Why Market-Maker 13F Holdings Are Not Conviction

The fastest way to misread a 13F filing is to treat market-maker holdings as institutional conviction. When SUSQUEHANNA INTERNATIONAL GROUP shows $4.4B in Coinbase, that is not $4.4B of long-only conviction capital. When JANE STREET GROUP shows $3.5B, that is not $3.5B of fundamental thesis. Both are reported notional from the firms' options market-making books, hedged against derivative inventory, and they flip with options-dealer gamma in days, not quarters.

Reading 13F data well requires being able to identify market-maker holdings on sight, discount them out of the conviction read, and use them productively as a separate signal — usually about options-driven flow, not about institutional positioning.

The Major Market-Maker Filers

Five firms appear regularly in 13F filings as the dominant US options market makers:

• SUSQUEHANNA INTERNATIONAL GROUP, LLP — global options-trading firm, large options market-maker books across listed equity options.
• JANE STREET GROUP, LLC — quantitative trading firm with market-making operations across equities, ETFs, options, and crypto. The $662B of total reported value across the firm's filings reflects the scale of the inventory book.
• CITADEL SECURITIES — separate filing entity from Citadel Advisors (the multi-strategy hedge fund). Citadel Securities is the market-making arm; Citadel Advisors is the active asset manager. The two are distinct on 13F filings.
• CTC LLC, WOLVERINE TRADING, OPTIVER, IMC, DRW, GTS, FLOW TRADERS, JUMP TRADING, TWO SIGMA SECURITIES, VIRTU FINANCIAL — additional market-making firms that appear in 13F filings, with notional ranging from hundreds of millions to multi-billion on individual high-volume options names.

13F Insight tags these filers with filer_type=market_maker. The platform's Smart Money surfaces filter them out by default, precisely because their reported value is not conviction capital. See the filer classification taxonomy →

Why Market-Maker 13F Notional Is Hedged Inventory

An options market maker quotes two-sided markets in listed options across thousands of strikes and expiries. When customer flow buys calls (puts), the dealer sells calls (puts) and hedges by buying (selling) the underlying equity. The dealer's net delta exposure to the underlying equity at any moment is approximately zero — the long stock position is offset by the short option exposure, and the firm's economic risk is in volatility, gamma, and skew, not in directional equity exposure.

What gets reported in the 13F is the long stock leg of those hedges. The corresponding short option positions and other derivatives are not 13F-reportable (13F captures only long equity positions above the threshold). The result is a 13F filing that lists billions of dollars of stock positions that bear no relationship to the firm's actual investment view.

For high-volume options names — NVDA, TSLA, COIN, AAPL, MSFT, AMD, PLTR — the market-maker hedging book runs in the multiple-billions per name. Susquehanna alone often reports $1B+ of stock exposure across each of the top 20 options-active names in any given quarter. That number is not a long. It is a delta-hedge.

The Citadel Distinction Matters

The single most important nuance in reading market-maker filings is recognizing that Citadel files two separate 13Fs:

• CITADEL ADVISORS LLC (CIK 0001423053) — Ken Griffin's multi-strategy hedge fund. This is active conviction capital. Position sizes reflect the firm's investment views. Filed AUM around $666B.
• CITADEL SECURITIES LLC — the market-making arm. This is hedged inventory across options, equities, and ETFs. Filed AUM is a separate disclosure.

Reading a Coinbase or Tesla holder file and seeing 'CITADEL' often leads investors to assume the multi-strategy fund is positioning. They have to inspect the CIK or full filer name to know which Citadel entity is reporting. The platform's filer-type classifier resolves this distinction automatically.

Real-World Examples of Market-Maker Notional Misreads

Three high-profile equities show how market-maker concentration distorts the conviction read:

• Coinbase Global (COIN). Top 10 holders include SUSQUEHANNA $4.4B, JANE STREET $3.5B, CTC $1.3B, WOLVERINE $1.2B. Total $10.4B of options-dealer inventory in a top 10. That number is larger than BlackRock's reported position, and it does not represent institutional conviction.
• NVIDIA (NVDA). Options market-maker positions across SUSQUEHANNA, JANE STREET, CITADEL SECURITIES, CTC routinely run in the multi-billion-per-firm range. Reading these as institutional positioning leads to misreading what is actually retail-driven options flow being hedged.
• GameStop (GME). Option-driven trading on GME produces large market-maker hedging books that show up as 13F-reported positions. The 'institutional ownership' signal is meaningfully smaller than the headline holder count suggests once market makers are filtered out.

How to Use Market-Maker 13F Data Productively

Market-maker 13F filings are not useless — they signal options-driven flow that is real and tradable. Three productive applications:

• Quarterly options-flow estimation. Quarter-over-quarter changes in market-maker position size reflect changes in net delta-hedge requirement, which is downstream of customer options flow. Rising market-maker stock positions on an equity often indicate retail call buying; falling positions often indicate retail put buying or call expiration.
• Volatility regime identification. When market-maker reported positions are unusually large relative to historical, the underlying volatility regime is typically elevated, with broader options demand pulling more delta-hedge stock onto dealer books.
• Cross-asset confirmation. Market-maker reported size in stock often confirms what the equity-options flow tape shows in real time — the 13F is a delayed confirmation, not a leading indicator, but it confirms the regime.

Two Common Misreads

The first misread is concluding that market-maker presence in a 13F is a bearish signal. It is not. Market-maker presence reflects options activity, which can be bullish, bearish, or neutral depending on the customer flow being hedged. The 13F notional alone tells you nothing about direction.

The second misread is using market-maker reported value to estimate institutional float. Market-maker positions are delta-equivalent stock — they will be unwound mechanically as options expire or close. They are not part of the durable institutional float. Filing market-makers out before estimating institutional concentration produces a more accurate read.

The Practical Workflow

• Before reading any 13F holder file, identify named market makers (Susquehanna, Jane Street, CTC, Wolverine, Citadel Securities, Optiver, IMC, DRW, GTS, Two Sigma Securities, Virtu, Jump Trading, Flow Traders).
• Use the filer-type classifier to filter them out of conviction analysis automatically.
• Use their position size separately as a read on options-driven flow rather than as institutional conviction.
• Pay particular attention to the Citadel distinction — Citadel Advisors is conviction capital, Citadel Securities is hedged inventory.

Reading market-maker 13Fs correctly is the difference between treating $10B of COIN as institutional support versus understanding it as $10B of options-dealer inventory that will flip when the options book turns over. That distinction matters in every catalyst-driven equity trade. See current institutional conviction signals filtered for market-maker noise →.