Seagate Technology Holdings PLC (STX)
Seagate Technology Holdings PLC · STX · data through 2026-10-16 · free to read
STX unusual options activity and options flow
What is the options flow saying about STX?
On 2026-10-16, Seagate Technology Holdings PLC (STX) traded $36.0M of call premium against $98.5M of put premium, 27% of it on the call side. The tape leans puts. Volume and open interest below, updated after each close.
The session's options tape
How much open interest is standing
Across 90 sessions to 2026-10-16, STX carries 8k of call open interest against 22k of puts, a put/call ratio of 2.88. Open interest is what is still on the book, as opposed to what changed hands today.
Where the premium has gone over three months
From 2026-07-21 to 2026-10-16, cumulative call premium reached $3.4B against $3.1B on puts, a net of +$268.7M. One day's flow is noise; the cumulative line is where a lean shows up.
STX gamma exposure
Where is dealer gamma on STX?
As of 2026-10-16, dealer gamma on Seagate Technology Holdings PLC (STX) is negative, so dealer hedging amplifies moves. The sign has flipped 25 times over the window shown. A flip matters more than the level: it changes whether hedging flow works with the move or against it.
What dealer gamma has done
Total dealer gamma exposure on STX over 90 sessions, 2026-06-05 to 2026-10-16. The sign flipped 25 times in that window.
When dealer gamma is positive, hedging leans against the move and tends to compress the range. When it is negative, hedging runs with the move and tends to extend it. The flip is the event worth watching, not the level.
STX congress trades
Which members of Congress have traded STX?
4 members of Congress disclosed 9 transactions in Seagate Technology Holdings PLC (STX), 1 of them purchases. The most recent was filed 2026-10-12. Disclosures lag the trade by up to 45 days by law.
| Member | Chamber | Side | Traded | Disclosed | Size |
|---|---|---|---|---|---|
| Lisa McClain | House · MI09 | SELL | 2026-09-30 | 2026-10-12 | $15001–$50000 |
| Kevin Hern | House · OK01 | SELL | 2026-09-15 | 2026-09-25 | $1001–$15000 |
| Julie Johnson | House · TX32 | SELL | 2025-12-18 | 2026-01-15 | $1001–$15000 |
| Julie Johnson | House · TX32 | SELL | 2025-11-13 | 2025-12-11 | $1001–$15000 |
| Kevin Hern | House · OK01 | SELL | 2025-10-28 | 2025-11-16 | $15001–$50000 |
| Lisa McClain | House · MI09 | BUY | 2025-09-08 | 2025-10-22 | $15001–$50000 |
| Julie Johnson | House · TX32 | SELL | 2025-08-14 | 2025-09-11 | $1001–$15000 |
| Julie Johnson | House · TX32 | SELL | 2025-07-29 | 2025-08-14 | $1001–$15000 |
| Rob Bresnahan | House · PA08 | SELL | 2025-04-08 | 2025-05-08 | $1001–$15000 |
Members must file within 45 days of a transaction, so a disclosure date well after the trade date is normal rather than suspicious. Sizes are reported as brackets, never as exact amounts.
STX insider buying and selling
Are insiders buying or selling STX?
20 reported insider transactions in Seagate Technology Holdings PLC (STX), 0 on the buy side. Officers and directors must file within two business days, so this is the least delayed ownership signal available. Names, titles and amounts below.
