FormFactor, Inc. Added to Membership of US Large-Cap Russell US 1000® Index

(Moderate)

(Neutral)

Rhea-AI Summary

FormFactor (Nasdaq: FORM) has been added to the US large-cap Russell 1000® Index, effective at the US market open on June 29, 2026, as part of the 2026 Russell indexes reconstitution.

Membership, based on the Russell 3000® Index, lasts half a year and includes automatic addition to related growth and value indexes.

News Market Reaction – FORM

+5.18%

7 alerts

+5.18% Session close to close

+4.9% Peak in 17 hr 5 min

$12.07B Market Cap

0.0x Rel. Volume

In the Jun 25 session, FORM gained 5.18%, reflecting a notable positive market reaction. Argus tracked a peak move of +4.9% during that session. Our momentum scanner triggered 7 alerts that day, indicating moderate trading interest and price volatility.

Data tracked by StockTitan Argus on the day of publication.

Market Context

The stock moved +5.2% in the session following this news. A strong positive reaction aligns with ind...

Analysis

The stock moved +5.2% in the session following this news. A strong positive reaction aligns with index-inclusion tailwinds, as Russell 1000 membership can attract benchmarked capital to FORM. Recent insider net selling and generally low short interest could limit squeeze-driven upside extension over time.

Key Figures

Index effective date: June 29, 2026 Membership duration: half a year Assets benchmarked: $12.2 trillion

3 metrics

Index effective date June 29, 2026 Date FORM is added to Russell 1000 Index at market open

Membership duration half a year Stated length of Russell 1000 Index membership beginning 2026

Assets benchmarked $12.2 trillion Assets benchmarked against Russell US indexes as of end of June 2025

Historical Context

5 past events · Latest: May 14 (Neutral)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
May 14	Conference participation	Neutral	-1.3%	Announcement of participation in several upcoming investor conferences with 1:1 meetings.
May 13	Industry recognition	Positive	-1.0%	Named #1 in Test Subsystems and focused chip equipment in TechInsights survey.
May 08	Nasdaq bell ringing	Positive	+2.4%	Planned ringing of Nasdaq Closing Bell to celebrate company milestones and team.
Apr 29	Quarterly results	Positive	+0.3%	Record Q1 2026 revenue and guidance for higher Q2 revenue and EPS.
Apr 08	Earnings date set	Neutral	+2.8%	Scheduled date and webcast details for Q1 2026 earnings release and call.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

FORM has mostly traded in line with generally positive or neutral corporate news, with one recent divergence on a customer-satisfaction ranking release.

Key Terms

russell 1000® index, russell 3000® index, ftse russell, semi-annual reconstitution

4 terms

russell 1000® index financial

"added as a member of the US large-cap Russell 1000® Index, effective when"

A stock market index that tracks the performance of the 1,000 largest publicly traded U.S. companies by market value, the Russell 1000® gives a snapshot of how big-cap and many mid-cap businesses are doing as a group. For investors it matters because the index acts like a large shopping cart of major stocks—used as a benchmark for fund performance, a basis for index funds and ETFs, and a quick gauge of broad market health and investor risk exposure.

russell 3000® index financial

"based on membership in the broad-market Russell 3000® Index."

A broad stock market index that tracks the performance of about 3,000 publicly traded U.S. companies of all sizes, acting as a wide-ranging snapshot of the U.S. equity market. It matters to investors because it serves as a common yardstick for the overall market’s health and is the basis for many index funds and investment strategies—think of it as a single basket that shows how the whole U.S. stock market is doing.

ftse russell financial

"Russell US indexes, which belong to FTSE Russell, the global index provider."

