Yoon Michael Chung

Insider

First SEC filing: April 23, 2018 · Latest: April 23, 2018

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.

Insider at

PH selling Nov. 17, 2017

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 64 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

64 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
April 20, 2018	PH	A	5,583	—	—	22,048 Direct	+33.91%	Acquired	(price as of 2026-08-20)
Nov. 17, 2017	PH	S	3,950	$182.15	$719,492	16,465 Direct	-19.35%	Disposed	459.6% (price as of 2026-08-20)
Nov. 17, 2017	PH	M	7,850	—	—	7,850 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 17, 2017	PH	S	2,485	$182.00	$452,270	20,415 Direct	-10.85%	Disposed	460.0% (price as of 2026-08-20)
Nov. 17, 2017	PH	F	5,365	$182.00	$976,430	22,900 Direct	-18.98%	Disposed	460.0% (price as of 2026-08-20)
Nov. 17, 2017	PH	M	7,850	$69.10	$542,435	28,265 Direct	+38.45%	Acquired	1375.0% (price as of 2026-08-20)
Aug. 16, 2017	PH	A	7,840	—	—	7,840 Direct	—	Acquired	(price as of 2026-08-20)
April 21, 2017	PH	F	1,399	$157.07	$219,741	20,415 Direct	-6.41%	Disposed	548.9% (price as of 2026-08-20)
April 21, 2017	PH	A	4,255	—	—	21,814 Direct	+24.23%	Acquired	(price as of 2026-08-20)
April 20, 2017	PH	F	1,723	$176.18	$303,558	20,325 Direct	-7.81%	Disposed	478.5% (price as of 2026-08-20)
March 2, 2017	PH	M	5,779	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 2, 2017	PH	S	657	$158.40	$104,069	17,559 Direct	-3.61%	Disposed	543.5% (price as of 2026-08-20)
March 2, 2017	PH	F	5,122	$158.35	$811,069	18,216 Direct	-21.95%	Disposed	543.7% (price as of 2026-08-20)
March 2, 2017	PH	M	5,779	$131.69	$761,037	23,338 Direct	+32.91%	Acquired	674.0% (price as of 2026-08-20)
Nov. 10, 2016	PH	M	7,107	$100.01	$710,771	24,666 Direct	+40.47%	Acquired	919.1% (price as of 2026-08-20)
Nov. 10, 2016	PH	M	11,140	$62.35	$694,579	35,806 Direct	+45.16%	Acquired	1534.7% (price as of 2026-08-20)
Nov. 10, 2016	PH	F	13,819	$136.70	$1,889,057	21,987 Direct	-38.59%	Disposed	645.6% (price as of 2026-08-20)
Nov. 10, 2016	PH	S	4,428	$136.66	$605,130	17,559 Direct	-20.14%	Disposed	645.8% (price as of 2026-08-20)
Nov. 10, 2016	PH	M	7,107	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 10, 2016	PH	M	11,140	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 17, 2016	PH	A	9,910	—	—	9,910 Direct	—	Acquired	(price as of 2026-08-20)
April 22, 2016	PH	F	975	$113.90	$111,052	17,559 Direct	-5.26%	Disposed	794.9% (price as of 2026-08-20)
April 22, 2016	PH	A	2,967	—	—	18,534 Direct	+19.06%	Acquired	(price as of 2026-08-20)
Aug. 12, 2015	PH	A	8,680	—	—	8,680 Direct	—	Acquired	(price as of 2026-08-20)
April 30, 2015	PH	F	1,072	$119.06	$127,632	15,567 Direct	-6.44%	Disposed	756.1% (price as of 2026-08-20)
April 30, 2015	PH	A	3,260	—	—	16,639 Direct	+24.37%	Acquired	(price as of 2026-08-20)
Nov. 26, 2014	PH	A	5,779	—	—	5,779 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 26, 2014	PH	M	11,700	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 26, 2014	PH	S	3,888	$132.28	$514,305	13,379 Direct	-22.52%	Disposed	670.5% (price as of 2026-08-20)
Nov. 26, 2014	PH	F	8,589	$132.30	$1,136,325	17,267 Direct	-33.22%	Disposed	670.4% (price as of 2026-08-20)
Nov. 26, 2014	PH	M	11,700	$65.34	$764,478	25,856 Direct	+82.65%	Acquired	1459.9% (price as of 2026-08-20)
Aug. 17, 2014	PH	F	2,228	$113.06	$251,898	14,156 Direct	-13.60%	Disposed	801.5% (price as of 2026-08-20)
Aug. 13, 2014	PH	A	9,040	—	—	9,040 Direct	—	Acquired	(price as of 2026-08-20)
