What does CUSIP 784117103 represent in this 13F holders report?

CUSIP 784117103 is the security identifier for SEIC - SEI INVESTMENTS CO - Common Stock used to aggregate holder disclosures.

How many institutions held SEIC - SEI INVESTMENTS CO - Common Stock in Q1 2021?

434 institutional investors reported SEIC - SEI INVESTMENTS CO - Common Stock for Q1 2021. Use the holders table for investor-level position and value details.

SEI INVESTMENTS CO - Common Stock (SEIC)

CUSIP: 784117103

Q1 2021 13F Holders as of 31 Mar 2021

Security type / class: Equity / Common Stock
Total 13F shares: 98,014,219
Total 13F value: $5,970,919,170
Share change: +216,161
Put/Call ratio: 223%
SEC-reported price per share: $60.93
Number of holders: 434
Value change: +$17,213,923
Number of buys: 173
Number of sells: 207
Shares outstanding: 120,200,577

Security key

784117103

Report period

Q1 2021

Institutions

434

Top holders

SEIC full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2026 SEI INVESTMENTS CO SEC filings SEI INVESTMENTS CO company facts SEI INVESTMENTS CO 13D/G history

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 784117103

Newer quarter: Q3 2026

Recent filing periods:

Q3 2026

Ownership snapshot

Top reported holders of SEIC - SEI INVESTMENTS CO - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

LOOMIS SAYLES & CO L P

Disclosed value leader

LOOMIS SAYLES & CO L P

Comparable rows

0/15

Latest evidence

31 Dec 2020

13F Highest disclosed value: $854,477,000 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

LOOMIS SAYLES & CO L P has the largest disclosed position value at $854.48M.

0 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens LOOMIS SAYLES & CO L P's linked filing trail.

Disclosed position value Top 5

LOOMIS SAYLES & CO L P $854.48M

VANGUARD GROUP INC $728.92M

BlackRock Finance, Inc. $723M

ATLANTA CAPITAL MANAGEMENT CO L L C $323.15M

STATE STREET CORP $316.64M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
LOOMIS SAYLES & CO L P	13F Company 13F	— denominator unverified	$854,477,000 14,868,214 shares	—	31 Dec 2020
VANGUARD GROUP INC	13F Company 13F	— denominator unverified	$728,917,000 12,683,416 shares	—	31 Dec 2020
BlackRock Finance, Inc.	13F Company 13F	— denominator unverified	$723,002,000 12,580,487 shares	—	31 Dec 2020
ATLANTA CAPITAL MANAGEMENT CO L L C	13F Company 13F	— denominator unverified	$323,150,000 5,622,933 shares	—	31 Dec 2020
STATE STREET CORP	13F Company 13F	— denominator unverified	$316,639,000 5,474,377 shares	—	31 Dec 2020
BANK OF AMERICA CORP /DE/	13F Company 13F	— denominator unverified	$219,225,000 3,814,599 shares	—	31 Dec 2020

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2021

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

434

98,014,219

Rows available

434

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2021 vs Q1 2021 Across Filers

Q1 2021 holders

434

Q1 2021 holders

434

Holder diff

Investor	Q1 2021 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q1 2021 value	Q1 2021 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend