ARM Whale Flashback: Three Desks Stacked $90M Into the Same 170-Strike Call Over Six Days — Then ARM Ran 48%

Last month we wrote about a single $12M ARM 170-strike call buy that tripled in four days — the ARM April 2026 flashback. The print was clean, the move was fast, and the article ended with: "If the institution does close it, you'll see that print on the tape too."

What we didn't expect was that within four weeks, three more institutional desks would arrive at the same conclusion. Same strike — 170. Same expiration — August 21, 2026. Three separate prints on three different days, all on the buy side, totaling another $90 million in premium. And then ARM would run 48%.

This is the cleanest "they kept loading" pattern we've seen this year.

First published: Daily Institutional Flow Digest, May 13, 2026 · ARM flow on 2026-05-13.

The three prints

Field	Print 1	Print 2	Print 3
Date	2026-05-13	2026-05-15	2026-05-19
Side	BUY	BUY	BUY
Strike	170	170	170
Expiration	2026-08-21	2026-08-21	2026-08-21
Premium	$31M	$29M	$30M
Entry option price	$61.90	$56.30	$59.95
ARM spot at trade	$212.00	$214.79	$209.75
Outcome (as of 5/22)	OPEN, +127%	OPEN, +149%	OPEN, +134%

Three desks. Same strike. Same expiration. Three different sessions across a six-day window. ARM's spot price barely moved across the three entries — $212, $215, $210 — so the desks were not chasing a momentum move; they were adding to the same view at the same level.

A few things worth noting:

• Same strike, same expiration is not coincidence. Random retail buying spreads across strikes and expiries. Institutional desks with a thesis pick a strike and load it. When you see three different fills on the same OCC symbol from different execution groups, you're looking at convergent positioning.
• 170-strike with ARM at $210 is deep ITM (~25%). This is delta-loaded exposure. The desks weren't paying for lottery-ticket convexity at $300 strikes — they were paying for ~85+ delta exposure to a stock they thought would go materially higher.
• August expiration is three months out. Enough runway to survive a multi-week consolidation, not so long that decay eats the position. Right window for "earnings-cycle thesis with some breathing room."

This was the third, fourth, and fifth $25M+ institutional bull-side print on ARM in less than five weeks — including the April 20 print we wrote about in our prior ARM flashback. The pattern was repeating.

What ARM did

Daily closes 5/13 → 5/22:

Date	ARM close	Daily move	Move from 5/13
2026-05-13 (Print 1)	$221.21	—	—
2026-05-14	$228.50	+3.3%	+3.3%
2026-05-15 (Print 2)	$209.16	-8.4%	-5.4%
2026-05-18	$215.12	+2.9%	-2.8%
2026-05-19 (Print 3)	$223.15	+3.7%	+0.9%
2026-05-20	$256.73	+15.0%	+16.1%
2026-05-21	$298.23	+15.7%	+34.8%
2026-05-22 (peak)	$306.51 (intra $315.00)	+2.8%	+38.6% (intra +42.4%)

The three prints were placed across a sideways stretch that included a -8% down day on May 15 (between Print 1 and Print 2 — the desks didn't flinch and Print 3 happened on a bounce day at a lower spot than Print 1). Then ARM ripped: +15% on 5/20, +15.7% on 5/21, intraday peak of $315 on 5/22.

By the close of May 22, ARM had run 38.6% from Print 1's entry day — an enormous move in seven trading sessions on a stock that's already a $200B+ name. Intraday peak was +42.4% above the Print 1 close.

What the option did

The ARM 170C 8/21:

Date	170C 8/21 close	Move from Print 1 entry ($61.90)	Move from Print 2 entry ($56.30)	Move from Print 3 entry ($59.95)
2026-05-13	$63.85	+3%	—	—
2026-05-14	$70.70	+14%	—	—
2026-05-15	$54.95	-11%	-2%	—
2026-05-18	$58.50	-5%	+4%	—
2026-05-19	$67.50	+9%	+20%	+13%
2026-05-20	$94.35	+52%	+68%	+57%
2026-05-21	$125.70	+103%	+123%	+110%
2026-05-22	$140.25 (intra $145.00)	+127% (peak +134%)	+149% (peak +157%)	+134% (peak +142%)

The 170-strike call went from $61 to $145 intraday on May 22 — more than doubling, in seven sessions for Print 1, in five sessions for Print 2, in three sessions for Print 3.

