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Insider · CIK 0001473289

Seifert Thomas J

CIK 0001473289 Name as filed on the most recent filing

Filed as Seifert Thomas J (136)

585 transaction lines · from 136 filings · filed 2016-12-15 to 2026-08-19 The span is the filing dates this catalog holds, not the entity's full filing history. Absence here is not evidence of absence at the SEC.

How this page attributes a trade

A line appears here when the filing that carries it names this CIK as a reporting owner, not only when the parser picked this CIK as the line's primary owner. That is why a joint filing appears on both owners' pages rather than vanishing from the second one. The catalog never merges two CIKs into one person and never splits one CIK into two: identity here is the SEC's own identifier and nothing else.

01

Issuers this insider has filed against

Ordered by last-seen filing date, newest first. Roles are as filed on the Form 4 and are not normalised.

Fault

This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-21 05:23 UTC.

No issuer is recorded

The catalog holds no filing linking this CIK to an issuer.

02

Transactions

Every stored Form 4 line naming this reporting owner, newest transaction date first. Each row links to the filing it came from.

585 transactions · Newest transaction date first, id breaking the tie.

Fault

This container could not be filled from the store. It is showing nothing because a read failed, not because no insider filed: those are different facts and this catalog will not let one stand in for the other. The last ingest the store recorded was 2026-08-21 05:23 UTC.

Transactions filed by this insider
Direction Date Issuer Code Shares Price Value USD Filing
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 100 disposed 314.61 31,461.00 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 200 disposed 312.32 62,464.00 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 300 disposed 309.07 92,721.00 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 3,100 disposed 308.23 955,512.07 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,456 disposed 307.29 754,714.80 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,944 disposed 306.24 901,579.10 Form 4, filing 0001473289-26-000025
2026-08-17 Cloudflare, Inc.
NET 		S, Open-market sale 900 disposed 305.25 274,723.92 Form 4, filing 0001473289-26-000025
2026-08-04 Cloudflare, Inc.
NET 		S, Open-market sale 53,861 disposed 300.28 16,173,445.71 Form 4, filing 0001473289-26-000021
2026-08-04 Cloudflare, Inc.
NET 		S, Open-market sale 1,139 disposed 301.00 342,839.00 Form 4, filing 0001473289-26-000021
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 3,299 disposed 277.68 916,056.09 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,741 disposed 276.63 481,618.05 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,559 disposed 275.79 429,951.31 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,201 disposed 278.76 334,785.60 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 800 disposed 279.91 223,928.72 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 500 disposed 274.60 137,302.00 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 300 disposed 281.29 84,387.99 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 300 disposed 270.50 81,150.99 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 200 disposed 266.19 53,238.00 Form 4, filing 0001473289-26-000018
2026-07-17 Cloudflare, Inc.
NET 		S, Open-market sale 100 disposed 267.76 26,776.00 Form 4, filing 0001473289-26-000018
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 3,167 disposed 233.44 739,308.60 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,633 disposed 234.18 616,599.63 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 900 disposed 228.91 206,020.98 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 900 disposed 227.74 204,963.21 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 685 disposed 230.90 158,164.92 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 600 disposed 235.34 141,202.86 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 600 disposed 232.00 139,201.02 Form 4, filing 0001473289-26-000016
2026-06-17 Cloudflare, Inc.
NET 		S, Open-market sale 515 disposed 229.95 118,426.00 Form 4, filing 0001473289-26-000016
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 3,570 disposed 201.21 718,310.78 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 2,432 disposed 200.20 486,894.91 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 2,000 disposed 202.17 404,333.40 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 928 disposed 199.05 184,721.65 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 400 disposed 197.81 79,123.48 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 300 disposed 195.14 58,541.01 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 270 disposed 203.02 54,814.29 Form 4, filing 0001473289-26-000014
2026-05-18 Cloudflare, Inc.
NET 		S, Open-market sale 100 disposed 193.28 19,328.00 Form 4, filing 0001473289-26-000014
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,725 disposed 200.51 546,390.84 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,076 disposed 195.09 405,000.61 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,724 disposed 196.04 337,968.82 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,475 disposed 199.48 294,229.31 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 1,000 disposed 196.97 196,966.60 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 600 disposed 198.04 118,821.00 Form 4, filing 0001473289-26-000012
2026-04-17 Cloudflare, Inc.
NET 		S, Open-market sale 400 disposed 200.95 80,380.00 Form 4, filing 0001473289-26-000012
2026-03-17 Cloudflare, Inc.
NET 		S, Open-market sale 5,000 disposed 212.57 1,062,831.00 Form 4, filing 0001473289-26-000010
2026-03-17 Cloudflare, Inc.
NET 		S, Open-market sale 3,041 disposed 211.69 643,746.25 Form 4, filing 0001473289-26-000010
2026-03-17 Cloudflare, Inc.
NET 		S, Open-market sale 2,000 disposed 213.23 426,464.60 Form 4, filing 0001473289-26-000010
2026-03-17 Cloudflare, Inc.
NET 		S, Open-market sale 200 disposed 207.68 41,536.00 Form 4, filing 0001473289-26-000010
2026-03-17 Cloudflare, Inc.
NET 		S, Open-market sale 100 disposed 208.64 20,864.00 Form 4, filing 0001473289-26-000010
2026-02-20 Cloudflare, Inc.
NET 		S, Open-market sale 8,279 disposed 177.18 1,466,890.61 Form 4, filing 0001473289-26-000006
2026-02-20 Cloudflare, Inc.
NET 		S, Open-market sale 8,133 disposed 191.13 1,554,444.02 Form 4, filing 0001473289-26-000006
2026-02-20 Cloudflare, Inc.
NET 		S, Open-market sale 4,771 disposed 192.18 916,891.26 Form 4, filing 0001473289-26-000006

This column is intentionally blank

No transaction line is stored for this reporting owner, though the catalog holds filings naming them. That happens when the filings report only holdings or only positions the store does not carry, and when a parse failed; each filing page states its own parse status.

Search the catalog
Codes on this page
S, Open-market sale
Open-market sale

Every value is as reported on the Form 4. A price the filing did not report is marked Not reported and no value is computed from it. Codes outside the open market, drawn in grey behind a dashed rule, are compensation and administrative machinery rather than a decision to trade at the prevailing price.

What this insider's stored lines contain

Exact counts over every stored line for this entity. This is a statement of composition, not a filter: the only filter this page offers is the open-market one above, because that is the only one an index serves today.

  • Open-market purchase 0
  • Open-market sale 585
  • Option exercise 0
  • Grant or award 0
  • Tax withholding 0
  • Disposition to the issuer 0
  • In-the-money option exercise 0

How to cite this page

ebomi catalog. SEIFERT THOMAS J, insider transactions. Retrieved 2026-08-22 from https://ebomi.com/insider/0001473289

Balogh, A. Insider trading. Scientific Data 10, 237 (2023) doi:10.1038/s41597-023-02147-6

This page as JSON The JSON twin is shaped by the same read model as this page, so the two cannot disagree. Its envelope carries the canonical URL, the retrieval time, the coverage claim, and the licence statement.