| Insider | Title | Side | Value | Avg price | Seen |
|---|---|---|---|---|---|
| Mosley William D | CEO | sell | 27670452 | 925.14 | 2026-10-08 |
| Mosley William D | CEO | sell | 75584519 | 772.14 | 2026-10-05 |
| Romano Gianluca | EVP, CFO | sell | 76691029 | 801.085 | 2026-10-05 |
| Mosley William D | CEO | sell | 100072801 | 794.21 | 2026-10-02 |
| Morris John Christopher | EVP, CTO | sell | 8211951 | 877.91 | 2026-09-22 |
| Romano Gianluca | EVP, CFO | sell | 38595124 | 772.16 | 2026-09-22 |
| Teh Ban Seng | EVP, Chief Commercial Officer | sell | 41239128 | 782.08 | 2026-09-22 |
| Morris John Christopher | EVP, CTO | sell | 11941704 | 772.15 | 2026-09-16 |
| Romano Gianluca | EVP, CFO | sell | 42772942 | 835.98 | 2026-09-15 |
| Mosley William D | CEO | sell | 24488282 | 816.28 | 2026-09-09 |
| Lee James Ci | EVP, CLO | sell | 7163926 | 794.84 | 2026-08-26 |
| Mosley William D | CEO | sell | 15406022 | 849.36 | 2026-08-24 |
| Romano Gianluca | EVP, CFO | sell | 7708957 | 849.36 | 2026-08-24 |
| Teh Ban Seng | EVP, Chief Commercial Officer | sell | 13510227 | 847.97 | 2026-08-24 |
| Teh Ban Seng | EVP, Chief Commercial Officer | sell | 6778028 | 920.8 | 2026-08-14 |
| Romano Gianluca | EVP, CFO | sell | 17834092 | 812.6700000000001 | 2026-08-11 |
| Mosley William D | CEO | sell | 24511131 | 815.385 | 2026-08-07 |
| Mosley William D | CEO | sell | 27444658 | 917.45 | 2026-07-08 |
| Mosley William D | CEO | sell | 2345874 | 821.74 | 2026-06-11 |
| Mosley William D | CEO | sell | 27347824 | 912.6 | 2026-06-02 |
Officers and directors file a Form 4 within two business days of a transaction, which makes this the least delayed ownership signal available. A sale can mean many things, including a scheduled plan; a cluster of open-market buys is the rarer event.
Common questions about STX
What does the options flow on STX actually mean?
It is the money that changed hands in STX options on 2026-10-16: $36.0M paid for calls, $98.5M for puts. Premium is the better read than contract count, because a thousand cheap far-dated calls and one large near-dated block are not the same conviction, and only premium tells them apart.
Is heavy call buying in STX bullish?
Not by itself. 27% of STX's premium sat on the call side, and a good share of any day's call volume is someone hedging a short, closing a position, or a market maker managing inventory. Flow says where money went, never why. It is one input among several, which is how it is weighted on the desk.
What is the difference between volume and open interest on STX?
Volume is what traded today: 14610 calls and 20359 puts. Open interest is what is still on the book afterwards, currently 8k of calls against 22k of puts. Volume can spike and vanish the same day; open interest rising means positions were opened rather than closed.
What is dealer gamma exposure on STX?
It is the aggregate gamma the market makers who sold STX options are carrying. It matters because they hedge it, and that hedging is real buying and selling in the stock. As of 2026-10-16 it is negative.
What happens when STX gamma is positive versus negative?
Positive gamma means dealers sell into strength and buy weakness, which compresses the range and makes moves fade. Negative gamma means they do the opposite, selling weakness and buying strength, which extends moves. Same stock, opposite character, depending only on which side dealers are on.
Why do the sign flips matter more than the level?
Because the flip is when the behaviour changes. STX has flipped 25 times across the window shown here. A large positive number tells you little on its own; crossing zero tells you hedging flow just switched from working against the move to working with it.
Which members of Congress have traded STX?
4 distinct members appear in the disclosures for Seagate Technology Holdings PLC, across 9 transactions, 1 of them purchases. The table above names each one with their chamber, the trade date and the date it was disclosed.
Why is there a gap between the trade date and the disclosure date on STX?
The STOCK Act gives members up to 45 days to file. The most recent STX entry here was traded 2026-09-30 and disclosed 2026-10-12. That lag is the law working as written, not evidence of anything, and it is the main reason this data is context rather than a signal.
Why are the amounts shown as ranges?
Because that is how they are filed. Members report a bracket, such as $1,001 to $15,000, never an exact figure. Anyone quoting a precise dollar amount for a congressional trade is estimating from the bracket.
Are insiders buying or selling STX?
Across the filings shown here, 0 buy-side and 20 sell-side transactions in Seagate Technology Holdings PLC. Each row names the insider, their title and the value, because a director's purchase and a CEO's scheduled sale are not the same event even when the dollar figure matches.
Does insider selling in STX mean something is wrong?
Usually not. Executives are paid in stock and sell for tax bills, houses and diversification, much of it through pre-scheduled 10b5-1 plans set months in advance. Selling is the normal state. It is the absence of buying, over long stretches, that says more than any single sale.
Why does insider buying carry more weight?
Because there is one reason to buy your own company's stock with your own money and many reasons to sell. A cluster of open-market purchases by several STX insiders in the same window is the version worth noticing; a single small buy near a proxy deadline is often optics.
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