tends to slow down. This has not been the case for CFF.
Initially, I did not spend much time on the company.
The reason was simple. CFF Fluid Control is an SME stock, and I generally approach the segment with caution.
SME investing comes with a unique set of challenges - limited disclosures, lower liquidity, larger trading lots, and the possibility that exiting a position during difficult periods may not be easy. While the segment has produced some exceptional wealth creators, it has also produced many companies that never quite lived up to expectations.
But the insider buying kept showing up. Finally, curiosity got the better of me.
Digging into the Business
The first thing I wanted was understanding CFF's business.
The name does not reveal much. It sounds like an industrial engineering business. Dig deeper, however, and a much more interesting picture emerges.
Founded in 2012, CFF Fluid Control has evolved from a manufacturer of specialised components into a supplier of advanced systems for naval ships and submarine platforms.
Today, the company serves the lifecycle requirements of Indian Navy vessels and submarines. Its product portfolio includes sonar systems, stealth systems, integrated platform management systems, and weapon-related systems.
These are not commoditised products. They are mission-critical systems where engineering capability, reliability, and years of qualification matter.
Over the years, the company has invested in technology development and engineering capabilities, while also collaborating with global defence players. These partnerships have helped it move up the value chain and develop products tailored to the evolving requirements of naval customers.
Its client list includes major domestic shipyards as well as international defence OEMs.
Beyond defence, the company also manufactures critical equipment and systems for sectors such as nuclear and clean energy.
The Detail That Stood Out
As I dug deeper, one detail stood out.
According to CRISIL, CFF is recognised by the Indian Navy as the authorised equipment manufacturer for several of the products it manufactures and services. In the defence industry it can be a significant advantage.
It offers CFF recurring business opportunities through spare parts, repairs, maintenance, and upgrades. For certain products, it positions CFF as a single-source vendor.
The company also holds the required certifications and registrations with defence public-sector shipyards and other relevant agencies, creating barriers that are difficult for new entrants to replicate quickly.
This is perhaps one of the less appreciated aspects of defence manufacturing. Winning the first order is important, but once a supplier becomes embedded in a defence ecosystem, the relationship can continue for years.
The Numbers Support the Story
Of course, a good story alone is never enough. The numbers must support it.
So far, they do.
According to CRISIL, the company's revenue has grown at a three-year CAGR of around 46% through FY25.
The momentum appears to have continued into FY26.
Revenue for FY26 stood at over Rs 2 billion, up 43.4% YoY (year-on-year). Operating profit grew by 45.1%, while operating margins remained healthy at around 28.3%.
The bottom line was even more impressive. Net profit increased by more than 64% YoY, with net margins of roughly 18.8%.
Equally important, growth appears to be backed by a healthy pipeline of orders. As of July 2025, the company reported an order book of approximately Rs 5.4 bn, which is well above two times FY26 revenue. That provides a reasonable visibility for growth.
For an SME-listed company, CFF is no longer particularly small. It currently commands a market capitalisation of around Rs 15 bn.
Promoters continue to hold over 68% of the company (decent skin in the game), despite some dilution following the follow-on public offer in July 2025. Prior to the issue, promoter ownership was above 73%.
The promoter group also brings more than three decades of experience in the defence industry - a factor that should not be overlooked in a business where relationships, qualifications, and execution capabilities matter.
The balance sheet is another positive.
Return on Capital Employed (RoCE) stands at around 20%, while Return on Equity (RoE) is approximately 15%. Debt levels remain negligible, reducing financial risk. The company also pays a dividend.
What Could Go Wrong?
No investment story is complete without understanding the risks.
The first concern is working capital.
Defence and naval projects are characterised by long execution cycles and milestone-based payments. As a result, receivables and inventory levels tend to be elevated.
CFF is no exception. Despite strong accounting profits, the company has reported weak operating cash flows, largely due to working capital requirements. This aspect needs close monitoring.
The second risk is the nature of the industry itself.
While India's defence indigenisation push and naval modernisation programmes provide a favourable backdrop, order inflows remain largely dependent on tenders and project awards. There can be fluctuations in revenue and profitability and vulnerability to defense and shipbuilding capex cycle.
And then there is the SME factor.
Liquidity can dry up quickly during certain market phases or company specific stress, making entry and exit difficult. Investors considering the stock must be comfortable with this reality.
Coming Back to the Insider Buying
After spending some time on the business, the competitive positioning, and the financial performance, the insider purchases began to make more sense.
Senior management personnel has been buying shares consistently since December 2025 and continued doing so through May 2026. More importantly, the purchases continued even as the stock appreciated. The latest buying reportedly took place at prices above Rs 700 per share.
Insider buying should never be treated as an investment thesis by itself. Insiders can be wrong, and circumstances can change.
However, when insider purchases come along with strong growth, a sizeable order book, a strong balance sheet, and favourable industry tailwinds, they are worth paying attention to.
At the time of writing, the stock trades at roughly 38 times earnings. While that may not appear cheap on an absolute basis, the PEG ratio of around 0.6 suggests that earnings growth has so far been running ahead of the valuation multiple.
Final Thoughts
Let me be clear: This is not an investment recommendation.
SME stocks carry risks that many investors underestimate. Apart from business risks, low liquidity, potential corporate governance risks, and lack of enough and regular information are inherent issues in this space.
That said, among the SME companies, CFF Fluid Control stands out as an interesting business operating in a defence ecosystem that has tailwinds.
The company appears to have carved out a specialised position within naval and submarine systems, enjoys meaningful entry barriers, has demonstrated strong growth, and continues to attract insider buying even after a significant rise in the stock price.
Whether that translates into attractive shareholder returns from here remains to be seen.
If you are willing to venture into the SME universe and understand the risks involved, this is a stock that deserves a place on your watchlist.
Warm regards,

Richa Agarwal
Editor and Research Analyst, Hidden Treasure
Quantum Information Services Private Limited (Research Analyst)
Pankaj Goyal
Jun 24, 2026I am also thinking the same. If promoter holdings are decreasing, who is buying inside?