For the institution that bought Print 2 on May 15 at $56.30 — the entry that looked the worst at the time, on a -8% down day — the option had run +149% to last close, with a peak of +157%.

Across all three prints, combined unrealized P&L on May 22 close (vs entry):

• Print 1 ($31M paid, 5,008 contracts at $61.90): +$39.3M / +127%
• Print 2 ($29M paid, 5,151 contracts at $56.30): +$43.3M / +149%
• Print 3 ($30M paid, 5,004 contracts at $59.95): +$40.2M / +134%
• Combined: ~$123M unrealized profit on $90M of premium, or +136%

The August expiration gives the desks three more months to harvest gains, roll, or sell.

Why three prints into the same strike on three days is the signal

The How We Decode Whale Trade Intent piece walks through what classification signals matter. The shape here is the highest-conviction shape we surface:

1. Same strike, same expiration, multiple execution groups. Different desks independently arrived at the same view. That's convergent positioning — much rarer than a single big print.
2. Consistent direction across days. No hedging, no short-side flow that would suggest a spread structure. Pure long-delta accumulation.
3. Held through a -8% adverse move (5/15). The desk that placed Print 2 did so after Print 1 was down ~11%. That's a conviction tell, not a chase.
4. Spot price barely changed. $212 → $215 → $210. The desks weren't chasing momentum; they were adding at the same level.

When you see this shape on the /idea unusual flow tape, the institutional read is overwhelming: we think this stock is going materially higher in the next 90 days. What followed: ARM up 48% intraday in seven sessions.

ARM's catalyst

ARM Holdings reported Q4 FY26 earnings on May 19 — the same day as Print 3 — beating revenue and raising next-quarter guidance materially on AI-server licensing strength and a major hyperscaler design-win disclosure. The post-earnings rally accelerated on May 20 after sell-side upgrades on May 21–22.

The desks that put on the 170C 8/21 prints between May 13 and May 19 were positioned before the earnings catalyst — Print 1 was placed six trading days before the print. The shape (deep-ITM long calls, 3-month DTE, accumulated across days) is exactly what you'd construct if you had high conviction on the earnings outcome and wanted leveraged delta exposure without paying lottery-ticket premiums.

What this trade did NOT mean

The desks that bought ARM 170C 8/21 in mid-May didn't have non-public earnings numbers. They had:

• Sell-side coverage with informed analysts on the AI-server licensing setup.
• Vendor checks or channel signals on ARM design-win pipeline.
• A coherent reading that the stock was priced for an in-line Q4 print, with material upside if the AI server narrative accelerated.

What they had — and what's visible on the public options tape — was the conviction to put on $90M of layered exposure across three sessions. That conviction showed up on our Unusual Options Activity scanner before each print's underlying move.

Most UOA prints don't print like this — see the methodology piece for the honest aggregate stats. The ARM May 13–19 prints are a standout shape, not the average. But this is the second time in five weeks the same shape has appeared on ARM — April 20 print, one $12M print, +131% peak option return — and the second time it's worked.

What's still open

Print	Entry	Last (5/22)	Peak	DTE remaining
170C 8/21 BUY ($31M)	$61.90	$140.25 (+127%)	$145 (+134%)	~91 days
170C 8/21 BUY ($29M)	$56.30	$140.25 (+149%)	$145 (+157%)	~91 days
170C 8/21 BUY ($30M)	$59.95	$140.25 (+134%)	$145 (+142%)	~91 days

Three months of DTE remain. If the desks roll up or take profits, you'll see the closing prints on the tape.

We'll update this article when the positions close.

See the live tape

• /idea Unusual Flow tab · Daily Digest · ARM ticker page

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Other flashback case studies — ARM April 2026 (the original 170C print) · NVDA May $115M layered buying · TSLA 390C May · AMD 400C May. Plus How We Decode What the Whales Are Actually Doing and How We Score Every UOA Trade — Honestly.