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AMBA — structural market context

Ambarella, Inc.

Structural market context from public regulatory and market data, shown with its as-of dates. Descriptive only: nothing on this page is a recommendation, a prediction, or advice to buy or sell any security.

What changed

As of the close on Oct 21. Each line shows the earlier value, the later value and their dates.

Price

Close $66.00 (Oct 21) vs $63.22 (Oct 20): +4.40%.

Volume

2.38× its 20-session average (1.4M) on Oct 21.

Includes pre- and post-market trading.

Short interest

Short interest 5.2M shares (settlement Sep 30) vs 5.7M (Sep 15).

No new publication in this window. Latest: settlement Sep 30, published Oct 10.

Fails-to-deliver

Latest file (settlements Sep 15–Sep 30, published Oct 16): 3 days with fails, largest 165K shares on Sep 18.

Previous file (settlements Sep 1–Sep 14, published Sep 30): 2 days with fails, largest 2K shares on Sep 3.

No new publication in this window.

Analyst rating actions

None recorded in this window.

Insider filings (Form 4)

None recorded in this window.

AMBA short interest & days to cover

SHARES SHORT
5.2M
% OF FLOAT
12.2%
DAYS TO COVER
3.5
CHANGE VS PRIOR
-9.7%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-09-30 (22d ago)

AMBA fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-09-29 · 23d8K$68.68
2026-09-24 · 28d8K$67.62
2026-09-18 · 34d165K$66.91

SEC fails-to-deliver files, published twice a month with ~6 weeks of delay.

AMBA insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 0 purchases · 6 sales

InsiderTypeSharesValueFiled
PAISLEY CHRISTOPHER B · directorSale (S)250$18K2026-09-28
Young John Alexander · officer: CFOSale (S)2K$128K2026-09-21
Lee Chan W · officer: Chief Operations OfficerSale (S)3K$188K2026-09-18
Young John Alexander · officer: CFOSale (S)3K$203K2026-09-18
Wang Feng-Ming · director, officer: CEOSale (S)6K$395K2026-09-18

SEC Form 4 filings: purchases and sales reported on Form 4 (transaction codes P and S) only; grants and option exercises excluded. Attributed public records.

AMBA analyst ratings

FirmActionRatingPublished
Craig-HallumdowngradeHold (from Buy)2026-09-04
Craig-Hallumprice_target—2026-09-04
Roth Capitalprice_target—2026-09-04
NeedhamholdBuy2026-09-04
OppenheimerholdPerform2026-09-04

Rating actions as published by the firms, from public feeds. They are not graded here.

Frequently asked questions

What is AMBA's short interest?
As of the FINRA settlement date 2026-09-30, AMBA had 5.2M shares sold short — 12.2% of its float, with 3.5 days to cover at average volume. FINRA publishes this data roughly two weeks after each twice-monthly settlement, so it is inherently delayed. A short-interest figure describes an aggregate position; it does not predict what the stock will do.
Are insiders buying AMBA?
In the last 12 months of SEC Form 4 filings, AMBA recorded 0 insider purchases and 6 sales reported on Form 4 (transaction codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.
What do analysts say about AMBA?
The most recent action: Craig-Hallum downgrade to Hold on 2026-09-04. Rating actions are shown as published by the firms; they are not graded here.
Is this page telling me to buy or sell AMBA?
No. Everything on this page is descriptive, structural market context from public data, shown with its as-of dates. TradeAI News does not issue directional recommendations, price predictions, or buy/sell advice — for any ticker.
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AMBA: the full history

Latest rows shown. Full history, market-wide screens, cluster detection and the context journal live in the dashboard.

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Not financial advice. Trading involves risk. Descriptive structural context, never a recommendation.