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 | |
|---|---|---|---|---|---|---|---|
5526
CALL
Westamerica Bancorp
WABC
$1.38B
| $67.8K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$60.9K |
2025 Q1
4 quarters
|
|
5527
PUT
Dycom Industries
DY
$8.26B
| $67.8K | ﹤0.01% |
200
| – | – |
2022 Q3
14 quarters
|
|
|
LENZ
5528
CALL
LENZ Therapeutics
LENZ
$112M
| $67.7K | ﹤0.01% |
7,400
-69,400
| -90% | -$975K |
2025 Q2
3 quarters
|
|
5529
MarineMax
HZO
$1.16B
| $67.7K | ﹤0.01% |
2,502
+2,207
| +748% | +$61.2K |
2025 Q3
2 quarters
|
|
5530
CALL
Heartland Express
HTLD
$920M
| $67.6K | ﹤0.01% |
6,500
+6,400
| +6,400% | +$67.5K |
2023 Q3
10 quarters
|
|
5531
PUT
Adecoagro
AGRO
$1.46B
| $67.6K | ﹤0.01% |
4,500
-10,400
| -70% | -$103K |
2025 Q4
1 quarter
|
|
|
SOLT
5532
2x Solana ETF
SOLT
$235M
| $67.6K | ﹤0.01% |
+1,490
| New | +$124K |
2026 Q1
0 quarters
|
|
|
NAKA
5533
CALL
Nakamoto Inc
NAKA
$173M
| $67.3K | ﹤0.01% |
7,618
-3,915
| -34% | -$49.6K |
2025 Q3
2 quarters
|
|
5534
PUT
Prosperity Bancshares
PB
$8.1B
| $67.2K | ﹤0.01% |
1,000
| – | – |
2025 Q4
1 quarter
|
|
5535
CALL
Angi Inc
ANGI
$245M
| $67.1K | ﹤0.01% |
9,800
+4,400
| +81% | +$44.1K |
2025 Q1
4 quarters
|
|
5536
PUT
Navient
NAVI
$862M
| $67.1K | ﹤0.01% |
+8,200
| New | +$81.2K |
2026 Q1
0 quarters
|
|
|
MREO
5537
CALL
Mereo BioPharma
MREO
$60.7M
| $67K | ﹤0.01% |
203,100
+35,800
| +21% | +$15.4K |
2022 Q1
16 quarters
|
|
5538
CRISPR Therapeutics
CRSP
$5.36B
| $66.9K | ﹤0.01% |
+1,407
| New | +$74.2K |
2026 Q1
0 quarters
|
|
5539
CALL
ScottsMiracle-Gro
SMG
$2.85B
| $66.9K | ﹤0.01% |
1,100
-5,700
| -84% | -$369K |
2016 Q1
40 quarters
|
|
5540
Lightbridge
LTBR
$225M
| $66.8K | ﹤0.01% |
6,263
-6,634
| -51% | -$92.2K |
2025 Q3
2 quarters
|
|
5541
PUT
Gladstone Investment Corp
GAIN
$624M
| $66.7K | ﹤0.01% |
4,700
+2,100
| +81% | +$29.3K |
2020 Q1
24 quarters
|
|
5542
CALL
US Commodity Index
USCI
$409M
| $66.7K | ﹤0.01% |
+700
| New | +$60K |
2026 Q1
0 quarters
|
|
|
AVL
5543
Direxion Daily AVGO Bull 2X ETF
AVL
$260M
| $66.4K | ﹤0.01% |
2,021
-201
| -9% | -$7.77K |
2025 Q4
1 quarter
|
|
5544
CALL
Saic
SAIC
$5.25B
| $66.4K | ﹤0.01% |
+700
| New | +$68.6K |
2026 Q1
0 quarters
|
|
5545
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.56B
| $66.4K | ﹤0.01% |
+1,480
| New | +$67.3K |
2026 Q1
0 quarters
|
|
5546
Allot
ALLT
$416M
| $66.3K | ﹤0.01% |
9,960
+8,023
| +414% | +$70.7K |
2023 Q1
12 quarters
|
|
5547
CALL
Alector
ALEC
$202M
| $66.2K | ﹤0.01% |
30,800
-236,400
| -88% | -$475K |
2024 Q4
5 quarters
|
|
5548
PUT
Odyssey Marine Exploration
OMEX
$39M
| $66.2K | ﹤0.01% |
79,400
-177,500
| -69% | -$302K |
2023 Q1
12 quarters
|
|
5549
Frontier Group Holdings
ULCC
$1.43B
| $66.1K | ﹤0.01% |
18,739
-30,543
| -62% | -$140K |
2025 Q3
2 quarters
|
|
5550
PUT
Regencell Bioscience
RGC
$3.37B
| $66.1K | ﹤0.01% |
+2,600
| New | +$73.6K |
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.