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 | |
|---|---|---|---|---|---|---|---|
4926
PUT
Dana Inc
DAN
$3B
| $114K | ﹤0.01% |
3,400
-19,700
| -85% | -$616K |
2018 Q1
32 quarters
|
|
|
TECX
4927
CALL
Tectonic Therapeutic
TECX
$441M
| $114K | ﹤0.01% |
3,700
-1,800
| -33% | -$44.3K |
2025 Q2
3 quarters
|
|
4928
PUT
VanEck Energy Income ETF
EINC
$78.9M
| $114K | ﹤0.01% |
+3,300
| New | +$358K |
2026 Q1
0 quarters
|
|
4929
CALL
Inhibrx
INBX
$1.43B
| $114K | ﹤0.01% |
1,700
-1,700
| -50% | -$126K |
2025 Q3
2 quarters
|
|
|
CTRA
4930
DELISTED
Coterra Energy
CTRA
| $114K | ﹤0.01% |
+3,248
| New | +$97.6K |
2026 Q1
0 quarters
|
|
4931
CALL
State Street
STT
$48.3B
| $114K | ﹤0.01% |
900
-10,300
| -92% | -$1.32M |
2014 Q4
45 quarters
|
|
4932
PUT
Boise Cascade
BCC
$2.62B
| $114K | ﹤0.01% |
1,500
-200
| -12% | -$16K |
2025 Q2
3 quarters
|
|
4933
Darling Ingredients
DAR
$9.93B
| $114K | ﹤0.01% |
1,839
-13,666
| -88% | -$673K |
2023 Q4
9 quarters
|
|
4934
CALL
FerroAtlántica
GSM
$796M
| $114K | ﹤0.01% |
27,600
+10,200
| +59% | +$49.1K |
2020 Q4
21 quarters
|
|
|
SFIX
4935
Stitch Fix
SFIX
$349M
| $114K | ﹤0.01% |
34,332
-50,078
| -59% | -$204K |
2025 Q3
2 quarters
|
|
4936
PUT
Oceaneering
OII
$4.41B
| $114K | ﹤0.01% |
+3,200
| New | +$104K |
2026 Q1
0 quarters
|
|
4937
Ascent Industries
ACNT
$124M
| $113K | ﹤0.01% |
8,517
-7,415
| -47% | -$115K |
2025 Q4
1 quarter
|
|
4938
PUT
Braze
BRZE
$2.89B
| $113K | ﹤0.01% |
4,800
-56,000
| -92% | -$1.21M |
2022 Q2
15 quarters
|
|
4939
CALL
Chemed
CHE
$6.63B
| $113K | ﹤0.01% |
+300
| New | +$128K |
2026 Q1
0 quarters
|
|
4940
CALL
Pangaea Logistics
PANL
$552M
| $113K | ﹤0.01% |
+16,000
| New | +$126K |
2026 Q1
0 quarters
|
|
4941
Arbe Robotics
ARBE
$78.6M
| $113K | ﹤0.01% |
185,701
+181,908
| +4,796% | +$189K |
2025 Q3
2 quarters
|
|
4942
PUT
TRX Gold Corp
TRX
$393M
| $113K | ﹤0.01% |
+75,500
| New | +$111K |
2026 Q1
0 quarters
|
|
|
DRNZ
4943
REX Drone ETF
DRNZ
$106M
| $113K | ﹤0.01% |
+4,722
| New | +$123K |
2026 Q1
0 quarters
|
|
4944
CALL
Akebia Therapeutics
AKBA
$240M
| $113K | ﹤0.01% |
81,100
-61,200
| -43% | -$84.1K |
2018 Q2
31 quarters
|
|
|
RAPP
4945
PUT
Rapport Therapeutics
RAPP
$1.54B
| $113K | ﹤0.01% |
+3,600
| New | +$101K |
2026 Q1
0 quarters
|
|
4946
Cognex
CGNX
$10.9B
| $112K | ﹤0.01% |
2,296
-6,613
| -74% | -$309K |
2024 Q2
7 quarters
|
|
4947
iShares Core S&P US Growth ETF
IUSG
$34.4B
| $112K | ﹤0.01% |
723
-7,972
| -92% | -$1.31M |
2025 Q4
1 quarter
|
|
4948
CALL
Richardson Electronics
RELL
$282M
| $112K | ﹤0.01% |
+10,200
| New | +$119K |
2026 Q1
0 quarters
|
|
4949
PUT
Vestis
VSTS
$1.85B
| $112K | ﹤0.01% |
14,200
+500
| +4% | +$3.65K |
2023 Q4
9 quarters
|
|
|
SEV
4950
CALL
Aptera Motors
SEV
$67.3M
| $112K | ﹤0.01% |
42,100
+42,000
| +42,000% | +$112K |
2025 Q4
1 quarter
|
|
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.