Polaris Venture Management Co IV LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Reported portfolio value by quarter (12 quarters reported)

$152M $53.1M

Q4 13 Q3 14 Q2 15 Q1 16 Q3 16

$151M in Q4 2013 → $62.4M now. Hover for any quarter.

Holdings

As reported for the quarter ended September 30, 2016. Activity is the change in share count since the prior quarter's filing.

Holding	% of portfolio	Activity	Shares	Value
AP Acceleron Pharma Inc	85.9%	Unchanged	1,480,060	$53.6M
Alimera Sciences Inc	7.5%	Unchanged	3,148,355	$4.69M
Pulmatrix Inc	4.2%	Unchanged	1,591,862	$2.63M
CP Cerulean Pharma Inc	2.4%	Unchanged	1,437,441	$1.51M

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

quarter ended September 30, 2016 · filed February 14, 2017

No position changes this quarter.

quarter ended June 30, 2016 · filed February 14, 2017

No position changes this quarter.

quarter ended March 31, 2016 · filed May 13, 2016

No position changes this quarter.

quarter ended December 31, 2015 · filed February 16, 2016

No position changes this quarter.

quarter ended September 30, 2015 · filed November 10, 2015

Company	Action	Shares changed	Value of change	% of portfolio
AP Acceleron Pharma Inc	Trimmed	−407,259	−$10.1M	64.8%

quarter ended June 30, 2015 · filed August 11, 2015

Company	Action	Shares changed	Value of change	% of portfolio
AP Acceleron Pharma Inc	Trimmed	−509,070	−$16.1M	62.1%
Pulmatrix Inc	New	+1,591,862	+$15.3M	15.9%

quarter ended March 31, 2015 · filed May 14, 2015

Company	Action	Shares changed	Value of change	% of portfolio
AP Acceleron Pharma Inc	Trimmed	−183,902	−$7M	76.0%

quarter ended December 31, 2014 · filed February 17, 2015

Company	Action	Shares changed	Value of change	% of portfolio
AP Acceleron Pharma Inc	Trimmed	−223,354	−$8.7M	79.2%

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