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OUST Ouster, Inc. Insider Trading

Latest: CTO Sold $15.6M of Shares · May 2026

Multiple insiders have been active at Ouster, Inc. (OUST): 6 distinct insiders account for 7 buy filings and 9 sell filings as of May 2026. Its highest-significance filing in the last 90 days: CTO Mark Frichtl sold $15.6M, transaction dated May 2026.

16 filings analyzed · Latest 2026-05-27

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Buys
7
Sells
9
Insiders
6
Direction
Net selling

Ouster, Inc. leadership

CEO
Angus Pacala — Chief Executive Officer
CFO
Kenneth Gianella — Chief Financial Officer
COO
Darien Spencer — Chief Operating Officer
General Counsel
Megan Chung — General Counsel and Secretary
Chair
Theodore L. Tewksbury — Chair of the Board

Historically, stocks have lagged the S&P 500 by a median ~3% over the 90 days after a medium insider sell (n ≈ 4,738, 2024-2026). Past results don't predict the future. How we measure this ↗

May 2026
2026-05-27 10b5-1 Plan
medium
Chief Technology Officer
384,426 shares
$15,606,971
@ $40.60
Significance 7

CTO Mark Frichtl sold 384,426 shares ($15.6M) via scheduled 10b5-1 plan at blended $40.60; stock now $44.23

Mark Frichtl, Chief Technology Officer, executed 9 separate sales totaling 384,426 shares for $15,606,971.34 across May 22–26, 2026, reducing his non-derivative holdings from 679,350 shares to 294,924 shares (a 56.6% reduction). This filing is part of a pre-arranged 10b5-1 trading plan, meaning execution was scheduled rather than discretionary. The stock has risen 64.3% over the prior 30 days and 125.3% over 90 days, trading at $44.23 versus the blended sale price of $40.60. Frichtl's cross-ticker track record shows 19 prior sells averaged +45.2% 90-day return post-sale, though his prior 5 sales at OUST specifically ranged +18.6% to +29.4% forward performance; the current stock price sits near the 52-week high of $45.42. The company is generating $48.6M quarterly revenue with 52.5% annual growth but reported a $-17.5M net loss in its most recent full fiscal year, framing this sale within an unprofitable but rapidly growing business context.

2026-05-27 10b5-1 Plan
medium
Chief Operating Officer
30,000 shares
$1,350,022
@ $45.00
Significance 5

COO Darien Spencer sells 30,000 OUST shares at $45.00; stock up 64.3% in 30 days, 125.3% in 90 days; prior trades show -7.3% 90-day returns.

Darien Spencer, as Chief Operating Officer, executed a scheduled sale of 30,000 shares under a 10b5-1 trading plan on 2026-05-26 at $45.00, reducing his holdings by 8.1% to 342,365 shares. The stock has appreciated 64.3% over the prior 30 days and 125.3% over 90 days, trading near its 52-week high of $45.42. Spencer's prior transaction at OUST (a sell on 2025-09-12) was followed by a 90-day return of -7.3%, consistent with his cross-ticker track record average of -7.3% following sells. The sale occurred during a strong momentum period, though the 10b5-1 plan indicates this was a predetermined execution rather than a discretionary decision. The company remains unprofitable with net income of $-17,465,000.00 against revenue of $48,578,000.00 in the latest quarter, providing a contrasting backdrop to the stock's recent price strength.

2026-05-15 10b5-1 Plan
medium
Chief Technology Officer
180,750 shares
$5,997,751
@ $33.18
Significance 5

OUST CTO Frichtl Mark sells 180,750 shares across 12 transactions for $6.0M via pre-arranged 10b5-1 plan, retaining 628,638 shares post-trade.

