Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Mersana Therapeutics, Inc.

MRSN · — · CIK 0001442836 · Healthcare

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

0 Form 4 transaction lines observed in the same window
0 sales · 0 option, withholding, award, gift or other lines

Last qualifying purchase2022-06-02 · Hack Andrew A. F. · $47.2K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

No Form 4 transaction event is present in the current 180-day window.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2022-06-02 · Hack Andrew A. F..

Recent Form 4 activity

0Purchases
1Sales
19Other Form 4 lines
14SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

The FINRA report lists no short interest for this ticker.

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2022-06-02Hack Andrew A. F.Purchase (P)Common Stock14,760USD 3.20USD 47,232SEC filing ↗
2022-05-31Hack Andrew A. F.Purchase (P)Common Stock80,759USD 3.28USD 264,890SEC filing ↗
2022-05-26Hack Andrew A. F.Purchase (P)Common Stock75,000USD 3.19USD 239,250SEC filing ↗
2022-05-25Hack Andrew A. F.Purchase (P)Common Stock90,155USD 3.18USD 286,693SEC filing ↗
2022-05-24Hack Andrew A. F.Purchase (P)Common Stock100,000USD 3.29USD 329,000SEC filing ↗
2022-05-23Hack Andrew A. F.Purchase (P)Common Stock15,599USD 3.35USD 52,257SEC filing ↗
2022-05-20Hack Andrew A. F.Purchase (P)Common Stock100,000USD 3.46USD 346,000SEC filing ↗
2022-05-19Hack Andrew A. F.Purchase (P)Common Stock100,000USD 3.49USD 349,000SEC filing ↗
2022-05-18Hack Andrew A. F.Purchase (P)Common Stock211,268USD 3.35USD 707,748SEC filing ↗
2022-05-17Hack Andrew A. F.Purchase (P)Common Stock3,440USD 3.18USD 10,939SEC filing ↗
2022-05-16Hack Andrew A. F.Purchase (P)Common Stock135,292USD 3.10USD 419,405SEC filing ↗
2022-04-13Hack Andrew A. F.Purchase (P)Common Stock617,284USD 4.05USD 2,500,000SEC filing ↗
2022-04-12Hack Andrew A. F.Purchase (P)Common Stock598,086USD 4.18USD 2,499,999SEC filing ↗
2022-02-07Hack Andrew A. F.Purchase (P)Common Stock1,136,363USD 4.42USD 5,022,724SEC filing ↗
2021-12-30Hack Andrew A. F.Purchase (P)Common Stock815,000USD 6.15USD 5,012,250SEC filing ↗

Form 4 evidence

20 transaction lines in the latest 365-day window; 381 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-01-06Protopapas AnnaU (U)Common Stock19,220USD —USD —SEC filing ↗
2026-01-06Mandelia AshishU (U)Common Stock2,300USD —USD —SEC filing ↗
2026-01-06MOTT DAVID MU (U)Common Stock23,929USD —USD —SEC filing ↗
Show recent Form 4 evidence (15 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-01-06Protopapas AnnaU (U)Common Stock19,220USD —USD —SEC filing ↗
2026-01-06Mandelia AshishU (U)Common Stock2,300USD —USD —SEC filing ↗
2026-01-06MOTT DAVID MU (U)Common Stock23,929USD —USD —SEC filing ↗
2026-01-06Lowinger Timothy BU (U)Common Stock10,466USD —USD —SEC filing ↗
2026-01-06Huber Martin H. Jr.U (U)Common Stock9,573USD —USD —SEC filing ↗
2026-01-06Hege KristenU (U)Common Stock578USD —USD —SEC filing ↗
2026-01-06Hack Andrew A. F.U (U)Common Stock347,123USD —USD —SEC filing ↗
2026-01-06Diaz Allene M.U (U)Common Stock578USD —USD —SEC filing ↗
2026-01-06Dere Willard HU (U)Common Stock1,567USD —USD —SEC filing ↗
2026-01-06DeSchuytner BrianU (U)Common Stock5,015USD —USD —SEC filing ↗
2026-01-06Carvajal AlejandraU (U)Common Stock3,131USD —USD —SEC filing ↗
2026-01-06Bala MohanU (U)Common Stock2,927USD —USD —SEC filing ↗
2026-01-06Alleva Lawrence MU (U)Common Stock662USD —USD —SEC filing ↗
2025-10-27Bala MohanSale (S)Common Stock77USD 9.90USD 762SEC filing ↗
2025-10-25Bala MohanOption exercise / conversion (M)Common Stock250USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMRSN
CIK0001442836
SectorHealthcare
Industry— Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
Exchange—

Data coverage

Local Form 4 history381 transaction lines from 2020-04-07 to 2026-01-06
26 P purchase lines · 105 S sale lines · 250 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.