XOOMAR

Werewolf Therapeutics, Inc. (HOWL)

Every FINRA and SEC series the site collects for Werewolf Therapeutics, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.

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1.1M

Short interest

settlement 2026-08-14

3.7

Days to cover

-2.9% vs prior

40.4%

Short share of volume

2026-09-11

112

Fails to deliver

settlement 2026-08-12

$0

Insider flow, 90 days

0 buys, 0 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 14 August 2026, short interest in HOWL is 1,067,589 shares, up 133,249 shares over the last month. Over the last 48 readings it ranged from 667,626 shares (15 May 2026) to 2,419,408 shares (30 January 2026). At the reported average volume of 289K shares a day that is 3.7 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-141,067,589-2.9%288,6053.70
2026-07-311,099,472+17.7%844,0691.30
2026-07-15934,340+10.3%910,8201.03
2026-06-30847,096-12.2%1,096,5121.00
2026-06-15964,624+1.6%495,7471.95
2026-05-29949,598+42.2%609,2171.56
2026-05-15667,626-8.2%678,4651.00
2026-04-30726,859-7.7%306,0872.37
2026-04-15787,448-43.1%370,6482.12
2026-03-311,383,049-1.4%271,0245.10
2026-03-131,402,079-32.3%497,9462.82
2026-02-272,069,809+1.0%412,0945.02
2026-02-132,050,094-15.3%329,8236.22
2026-01-302,419,408+5.8%522,5654.63
2026-01-152,286,905+7.9%486,8054.70
2025-12-312,118,631+45.1%1,301,7831.63
2025-12-151,459,615+42.4%476,1783.07
2025-11-281,025,313+32.5%475,8092.15
2025-11-14774,065-14.3%689,0931.12
2025-10-31902,853+9.6%767,6321.18
2025-10-15824,144-3.7%1,722,5191.00
2025-09-30855,811+4.0%1,359,5481.00
2025-09-15822,835-3.0%175,3174.69
2025-08-29848,163-13.6%119,9677.07

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of HOWL volume is 40.4%, down 9.2 points over the last five sessions. Over the last 52 readings it ranged from 8.1% (2 July 2026) to 72.8% (11 August 2026). The latest reading is 7.4 points above the 30-session average of 33.0%, on 319K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11129K319K40.4%0
2026-09-10212K392K53.9%0
2026-09-09144K358K40.2%0
2026-09-08108K347K31.0%161
2026-09-0468K217K31.3%0
2026-09-03347K700K49.6%10
2026-09-02287K785K36.5%0
2026-09-01173K511K33.8%50
2026-08-31170K597K28.4%30
2026-08-28617K1.4M44.4%264
2026-08-27325K965K33.7%3,510
2026-08-262.4M8.1M30.1%23,320
2026-08-251.3M3.8M33.4%20,779
2026-08-242.3M6.7M34.4%55,642
2026-08-2181.6M145.1M56.2%354,808
2026-08-2021K99K21.4%0
2026-08-1927K104K26.0%0
2026-08-182K14K11.5%0
2026-08-1737K155K23.7%0
2026-08-1425K127K20.0%0
2026-08-1315K71K21.3%0
2026-08-12140K268K52.3%0
2026-08-1169K95K72.8%0
2026-08-107K71K9.6%0
2026-08-0724K185K12.7%0
2026-08-0610K42K24.7%0
2026-08-0511K74K15.1%0
2026-08-0456K312K18.1%0
2026-08-03101K252K40.2%13,947
2026-07-31551K1.3M42.5%110,489

