Phio Pharmaceuticals

PHIO · NASDAQ

$0.8921+$0.0232 (+2.67%)TodayMarket closed · Oct 20, 7:30 PM ET

Prev close $0.8689

Who owns PHIO

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 12.1% of PHIO’s shares.

Orca Capital GmbH4.6%
Bitterman (Robert J)2.7%
Jane Street Capital, L.L.C.1.0%
Geode Capital Management, L.L.C.1.0%
Next 6 largest institutions2.8%
All other shareholders87.9%

Top institutional holders of PHIO
Holder	Shares	% of shares	Change, last filing	Filed
Orca Capital GmbH	538.71K	4.64%	−161.71K	Dec 8, 2025
Bitterman (Robert J)	311.42K	2.68%	+260.00K	Aug 18, 2026
Jane Street Capital, L.L.C.	117.75K	1.01%	−1.43K	Jun 30, 2026
Geode Capital Management, L.L.C.	114.57K	0.99%	−32.68K	Jun 30, 2026
Vanguard Capital Management, LLC	94.26K	0.81%	+14.41K	Jun 30, 2026
Nomura Investment Management Business Trust	50.00K	0.43%	+0	Jun 30, 2026
Cetera Investment Advisers LLC	47.50K	0.41%	+2.50K	Jun 30, 2026
Citadel Advisors LLC	47.15K	0.41%	+47.15K	Jun 30, 2026
Carson (Lisa Cabott)	47.00K	0.40%	−47.00K	Aug 4, 2026
Vanguard Fiduciary Trust Co	38.17K	0.33%	+0	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of PHIO
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Extended Market Index Fund	94.26K	0.81%	+0	Jul 31, 2026
Fidelity Extended Market Index Fund	61.36K	0.53%	−115	Jul 31, 2026
Nomura Healthcare Fund	50.00K	0.43%	+0	Jun 30, 2026
Fidelity Series Total Market Index Fund	14.66K	0.13%	+0	Jul 31, 2026
Fidelity Total Market Index Fund	13.29K	0.11%	+0	Jul 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders bought $48.70K (5 trades) of PHIO on the open market, with no sales.

Latest PHIO insider transactions
Insider	Date	Type	Shares	Price	Value
Plott Ronald Todd	Sep 28, 2026	Award	17.00K	—	—
Carson Lisa Cabott	Sep 28, 2026	Award	108.00K	—	—
Bitterman Robert J	Sep 28, 2026	Award	400.00K	—	—
BRADFORD PATRICIA A	Sep 24, 2026	Buy	6.50K	$1.01	$6.58K
Bitterman Robert J	Sep 22, 2026	Buy	2.00K	$1.03	$2.06K
BRADFORD PATRICIA A	Sep 15, 2026	Buy	12.00K	$1.03	$12.36K
Carson Lisa Cabott	Sep 11, 2026	Tax withholding	12.89K	$1.03	$13.27K
Bitterman Robert J	Sep 11, 2026	Tax withholding	68.55K	$1.03	$70.61K
Plott Ronald Todd	Aug 19, 2026	Buy	15.00K	$1.14	$17.10K
Bitterman Robert J	Aug 18, 2026	Buy	10.00K	$1.06	$10.60K

Short interest

Settled Sep 30, 2026

Shares short: 89.45K
Days to cover: 1.00
% of shares outstanding: 0.77%
Average daily volume: 114.59K
Change since last report: −40.3%

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