X0306 4 2015-03-11 0 0001320414 SELECT MEDICAL HOLDINGS CORP SEM 0001557543 NORTH TIDE CAPITAL, LLC 500 BOYLSTON STREET SUITE 1860 BOSTON MA 02116 0 0 1 0 0001594882 North Tide Capital Master, LP 500 BOYLSTON STREET SUITE 1860 BOSTON MA 02116 0 0 1 0 0001594068 Laughlin Conan 500 BOYLSTON STREET SUITE 1860 BOSTON MA 02116 0 0 1 0 Common Stock 2015-03-09 4 S 0 8630 13.375 D 13941370 I See Footnotes Common Stock 2015-03-09 4 S 0 327670 13.375 D 13613700 I See Footnotes Common Stock 2015-03-09 4 S 0 2500 13.4 D 13611200 I See Footnotes Common Stock 2015-03-09 4 S 0 22500 13.4 D 13588700 I See Footnotes Common Stock 2015-03-09 4 S 0 560 13.3969 D 13588140 I See Footnotes Common Stock 2015-03-09 4 S 0 5040 13.3969 D 13583100 I See Footnotes Common Stock 2015-03-10 4 S 0 4500 13 D 13578600 I See Footnotes Common Stock 2015-03-10 4 S 0 40500 13 D 13538100 I See Footnotes Common Stock 2015-03-10 4 S 0 8810 12.965 D 13529290 I See Footnotes Common Stock 2015-03-10 4 S 0 79290 12.965 D 13450000 I See Footnotes Shares reported herein represent: as of the close of business on March 9, 2015, (i) 12,294,790 shares held by North Tide Capital Master, LP (the "Master Fund") and (ii) 1,288,310 shares held by held by a managed account (the "Account"); and as of the close of business on March 10, 2015, (i) 12,175,000 shares held by the Master Fund and (ii) 1,275,000 shares held by the Account. North Tide Capital, LLC ("North Tide") serves as investment manager for the Master Fund and the Account. Mr. Laughlin serves as manager of North Tide. Each of the Reporting Persons disclaims beneficial ownership of the shares reported herein except to the extent of its or his pecuniary interest therein, and the filing of this Form 4 shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any such shares for purposes of Section 16(a) of the Securities Exchange Act of 1934 or for any other purpose. Transaction effected by the Master Fund. Transaction effected by the Account. /s/ NORTH TIDE CAPITAL, LLC, by Conan Laughlin, Manager 2015-03-11 /s/ NORTH TIDE CAPITAL MASTER, LP, by North Tide Capital GP, LLC, Conan Laughlin, Manager 2015-03-11 /s/ CONAN LAUGHLIN 2015-03-11