What does CUSIP 45841N107 represent in this 13F holders report?

CUSIP 45841N107 is the security identifier for IBKR - Interactive Brokers Group, Inc. - Common Stock used to aggregate holder disclosures.

How many institutions held IBKR - Interactive Brokers Group, Inc. - Common Stock in Q3 2019?

237 institutional investors reported IBKR - Interactive Brokers Group, Inc. - Common Stock for Q3 2019. Use the holders table for investor-level position and value details.

Interactive Brokers Group, Inc. - Common Stock (IBKR)

CUSIP: 45841N107

Q3 2019 13F Holders as of 30 Sep 2019

Type / Class: Equity / Common Stock
Shares outstanding: 445,757,274
Total 13F shares: 67,525,798
Share change: +711,518
Total reported value: $3,627,801,856
Put/Call ratio: 143%
Price per share: $53.78
Number of holders: 237
Value change: +$35,953,567
Number of buys: 117
Number of sells: 99

Security key

45841N107

Report period

Q3 2019

Institutions

237

Top holders

IBKR full security history Newer quarter: Q4 2019 Previous quarter: Q2 2019 Interactive Brokers Group, Inc. SEC filings Interactive Brokers Group, Inc. company facts

Broader feeds

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

Reporting periods

Holder history for CUSIP 45841N107

Newer quarter: Q4 2019 Previous quarter: Q2 2019

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Ownership snapshot

Top shareholders of IBKR - Interactive Brokers Group, Inc. - Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with the largest verified stakes, then open the linked filing trail.