May 5, 2014	PH	S	3,100	$124.89	$387,159	16,384 Direct	-15.91%	Disposed	716.1% (price as of 2026-08-20)
April 30, 2014	PH	F	1,519	$126.16	$191,637	19,484 Direct	-7.23%	Disposed	707.9% (price as of 2026-08-20)
April 30, 2014	PH	A	4,619	—	—	21,003 Direct	+28.19%	Acquired	(price as of 2026-08-20)
Dec. 6, 2013	PH	M	8,235	—	—	0 Direct	—	Acquired	(price as of 2026-08-20)
Dec. 6, 2013	PH	S	2,132	$120.18	$256,224	16,384 Direct	-11.51%	Disposed	748.1% (price as of 2026-08-20)
Dec. 6, 2013	PH	F	6,103	$120.11	$733,031	18,516 Direct	-24.79%	Disposed	748.6% (price as of 2026-08-20)
Dec. 6, 2013	PH	M	8,235	$60.93	$501,759	24,619 Direct	+50.26%	Acquired	1572.8% (price as of 2026-08-20)
Sept. 12, 2013	PH	S	4,800	$104.43	$501,264	16,384 Direct	-22.66%	Disposed	876.0% (price as of 2026-08-20)
Aug. 14, 2013	PH	A	12,000	—	—	12,000 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 11, 2013	PH	F	1,344	$103.66	$139,319	21,184 Direct	-5.97%	Disposed	883.3% (price as of 2026-08-20)
May 17, 2013	PH	A	7,107	—	—	7,107 Direct	—	Acquired	(price as of 2026-08-20)
May 17, 2013	PH	M	14,295	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 17, 2013	PH	F	10,407	$99.49	$1,035,392	22,528 Direct	-31.60%	Disposed	924.5% (price as of 2026-08-20)
May 17, 2013	PH	M	14,295	$49.46	$707,031	32,935 Direct	+76.69%	Acquired	1960.7% (price as of 2026-08-20)
April 17, 2013	PH	F	1,615	$87.01	$140,521	18,640 Direct	-7.97%	Disposed	1071.4% (price as of 2026-08-20)
April 17, 2013	PH	A	4,912	—	—	20,255 Direct	+32.01%	Acquired	(price as of 2026-08-20)
Jan. 28, 2013	PH	M	8,100	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Jan. 28, 2013	PH	S	2,536	$93.78	$237,826	15,343 Direct	-14.18%	Disposed	986.8% (price as of 2026-08-20)
Jan. 28, 2013	PH	F	5,564	$93.78	$521,792	17,879 Direct	-23.73%	Disposed	986.8% (price as of 2026-08-20)
Jan. 28, 2013	PH	M	8,100	$49.75	$402,975	23,443 Direct	+52.79%	Acquired	1948.7% (price as of 2026-08-20)
Aug. 15, 2012	PH	A	9,750	—	—	9,750 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 15, 2012	PH	F	3,916	$81.55	$319,350	15,343 Direct	-20.33%	Disposed	1149.8% (price as of 2026-08-20)
Aug. 15, 2012	PH	A	10,924	—	—	19,259 Direct	+131.06%	Acquired	(price as of 2026-08-20)
Aug. 12, 2012	PH	F	222	$82.70	$18,359	8,335 Direct	-2.59%	Disposed	1132.5% (price as of 2026-08-20)
Aug. 17, 2011	PH	A	7,850	—	—	7,850 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 17, 2011	PH	A	4,722	—	—	8,557 Direct	+123.13%	Acquired	(price as of 2026-08-20)
Aug. 13, 2011	PH	F	166	$68.44	$11,361	3,835 Direct	-4.15%	Disposed	1389.2% (price as of 2026-08-20)
Dec. 10, 2010	PH	M	7,800	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Dec. 10, 2010	PH	S	400	$85.43	$34,172	4,001 Direct	-9.09%	Disposed	1093.1% (price as of 2026-08-20)
Dec. 10, 2010	PH	S	882	$85.42	$75,340	4,401 Direct	-16.70%	Disposed	1093.2% (price as of 2026-08-20)
Dec. 10, 2010	PH	S	1,007	$85.41	$86,008	5,283 Direct	-16.01%	Disposed	1093.3% (price as of 2026-08-20)
Dec. 10, 2010	PH	F	1,514	$85.41	$129,311	6,290 Direct	-19.40%	Disposed	1093.3% (price as of 2026-08-20)
Dec. 10, 2010	PH	D	3,997	$85.41	$341,384	7,804 Direct	-33.87%	Disposed	1093.3% (price as of 2026-08-20)
Dec. 10, 2010	PH	M	7,800	$43.77	$341,406	11,801 Direct	+194.95%	Acquired	2228.6% (price as of 2026-08-20)
Nov. 18, 2010	PH	M	6,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 18, 2010	PH	S	1,500	$80.40	$120,600	4,001 Direct	-27.27%	Disposed	1167.7% (price as of 2026-08-20)
Nov. 18, 2010	PH	S	586	$80.43	$47,132	5,501 Direct	-9.63%	Disposed	1167.2% (price as of 2026-08-20)
