InsiderSource
FSLR

FIRST SOLAR, INC.

SEC CIK 1274494
$264.36 +20.9% · 90 days
90-day buys
$0
0 open-market
90-day sells
$6.05M
39 open-market
Net insider flow
−$6.05M
Net selling
Filings shown
104
Most recent
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At a glance

Over the last 90 days, insiders at FSLR have sold a net $6.05M of stock (0 open-market buys vs 39 sells).

Largest recent trade: Widmar Mark R sold $10.03M of FSLR, trimming their stake 31%.

Most active filer: Widmar Mark R, with 104 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for FSLR, newest first
View on SEC EDGAR ↗
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.4%

Widmar Mark R sold $312K of FSLR, trimming their stake 1%.

−$312K
1,300 sh @ $240
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.4%

Widmar Mark R sold $345.3K of FSLR, trimming their stake 1%.

−$345.3K
1,500 sh @ $230
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.0%

Widmar Mark R sold $237.5K of FSLR, trimming their stake 1%.

−$237.5K
1,026 sh @ $232
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −2.2%

Widmar Mark R sold $526K of FSLR, trimming their stake 2%.

−$526K
2,262 sh @ $233
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.9%

Widmar Mark R sold $438.4K of FSLR, trimming their stake 2%.

−$438.4K
1,877 sh @ $234
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FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.5%

Widmar Mark R sold $351.8K of FSLR, trimming their stake 2%.

−$351.8K
1,498 sh @ $235
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.4%

Widmar Mark R sold $321.2K of FSLR, trimming their stake 1%.

−$321.2K
1,363 sh @ $236
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 13, 2026 ΔOwn −0.4%

Widmar Mark R sold $94.6K of FSLR.

−$94.6K
400 sh @ $237
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed May 5, 2026 ΔOwn −1.4%

Widmar Mark R sold $329.1K of FSLR, trimming their stake 1%.

−$329.1K
1,526 sh @ $216
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 17, 2026 ΔOwn −1.8%

Widmar Mark R sold $388.9K of FSLR, trimming their stake 2%.

−$388.9K
1,937 sh @ $201
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 10, 2026 ΔOwn −2.0%

Widmar Mark R sold $394.4K of FSLR, trimming their stake 2%.

−$394.4K
2,072 sh @ $190
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 10, 2026 ΔOwn −0.5%

Widmar Mark R sold $91.4K of FSLR.

−$91.4K
480 sh @ $190
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 10, 2026 ΔOwn −1.2%

Widmar Mark R sold $244K of FSLR, trimming their stake 1%.

−$244K
1,282 sh @ $190
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 10, 2026 ΔOwn −1.7%

Widmar Mark R sold $324.2K of FSLR, trimming their stake 2%.

−$324.2K
1,703 sh @ $190
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Mar 3, 2026 ΔOwn −7.8%

Widmar Mark R sold $1.52M of FSLR, trimming their stake 8%.

−$1.52M
7,738 sh @ $196
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.1%

Widmar Mark R sold $8.7K of FSLR.

−$8.7K
47 sh @ $185
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $1.7K of FSLR.

−$1.7K
9 sh @ $186
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.2%

Widmar Mark R sold $28.9K of FSLR.

−$28.9K
152 sh @ $190
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.2%

Widmar Mark R sold $36.7K of FSLR.

−$36.7K
192 sh @ $191
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $5.8K of FSLR.

−$5.8K
30 sh @ $192
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $6.4K of FSLR.

−$6.4K
33 sh @ $193
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $4.7K of FSLR.

−$4.7K
24 sh @ $194
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.2%

Widmar Mark R sold $34.9K of FSLR.

−$34.9K
179 sh @ $195
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $7.1K of FSLR.

−$7.1K
36 sh @ $197
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.1%

Widmar Mark R sold $16.4K of FSLR.

−$16.4K
83 sh @ $198
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.1%

Widmar Mark R sold $11.5K of FSLR.

−$11.5K
58 sh @ $199
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.2%

Widmar Mark R sold $32K of FSLR.

−$32K
160 sh @ $200
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025

Widmar Mark R sold $5.6K of FSLR.

−$5.6K
28 sh @ $201
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.2%

Widmar Mark R sold $30.7K of FSLR.

−$30.7K
152 sh @ $202
FSLR
FIRST SOLAR, INC.
Sell Widmar Mark R · Director, Chief Executive Officer · Open-market sale · filed Aug 18, 2025 ΔOwn −0.6%

Widmar Mark R sold $103.4K of FSLR, trimming their stake 1%.

−$103.4K
509 sh @ $203
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About FSLR insider activity

This page tracks every recent Form 4 filed for FIRST SOLAR, INC. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is FSLR insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for FIRST SOLAR, INC. usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.