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 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ONIT
6801
CALL
Onity Group
ONIT
$336M
| $19.6K | ﹤0.01% |
500
-6,100
| -92% | -$265K |
|
6802
Delcath Systems
DCTH
$435M
| $19.6K | ﹤0.01% |
2,107
-11,176
| -84% | -$108K |
|
6803
BJ's Restaurants
BJRI
$1.43B
| $19.5K | ﹤0.01% |
+556
| New | +$22.2K |
|
6804
CALL
Sensus Healthcare
SRTS
$50M
| $19.5K | ﹤0.01% |
4,900
+3,100
| +172% | +$13.8K |
|
6805
Offerpad Solutions
OPAD
$23.4M
| $19.4K | ﹤0.01% |
+2,963
| New | +$29.1K |
|
6806
GeneDx Holdings
WGS
$1.82B
| $19.4K | ﹤0.01% |
+302
| New | +$27.5K |
|
|
WSR
6807
CALL
DELISTED
Whitestone REIT
WSR
| $19.4K | ﹤0.01% |
1,200
-700
| -37% | -$10.5K |
|
6808
PUT
ESAB
ESAB
$5.29B
| $19.3K | ﹤0.01% |
+200
| New | +$23.2K |
|
6809
Precision BioSciences
DTIL
$189M
| $19.3K | ﹤0.01% |
3,512
+99
| +3% | +$457 |
|
6810
CALL
Blackbaud
BLKB
$1.4B
| $19.3K | ﹤0.01% |
+500
| New | +$25K |
|
6811
Chemed
CHE
$6.7B
| $19.3K | ﹤0.01% |
+51
| New | +$21.8K |
|
6812
Expensify
EXFY
$169M
| $19.3K | ﹤0.01% |
22,133
+8,895
| +67% | +$10.6K |
|
6813
PUT
WhiteHorse Finance
WHF
$137M
| $19.2K | ﹤0.01% |
2,600
+1,100
| +73% | +$7.57K |
|
6814
CALL
Runway Growth Finance
RWAY
$235M
| $19.2K | ﹤0.01% |
2,800
| – | – |
|
|
WW
6815
CALL
WW International
WW
$151M
| $19.2K | ﹤0.01% |
1,400
-131,800
| -99% | -$2.95M |
|
6816
CALL
Park Aerospace
PKE
$708M
| $19.2K | ﹤0.01% |
700
| – | – |
|
6817
CALL
Prelude Therapeutics
PRLD
$315M
| $19.2K | ﹤0.01% |
5,600
-800
| -13% | -$2.1K |
|
6818
TRX Gold Corp
TRX
$285M
| $19.1K | ﹤0.01% |
+12,745
| New | +$18.8K |
|
6819
PUT
KRONOS Worldwide
KRO
$832M
| $19.1K | ﹤0.01% |
2,900
+2,300
| +383% | +$13K |
|
6820
PUT
Lindblad Expeditions
LIND
$1.82B
| $19K | ﹤0.01% |
+1,100
| New | +$19.5K |
|
6821
CALL
Goldgroup Mining Inc.
GORO
$420M
| $19K | ﹤0.01% |
15,800
-82,000
| -84% | -$111K |
|
6822
PUT
IDEX
IEX
$16.4B
| $19K | ﹤0.01% |
+100
| New | +$19.7K |
|
6823
PUT
Rentokil
RTO
$15.1B
| $18.9K | ﹤0.01% |
+600
| New | +$18.9K |
|
6824
PUT
NET Power
NPWR
$132M
| $18.9K | ﹤0.01% |
12,100
-300
| -2% | -$640 |
|
6825
SITE Centers
SITC
$227M
| $18.9K | ﹤0.01% |
+3,495
| New | +$21.4K |
|
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 withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- 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 2,156 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.