SharkWater Trading  •  Data Centers • Ownership Filings Goldman Sachs Cut Its Nebius Stake by 44 Percent in Two Months October 9, 2026 Bottom Line Up Front Yesterday this desk could not say whether Goldman's Nebius (Nasdaq: NBIS) Schedule 13G/A was a build or a cut. The prior amendment answers it. Amendment No. 1 (event date July 31, 2026) reported 23,111,112.59 Class A shares, 10.5 percent of the class. Amendment No. 2, filed October 7, 2026 (event date September 30, 2026), reports 13,023,110.37 shares, 5.1 percent. That is a drop of about 10.09 million shares, or 43.6 percent of the position (this desk's arithmetic). Why Goldman sold, and for whom, is not in the filing. The Two Filings Side by Side Filing Event date Shares % of class 13G/A No. 1 (0000886982-26-000308) 7/31/2026 23,111,112.59 10.5% 13G/A No. 2 (0000886982-26-000526) 9/30/2026 13,023,110.37 5.1% Source: Schedule 13G/A filings on EDGAR, Goldman Sachs Group and Goldman Sachs & Co. LLC, each reporting identical figures. Amendment No. 1 filing date not read by this desk; only its event date is shown. What It Does and Does Not Say Both filings report shared voting and dispositive power and zero sole power. Goldman files under Rule 13d-1(b), the institutional route. Exhibit 99.3 states the filing excludes shares held by operating units of the group. So this is the reporting entity's aggregate, not necessarily house inventory. A 13G does not separate client assets from the bank's own book, and it does not name a buyer. A drop of this size could be client outflows, hedge unwinds, or a market-making position shrinking. The form cannot tell us which. One note on the math. 10.5 percent implies a class near 220 million shares, and 5.1 percent implies about 255 million. Rounding and a changing share count could explain part of that. This desk did not find the denominators in either filing, so the implied counts are unreconciled. Yesterday we saw a big boat at the dock and could not tell if it was loading or unloading. The earlier log entry shows the hold was nearly twice as full in July. The Bull Case Passive, not conviction. A bank's 13G position moves with client flow. The reduction is not evidence of a negative view. Supply was absorbed. Roughly 10 million shares left one holder, and the filing discloses no forced event behind it. Still above the line. Goldman remains a 5.1 percent reporter, so it has not exited. The Bear Case A large holder cut its stake by 44 percent. Ten million shares is real supply, and it landed alongside the Nave Form 144 for 500,000 shares reported October 5, 2026. The line is one step away. At 5.1 percent, the next reduction could take Goldman below the reporting threshold and out of public view. Price reaction unknown. This desk had no primary price source for NBIS, so whether the market already reflects the sale is NOT VERIFIED. The SharkWater Take I read this as supply, not a verdict. Goldman's 13G tells me flow, and flow is not conviction. What bothers me is the stack: a 44 percent bank cut, a 500,000 share insider plan sale, and Form 4s from the same week. None of it is a thesis alone. Together it says the easy buyers have thinned. I am not taking a position off a passive filing. I want the next 13G event date and a verified NBIS price series before this becomes a trade idea. Tight lines, SharkWater Source: Schedule 13G/A Amendment No. 2, EDGAR accession 0000886982-26-000526, filed October 7, 2026, event date September 30, 2026; Schedule 13G/A Amendment No. 1, accession 0000886982-26-000308, event date July 31, 2026. Percent change is this desk's arithmetic. Educational and informational purposes only. Not personalized investment advice. The author may hold positions in securities discussed. Do your own work.