Oakcliff Capital Partners, LP: INTERACTIVE BROKERS GROUP IN (IBKR): Quarterly 13F Position History
As of Q1 2026, Oakcliff Capital Partners, LP reported 1,030,740 shares of INTERACTIVE BROKERS GROUP IN (IBKR), worth $69.1M and representing 30.5% of its 13F equity book. The position first appeared in Q1 2017 and has been disclosed across 37 13F-HR filings in Pactolio's tracked window.
- 1,030,740Shares Held (Latest Filing)
- $69.1MReported Market Value (Latest Filing)
- 30.5%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- +$2.8MQuarter-over-Quarter Value Change
- 1,030,740Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 37 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,030,740 | 0 | — | $69.1M | 30.5% | $67.1 |
| Q4 2025 | 1,030,740 | 0 | — | $66.3M | 28.4% | $64.3 |
| Q3 2025 | 1,030,740 | 0 | — | $70.9M | 30.6% | $68.8 |
| Q2 2025 | 1,030,740 | +773,055 | +300.0% | $57.1M | 28.5% | $55.4 |
| Q1 2025 | 257,685 | 42,000 | -14.0% | $42.7M | 22.5% | $165.6 |
| Q4 2024 | 299,685 | 2,962 | -1.0% | $52.9M | 27.1% | $176.7 |
| Q3 2024 | 302,647 | 0 | — | $42.2M | 21.2% | $139.4 |
| Q2 2024 | 302,647 | 0 | — | $37.1M | 19.8% | $122.6 |
| Q1 2024 | 302,647 | 37,000 | -10.9% | $33.8M | 20.3% | $111.7 |
| Q4 2023 | 339,647 | 0 | — | $28.2M | 17.7% | $82.9 |
| Q3 2023 | 339,647 | 0 | — | $29.4M | 20.2% | $86.6 |
| Q2 2023 | 339,647 | 0 | — | $28.2M | 18.8% | $83.1 |
| Q1 2023 | 339,647 | 0 | — | $28.0M | 19.5% | $82.6 |
| Q4 2022 | 339,647 | 21,600 | -6.0% | $24.6M | 18.3% | $72.3 |
| Q3 2022 | 361,247 | 0 | — | $23.1M | 19.4% | $63.9 |
| Q2 2022 | 361,247 | +61,400 | +20.5% | $19.9M | 14.7% | $55.0 |
| Q1 2022 | 299,847 | +38,000 | +14.5% | $19.8M | 10.2% | $65.9 |
| Q4 2021 | 261,847 | 0 | — | $20.8M | 9.5% | $79.4 |
| Q3 2021 | 261,847 | 0 | — | $16.3M | 7.2% | $62.3 |
| Q2 2021 | 261,847 | 0 | — | $17.2M | 7.4% | $65.7 |
| Q1 2021 | 261,847 | 105,500 | -28.7% | $19.1M | 9.1% | $73.0 |
| Q4 2020 | 367,347 | 20,939 | -5.4% | $22.4M | 8.9% | $60.9 |
| Q3 2020 | 388,286 | 0 | — | $18.8M | 8.1% | $48.3 |
| Q2 2020 | 388,286 | 0 | — | $16.2M | 8.6% | $41.8 |
| Q1 2020 | 388,286 | +4,331 | +1.1% | $16.8M | 11.7% | $43.2 |
| Q4 2019 | 383,955 | +40,000 | +11.6% | $17.9M | 10.7% | $46.6 |
| Q3 2019 | 343,955 | 0 | — | $18.5M | 12.5% | $53.8 |
| Q2 2019 | 343,955 | 0 | — | $18.6M | 13.7% | $54.2 |
| Q1 2019 | 343,955 | 0 | — | $17.8M | 13.0% | $51.9 |
| Q4 2018 | 343,955 | +58,000 | +20.3% | $18.8M | 15.5% | $54.6 |
| Q3 2018 | 285,955 | +56,486 | +24.6% | $15.8M | 11.7% | $55.3 |
| Q2 2018 | 229,469 | 15,027 | -6.1% | $14.8M | 11.2% | $64.4 |
| Q1 2018 | 244,496 | 74,973 | -23.5% | $16.4M | 14.1% | $67.2 |
| Q4 2017 | 319,469 | 144,419 | -31.1% | $18.9M | 16.6% | $59.2 |
| Q3 2017 | 463,888 | 20,466 | -4.2% | $20.9M | 17.6% | $45.0 |
| Q2 2017 | 484,354 | 0 | — | $18.1M | 16.8% | $37.4 |
| Q1 2017 | 484,354 | — | — | $16.8M | 16.1% | $34.7 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Oakcliff Capital Partners, LP first disclose a IBKR position in 13F-HR filings?
Oakcliff Capital Partners, LP first reported INTERACTIVE BROKERS GROUP IN (IBKR) on its 13F-HR filing for the period ending 2017-03-31 (Q1 2017). The position has appeared on 37 reported quarters within Pactolio's tracked window.
What was Oakcliff Capital Partners, LP's most recent quarter-over-quarter share-count change in IBKR?
Oakcliff Capital Partners, LP held the same 1,030,740 shares of IBKR between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent Oakcliff Capital Partners, LP's cost basis in IBKR?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.