Oncology Institute Ownership | Who Owns Oncology Institute?

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Oncology Institute Ownership Summary

Oncology Institute is owned by 3.62% institutional investors, 8.88% insiders, and 87.50% retail investors. Kent lake capital is the largest institutional shareholder, holding 2.36% of TOI shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 3.05% of its assets in Oncology Institute shares.

TOI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Oncology Institute	3.62%	8.88%	87.50%
Sector	Healthcare Stocks	42.54%	10.83%	46.63%
Industry	Medical Care Facilities Stocks	45.06%	12.64%	42.30%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Kent lake capital	1.75M	2.36%	$805.00K
Triatomic management lp	802.97K	1.08%	$369.36K
Vanguard group	4.55M	0.49%	$15.86M
Blackrock funding, inc. /de	3.43M	0.37%	$11.99M
Citadel advisors	269.70K	0.36%	$124.06K
Deerfield management company, l.p. (series c)	3.36M	0.36%	$11.73M
Centerbook partners lp	2.70M	0.29%	$9.44M
Blackrock	204.81K	0.28%	$94.22K
Balyasny asset management	2.52M	0.27%	$5.16M
Kanen wealth management	1.84M	0.20%	$6.42M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Triatomic management lp	802.97K	10.89%	$369.36K
Kanen wealth management	1.84M	2.15%	$6.42M
Fourworld capital management	358.00K	1.97%	$1.25M
Wexford capital lp	1.57M	0.79%	$5.48M
Ehp funds	244.04K	0.75%	$851.70K
Manatuck hill partners	629.80K	0.73%	$2.20M
Tiff advisory services	856.63K	0.62%	$2.99M
Josh arnold investment consultant	204.25K	0.57%	$712.83K
Centerbook partners lp	2.70M	0.47%	$9.44M
Kent lake capital	1.75M	0.36%	$805.00K

Top Buyers

Holder	Shares	% Assets	Change
Centerbook partners lp	2.70M	0.47%	1.99M
Kanen wealth management	1.84M	2.15%	1.84M
Ubs group	1.06M	0.00%	635.49K
Kent lake capital	1.75M	0.36%	563.29K
Goldman sachs group	681.64K	0.00%	527.01K

Top Sellers

Holder	Shares	% Assets	Change
Tiff advisory services	856.63K	0.62%	-2.78M
Josh arnold investment consultant	204.25K	0.57%	-2.24M
Marshall wace, llp	25.16K	0.00%	-1.45M
Cincinnati insurance	-	-	-1.24M
Portolan capital management	-	-	-221.51K

New Positions

Holder	Shares	% Assets	Change	Value
Kanen wealth management	1.84M	2.15%	1.84M	$6.42M
Lpl financial	266.99K	0.00%	266.99K	$931.78K
Boothbay fund management	247.88K	0.01%	247.88K	$865.12K
Ehp funds	244.04K	0.75%	244.04K	$851.70K
Nkcfo	190.00K	0.20%	190.00K	$663.00K

Sold Out

Holder	Change
Boston financial mangement	-2.68K
Kirr marbach & co llc /in/	-2.73K
Mariner	-10.88K
Two sigma securities	-14.71K
Hudson bay capital management lp	-15.20K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	106	43.24%	33,706,659	8.37%	3	32.47%	63	3.28%	23	475.00%
Jun 30, 2025	78	85.71%	29,319,382	73.47%	3	65.45%	64	178.26%	5	-28.57%
Mar 31, 2025	42	40.00%	16,901,932	14.88%	2	0.58%	23	76.92%	7	133.33%
Dec 31, 2024	18	-47.06%	8,865,387	-56.94%	11	1.58%	8	-46.67%	3	-57.14%
Sep 30, 2024	33	-15.38%	20,426,970	9.22%	27	4.26%	14	7.69%	7	-46.15%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	2.84M	3.05%	-145.90K
Fidelity Growth Compy Commingled Pl S	2.05M	2.72%	2.05M
Fidelity Growth Company Fund	1.80M	2.38%	1.80M
iShares Russell 2000 ETF	1.47M	1.57%	-
Fidelity Small Cap Index	592.10K	0.63%	592.10K
Vanguard Institutional Extnd Mkt Idx Tr	546.96K	0.59%	-249.23K
Fidelity Growth Company K6	431.19K	0.57%	431.19K
iShares Russell 2000 Growth ETF	510.21K	0.55%	-
Fidelity Series Growth Company	377.38K	0.50%	377.38K
State St Russell Sm/Mid Cp® Indx SL Cl I	303.31K	0.33%	303.31K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 18, 2025	Pacala Mark L	-	Sell	$186.52K
Nov 18, 2025	Pacala Mark L	-	Sell	$8.64K
Nov 18, 2025	Pacala Mark L	-	Sell	$4.84K
Sep 04, 2025	M33 Growth I L.P.		Sell	$2.11M
Sep 04, 2025	M33 Growth I L.P.		Sell	$18.60M

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	3
2025 Q3	-	3
2025 Q2	-	6
2025 Q1	18	-
2024 Q4	2	-

TOI Ownership FAQ

Who Owns Oncology Institute?

Oncology Institute shareholders are primarily institutional investors at 3.62%, followed by 8.88% insiders and 87.50% retail investors. The average institutional ownership in Oncology Institute's industry, Medical Care Facilities Stocks, is 45.06%, which Oncology Institute falls below.

Who owns the most shares of Oncology Institute?

Oncology Institute’s largest shareholders are Kent lake capital (1.75M shares, 2.36%), Triatomic management lp (802.96K shares, 1.08%), and Vanguard group (4.55M shares, 0.49%). Together, they hold 3.93% of Oncology Institute’s total shares outstanding.

Does Blackrock own Oncology Institute?

Yes, BlackRock owns 0.28% of Oncology Institute, totaling 204.81K shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 94.22K$. In the last quarter, BlackRock increased its holdings by 55.38K shares, a 37.06% change.

Who is Oncology Institute’s biggest shareholder by percentage of total assets invested?

Triatomic management lp is Oncology Institute’s biggest shareholder by percentage of total assets invested, with 10.89% of its assets in 802.96K Oncology Institute shares, valued at 369.36K$.

Who is the top mutual fund holder of Oncology Institute shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Oncology Institute shares, with 3.05% of its total shares outstanding invested in 2.84M Oncology Institute shares.

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