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 | |
|---|---|---|---|---|---|---|---|
4376
CALL
Dentsply Sirona
XRAY
$1.74B
| $188K | ﹤0.01% |
16,200
+14,800
| +1,057% | +$185K |
2018 Q2
31 quarters
|
|
4377
PUT
Old National Bancorp
ONB
$9.56B
| $188K | ﹤0.01% |
+8,500
| New | +$198K |
2026 Q1
0 quarters
|
|
4378
CALL
Laser Photonics
LASE
$50.3M
| $188K | ﹤0.01% |
187,700
+151,400
| +417% | +$204K |
2024 Q4
5 quarters
|
|
|
SMC
4379
CALL
Summit Midstream
SMC
$422M
| $187K | ﹤0.01% |
+6,200
| New | +$181K |
2026 Q1
0 quarters
|
|
4380
Finance of America Companies
FOA
$120M
| $187K | ﹤0.01% |
+11,268
| New | +$233K |
2026 Q1
0 quarters
|
|
|
SNCY
4381
CALL
DELISTED
Sun Country Airlines
SNCY
| $187K | ﹤0.01% |
11,300
-1,500
| -12% | -$26.8K |
2024 Q4
5 quarters
|
|
4382
PUT
Beazer Homes USA
BZH
$891M
| $187K | ﹤0.01% |
9,700
+6,800
| +234% | +$157K |
2018 Q2
31 quarters
|
|
|
DEFT
4383
CALL
Defi Technologies
DEFT
$198M
| $186K | ﹤0.01% |
337,500
-333,800
| -50% | -$255K |
2025 Q3
2 quarters
|
|
4384
CALL
Oaktree Specialty Lending
OCSL
$1.06B
| $186K | ﹤0.01% |
+16,500
| New | +$197K |
2026 Q1
0 quarters
|
|
4385
PUT
Return Stacked Bonds & Managed Futures ETF
RSBT
$164M
| $186K | ﹤0.01% |
13,800
-240,200
| -95% | -$4.56M |
2023 Q3
10 quarters
|
|
4386
CALL
Invitation Homes
INVH
$15.6B
| $186K | ﹤0.01% |
7,500
-47,900
| -86% | -$1.25M |
2017 Q2
35 quarters
|
|
4387
CALL
Hexcel
HXL
$6.56B
| $186K | ﹤0.01% |
2,300
+1,700
| +283% | +$143K |
2023 Q1
12 quarters
|
|
|
GLIBK
4388
PUT
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$938M
| $186K | ﹤0.01% |
5,000
-300
| -6% | -$11.3K |
2025 Q4
1 quarter
|
|
4389
Assured Guaranty
AGO
$3B
| $186K | ﹤0.01% |
+2,283
| New | +$195K |
2026 Q1
0 quarters
|
|
4390
CALL
OSI Systems
OSIS
$3.13B
| $186K | ﹤0.01% |
700
+600
| +600% | +$166K |
2025 Q4
1 quarter
|
|
4391
First Trust India Nifty 50 Equal Weight ETF
NFTY
$98.6M
| $185K | ﹤0.01% |
3,602
+3,401
| +1,692% | +$190K |
2025 Q3
2 quarters
|
|
4392
PUT
Magnite
MGNI
$3.65B
| $185K | ﹤0.01% |
15,600
-153,500
| -91% | -$2.06M |
2020 Q3
22 quarters
|
|
|
NAGE
4393
CALL
Niagen Bioscience
NAGE
$212M
| $185K | ﹤0.01% |
42,000
-1,100
| -3% | -$5.94K |
2024 Q1
8 quarters
|
|
4394
Driven Brands
DRVN
$1.92B
| $185K | ﹤0.01% |
14,684
+13,878
| +1,722% | +$195K |
2025 Q3
2 quarters
|
|
4395
PUT
BlackLine
BL
$1.6B
| $185K | ﹤0.01% |
5,000
-7,100
| -59% | -$306K |
2025 Q1
4 quarters
|
|
|
BCAX
4396
PUT
Bicara Therapeutics
BCAX
$1.2B
| $185K | ﹤0.01% |
9,300
+2,500
| +37% | +$43K |
2025 Q1
4 quarters
|
|
|
LITS
4397
CALL
Lite Strategy Inc
LITS
$41.8M
| $185K | ﹤0.01% |
159,400
+130,500
| +452% | +$159K |
2025 Q3
2 quarters
|
|
4398
TD Synnex
SNX
$21.5B
| $185K | ﹤0.01% |
+1,095
| New | +$173K |
2026 Q1
0 quarters
|
|
4399
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.38B
| $184K | ﹤0.01% |
9,060
+5,861
| +183% | +$126K |
2025 Q4
1 quarter
|
|
|
ABX
4400
Abacus Global Management
ABX
$772M
| $184K | ﹤0.01% |
23,406
-32,788
| -58% | -$284K |
2024 Q4
5 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.