Whale Rock Capital Management LLC: MKS INC. (MKSI): Quarterly 13F Position History
As of Q2 2026, Whale Rock Capital Management LLC reported 1,271,373 shares of MKS INC. (MKSI), worth $565.5M and representing 4.5% of its 13F equity book. Quarter-over-quarter share count change: 35,351 (-2.7%) . The position first appeared in Q1 2026 and has been disclosed across 2 13F-HR filings in Pactolio's tracked window.
- 1,271,373Shares Held (Latest Filing)
- $565.5MReported Market Value (Latest Filing)
- 4.5%Portfolio Weight (% of 13F Equity Book)
- 35,351Quarter-over-Quarter Share Change
- +$265.2MQuarter-over-Quarter Value Change
- 1,306,724Peak Reported Shares (Historical)
Recent initiation: Whale Rock Capital Management LLC first reported MKSI on the Q1 2026 filing, so fewer than three quarters of history are available.
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 2 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,271,373 | 35,351 | -2.7% | $565.5M | 4.5% | $444.8 |
| Q1 2026 | 1,306,724 | – | – | $300.3M | 3.9% | $229.8 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares, a quarter-end mark rather than the manager's cost basis. See the full methodology document for the normalization rules.
When did Whale Rock Capital Management LLC first disclose a MKSI position in 13F-HR filings?
Whale Rock Capital Management LLC first reported MKS INC. (MKSI) on its 13F-HR filing for the period ending 2026-03-31 (Q1 2026). The position has appeared on 2 reported quarters within Pactolio's tracked window.
What was Whale Rock Capital Management LLC's most recent quarter-over-quarter share-count change in MKSI?
Between Q1 2026 and Q2 2026, Whale Rock Capital Management LLC reduced its MKSI position by 35,351 shares (-2.7%), leaving 1,271,373 shares at a market value of $565.5M.
Does the implied price-per-share represent Whale Rock Capital Management LLC's cost basis in MKSI?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.