Frichtl Mark, Chief Technology Officer at Ouster, Inc. (OUST), executed 12 separate sales totaling 180,750 shares for $5,997,751.39 under a pre-arranged 10b5-1 trading plan, meaning the transactions were scheduled in advance and are not discretionary. The sales occurred across three days (2026-05-13 through 2026-05-15) at prices ranging from $2.13 to $36.00, and the stock has seen substantial recent appreciation — up +42.6% over 30 days and +85.7% over 90 days — providing favorable price context at the time of execution, though timing is not a property of a scheduled 10b5-1 plan. Frichtl retains 628,638 shares post-transaction, representing a meaningful ongoing economic interest in the company. Ouster remains unprofitable with net income of $-17,465,000.00 on quarterly revenue of $48,578,000.00, though annual revenue growth of +52.5% reflects strong top-line momentum.

2026-05-12
high
1,658 shares
$41,831
@ $25.23
Significance 6

Director Boulet purchases 1,658 shares of Ouster amid 30% rally and unprofitable fundamentals; mixed prior timing at this ticker.

Virginia Boulet, a director of Ouster, Inc., acquired 1,658 shares across two open-market transactions, representing a meaningful addition to her stake in the company. This marks the 12th and 13th open-market purchases Boulet has made in the 36-month filing window, reflecting a consistent pattern of accumulation with no offsetting sales. The timing of this purchase is noteworthy: the stock has rallied significantly over recent months and is still trading well below its 52-week high, while the company remains unprofitable on an annual basis despite strong revenue growth. Examining Boulet's prior four purchases at Ouster with measurable outcomes reveals mixed timing results—two of those prior buys were followed by stock gains, while two saw subsequent declines—suggesting neither a clear pattern of well-timed buying into weakness nor consistent poor judgment. The director's continued buying activity in an unprofitable but rapidly growing company, even as the stock has recovered from earlier lows, warrants attention to see whether her pattern of mixed near-term timing improves or whether this represents accumulation ahead of a broader market move.

2026-05-06 10b5-1 Plan
medium
Chief Technology Officer
34,600 shares
$1,040,690
@ $30.08
Significance 4

Ouster CTO exercises stock options and immediately sells entire position, netting $1M gain over two days.

Mark Frichtl, Ouster's Chief Technology Officer, exercised stock options on two consecutive business days and sold the entire 34,600-share position immediately at prices ranging from $30.00 to $30.13 per share, realizing approximately $1M in gross proceeds. This is a textbook same-day or next-day exercise-and-sell pattern, which typically reflects option expiration deadlines or planned liquidity rather than conviction about the company. The stock currently trades well below its 52-week high despite having gained significantly over the past three months, creating favorable conditions for an executive to exercise and exit. Notably, Frichtl's five prior open-market sales at Ouster were all poorly timed—the stock rose after every exit, suggesting this insider has not successfully predicted downturns at this company. The company remains unprofitable despite strong revenue growth, which may explain why the CTO chose to liquidate his option gains rather than hold the underlying shares. This transaction leaves Frichtl's overall stake unchanged at approximately 712,697 shares, indicating the exercise-and-sell was purely a liquidity event, not a reposition.

April 2026
2026-04-21 10b5-1 Plan
low
Chief Technology Officer
120,000 shares
$3,308,667
@ $27.57
Significance 3

CTO Mark Frichtl sold 120,000 OUST shares for $3.3M (4 sales at $26.08–$29.02) via 10b5-1 plan.

Mark Frichtl, Chief Technology Officer at Ouster, Inc., executed 4 separate sales totaling 120,000 shares for $3,308,667.00 across April 20–21, 2026, at prices ranging from $26.08 to $29.02. This transaction is part of a pre-arranged 10b5-1 trading plan, meaning the sales were scheduled and automatic rather than discretionary decisions. The sale reduced his holdings from 832,297 shares to 712,297 shares, a reduction of 120,000 shares (14.4% of pre-transaction holdings). Because the trade is plan-driven, no timing-based characterization or motivation inference is appropriate; investors should view this as a contractually scheduled liquidation with no signal regarding Frichtl's current assessment of company prospects.

2026-04-17 10b5-1 Plan
medium
Chief Technology Officer
30,000 shares
$754,395
@ $25.15
Significance 5

Ourst CTO Mark Frichtl sells 30,000 shares at $25.15; stock now $24.26, down 34.6% from 52-week high.

