Ralph Brandenberger

Insider

First SEC filing: March 31, 2021 · Latest: March 31, 2021

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

NKTX selling Jan. 15, 2025

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 59 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

59 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Jan. 15, 2025	NKTX	S	7,447	$2.20	$16,383	124,796 Direct	-5.63%	Disposed	15.4% (price as of 2026-08-21)
Jan. 3, 2025	NKTX	A	105,000	—	—	105,000 Direct	—	Acquired	(price as of 2026-08-21)
Jan. 3, 2025	NKTX	A	52,500	—	—	132,243 Direct	+65.84%	Acquired	(price as of 2026-08-21)
June 18, 2024	NKTX	S	229	$5.60	$1,282	79,743 Direct	-0.29%	Disposed	-54.7% (price as of 2026-08-21)
March 1, 2024	NKTX	M 10b5-1	2,955	—	—	25,629 Direct	-10.34%	Disposed	(price as of 2026-08-21)
March 1, 2024	NKTX	M 10b5-1	3,808	—	—	22,445 Direct	-14.51%	Disposed	(price as of 2026-08-21)
March 1, 2024	NKTX	S 10b5-1	8,367	$12.51	$104,671	79,972 Direct	-9.47%	Disposed	-79.7% (price as of 2026-08-21)
March 1, 2024	NKTX	M 10b5-1	2,955	$3.89	$11,495	88,339 Direct	+3.46%	Acquired	-34.7% (price as of 2026-08-21)
March 1, 2024	NKTX	M 10b5-1	3,808	$3.89	$14,813	85,384 Direct	+4.67%	Acquired	-34.7% (price as of 2026-08-21)
Jan. 16, 2024	NKTX	S	2,512	$8.74	$21,955	81,576 Direct	-2.99%	Disposed	-71.0% (price as of 2026-08-21)
Jan. 4, 2024	NKTX	A	112,500	—	—	112,500 Direct	—	Acquired	(price as of 2026-08-21)
Jan. 4, 2024	NKTX	A	56,000	—	—	84,088 Direct	+199.37%	Acquired	(price as of 2026-08-21)
June 20, 2023	NKTX	S	221	$4.85	$1,072	28,088 Direct	-0.78%	Disposed	-47.7% (price as of 2026-08-21)
Jan. 17, 2023	NKTX	S	491	$5.49	$2,696	28,309 Direct	-1.70%	Disposed	-53.8% (price as of 2026-08-21)
Jan. 13, 2023	NKTX	A	42,000	—	—	42,000 Direct	—	Acquired	(price as of 2026-08-21)
Jan. 13, 2023	NKTX	A	21,000	—	—	28,800 Direct	+269.23%	Acquired	(price as of 2026-08-21)
Oct. 6, 2022	NKTX	M 10b5-1	842	—	—	28,584 Direct	-2.86%	Disposed	(price as of 2026-08-21)
Oct. 6, 2022	NKTX	S 10b5-1	842	$14.02	$11,805	7,800 Direct	-9.74%	Disposed	-81.9% (price as of 2026-08-21)
Oct. 6, 2022	NKTX	M 10b5-1	842	$3.89	$3,275	8,642 Direct	+10.79%	Acquired	-34.7% (price as of 2026-08-21)
Aug. 15, 2022	NKTX	M 10b5-1	11,000	—	—	26,253 Direct	-29.53%	Disposed	(price as of 2026-08-21)
Aug. 15, 2022	NKTX	S 10b5-1	11,000	$17.64	$194,040	7,800 Direct	-58.51%	Disposed	-85.6% (price as of 2026-08-21)
Aug. 15, 2022	NKTX	M 10b5-1	11,000	$3.89	$42,790	18,800 Direct	+141.03%	Acquired	-34.7% (price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	340	—	—	8,445 Direct	-3.87%	Disposed	(price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	6,886	—	—	37,253 Direct	-15.60%	Disposed	(price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	4,367	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Aug. 8, 2022	NKTX	S 10b5-1	11,593	$15.51	$179,807	7,800 Direct	-59.78%	Disposed	-83.6% (price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	340	$4.77	$1,622	19,393 Direct	+1.78%	Acquired	-46.8% (price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	6,886	$3.89	$26,787	19,053 Direct	+56.60%	Acquired	-34.7% (price as of 2026-08-21)
Aug. 8, 2022	NKTX	M 10b5-1	4,367	$0.41	$1,790	12,167 Direct	+55.99%	Acquired	519.1% (price as of 2026-08-21)
July 25, 2022	NKTX	M 10b5-1	3,000	—	—	4,367 Direct	-40.72%	Disposed	(price as of 2026-08-21)
July 25, 2022	NKTX	S 10b5-1	3,000	$13.41	$40,230	7,800 Direct	-27.78%	Disposed	-81.1% (price as of 2026-08-21)
July 25, 2022	NKTX	M 10b5-1	3,000	$0.41	$1,230	10,800 Direct	+38.46%	Acquired	519.1% (price as of 2026-08-21)
July 15, 2022	NKTX	A	20,000	—	—	20,000 Direct	—	Acquired	(price as of 2026-08-21)
June 17, 2022	NKTX	A	15,000	—	—	15,000 Direct	—	Acquired	(price as of 2026-08-21)
