Matthew D Preston

Insider

First SEC filing: Nov. 20, 2019 · Latest: Nov. 20, 2019

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.
Compensation Executive pay disclosed in company proxy statements.

Insider at

IPI selling May 25, 2022

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 24 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

24 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
July 25, 2025	IPI	M	424	—	—	60,133 Direct	+0.71%	Acquired	(price as of 2026-08-20)
July 25, 2025	IPI	F	157	$35.89	$5,635	59,976 Direct	-0.26%	Disposed	6.9% (price as of 2026-08-20)
July 25, 2025	IPI	M	424	—	—	2,973 Direct	-12.48%	Disposed	(price as of 2026-08-20)
May 5, 2025	IPI	F	996	$32.57	$32,440	59,709 Direct	-1.64%	Disposed	17.8% (price as of 2026-08-20)
April 25, 2025	IPI	F	830	$33.25	$27,598	60,705 Direct	-1.35%	Disposed	15.4% (price as of 2026-08-20)
April 10, 2025	IPI	F	1,366	$26.10	$35,653	61,535 Direct	-2.17%	Disposed	47.0% (price as of 2026-08-20)
March 17, 2025	IPI	A	8,567	—	—	62,901 Direct	+15.77%	Acquired	(price as of 2026-08-20)
March 17, 2025	IPI	A	3,397	—	—	3,397 Direct	—	Acquired	(price as of 2026-08-20)
March 17, 2025	IPI	F	1,344	$29.18	$39,218	54,334 Direct	-2.41%	Disposed	31.5% (price as of 2026-08-20)
March 15, 2025	IPI	F	2,270	$26.57	$60,314	55,678 Direct	-3.92%	Disposed	44.4% (price as of 2026-08-20)
April 10, 2024	IPI	A	14,137	—	—	57,948 Direct	+32.27%	Acquired	(price as of 2026-08-20)
March 17, 2024	IPI	F	1,590	$19.37	$30,798	43,811 Direct	-3.50%	Disposed	98.1% (price as of 2026-08-20)
March 15, 2024	IPI	A	21,560	—	—	45,401 Direct	+90.43%	Acquired	(price as of 2026-08-20)
March 11, 2024	IPI	F	180	$20.25	$3,645	23,841 Direct	-0.75%	Disposed	89.5% (price as of 2026-08-20)
Dec. 15, 2023	IPI	F	387	$23.33	$9,029	24,021 Direct	-1.59%	Disposed	64.5% (price as of 2026-08-20)
March 17, 2023	IPI	A	15,757	—	—	24,408 Direct	+182.14%	Acquired	(price as of 2026-08-20)
March 17, 2023	IPI	F	712	$26.05	$18,548	8,651 Direct	-7.60%	Disposed	47.3% (price as of 2026-08-20)
March 11, 2023	IPI	F	179	$29.03	$5,196	9,363 Direct	-1.88%	Disposed	32.2% (price as of 2026-08-20)
Dec. 15, 2022	IPI	F	387	$30.79	$11,916	9,542 Direct	-3.90%	Disposed	24.6% (price as of 2026-08-20)
May 25, 2022	IPI	M	1,018	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 25, 2022	IPI	S	6,136	$64.74	$397,245	9,929 Direct	-38.19%	Disposed	-40.7% (price as of 2026-08-20)
May 25, 2022	IPI	M	1,018	$10.30	$10,485	16,065 Direct	+6.77%	Acquired	272.5% (price as of 2026-08-20)
March 17, 2022	IPI	A	6,222	—	—	15,047 Direct	+70.50%	Acquired	(price as of 2026-08-20)
March 11, 2022	IPI	F	179	$84.19	$15,070	8,825 Direct	-1.99%	Disposed	-54.4% (price as of 2026-08-20)
Dec. 15, 2021	IPI	F	387	$40.66	$15,735	9,004 Direct	-4.12%	Disposed	-5.6% (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
July 25, 2025	IPI	Performance Restricted Stock Unit	Common Stock (424)	$0.00	March 17, 2029	424	Disposed
March 17, 2025	IPI	Performance Restricted Stock Unit	Common Stock (3,397)	$0.00	March 17, 2029	3,397	Acquired
May 25, 2022	IPI	Employee Stock Option (option to purchase)	Common Stock (1,018)	$10.30	Nov. 8, 2026	1,018	Disposed

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

Initial ownership (Form 3) 2 holdings

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

Date	Ticker	Security	Shares	Ownership
Nov. 20, 2019	IPI	Common Stock	51,496	Direct
Nov. 20, 2019	IPI	Employee Stock Option (option to purchase)→ Common Stock (10,182)	10,182	Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

IPI

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2025	$429,411	—	$531,508	—	$352,325	—	$23,320	$1,336,654
2024	$375,850	$375,000	$699,965	—	$357,869	—	$25,251	$1,833,935
2023	$324,820	$30,000	$399,966	—	$142,614	—	$26,128	$923,528

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.