Nov. 18, 2010	PH	F	3,914	$80.43	$314,803	6,087 Direct	-39.14%	Disposed	1167.2% (price as of 2026-08-20)
Nov. 18, 2010	PH	M	6,000	$36.26	$217,560	10,001 Direct	+149.96%	Acquired	2710.9% (price as of 2026-08-20)
Aug. 11, 2010	PH	A	11,140	—	—	11,140 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 11, 2010	PH	A	2,832	—	—	4,001 Direct	+242.26%	Acquired	(price as of 2026-08-20)
Aug. 12, 2009	PH	A	14,295	—	—	14,295 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 12, 2009	PH	A	717	—	—	1,169 Direct	+158.63%	Acquired	(price as of 2026-08-20)
Aug. 13, 2008	PH	A	11,700	—	—	11,700 Direct	—	Acquired	(price as of 2026-08-20)
Aug. 13, 2008	PH	A	448	—	—	452 Direct	+11200.00%	Acquired	(price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
Nov. 17, 2017	PH	Common Stock	Common Stock (7,850)	$69.10	Aug. 16, 2021	7,850	Acquired
Aug. 16, 2017	PH	Stock Appreciation Right	Common Stock (7,840)	$158.79	Aug. 15, 2027	7,840	Acquired
March 2, 2017	PH	Stock Appreciation Right	Common Stock (5,779)	$131.69	Aug. 12, 2018	5,779	Disposed
Nov. 10, 2016	PH	Stock Appreciation Right	Common Stock (7,107)	$100.01	Aug. 11, 2019	7,107	Disposed
Nov. 10, 2016	PH	Stock Appreciation Right	Common Stock (11,140)	$62.35	Aug. 10, 2020	11,140	Disposed
Aug. 17, 2016	PH	Stock Appreciation Right	Common Stock (9,910)	$124.36	Aug. 16, 2026	9,910	Acquired
Aug. 12, 2015	PH	Stock Appreciation Right	Common Stock (8,680)	$113.23	Aug. 11, 2025	8,680	Acquired
Nov. 26, 2014	PH	Stock Appreciation Right	Common Stock (5,779)	$131.69	Aug. 12, 2018	5,779	Acquired
Nov. 26, 2014	PH	Option to Buy with Tandem Stock Appreciation Right	Common Stock (11,700)	$65.34	Aug. 12, 2018	11,700	Disposed
Aug. 13, 2014	PH	Stock Appreciation Right	Common Stock (9,040)	$113.19	Aug. 12, 2024	9,040	Acquired
Dec. 6, 2013	PH	Stock Appreciation Right	Common Stock (8,235)	$60.93	Aug. 14, 2017	8,235	Acquired
Aug. 14, 2013	PH	Stock Appreciation Right	Common Stock (12,000)	$106.18	Aug. 13, 2023	12,000	Acquired
May 17, 2013	PH	Stock Appreciation Right	Common Stock (7,107)	$100.01	Aug. 11, 2019	7,107	Acquired
May 17, 2013	PH	Option to Buy with Tandem Stock Appreciation Right	Common Stock (14,295)	$49.46	Aug. 11, 2019	14,295	Disposed
Jan. 28, 2013	PH	Stock Appreciation Right	Common Stock (8,100)	$49.75	Aug. 15, 2016	8,100	Disposed
Aug. 15, 2012	PH	Stock Appreciation Right	Common Stock (9,750)	$81.86	Aug. 14, 2022	9,750	Acquired
Aug. 17, 2011	PH	Stock Appreciation Right	Common Stock (7,850)	$69.10	Aug. 16, 2021	7,850	Acquired
Dec. 10, 2010	PH	Stock Appreciation Right	Common Stock (7,800)	$43.77	Aug. 9, 2015	7,800	Disposed
Nov. 18, 2010	PH	Option to Buy	Common Stock (6,000)	$36.26	Aug. 10, 2014	6,000	Disposed
Aug. 11, 2010	PH	Stock Appreciation Right	Common Stock (11,140)	$62.35	Aug. 10, 2020	11,140	Acquired
Aug. 12, 2009	PH	Option to buy with tandem stock appreciation right	Common Stock (14,295)	$49.46	Aug. 11, 2019	14,295	Acquired
Aug. 13, 2008	PH	Option to buy with tandem stock appreciation right	Common Stock (11,700)	$65.34	Aug. 12, 2018	11,700	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 6 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
March 11, 2008	PH	Common Stock	4,337	Indirect
March 11, 2008	PH	Common Stock	4	Direct
March 11, 2008	PH	Option to Buy→ Common Stock (6,000)	6,000	Direct
March 11, 2008	PH	Stock Appreciation Right→ Common Stock (7,800)	7,800	Direct
March 11, 2008	PH	Stock Appreciation Right→ Common Stock (8,100)	8,100	Direct
March 11, 2008	PH	Stock Appreciation Right→ Common Stock (8,235)	8,235	Direct