Fails to deliver

SEC, by settlement date. JSON

As of 12 August 2026, the fails-to-deliver balance in HOWL is 112 shares, down 194 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (23 February 2026) to 380,485 shares (22 June 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-12112$0.38$43
2026-08-11306$0.38$116
2026-08-0363$0.35$22
2026-07-293,498$0.45$2K
2026-07-2749,823$0.43$21K
2026-07-233,108$0.37$1K
2026-07-2117,436$0.37$6K
2026-07-0794$0.32$30
2026-07-01168,564$0.36$61K
2026-06-3026,535$0.31$8K
2026-06-26930$0.33$307
2026-06-25258,032$0.37$95K
2026-06-22380,485$0.35$133K
2026-06-18100,013$0.34$34K
2026-06-1673,860$0.39$29K
2026-06-1573,760$0.38$28K
2026-06-10234,000$0.37$87K
2026-06-0916,622$0.38$6K
2026-04-3046,729$0.68$32K
2026-04-21205$0.97$199
2026-04-1487$0.92$80
2026-04-073,603$1.04$4K
2026-04-061,806$1.01$2K
2026-04-025,183$0.96$5K
2026-03-272,152$0.86$2K
2026-03-2545$0.77$35
2026-03-20449$0.81$364
2026-02-2626,326$0.64$17K
2026-02-231$0.67$1
2026-02-057,792$0.64$5K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

No open-market insider trades were reported for HOWL in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: RA CAPITAL MANAGEMENT, L.P. on 2026-06-11.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-06-11RA CAPITAL MANAGEMENT, L.P.n/aSell17K$0.38$7K361K
2026-06-11RA CAPITAL MANAGEMENT, L.P.n/aSell245K$0.38$93K5.1M
2026-06-10RA CAPITAL MANAGEMENT, L.P.n/aSell3K$0.37$1K379K
2026-06-10RA CAPITAL MANAGEMENT, L.P.n/aSell43K$0.37$16K5.3M
2026-06-09EVNIN LUKEn/aSell77K$0.37$28K300K
2026-06-09RA CAPITAL MANAGEMENT, L.P.n/aSell25K$0.37$9K382K
2026-06-09RA CAPITAL MANAGEMENT, L.P.n/aSell345K$0.37$128K5.4M
2026-06-08EVNIN LUKEn/aSell61K$0.40$24K377K
2026-06-05EVNIN LUKEn/aSell25K$0.40$10K438K
2026-06-04EVNIN LUKEn/aSell20K$0.44$9K463K
2026-06-03EVNIN LUKEn/aSell30K$0.42$12K483K
2026-06-02EVNIN LUKEn/aSell30K$0.45$13K513K
2026-06-01EVNIN LUKEn/aSell80K$0.47$38K542K
2026-05-29EVNIN LUKEn/aSell33K$0.45$15K623K
2026-05-28EVNIN LUKEn/aSell28K$0.46$13K655K
2026-05-27EVNIN LUKEn/aSell81K$0.48$39K683K
2026-05-26EVNIN LUKEn/aSell68K$0.47$32K764K
2026-05-22EVNIN LUKEn/aSell87K$0.45$39K832K
2026-05-21EVNIN LUKEn/aSell36K$0.42$15K919K
2026-05-20EVNIN LUKEn/aSell86K$0.43$37K955K
2026-05-19EVNIN LUKEn/aSell63K$0.45$28K1.0M
2026-05-18EVNIN LUKEn/aSell22K$0.50$11K1.1M
2026-05-13EVNIN LUKEn/aSell45K$0.54$24K1.1M
2026-05-12RA CAPITAL MANAGEMENT, L.P.n/aSell7K$0.64$4K406K
2026-05-12RA CAPITAL MANAGEMENT, L.P.n/aSell94K$0.64$60K5.7M
2026-05-12EVNIN LUKEn/aSell68K$0.64$43K1.2M
2026-05-11RA CAPITAL MANAGEMENT, L.P.n/aSell6K$0.67$4K413K
2026-05-11RA CAPITAL MANAGEMENT, L.P.n/aSell82K$0.67$55K5.8M
2026-05-11EVNIN LUKEn/aSell34K$0.67$23K1.2M
2026-05-08RA CAPITAL MANAGEMENT, L.P.n/aSell25K$0.71$18K419K
2026-05-08RA CAPITAL MANAGEMENT, L.P.n/aSell352K$0.71$250K5.9M
2026-05-08EVNIN LUKEn/aSell306K$0.70$214K1.3M
2026-05-07EVNIN LUKEn/aSell79K$0.63$50K1.6M
2026-05-06EVNIN LUKEn/aSell15K$0.66$10K1.7M
2026-05-05EVNIN LUKEn/aSell7K$0.69$5K1.7M
2026-05-04EVNIN LUKEn/aSell48K$0.72$35K1.7M
2026-05-01EVNIN LUKEn/aSell58K$0.73$43K1.7M
2026-04-30EVNIN LUKEn/aSell168K$0.72$121K1.8M
2026-04-29EVNIN LUKEn/aSell57K$0.69$39K2.0M
2026-04-28EVNIN LUKEn/aSell95K$0.73$70K2.0M
2026-04-27EVNIN LUKEn/aSell54K$0.85$46K2.1M
2026-01-16EVNIN LUKEn/aSell39K$0.54$21K2.2M
2026-01-15EVNIN LUKEn/aSell37K$0.55$21K2.2M
2026-01-14EVNIN LUKEn/aSell31K$0.57$17K2.2M
2026-01-13EVNIN LUKEn/aSell43K$0.55$24K2.3M
2026-01-12EVNIN LUKEn/aSell59K$0.57$34K2.3M
2026-01-09EVNIN LUKEn/aSell25K$0.61$15K2.4M
2026-01-08EVNIN LUKEn/aSell8K$0.63$5K2.4M
2026-01-07EVNIN LUKEn/aSell12K$0.64$8K2.4M
2026-01-06EVNIN LUKEn/aSell41K$0.65$26K2.4M

