Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
6401
PUT
Sonos
SONO
$2.1B
| $29.5K | ﹤0.01% |
2,200
-3,900
| -64% | -$58.9K |
2018 Q3
30 quarters
|
|
|
GDXW
6402
Roundhill Gold Miners WeeklyPay ETF
GDXW
$67.2M
| $29.5K | ﹤0.01% |
+548
| New | +$34.7K |
2026 Q1
0 quarters
|
|
6403
PUT
Rexford Industrial Realty
REXR
$8.03B
| $29.5K | ﹤0.01% |
900
-4,200
| -82% | -$158K |
2022 Q3
14 quarters
|
|
6404
CALL
Spok Holdings
SPOK
$223M
| $29.4K | ﹤0.01% |
+2,700
| New | +$34.4K |
2026 Q1
0 quarters
|
|
6405
PUT
Ituran Location and Control
ITRN
$1.02B
| $29.4K | ﹤0.01% |
600
+400
| +200% | +$18.8K |
2025 Q1
4 quarters
|
|
6406
CALL
HBT Financial
HBT
$1.3B
| $29.4K | ﹤0.01% |
+1,100
| New | +$30K |
2026 Q1
0 quarters
|
|
6407
CALL
Transcat
TRNS
$844M
| $29.4K | ﹤0.01% |
+400
| New | +$28.2K |
2026 Q1
0 quarters
|
|
6408
Global X Gold Explorers ETF NEW
GOEX
$119M
| $29.4K | ﹤0.01% |
347
+337
| +3,370% | +$31K |
2025 Q3
2 quarters
|
|
|
HTO
6409
CALL
H2O America
HTO
$2.52B
| $29.3K | ﹤0.01% |
500
-300
| -38% | -$16.3K |
2025 Q2
3 quarters
|
|
|
HTO
6410
PUT
H2O America
HTO
$2.52B
| $29.3K | ﹤0.01% |
500
-300
| -38% | -$16.3K |
2024 Q1
8 quarters
|
|
|
AVGW
6411
Roundhill AVGO WeeklyPay ETF
AVGW
$41.1M
| $29.3K | ﹤0.01% |
809
+777
| +2,428% | +$32.5K |
2025 Q3
2 quarters
|
|
6412
Veracyte
VCYT
$3.55B
| $29.3K | ﹤0.01% |
909
+875
| +2,574% | +$32.4K |
2025 Q4
1 quarter
|
|
6413
PUT
DTE Energy
DTE
$25.7B
| $29.2K | ﹤0.01% |
200
| – | – |
2017 Q3
34 quarters
|
|
|
DGXX
6414
PUT
Digi Power X Inc
DGXX
$403M
| $29.2K | ﹤0.01% |
14,400
-12,800
| -47% | -$33.5K |
2025 Q4
1 quarter
|
|
|
HTFL
6415
PUT
Heartflow Inc
HTFL
$4.25B
| $29.2K | ﹤0.01% |
+1,200
| New | +$32.6K |
2026 Q1
0 quarters
|
|
6416
Horizon Technology Finance
HRZN
$310M
| $29.2K | ﹤0.01% |
6,931
+4,671
| +207% | +$27.1K |
2024 Q3
6 quarters
|
|
6417
CALL
Golub Capital BDC
GBDC
$3.28B
| $29.1K | ﹤0.01% |
2,300
-2,400
| -51% | -$30.8K |
2020 Q1
24 quarters
|
|
6418
CALL
Louisiana-Pacific
LPX
$4.51B
| $29.1K | ﹤0.01% |
400
-3,000
| -88% | -$253K |
2014 Q4
45 quarters
|
|
6419
CALL
Corpay
CPAY
$25.6B
| $29.1K | ﹤0.01% |
100
-1,300
| -93% | -$416K |
2025 Q1
4 quarters
|
|
6420
CALL
International General Insurance
IGIC
$1.04B
| $29.1K | ﹤0.01% |
+1,200
| New | +$29.4K |
2026 Q1
0 quarters
|
|
6421
CALL
Ardmore Shipping
ASC
$786M
| $29K | ﹤0.01% |
1,900
-2,000
| -51% | -$27.5K |
2019 Q1
28 quarters
|
|
6422
AdvisorShares MSOS 2X Daily ETF
MSOX
$55.7M
| $28.9K | ﹤0.01% |
13,460
+12,812
| +1,977% | +$41.1K |
2025 Q4
1 quarter
|
|
6423
J&J Snack Foods
JJSF
$1.45B
| $28.9K | ﹤0.01% |
365
-6
| -2% | -$519 |
2025 Q2
3 quarters
|
|
6424
CALL
First Industrial Realty Trust
FR
$7.8B
| $28.9K | ﹤0.01% |
+500
| New | +$29.7K |
2026 Q1
0 quarters
|
|
|
6425
PUT
First Industrial Realty Trust
FR
$7.8B
| $28.9K | ﹤0.01% |
+500
| New | +$29.7K |
2026 Q1
0 quarters
|
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.