İş Yatırım's Warrant Disclosures Reveal What Most Investors Miss About Turkey's Market Mechanics

Most people see the headline and think it's a compliance footnote. İş Yatırım Menkul Değerler A.Ş. (İş Yatırım) filed its routine daily trading disclosures for warrants and certificates it has issued, covering August 3 and 4. The announcement went through Turkey's Public Disclosure Platform, as required under Communiqué VII-128.3, the regulatory framework governing covered warrants on Borsa Istanbul. It's the kind of filing that gets recycled through wire services and filed away.

But if you think about what warrants actually do to the plumbing of a market, the daily volumes tell you something most commentary doesn't even ask about: who's sitting on the wrong side of gamma, and how much hedging pressure is lurking underneath the BIST 100.

Here's the mechanism. When İş Yatırım issues a covered warrant — a structured product that gives buyers leveraged exposure to an underlying stock or index without owning it — the issuer sits on the other side of the trade. They're short the warrant. And anyone who's short an option-like instrument is, by definition, short gamma. Gamma measures how fast the delta (the hedge ratio) of a position changes as the underlying price moves. If you're short gamma, you have to buy the underlying when it falls and sell it when it rises. You're amplifying the move, not dampening it.

In most equity markets, dealer gamma absorbs short-term shocks. When dealers are net long gamma — which happens when lots of retail investors buy calls and puts and dealers end up hedging the other side — price moves get mean-reverted. The dealer sells into strength, buys into weakness. That's the suppressed-volatility regime everyone notices during calm periods but rarely understands until it's gone.

But a warrant issuer is structurally the opposite. They sold the gamma. So when the BIST 100 takes a sharp move, İş Yatırım — and other warrant market makers on Borsa Istanbul — have to hedge in the direction of the move, not against it. Negative gamma. Momentum regime. The same mechanism that turns a 2% move into a 4% move in US equities during negative-gamma weeks.

Now, most people don't think about gamma in an emerging market context. They're looking at the BIST 100 and filing it under "recovery trade." The mainstream narrative is that Turkey's inflation-fighting monetary pivot — the central bank's return to orthodox tightening under Governor Fatih Karahan — is working, foreign capital is rotating back, and the structural story has turned.

Yes, there's a basis for that. The central bank hiked its key rate to 37% and has held it there for three consecutive meetings.

That's where the warrant disclosures matter. When İş Yatırım publishes daily buy and sell volumes for its own warrants, it's not just showing that it's fulfilling its market-making obligation — providing continuous bid and offer quotes, as the regulation requires. It's telling you how much leveraged exposure has been created, and therefore how much gamma the issuer is carrying. Higher warrant volumes mean more outstanding positions mean more forced hedging when the underlying moves.

I don't have the aggregate warrant volume across all Turkish market makers — the disclosures are issuer-by-issuer, and I haven't seen a consolidated read. The warrant business is part of a structured products franchise that's grown alongside Borsa Istanbul's broader derivatives push — VIOP, the exchange's futures and options platform, has expanded its market-making program over the years to cover single-stock futures and index options.

The data gap on aggregate dealer gamma in the Turkish warrant market is real. I can't tell you whether net gamma across all issuers is deeply negative or whether offsetting positions keep it manageable.

Think of it this way. The forecast is more optimistic than the market believes. And the dominant risks — the central bank's own words — are all on the upside: prolonged high energy prices, further food inflation, stronger persistence, supply chain disruption. All of it tied back to the conflict.

If the underlying asset base under these warrants drops sharply — oil spikes, the lira weakens, foreign money rotates out on geopolitical escalation — the warrant issuers have to buy into the decline. Not because they want to. Because gamma forces them to. And in an emerging market with tighter funding and less depth in hedging instruments than a developed market, that buying pressure is a secondary amplifier that most foreign investors aren't modeling.

Turkey's easing cycle stopped. The warrant book that worked fine when funding was cheaper now sits in a regime where hedging costs matter more. Understanding what I understand about spreads and economics would tell me that the structural risk isn't in the headline inflation number — it's in the position that gets forced when the number misses to the upside.

What to watch: the daily warrant disclosures from İş Yatırım and other Turkish market makers, not as compliance trivia but as a proxy for gamma exposure. Rising buy volumes relative to sell volumes in underlying-hedging activity would suggest the dealers are hedging into weakness — confirming negative-gamma mechanics in action. Rising overall warrant issuance without a corresponding rise in hedging volumes would mean the exposure is building quietly.

This is driven by mechanics, not by the narrative about Turkey's economic recovery. The narrative is important. But the narrative doesn't hedge gamma.

The views expressed here are personal analysis and should not be considered investment advice.