June 17, 2022	NKTX	A	2,500	—	—	7,800 Direct	+47.17%	Acquired	(price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	2,037	—	—	44,139 Direct	-4.41%	Disposed	(price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	1,358	—	—	29,426 Direct	-4.41%	Disposed	(price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	405	—	—	8,785 Direct	-4.41%	Disposed	(price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	340	—	—	7,367 Direct	-4.41%	Disposed	(price as of 2026-08-21)
June 3, 2022	NKTX	S 10b5-1	4,140	$15.00	$62,100	5,300 Direct	-43.86%	Disposed	-83.1% (price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	2,037	$3.89	$7,924	9,440 Direct	+27.52%	Acquired	-34.7% (price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	1,358	$3.89	$5,283	7,403 Direct	+22.46%	Acquired	-34.7% (price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	405	$4.77	$1,932	6,045 Direct	+7.18%	Acquired	-46.8% (price as of 2026-08-21)
June 3, 2022	NKTX	M 10b5-1	340	$0.41	$139	5,640 Direct	+6.42%	Acquired	519.1% (price as of 2026-08-21)
Jan. 14, 2022	NKTX	A	31,400	—	—	31,400 Direct	—	Acquired	(price as of 2026-08-21)
Jan. 14, 2022	NKTX	A	5,300	—	—	5,300 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	2,037	—	—	46,176 Direct	-4.23%	Disposed	(price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	1,358	—	—	30,784 Direct	-4.23%	Disposed	(price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	405	—	—	9,190 Direct	-4.22%	Disposed	(price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	340	—	—	7,707 Direct	-4.23%	Disposed	(price as of 2026-08-21)
Dec. 1, 2021	NKTX	S 10b5-1	4,140	$15.64	$64,750	0 Direct	-100.00%	Disposed	-83.8% (price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	2,037	$3.89	$7,924	4,140 Direct	+96.86%	Acquired	-34.7% (price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	1,358	$3.89	$5,283	2,103 Direct	+182.28%	Acquired	-34.7% (price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	405	$4.77	$1,932	745 Direct	+119.12%	Acquired	-46.8% (price as of 2026-08-21)
Dec. 1, 2021	NKTX	M 10b5-1	340	$0.41	$139	340 Direct	—	Acquired	519.1% (price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	2,037	$3.89	$7,924	4,140 Direct	+96.86%	Acquired	-34.7% (price as of 2026-08-21)
Sept. 1, 2021	NKTX	S 10b5-1	4,140	$32.08	$132,811	0 Direct	-100.00%	Disposed	-92.1% (price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	340	—	—	8,047 Direct	-4.05%	Disposed	(price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	1,358	—	—	32,142 Direct	-4.05%	Disposed	(price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	2,037	—	—	48,213 Direct	-4.05%	Disposed	(price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	405	—	—	9,595 Direct	-4.05%	Disposed	(price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	1,358	$3.89	$5,283	2,103 Direct	+182.28%	Acquired	-34.7% (price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	405	$4.77	$1,932	745 Direct	+119.12%	Acquired	-46.8% (price as of 2026-08-21)
Sept. 1, 2021	NKTX	M 10b5-1	340	$0.41	$139	340 Direct	—	Acquired	519.1% (price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	2,037	—	—	50,250 Direct	-3.90%	Disposed	(price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	1,358	—	—	33,500 Direct	-3.90%	Disposed	(price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	405	—	—	10,000 Direct	-3.89%	Disposed	(price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	340	—	—	8,387 Direct	-3.90%	Disposed	(price as of 2026-08-21)
June 2, 2021	NKTX	S 10b5-1	4,140	$24.50	$101,430	0 Direct	-100.00%	Disposed	-89.6% (price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	2,037	$3.89	$7,924	4,140 Direct	+96.86%	Acquired	-34.7% (price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	1,358	$3.89	$5,283	2,103 Direct	+182.28%	Acquired	-34.7% (price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	405	$4.77	$1,932	745 Direct	+119.12%	Acquired	-46.8% (price as of 2026-08-21)
June 2, 2021	NKTX	M 10b5-1	340	$0.41	$139	340 Direct	—	Acquired	519.1% (price as of 2026-08-21)

