The Oncology Institute, Inc. (STLN) Ownership
STLN ownership summary
as of October 18, 2026- Institutions
- 46.9% of shares outstanding
- Insiders
- 17.79% of shares outstanding
- Shares outstanding
- 101.9M
- Float
- 88.9M shares available to trade
- Short interest
- 7.58% 6.8M shares short
- Days to cover
- 5.23 short interest down 3.7% vs prior month
- Institutions 46.91%
- Insiders 17.79%
- Other investors 35.31%
STLN top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 4.66% | 4.7M | $30.5M | +333,163 (+7.5%) | June 30, 2026 |
| 2 | Deerfield Management Co | 3.30% | 3.4M | $21.6M | — | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 3.20% | 3.3M | $21.0M | −211,250 (−6.1%) | June 30, 2026 |
| 4 | JOSH ARNOLD INVESTMENT CONSULTANT, LLC | 2.42% | 2.5M | $15.8M | — | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 1.86% | 1.9M | $12.2M | +142,151 (+8.1%) | June 30, 2026 |
| 6 | The Goldman Sachs Group Inc | 1.70% | 1.7M | $11.2M | +383,438 (+28.4%) | June 30, 2026 |
| 7 | Wexford Capital LP | 1.68% | 1.7M | $11.0M | — | June 30, 2026 |
| 8 | State Street Corp | 1.52% | 1.6M | $10.0M | +91,463 (+6.3%) | June 30, 2026 |
| 9 | Nuveen, LLC | 1.38% | 1.4M | $9.1M | +1.3M (+1,378.8%) | June 30, 2026 |
| 10 | Renaissance Technologies Corp | 1.34% | 1.4M | $8.8M | +463,104 (+51.3%) | June 30, 2026 |
| 11 | CenterBook Partners LP | 1.22% | 1.2M | $8.0M | −326,763 (−20.8%) | June 30, 2026 |
| 12 | Marshall Wace Asset Management Ltd | 1.20% | 1.2M | $7.9M | +880,233 (+257.2%) | June 30, 2026 |
| 13 | Vanguard Portfolio Management, LLC | 0.99% | 1.0M | $6.5M | +144,198 (+16.7%) | June 30, 2026 |
| 14 | Citadel Advisors Llc | 0.88% | 894K | $5.7M | +285,834 (+47.0%) | June 30, 2026 |
| 15 | Jane Street Group LLC | 0.84% | 852K | $5.5M | +427,269 (+100.6%) | June 30, 2026 |
| 16 | BRC Group Holdings Inc | 0.73% | 743K | $4.8M | −187,141 (−20.1%) | June 30, 2026 |
| 17 | Arrowstreet Capital Limited Partnership | 0.70% | 711K | $4.6M | +291,465 (+69.5%) | June 30, 2026 |
| 18 | Two Sigma Investments LLC | 0.66% | 669K | $4.3M | +361,085 (+117.3%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.58% | 592K | $3.8M | +33,079 (+5.9%) | June 30, 2026 |
| 20 | Acadian Asset Management LLC | 0.56% | 567K | $3.6M | +567,001 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 5.7M shares and 3 cut 725K.
STLN top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.35% | 2.4M | $15.4M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 1.97% | 2.0M | $12.9M | −23,168 (−1.1%) | September 30, 2026 |
| 3 | Fidelity Small Cap Index | 0.82% | 838K | $5.4M | +8,493 (+1.0%) | July 31, 2026 |
| 4 | Nuveen Quant Small Cap Equity R6 | 0.61% | 625K | $4.0M | −403,900 (−39.2%) | August 31, 2026 |
| 5 | iShares Russell 2000 Growth ETF | 0.55% | 556K | $3.6M | −703 (−0.1%) | September 30, 2026 |
| 6 | Fidelity Enhanced Small Cap Core ETF | 0.48% | 486K | $3.1M | +1,017 (+0.2%) | September 30, 2026 |
| 7 | Vanguard Russell 2000 ETF | 0.43% | 440K | $2.8M | +10,284 (+2.4%) | August 31, 2026 |
| 8 | Stt Strt® SPDR® S&P®HlthCrSvcsETF | 0.41% | 421K | $2.7M | −12,780 (−2.9%) | September 30, 2026 |
| 9 | Fidelity Extended Market Index | 0.34% | 342K | $2.2M | −131 (−0.0%) | August 31, 2026 |
| 10 | Invesco Dorsey Wright SmallCap Momt ETF | 0.31% | 317K | $2.0M | −842 (−0.3%) | September 30, 2026 |
| 11 | Vanguard US Momentum Factor ETF | 0.27% | 279K | $1.8M | −110,386 (−28.4%) | June 30, 2026 |
| 12 | iShares Micro-Cap ETF | 0.24% | 241K | $1.6M | −1,665 (−0.7%) | September 30, 2026 |
| 13 | Vanguard Health Care ETF | 0.20% | 203K | $1.3M | +888 (+0.4%) | August 31, 2026 |
| 14 | CREF Total Global Stock Account R3 | 0.19% | 192K | $1.2M | — | July 31, 2026 |
| 15 | Schwab Small Cap Index | 0.18% | 186K | $1.2M | — | August 31, 2026 |
| 16 | iShares Russell 2000 Value ETF | 0.17% | 173K | $1.1M | +262 (+0.2%) | September 30, 2026 |
| 17 | Goldman Sachs Small Cap Eq Insghts Instl | 0.16% | 159K | $1.0M | +159,056 (0.0%) | July 31, 2026 |
| 18 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.15% | 155K | $993,480 | +7,392 (+5.0%) | August 31, 2026 |
| 19 | iShares Russell 2000 Small-Cap Idx Instl | 0.13% | 135K | $868,976 | — | August 31, 2026 |
| 20 | Fidelity Total Market Index | 0.13% | 134K | $859,582 | +6,454 (+5.1%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
Who owns STLN
Institutional investors own 46.9% of Oncology Institute's shares and insiders 17.79%. The largest holder is BlackRock Inc with 4.66% of the shares (4.7M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 3 reduced their stake in the latest filings. Short interest is 7.58% of the float, or 5.23 days of average trading volume.
Related: STLN analyst forecast, STLN key metrics. See the STLN stock overview for the latest quote and news.
STLN ownership FAQ
Who owns the most Oncology Institute stock?
The largest shareholders of Oncology Institute are BlackRock Inc (4.66%), Deerfield Management Co (3.30%), Vanguard Capital Management, LLC (3.20%), JOSH ARNOLD INVESTMENT CONSULTANT, LLC (2.42%), Geode Capital Management, LLC (1.86%).
What percentage of Oncology Institute is owned by institutions?
Institutions hold 46.9% of Oncology Institute's shares outstanding; insiders hold 17.79%.
Which funds own Oncology Institute?
The largest fund holders of Oncology Institute are Vanguard MStar Total Stk Mkt Idx Invest (2.35%), iShares Russell 2000 ETF (1.97%), Fidelity Small Cap Index (0.82%), Nuveen Quant Small Cap Equity R6 (0.61%), iShares Russell 2000 Growth ETF (0.55%).
What is Oncology Institute's short interest?
6.8M shares of Oncology Institute were sold short, 7.58% of the float; at the average daily volume it would take 5.23 days to cover.
How many shares of Oncology Institute are outstanding?
Oncology Institute has 101.9M shares outstanding, of which 88.9M are in the public float.