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 | |
|---|---|---|---|---|---|---|
5426
Rocket Lab Corp
RKLB
$39.9B
| $74.2K | ﹤0.01% |
1,155
-398,955
| -100% | -$30.1M |
|
|
LTM
5427
PUT
LATAM Airlines Group S.A.
LTM
$14.4B
| $74.2K | ﹤0.01% |
1,500
+1,000
| +200% | +$56.5K |
|
5428
CALL
Korea Electric Power
KEP
$15.5B
| $74.1K | ﹤0.01% |
5,200
+1,200
| +30% | +$22.7K |
|
5429
CALL
News Corp Class B
NWS
$16.4B
| $74.1K | ﹤0.01% |
2,800
-37,000
| -93% | -$1.04M |
|
5430
iShares Europe ETF
IEV
$1.63B
| $74.1K | ﹤0.01% |
1,090
+538
| +97% | +$37.9K |
|
|
CTO
5431
CALL
CTO Realty Growth
CTO
$743M
| $74K | ﹤0.01% |
4,000
+900
| +29% | +$16.8K |
|
|
CEPO
5432
Cantor Equity Partners I
CEPO
$272M
| $73.9K | ﹤0.01% |
+7,035
| New | +$73.6K |
|
5433
PUT
Porch Group
PRCH
$1.3B
| $73.9K | ﹤0.01% |
10,300
+5,700
| +124% | +$45.5K |
|
5434
Saic
SAIC
$5.03B
| $73.8K | ﹤0.01% |
+778
| New | +$76.3K |
|
|
ONT
5435
Onterris Inc
ONT
$710M
| $73.8K | ﹤0.01% |
+3,373
| New | +$81K |
|
5436
CALL
US Foods
USFD
$21.4B
| $73.8K | ﹤0.01% |
800
-600
| -43% | -$53.1K |
|
5437
PUT
VSE Corp
VSEC
$5.48B
| $73.8K | ﹤0.01% |
+400
| New | +$81.4K |
|
5438
CALL
Sinclair Inc
SBGI
$974M
| $73.8K | ﹤0.01% |
5,700
-40,800
| -88% | -$593K |
|
5439
CALL
Regencell Bioscience
RGC
$2.83B
| $73.7K | ﹤0.01% |
+2,900
| New | +$82.1K |
|
5440
Erie Indemnity
ERIE
$11.7B
| $73.6K | ﹤0.01% |
293
+292
| +29,200% | +$78.4K |
|
5441
AptarGroup
ATR
$8.45B
| $73.6K | ﹤0.01% |
584
-2,950
| -83% | -$384K |
|
5442
iShares MSCI Agriculture Producers ETF
VEGI
$159M
| $73.6K | ﹤0.01% |
+1,626
| New | +$71.4K |
|
5443
CALL
SandRidge Energy
SD
$510M
| $73.4K | ﹤0.01% |
4,500
+2,500
| +125% | +$40.5K |
|
5444
Teekay
TK
$975M
| $73.3K | ﹤0.01% |
6,006
-16,585
| -73% | -$183K |
|
5445
CALL
American Century Diversified Corporate Bond ETF
KORP
$860M
| $73.2K | ﹤0.01% |
800
-1,700
| -68% | -$80.4K |
|
|
BBBY
5446
CALL
Bed Bath & Beyond
BBBY
$473M
| $73.2K | ﹤0.01% |
19,000
-207,100
| -92% | -$1.16M |
|
5447
CALL
Dorchester Minerals
DMLP
$1.34B
| $73.2K | ﹤0.01% |
2,700
+1,700
| +170% | +$43.2K |
|
5448
PUT
Dimensional US Core Equity Market ETF
DFAU
$12.3B
| $73.1K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$89.3K |
|
5449
CALL
Aclaris Therapeutics
ACRS
$730M
| $73.1K | ﹤0.01% |
19,500
+18,500
| +1,850% | +$62.4K |
|
5450
Live Oak Bancshares
LOB
$1.95B
| $72.9K | ﹤0.01% |
+2,204
| New | +$81.2K |
|
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.