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 the rarer, stronger signal.

13F holders

Tracked managers holding HOWL at their latest 13F. JSON

4 of the 30 tracked managers held HOWL at their latest 13F, $308K in total at quarter-end prices. Renaissance Technologies is the largest at $243K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 1 cut.

FundQuarterSharesValueOf portfolioChange in shares
Renaissance Technologies2026-06-30675K$243K0.00%+158K
Citadel Advisors2026-06-3091K$33K0.00%+80K
Millennium Management2026-06-3062K$22K0.00%-70K
Two Sigma Investments2026-06-3027K$10K0.00%+7K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In FY 2025 it generated -$60.3M of operating cash flow.

Cash
$22.0M
Equity
$16.3M
Total assets
$24.2M
Shares outstanding
48,599,066

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-06-30n/a$3.7Mn/a0.08
Q1 20262026-03-31n/a-$13.5Mn/a-0.28
Q4 2025derived2025-12-31n/a-$8.4Mn/an/a
Q3 20252025-09-30n/a-$16.4Mn/a-0.36
Q2 20252025-06-30n/a-$18.0Mn/a-0.40
Q1 20252025-03-31n/a-$18.1Mn/a-0.40
Q4 2024derived2024-12-31n/a-$20.4Mn/an/a
Q3 20242024-09-30n/a-$16.7Mn/a-0.38

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31n/a-$60.8M-$60.3M$0n/an/a
FY 20242024-12-31n/a-$70.5M-$56.2M$254Kn/an/a
FY 20232023-12-31n/a-$37.4M-$32.6M$769Kn/an/a
FY 20222022-12-31n/a-$53.8M-$40.6M$3.6Mn/an/a
FY 20212021-12-31n/a-$50.0M-$42.9M$498Kn/an/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-27 from the cover page.

What this page is

Werewolf Therapeutics, Inc. 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows Werewolf Therapeutics, Inc. (HOWL), SEC CIK 1785530, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-12.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-06-11.JSON and CSV
Company record
EDGAR filing index for CIK 1785530Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.

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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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.

Other companies the SEC classifies as pharmaceutical preparations

Datasets

Frequently Asked Questions

How much of HOWL is sold short?
1,067,589 shares were held short at the 2026-08-14 settlement, 3.7 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is HOWL's daily short volume?
On 2026-09-11, 128,775 of the 318,896 HOWL shares reported to FINRA were sold short, 40.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does HOWL have fails to deliver?
The SEC's latest file shows 112 HOWL shares failed to deliver at settlement 2026-08-12. Fails are reported per settlement date and published twice a month with a lag.
Are HOWL insiders buying or selling?
No open-market insider trades were reported for HOWL in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: RA CAPITAL MANAGEMENT, L.P. on 2026-06-11.
What did HOWL report last quarter?
In FY 2025 it generated -$60.3M of operating cash flow.
Which funds hold HOWL?
4 of the 30 tracked managers held HOWL at their latest 13F, $308K in total at quarter-end prices. Renaissance Technologies is the largest at $243K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 1 cut.

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