Whale Analyzer
OSK Institutional Holders and 13F Ownership
Compare 8 tracked holders of OSK, their reported positions and disclosed changes. Coverage is limited to the investors tracked by Whale Analyzer; these records do not establish all shareholders or current trades. Available original SEC filings for tracked 13F holders are linked below. Top tracked holders include Greenhaven Associates, Capital Research Global Investors, Pzena Investment Management, and Horizon Kinetics Asset Management.
Continue to the live OSK dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| Greenhaven Associates 13F holdings | $325.6M | 2.5M | Reduced | 2026-09-30 |
| Capital Research Global Investors 13F holdings | $266.6M | 1.7M | Increased | 2026-06-30 |
| Pzena Investment Management 13F holdings | $53.0M | 411.0K | Reduced | 2026-09-30 |
| Horizon Kinetics Asset Management 13F holdings | $13.6M | 88.8K | Reduced | 2026-06-30 |
| Atlantic Investment Management 13F holdings | $12.8M | 83.7K | Reduced | 2026-06-30 |
| Mairs & Power Funds 13F holdings | $5.1M | 33.2K | Held | 2026-06-30 |
| Bridgewater Associates 13F holdings | $2.0M | 12.7K | Reduced | 2026-06-30 |
| Oakmark Funds 13F holdings | $241.7K | 1.6K | Held | 2026-06-30 |
Original SEC filing sources
These recorded filings support the tracked 13F rows included in the aggregate reported values on this page. See each holder profile for source coverage and context for other disclosure types.
- Greenhaven Associates SEC filing (0001213900-26-112422) · report date 2026-09-30
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Pzena Investment Management SEC filing (0001027796-26-000065) · report date 2026-09-30
- Horizon Kinetics Asset Management SEC filing (0001398344-26-014047) · report date 2026-06-30
- Atlantic Investment Management SEC filing (0001493152-26-038311) · report date 2026-06-30
- Mairs & Power Funds SEC filing (0001172661-26-003496) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Oakmark Funds SEC filing (0000813917-26-000042) · report date 2026-06-30
Tracked-sample concentration
Reported position value for OSK is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 48.0% of aggregate reported value in this sample
- Top 5 tracked holders: 98.9% of aggregate reported value in this sample
- Top 10 tracked holders: 100.0% of aggregate reported value in this sample
Whale activity this quarter
Across 8 tracked holders, 5 reduced, 2 held, 1 increased. Net positioning is net selling.
- Greenhaven Associates ($325.6M) (▼ 1.2% qoq shares) · modeled avg cost estimate $146.78
- Capital Research Global Investors ($266.6M) (▲ 24.1% qoq shares) · modeled avg cost estimate $128.07
- Pzena Investment Management ($53.0M) (▼ 1.1% qoq shares) · modeled avg cost estimate $146.56
- Horizon Kinetics Asset Management ($13.6M) (▼ 23.3% qoq shares) · modeled avg cost estimate $49.69
- Atlantic Investment Management ($12.8M) (▼ 38.6% qoq shares)
- Mairs & Power Funds ($5.1M) (→ 0.0% qoq shares)
- Bridgewater Associates ($2.0M) (▼ 35.1% qoq shares)
- Oakmark Funds ($241.7K) (→ 0.0% qoq shares)
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 4 covered tracked holders is $138.13 versus a current price of $134.36, so OSK trades below that estimate (-2.7%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Other
OSK sits within the Other sector alongside 1558 other tracked names. Compare reported positions across tracked peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time or market-wide ownership totals. Open the live OSK dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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Learn more in Whale Analyzer Academy
Deepen your read on OSK with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns OSK stock?
Whale Analyzer tracks 8 public-disclosure holders of OSK with a combined reported value of $678.9M. See the holder table above for the largest tracked positions.
Which top funds are buying OSK?
Tracked holders were net selling last quarter — 5 reduced, 2 held, 1 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked OSK sample?
The top five tracked holders account for 98.9% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does OSK compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 4 covered tracked holders is $138.13 versus a current price of $134.36 (-2.7%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for OSK?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive OSK dashboard to explore them, or read our 13F Alpha Signals Guide.