Pilot reported a near midair collision with a cessna while holding over the sacramento VOR.

Attributes
ACN	1632265
Time
Date	201903
Local Time Of Day	1201-1800
Place
Locale Reference	NCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	None
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Person 1
Function	Instructor Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Vertical 300

Narrative:

We were in a hold over sac VOR at about 3;000 ft. With flight following from north cal. Another aircraft (ce-172?) came within 300 ft. Vertical separation (according to my stratus 3 and foreflight display on ipad). The pilot of the other aircraft involved in this encounter (ce-172?) also reported to north cal that his foreflight warned of being close to our aircraft. That day there were a lot of aircraft in the area (according to stratus 3 and foreflight display).

Original NASA ASRS Text

Title: Pilot reported a NMAC with a Cessna while holding over the Sacramento VOR.

Narrative: We were in a hold over SAC VOR at about 3;000 ft. with flight following from North Cal. Another aircraft (CE-172?) came within 300 ft. vertical separation (according to my Stratus 3 and ForeFlight display on iPad). The pilot of the other aircraft involved in this encounter (CE-172?) also reported to North Cal that his ForeFlight warned of being close to our aircraft. That day there were a lot of aircraft in the area (according to Stratus 3 and Foreflight display).

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.