Alexander Blum
CIK 2042056 · SVP, Chief Operating Officer · last filed 2026-09-01
Alexander Blum is a SVP, Chief Operating Officer who has filed 28 SEC Form 4 insider transactions across 1 company since 2024. The most recent filing shows the insider sold $1.9M of U on Sep 1, 2026. Across all open-market trades the lifetime net is −$10.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $26.7M across reported positions. 29 SEC filings were submitted jointly with Unity Software Inc.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
U price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
30 3RD STREET
SAN FRANCISCO, CA 94103
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| U | SVP, Chief Operating Officer | 661,855 | $40.40 | $26.74M | -$10.09M | 14 | 2026-09-01 |
Recent Filings
28 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-01 | U | Sell (S) | −43,556 | -$1.90M | EDGAR |
| 2026-08-28 | U | Notice (144) | −43,556 | -$1.90M | EDGAR |
| 2026-08-27 | U | Sell (S) | −22,559 | -$1.02M | EDGAR |
| 2026-08-27 | U | Notice (144) | −1,964 | -$88.0K | EDGAR |
| 2026-08-25 | U | Notice (144) | −20,595 | -$933.1K | EDGAR |
| 2026-05-28 | U | Sell (S) | −21,108 | -$574.1K | EDGAR |
| 2026-05-28 | U | Notice (144) | −2,099 | -$57.5K | EDGAR |
| 2026-05-26 | U | Notice (144) | −19,009 | -$516.7K | EDGAR |
| 2026-03-04 | U | Grant (A) | +200,653 | $0 | EDGAR |
| 2026-02-27 | U | Sell (S) | −12,705 | -$231.3K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.