FTSE Russell is a global index provider that creates and maintains lists (indexes) showing how groups of stocks perform, similar to a scoreboard that ranks companies by size, sector and trading activity. Investors use these indexes as benchmarks and as the basis for investment products like index funds and ETFs, so when a stock is added or removed it can trigger buying or selling that affects its price and liquidity.

semi-annual reconstitution financial

"The transition to a semi-annual reconstitution frequency this year will ensure"

A semi-annual reconstitution is the twice-yearly review and reset of a market index’s list of included securities and their weights. Think of it like updating the roster on a sports team: some players are added, others removed, and positions are rebalanced; the change matters to investors because index-tracking funds and many portfolios must buy or sell shares to match the new lineup, which can move stock prices and affect trading volume and portfolio performance.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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06/24/2026 - 04:01 PM

LIVERMORE, Calif., June 24, 2026 (GLOBE NEWSWIRE) -- FormFactor, Inc. (Nasdaq: FORM) announced today that it was added as a member of the US large-cap Russell 1000^® Index, effective when the US market opens on June 29^th, as part of the 2026 Russell indexes reconstitution. Membership in the Russell 1000^® Index, which remains in place for half a year beginning 2026, is based on membership in the broad-market Russell 3000^® Index. The stock also was automatically added to the appropriate growth and value indexes.

“Joining the Russell 1000^® Index is a strong validation of our strategy, disciplined execution, and the dedication of our global team,” said Mike Slessor, CEO of FormFactor, Inc. “With our new 2030 Target Model, we are charting a bold growth trajectory—expanding our addressable markets, investing in differentiated capabilities, and building a more resilient, higher‑performing business. This milestone underscores our momentum and reinforces our commitment to long‑term, sustainable value creation.”

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. According to data as of the end of June 2025, about $12.2 trillion in assets are benchmarked against the Russell US indexes, which belong to FTSE Russell, the global index provider.

Fiona Bassett, CEO of FTSE Russell, an LSEG business, comments:

“The Russell indexes have continuously adapted to the evolving dynamic US economy, and it’s crucial to fully recalibrate the suite of Russell US Indexes, ensuring the indexes maintain an accurate representation of the market. The transition to a semi-annual reconstitution frequency this year will ensure our indexes continue to represent the market and maintain the purpose of the index as a portfolio benchmark.”

For more information on the Russell 1000^® Index and the Russell indexes reconstitution, go to the “Russell Reconstitution” section on the FTSE Russell website.

About FormFactor:

FormFactor, Inc. (NASDAQ: FORM) is a leading provider of essential test and measurement technologies along the full IC life cycle – from characterization, modeling, reliability, and design de-bug to qualification and production test. Semiconductor companies rely upon FormFactor's products and services to optimize device performance and advance yield knowledge. The Company serves customers through its network of facilities in Asia, Europe, and North America. For more information, visit the Company’s website at www.formfactor.com.

FORM-F

Investor Contact:
Stan Finkelstein
Investor Relations
(925) 290-4273
ir@formfactor.com

FAQ

What did FormFactor (NASDAQ: FORM) announce about the Russell 1000 Index on June 24, 2026?

FormFactor announced its addition to the US large-cap Russell 1000 Index, effective June 29, 2026. According to FormFactor, this follows the 2026 Russell indexes reconstitution and reflects its membership in the broader Russell 3000 Index and related style indexes.

When does FormFactor’s inclusion in the Russell 1000 Index become effective for FORM shareholders?

FormFactor’s inclusion in the Russell 1000 Index becomes effective when US markets open on June 29, 2026. According to FormFactor, this timing aligns with the 2026 Russell indexes reconstitution, after which membership is maintained for half a year.

How long will FormFactor remain in the Russell 1000 Index after the 2026 reconstitution?

FormFactor’s membership in the Russell 1000 Index will remain in place for half a year beginning in 2026. According to FormFactor, this membership is based on inclusion in the broad Russell 3000 Index and extends to associated growth and value style indexes.

What does inclusion in the Russell 1000 Index mean for FormFactor (FORM) investors?

Inclusion means FormFactor becomes part of a widely used US large-cap benchmark followed by many institutional investors. According to FormFactor, Russell US indexes guide index funds and active strategies, with about $12.2 trillion benchmarked to them as of June 2025 data.

Were FormFactor shares also added to Russell growth and value indexes in 2026?

Yes, FormFactor shares were automatically added to the appropriate Russell growth and value indexes alongside the Russell 1000. According to FormFactor, this automatic inclusion occurs as part of the Russell 3000 Index-based methodology during the 2026 reconstitution.

How much in assets is benchmarked to the Russell US indexes that now include FormFactor?

About $12.2 trillion in assets are benchmarked to the Russell US indexes, based on data as of June 2025. According to FTSE Russell, these indexes are widely used for index funds and as benchmarks for active investment strategies.