Lead holder

BAILLIE GIFFORD & CO

13D/G signal

—

Evidence rows

Latest as of

30 Jun 2019

13F Lead comparable stake: 1.7%

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
BAILLIE GIFFORD & CO	13F Company 13F	1.7%	$403,589,000 7,403,934 shares	—	30 Jun 2019
Bares Capital Management, Inc.	13F Company 13F	1.6%	$392,621,000 7,243,924 shares	—	30 Jun 2019
BlackRock Finance, Inc.	13F Company 13F	1.5%	$354,130,000 6,533,771 shares	—	30 Jun 2019
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC	13F Company 13F	1.3%	$312,450,000 5,764,756 shares	—	30 Jun 2019
VANGUARD GROUP INC	13F Company 13F	0.97%	$234,831,000 4,332,688 shares	—	30 Jun 2019
CANTILLON CAPITAL MANAGEMENT LLC	13F Company 13F	0.58%	$139,490,000 2,573,615 shares	—	30 Jun 2019
Echinus Advisors, LLC	13F Company 13F	0.54%	$130,705,000 2,411,525 shares	—	30 Jun 2019
Select Equity Group, L.P.	13F Company 13F	0.5%	$119,595,498 2,206,559 shares	—	30 Jun 2019
STATE STREET CORP	13F Company 13F	0.41%	$97,868,000 1,805,684 shares	—	30 Jun 2019
Ancient Art, L.P.	13F Company 13F	0.36%	$87,765,000 1,619,273 shares	—	30 Jun 2019
DIMENSIONAL FUND ADVISORS LP	13F Company 13F	0.35%	$85,279,000 1,573,475 shares	—	30 Jun 2019
Arlington Value Capital, LLC	13F Company 13F	0.3%	$72,054,000 1,329,415 shares	—	30 Jun 2019
TPG Group Holdings (SBS) Advisors, Inc.	13F Company 13F	0.26%	$62,742,000 1,157,607 shares	—	30 Jun 2019
Amova Asset Management Americas, Inc.	13F Company 13F	0.23%	$55,095,000 1,016,504 shares	—	30 Jun 2019
Sumitomo Mitsui Trust Group, Inc.	13F Company 13F	0.23%	$55,095,000 1,016,504 shares	—	30 Jun 2019
GEODE CAPITAL MANAGEMENT, LLC	13F Company 13F	0.17%	$41,405,000 762,445 shares	—	30 Jun 2019
Bank of New York Mellon Corp	13F Company 13F	0.17%	$41,142,000 759,083 shares	—	30 Jun 2019
WELLS FARGO & COMPANY/MN	13F Company 13F	0.17%	$40,462,000 746,534 shares	—	30 Jun 2019
BLOOM TREE PARTNERS, LLC	13F Company 13F	0.16%	$38,335,000 707,293 shares	—	30 Jun 2019
Invesco Ltd.	13F Company 13F	0.16%	$37,521,000 692,284 shares	—	30 Jun 2019
Mitsubishi UFJ Trust & Banking Corp	13F Company 13F	0.15%	$37,379,000 689,648 shares	—	30 Jun 2019
Russell Investments Group, Ltd.	13F Company 13F	0.15%	$37,121,000 685,865 shares	—	30 Jun 2019
Greenwich Wealth Management LLC	13F Company 13F	0.14%	$32,860,000 606,279 shares	—	30 Jun 2019
CAT ROCK CAPITAL MANAGEMENT LP	13F Company 13F	0.14%	$32,857,000 606,214 shares	—	30 Jun 2019
Grantham, Mayo, Van Otterloo & Co. LLC	13F Company 13F	0.14%	$32,670,000 602,772 shares	—	30 Jun 2019
NORTHERN TRUST CORP	13F Company 13F	0.13%	$32,206,000 594,217 shares	—	30 Jun 2019
Bronte Capital Management Pty Ltd.	13F Company 13F	0.12%	$28,253,000 521,264 shares	—	30 Jun 2019
NORGES BANK	13F Company 13F	0.1%	$24,062,000 443,954 shares	—	30 Jun 2019
GOLDMAN SACHS GROUP INC	13F Company 13F	0.1%	$23,603,000 435,489 shares	—	30 Jun 2019
Park West Asset Management LLC	13F Company 13F	0.1%	$23,295,000 429,806 shares	—	30 Jun 2019
Oakcliff Capital Partners, LP	13F Company 13F	0.08%	$18,642,000 343,955 shares	—	30 Jun 2019
PRINCIPAL FINANCIAL GROUP INC	13F Company 13F	0.07%	$17,607,000 324,860 shares	—	30 Jun 2019
TRAN CAPITAL MANAGEMENT, L.P.	13F Company 13F	0.07%	$17,255,000 318,350 shares	—	30 Jun 2019
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F Company 13F	0.07%	$16,973,000 313,143 shares	—	30 Jun 2019
Miura Global Management, LLC	13F Company 13F	0.07%	$16,260,000 300,000 shares	—	30 Jun 2019
Nuveen Asset Management, LLC	13F Company 13F	0.06%	$15,232,000 281,026 shares	—	30 Jun 2019
MILLENNIUM MANAGEMENT LLC	13F Company 13F	0.06%	$14,971,000 276,213 shares	—	30 Jun 2019
Woodson Capital Management, LP	13F Company 13F	0.06%	$13,550,000 250,000 shares	—	30 Jun 2019
THRIVENT FINANCIAL FOR LUTHERANS	13F Company 13F	0.05%	$11,587,000 213,779 shares	—	30 Jun 2019
RHUMBLINE ADVISERS	13F Company 13F	0.04%	$10,149,000 187,250 shares	—	30 Jun 2019
AMERIPRISE FINANCIAL INC	13F Company 13F	0.04%	$9,955,000 183,666 shares	—	30 Jun 2019
GABELLI FUNDS LLC	13F Company 13F	0.04%	$9,661,000 178,249 shares	—	30 Jun 2019
NEW YORK STATE COMMON RETIREMENT FUND	13F Company 13F	0.04%	$8,959,000 165,296 shares	—	30 Jun 2019
BOSTON FINANCIAL MANGEMENT LLC	13F Company 13F	0.04%	$8,953,000 165,180 shares	—	30 Jun 2019
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM	13F Company 13F	0.04%	$8,661,000 159,800 shares	—	30 Jun 2019
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F Company 13F	0.03%	$8,417,423 155,303 shares	—	30 Jun 2019
AMERICAN INTERNATIONAL GROUP, INC.	13F Company 13F	0.03%	$7,958,000 146,824 shares	—	30 Jun 2019
Lansing Management LP	13F Company 13F	0.03%	$7,818,000 144,242 shares	—	30 Jun 2019
Swiss National Bank	13F Company 13F	0.03%	$7,192,000 132,700 shares	—	30 Jun 2019
ALLIANCEBERNSTEIN L.P.	13F Company 13F	0.03%	$6,751,000 124,560 shares	—	30 Jun 2019

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 Q3 2019

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

Institutions

237

67,525,798

Rows loaded

237

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q3 2019 vs Q2 2019 Across Filers

Q2 2019 holders

237

Q3 2019 holders

237

Holder diff

Investor	Q2 2019 Shares	Q3 2019 Shares	Share Diff	Share Chg %	Q2 2019 Value $	Q3 2019 Value $	Value Diff $	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.