Mark Frichtl, Chief Technology Officer of Ouster, sold 30,000 shares (a 4.0% reduction of holdings) at $25.15 on 2026-04-17, generating $754,395.00. At current price of $24.26, the stock is -34.6% from its 52-week high of $37.08, though it has recovered +17.0% over the past 30 days. Frichtl's prior sells at Ouster (2026-04-15, 2026-04-14, 2026-03-25 outcomes not yet measurable, plus a 2025-09-12 sale) are clustered in recent weeks, suggesting repeated liquidation activity. The company is unprofitable (net income $-21.7M) despite 52.5% annual revenue growth, with market cap of $1.5B; this transaction occurs in an environment where the stock has recovered significantly from recent lows but remains well below its 52-week peak. The pattern of multiple sales in quick succession warrants attention to management confidence levels relative to near-term business trajectory.

2026-04-15 10b5-1 Plan
medium
Chief Technology Officer
60,000 shares
$1,390,248
@ $23.17
Significance 5

CTO Mark Frichtl sells 60,000 OUST shares in 2 transactions for $1.4M at $22.76–$24.00 (blended $23.17); now holds 712.3K shares post-transaction.

Mark Frichtl, Chief Technology Officer of Ouster, executed two separate sales totaling 60,000 shares for $1,390,248.00 between April 14–15, 2026, reducing his holdings by 7.8% to 712.3K shares. The sales occurred at prices ($22.76 and $24.00, blended $23.17) near or slightly below the current price of $24.44, which sits 34.1% below the 52-week high but up 14.7% over the past 30 days. Frichtl's prior selling activity at OUST has been consistently well-timed: a September 2025 sale achieved a -7.3% 90-day return (the stock declined after the sale), and his cross-ticker record shows a 100% well-timed rate on his two prior sells with average 90-day return of -7.3%. The company is unprofitable with $-21.7M net income on $39.5M quarterly revenue, though it is growing revenue at +52.5% annually, creating mixed fundamental signals during a period of recovery in the stock price.

March 2026
2026-03-27 10b5-1 Plan
medium
Chief Technology Officer
40,000 shares
$837,576
@ $20.94
Significance 5

CTO Mark Frichtl sells 40,000 OUST shares at $20.94; stock down 52.4% from 52-week high, company unprofitable.

Mark Frichtl, Chief Technology Officer, sold 40,000 shares (40.0K shares) on 2026-03-25 at $20.94, reducing holdings by 5.9% to 636,882 shares (636.9K shares). The sale occurs against a backdrop of significant stock decline: OUST is trading at $17.66, down 52.4% from its 52-week high of $37.08 and down 10.8% in the past 30 days alone. The company remains unprofitable with a net income of $-21,733,000.00 (-$21.7M) in the most recent full fiscal year, though revenue growth of 52.5% annually shows business expansion. At the same ticker, Frichtl's prior sell in September 2025 was followed by a 7.3% decline at the 90-day mark, marking his only well-timed sale at OUST; however, his four prior buys at this ticker have delivered mixed results, with a 90-day win rate of 1 of 4 trades. The current sale in a deteriorating price environment warrants investor attention to whether the CTO's near-term view on execution or valuation has shifted.

2026-03-09
medium
6,500 shares
$136,175
@ $20.95
Significance 4

Director Boulet buys 6,500 OUST shares at $20.95; stock down -44.6% from 52-week high.

Director Virginia Boulet purchased 6,500 shares of Ouster at $20.95 on 2026-03-06, increasing her holdings from 221,842 to 228,342 shares. The stock is currently trading 44.6% below its 52-week high of $37.08 and has declined 18.8% over the past 90 days, despite a recent 5.8% 30-day rebound. Examining Boulet's prior transaction history at OUST shows mixed results: of 3 prior buys with measurable outcomes, only 1 was followed by a positive 90-day return, and her cross-ticker track record shows a 33.33% 90-day win rate with an average 90-day return of -13.1%. The company remains unprofitable with net income of $-21.7M in the latest quarter, though revenue growth has been strong at 52.5% year-over-year. This purchase occurs against a backdrop of substantial valuation decline and insider timing that has historically underperformed at this ticker.

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