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 | |
|---|---|---|---|---|---|---|
6501
PUT
Insteel Industries
IIIN
$617M
| $26.9K | ﹤0.01% |
800
-1,600
| -67% | -$54.9K |
|
6502
CALL
Apogee Enterprises
APOG
$833M
| $26.8K | ﹤0.01% |
800
-9,500
| -92% | -$352K |
|
|
ZENA
6503
CALL
ZenaTech Inc
ZENA
$131M
| $26.8K | ﹤0.01% |
11,700
-29,300
| -71% | -$88.7K |
|
6504
Teleflex
TFX
$5.98B
| $26.8K | ﹤0.01% |
+224
| New | +$24.7K |
|
6505
Washington Trust Bancorp
WASH
$731M
| $26.8K | ﹤0.01% |
+800
| New | +$26.4K |
|
|
SEM
6506
DELISTED
Select Medical
SEM
| $26.7K | ﹤0.01% |
1,642
-328
| -17% | -$5.13K |
|
6507
PUT
Anterix
ATEX
$2.04B
| $26.7K | ﹤0.01% |
700
-8,900
| -93% | -$282K |
|
|
QTOP
6508
iShares Nasdaq Top 30 Stocks ETF
QTOP
$289M
| $26.7K | ﹤0.01% |
892
-442
| -33% | -$13.9K |
|
6509
Global Net Lease
GNL
$1.93B
| $26.7K | ﹤0.01% |
2,851
-1,263
| -31% | -$11.9K |
|
6510
Cardiff Oncology
CRDF
$66.6M
| $26.7K | ﹤0.01% |
+16,454
| New | +$33.8K |
|
6511
CALL
Goldman Sachs BDC
GSBD
$975M
| $26.6K | ﹤0.01% |
3,000
+700
| +30% | +$6.46K |
|
6512
PUT
Manhattan Associates
MANH
$8.83B
| $26.6K | ﹤0.01% |
200
-300
| -60% | -$44.9K |
|
|
ADUR
6513
Aduro Clean Technologies
ADUR
$506M
| $26.6K | ﹤0.01% |
+2,533
| New | +$30K |
|
|
BDN
6514
CALL
Brandywine Realty Trust
BDN
$532M
| $26.6K | ﹤0.01% |
9,800
+1,600
| +20% | +$4.79K |
|
|
CRWL
6515
GraniteShares 2x Long CRWD Daily ETF
CRWL
$42.7M
| $26.5K | ﹤0.01% |
1,399
-54
| -4% | -$1.3K |
|
6516
PUT
Outfront Media
OUT
$5.6B
| $26.5K | ﹤0.01% |
1,000
+900
| +900% | +$23.5K |
|
6517
CALL
GrafTech
EAF
$177M
| $26.4K | ﹤0.01% |
3,900
-2,300
| -37% | -$24.3K |
|
6518
PUT
Adeia
ADEA
$3.03B
| $26.4K | ﹤0.01% |
1,100
-2,400
| -69% | -$48.7K |
|
6519
CALL
Stagwell
STGW
$1.73B
| $26.4K | ﹤0.01% |
+4,200
| New | +$23.5K |
|
|
GRCE
6520
PUT
Grace Therapeutics
GRCE
$39.1M
| $26.4K | ﹤0.01% |
+5,700
| New | +$22.4K |
|
6521
CALL
Qualys
QLYS
$4.91B
| $26.4K | ﹤0.01% |
300
+200
| +200% | +$22.2K |
|
6522
PUT
BlackRock TCP Capital
TCPC
$268M
| $26.4K | ﹤0.01% |
7,300
+7,200
| +7,200% | +$33.4K |
|
|
SLN
6523
PUT
Silence Therapeutics
SLN
$546M
| $26.4K | ﹤0.01% |
5,000
-900
| -15% | -$4.96K |
|
6524
PUT
Otter Tail
OTTR
$3.86B
| $26.3K | ﹤0.01% |
300
-700
| -70% | -$60.6K |
|
6525
PUT
OneSpan
OSPN
$566M
| $26.3K | ﹤0.01% |
2,500
+1,100
| +79% | +$12.5K |
|
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.