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
Jan. 3, 2025	NKTX	Stock Option (right to buy)	Common Stock (105,000)	$2.50	Jan. 2, 2035	105,000	Acquired
March 1, 2024	NKTX	Stock Option (right to buy)	Common Stock (2,955)	$3.89	Sept. 5, 2029	2,955	Disposed
March 1, 2024	NKTX	Stock Option (right to buy)	Common Stock (3,808)	$3.89	Sept. 5, 2029	3,808	Disposed
Jan. 4, 2024	NKTX	Stock Option (right to buy)	Common Stock (112,500)	$6.01	Jan. 3, 2034	112,500	Acquired
Jan. 13, 2023	NKTX	Stock Option (right to buy)	Common Stock (42,000)	$5.57	Jan. 12, 2033	42,000	Acquired
Oct. 6, 2022	NKTX	Stock Option (right to buy)	Common Stock (842)	$3.89	Sept. 5, 2029	842	Disposed
Aug. 15, 2022	NKTX	Stock Option (right to buy)	Common Stock (11,000)	$3.89	Sept. 5, 2029	11,000	Disposed
Aug. 8, 2022	NKTX	Stock Option (right to buy)	Common Stock (340)	$4.77	May 10, 2029	340	Disposed
Aug. 8, 2022	NKTX	Stock Option (right to buy)	Common Stock (6,886)	$3.89	Sept. 5, 2029	6,886	Disposed
Aug. 8, 2022	NKTX	Stock Option (right to buy)	Common Stock (4,367)	$0.41	July 18, 2028	4,367	Disposed
July 25, 2022	NKTX	Stock Option (right to buy)	Common Stock (3,000)	$0.41	July 18, 2028	3,000	Disposed
July 15, 2022	NKTX	Stock Option (right to buy)	Common Stock (20,000)	$14.19	July 14, 2032	20,000	Acquired
June 17, 2022	NKTX	Stock Option (right to buy)	Common Stock (15,000)	$12.25	June 16, 2032	15,000	Acquired
June 3, 2022	NKTX	Stock Option (right to buy)	Common Stock (2,037)	$3.89	Sept. 5, 2029	2,037	Disposed
June 3, 2022	NKTX	Stock Option (right to buy)	Common Stock (1,358)	$3.89	Sept. 5, 2029	1,358	Disposed
June 3, 2022	NKTX	Stock Option (right to buy)	Common Stock (405)	$4.77	May 10, 2029	405	Disposed
June 3, 2022	NKTX	Stock Option (right to buy)	Common Stock (340)	$0.41	July 18, 2028	340	Disposed
Jan. 14, 2022	NKTX	Stock Option (right to buy)	Common Stock (31,400)	$12.14	Jan. 13, 2032	31,400	Acquired
Dec. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (2,037)	$3.89	Sept. 5, 2029	2,037	Disposed
Dec. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (1,358)	$3.89	Sept. 5, 2029	1,358	Disposed
Dec. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (405)	$4.77	May 10, 2029	405	Disposed
Dec. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (340)	$0.41	July 18, 2028	340	Disposed
Sept. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (340)	$0.41	July 18, 2028	340	Disposed
Sept. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (1,358)	$3.89	Sept. 5, 2029	1,358	Disposed
Sept. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (2,037)	$3.89	Sept. 5, 2029	2,037	Disposed
Sept. 1, 2021	NKTX	Stock Option (right to buy)	Common Stock (405)	$4.77	May 10, 2029	405	Disposed
June 2, 2021	NKTX	Stock Option (right to buy)	Common Stock (2,037)	$3.89	Sept. 5, 2029	2,037	Disposed
June 2, 2021	NKTX	Stock Option (right to buy)	Common Stock (1,358)	$3.89	Sept. 5, 2029	1,358	Disposed
June 2, 2021	NKTX	Stock Option (right to buy)	Common Stock (405)	$4.77	May 10, 2029	405	Disposed
June 2, 2021	NKTX	Stock Option (right to buy)	Common Stock (340)	$0.41	July 18, 2028	340	Disposed

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

Initial ownership (Form 3) 7 holdings

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

Date	Ticker	Security	Shares	Ownership
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (8,727)	8,727	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (10,405)	10,405	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (52,287)	52,287	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (34,858)	34,858	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (18,480)	18,480	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (17,710)	17,710	Direct
March 31, 2021	NKTX	Stock Option (right to buy)→ Common Stock (30,000)	30,000	Direct