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Retension Pharmaceuticals (RTSN)

Retension Pharmaceuticals on one page: daily short volume, large holders and insider trades. Listed on Nasdaq.

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42.0%

Short share of volume

2026-10-23

2 people

Insiders buying, 30 days

$370K combined, latest 2026-10-13

$370K

Insider flow, 90 days

2 buys, 0 sells

As of 2026-10-23.

Daily short volume

FINRA Reg SHO, the last 11 sessions. JSON

As of 23 October 2026, the short share of RTSN volume is 42.0%, up 18.0 points over the last five sessions. Over the last 11 readings it ranged from 18.1% (15 October 2026) to 58.7% (20 October 2026). The latest reading is in line with the 11-session average of 41.3%, on 32K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-10-2314K32K42.0%0
2026-10-2219K36K53.7%662
2026-10-2129K50K58.1%0
2026-10-2028K47K58.7%0
2026-10-1962K134K46.7%0
2026-10-1623K96K24.0%0
2026-10-1510K56K18.1%0
2026-10-1415K35K42.6%0
2026-10-1322K89K24.5%0
2026-10-1233K110K30.0%0
2026-10-09127K225K56.3%0

Insider trades

SEC Form 4, newest first. JSON

Insiders at RTSN reported 2 open-market buys worth $370K in the last 90 days and no open-market sells. Latest filing: BERENDT MICHAEL J (Director) on 2026-10-13.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-10-13BERENDT MICHAEL JDirectorConversion3Kprice not stated in the filingnot stated7K
2026-10-13BERENDT MICHAEL JDirectorConversion4Kprice not stated in the filingnot stated4K
2026-10-13BERGER FRANKLIN MDirectorBuy10K$12.00$120K10K
2026-10-13BERGER FRANKLIN MDirectorConversion13Kprice not stated in the filingnot stated13K
2026-10-13Bisson SabineCHIEF OPERATING OFFICERConversion3Kprice not stated in the filingnot stated4K
2026-10-13Bisson SabineCHIEF OPERATING OFFICERConversion2Kprice not stated in the filingnot stated2K
2026-10-13Olds DonaldDirectorConversion6Kprice not stated in the filingnot stated6K
2026-10-13Sweetnam PaulCHIEF SCIENTIFIC OFFICERConversion3Kprice not stated in the filingnot stated3K
2026-10-13Sweetnam PaulCHIEF SCIENTIFIC OFFICERConversion4Kprice not stated in the filingnot stated407K
2026-10-13Keller Eric L.CHIEF EXECUTIVE OFFICERConversion31Kprice not stated in the filingnot stated464K
2026-10-13Keller Eric L.CHIEF EXECUTIVE OFFICERConversion10Kprice not stated in the filingnot stated433K
2026-10-13Keller Eric L.CHIEF EXECUTIVE OFFICERBuy21K$12.00$250K423K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

6 holders report 5% or more of RTSN in their latest filing, 1 on Schedule 13D (active intent). The largest reported stake is Branden B. Muhl at 10.0% of the class (833,333 shares), filed 2026-10-16 for an event on 2026-10-13.

FiledFormHolderSharesOf classEvent
2026-10-1613GBranden B. Muhlparent holding company, individual833K10.0%2026-10-13
2026-10-1613GB Group Capital LLCother entity833K10.0%2026-10-13
2026-10-1613GThe B Group, Inc.investment adviser, parent holding company833K10.0%2026-10-13
2026-10-1613GPVG ASSET MANAGEMENT CORPinvestment adviser, corporation, investment company1.0M8.3%2026-10-09
2026-10-1513GLaurence W. Lyttonindividual617K7.4%2026-10-13
2026-10-1413DEric Kellerindividual599K7.1%2026-10-13

What this page is

Retension Pharmaceuticals in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Retension Pharmaceuticals (RTSN), SEC CIK 2002988, listed on Nasdaq. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-23.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-16.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-13.JSON and CSV
Company record
EDGAR filing index for CIK 2002988Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
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How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

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Datasets

Frequently Asked Questions

How much of RTSN is sold short?
FINRA has not reported a short position for RTSN at the latest settlement.
What is RTSN's daily short volume?
On 2026-10-23, 13,552 of the 32,286 RTSN shares reported to FINRA were sold short, 42.0% of the day's reported volume. Short volume is a flow for one day, not a position.
Does RTSN have fails to deliver?
RTSN does not appear in the SEC fails-to-deliver files on record.
Are RTSN insiders buying or selling?
Insiders at RTSN reported 2 open-market buys worth $370K in the last 90 days and no open-market sells. Latest filing: BERENDT MICHAEL J (Director) on 2026-10-13.
Who owns 5% or more of RTSN?
6 holders report 5% or more of RTSN in their latest filing, 1 on Schedule 13D (active intent). The largest reported stake is Branden B. Muhl at 10.0% of the class (833,333 shares), filed 2026-10-16 for an event on 2026-10-13.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.