Blum Robert I

CIK: 0001288859
Primary company: CYTOKINETICS INC (CYTK)

Blum Robert I is a corporate insider at CYTOKINETICS INC (CYTK) filing SEC Form 4 transactions. 874 transactions across 2 companies, totaling $77,500 in purchases and $45,394,300 in sales. Source: SEC EDGAR.

AI Insider Summary

Read the sale rows in Robert Blum's file as a sequence and they form a metronome: 5,000 Cytokinetics shares on July 1, 2025 at $33.55, then again on July 14, July 29, August 15, September 2, September 15, October 1, October 16, October 30 — same size every time, roughly every two weeks, while the price beneath the clips climbed from the mid-$30s to the low $60s. In March 2026 the clip resizes to 7,500 shares and keeps ticking through $59 to $84.92 by July. The fixed size and fixed calendar are the signature of a prearranged selling program, and its most striking property is what it ignored: the CEO's own sale prints more than doubled inside twelve months and the cadence never flinched. The one genuinely discretionary row points the other way — a December 2025 net exercise of 71,233 options struck at $6.67, retained rather than dumped, with the only outright purchase in the entire 864-row file being 50,000 shares of Gamida Cell in 2022.

The carrier signal is a fixed-size, fixed-interval sale. From mid-2025 the Cytokinetics CEO's record shows 5,000-share dispositions on an almost biweekly grid: $33.55 on July 1, $38.15 on July 14, $36.45 on July 29, $38.42 on August 15, $48.76 on September 2, $49.77 on September 15, $55.05 on October 1, $60.03 on October 16, $62.86 on October 30. After a winter pause the grid resumes with a larger clip — 7,931 shares at $60.72 on March 9, 2026, then straight 7,500-share lots at $66.63, $65.38, $59.62 through April, $77.21 in late May, and $84.92 on July 1, 2026. Uniform sizes on a calendar, indifferent to price, are how prearranged trading plans behave; the March resize suggests the plan itself was refreshed for 2026 at a one-and-a-half-times pace.

What the metronome ignored is the point. Between the first and last rows of this sequence, Blum's own execution prints rose from $33.55 to $84.92 — the stock he was selling roughly two-and-a-half-timed underneath the program, and the program neither accelerated into strength nor paused to let winners run. That indifference cuts both ways for a reader: none of these sales carries information about his view of the price, which is precisely why the rows that break the grid carry more.

Analysis generated by 13F Insight from SEC Form 4 filing data. Methodology
Total Transactions
874
Total Buy Value
$78K
Total Sell Value
$45.39M
Net Activity
$-45.32M
Last Transaction
Aug 2026
Companies
2

Companies

Transaction History

Source: SEC EDGAR Form 4 insider transaction filings.

Type
Exercise
Shares
7,500
Price
$10.60
Value
$80K
Type
Sale
Shares
7,500
Price
$76.76
Value
$576K
Type
Exercise
Shares
7,500
Price
$10.60
Value
$80K
Type
Exercise
Shares
7,500
Price
$10.60
Value
$80K
Type
Sale
Shares
7,500
Price
$80.87
Value
$607K
Type
Exercise
Shares
7,500
Price
$10.60
Value
$80K
Type
Exercise
Shares
7,490
Price
$10.60
Value
$79K
Type
Sale
Shares
7,490
Price
$82.02
Value
$614K
Type
Exercise
Shares
7,490
Price
$10.60
Value
$79K
Type
Sale
Shares
10
Price
$82.02
Value
$820
Type
Sale
Shares
7,500
Price
$84.92
Value
$637K
Type
Sale
Shares
7,500
Price
$77.21
Value
$579K
Type
Sale
Shares
7,500
Price
$59.62
Value
$447K
Type
Sale
Shares
7,500
Price
$65.38
Value
$490K
Type
Sale
Shares
7,500
Price
$66.63
Value
$500K
Type
Sale
Shares
7,931
Price
$60.72
Value
$482K
Type
Tax Payment
Shares
2,935
Price
$62.72
Value
$184K
Type
Award
Shares
5,765
Price
-
Value
-
Type
Award
Shares
5,765
Price
-
Value
-
Type
Exercise
Shares
16,506
Price
-
Value
-