Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals

Published 25 Sep 2026, 20:47 UTC. Updated 25 Sep 2026, 22:19 UTC.

In the latest look at the underlying components of the S&P 500 ordered by largest market capitalization, Monolithic Power Systems Inc (Symbol: MPWR) has taken over the #181 spot from United Rentals Inc (Symbol: URI), according to The Online Investor. Market capitalizatio

Directly affected

MPWR Monolithic Power Systems
Named in this report.
URI United Rentals
Named in this report.

Indirectly affected

CPER UNITED STATES COPPER INDEX FUND
GA selected CPER as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
UGA UNITED STATES GASOLINE FUND LP
GA selected UGA as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
USO UNITED STATES OIL FUND LP
GA selected USO as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
AIPO DEFIANCE AI & POWER INFRASTRUCTURE ETF
GA selected AIPO as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
EAPR INNOVATOR EMERGING MARKETS POWER BUFFER ETF - APRIL
GA selected EAPR as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.
EJAN INNOVATOR EMERGING MARKETS POWER BUFFER ETF JANUARY
GA selected EJAN as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article.

Price reaction, T-5 to T+3

Ticker	T-5	T-3	T-1	T0	T+1	T+2	T+3
MPWR	—	—	—	—	—	—	—
URI	—	—	—	—	—	—	—
CPER	—	—	—	—	—	—	—
UGA	—	—	—	—	—	—	—
USO	—	—	—	—	—	—	—
AIPO	—	—	—	—	—	—	—
EAPR	—	—	—	—	—	—	—
EJAN	—	—	—	—	—	—	—

In the latest look at the underlying components of the S&P 500 ordered by largest market capitalization, Monolithic Power Systems Inc (Symbol: MPWR) has taken over the #181 spot from United Rentals Inc (Symbol: URI), according to The Onlin…

Source: Nasdaq Markets

The price since 25 Sep 2026: United Rentals (URI) versus the S&P 500

Since the first closing price after “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” United Rentals (URI) is -1.83%. The S&P 500 fund (SPY) is +0.15% over the same days, a -1.97% difference versus the market.

URI

SPY

Official trades in United Rentals (URI) around 25 Sep 2026

Public disclosure filings, not a recommendation. The filing link is the source document. News use of these reports still sits under 5 U.S.C. § 13107(c).

Who gains and who loses around United Rentals (URI)

Companies carried with this story

URI United Rentals
In “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” United Rentals (URI) is linked, with no stored direction, high confidence. Reason on file: The reported development directly names UNITED RENTALS INC in the headline; GA resolved that company to URI
CPER United States Commodity Index Funds Trust
In “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” United States Commodity Index Funds Trust (CPER) is linked, with no stored direction, medium confidence. Reason on file: GA selected CPER as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
UGA United States Gasoline Fund
United States Gasoline Fund (UGA) is linked, with no stored direction, medium confidence in the 25 Sep 2026 story “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals.” Reason on file: GA selected UGA as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
USO United States Oil Fund
For “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” United States Oil Fund (USO) is linked, with no stored direction, medium confidence. Reason on file: GA selected USO as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
AIPO Defiance Ai & Power Infrastructure Etf
In “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” Defiance Ai & Power Infrastructure Etf (AIPO) is linked, with no stored direction, medium confidence. Reason on file: GA selected AIPO as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
EAPR Innovator Emerging Markets Power Buffer Etf - April
Innovator Emerging Markets Power Buffer Etf - April (EAPR) is linked, with no stored direction, medium confidence in the 25 Sep 2026 story “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals.” Reason on file: GA selected EAPR as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article
EJAN Innovator Emerging Markets Power Buffer Etf January
For “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals,” Innovator Emerging Markets Power Buffer Etf January (EJAN) is linked, with no stored direction, medium confidence. Reason on file: GA selected EJAN as a RELATED security because its canonical security name directly matches this event's themes: power. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article

United Rentals (URI)

On 25 Sep 2026, “Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals” is the story that connects United Rentals (URI) to this story.

The link for United Rentals (URI) is this: The reported development directly names UNITED RENTALS INC in the headline; GA resolved that company to URI

United States Commodity Index Funds Trust (CPER) is here too. Its reason reads: GA selected CPER as a RELATED security because its canonical security name directly matches this event's themes: united. This is an explainable DERIVED market relationship, not a claim that the security was named in the source article

Price levels for United Rentals (URI)

CPER traded between 39.20 and 41.49 across 20 sessions. The latest close on file is 39.58. UGA traded between 140.00 and 152.81 across 20 sessions. The latest close on file is 143.49. URI traded between 968.65 and 1101.64 across 19 sessions. The latest close on file is 1025.18.

How strong the case is around United Rentals (URI)

46 out of 100

“Monolithic Power Systems Now #181 Largest Company, Surpassing United Rentals” scores 46 out of 100. The score uses 1 sources, and 7 linked companies.