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 | |
|---|---|---|---|---|---|---|
|
OPTU
6076
CALL
Optimum Communications Inc
OPTU
$350M
| $41.3K | ﹤0.01% |
31,800
-40,000
| -56% | -$62.9K |
|
6077
ProShares Ultra Bitcoin ETF
BITU
$375M
| $41.3K | ﹤0.01% |
+3,548
| New | +$57.3K |
|
6078
PUT
Phathom Pharmaceuticals
PHAT
$933M
| $41.1K | ﹤0.01% |
3,700
+700
| +23% | +$8.84K |
|
6079
Acumen Pharmaceuticals
ABOS
$160M
| $41.1K | ﹤0.01% |
+17,414
| New | +$44.4K |
|
6080
Park Aerospace
PKE
$728M
| $41.1K | ﹤0.01% |
1,500
-3,665
| -71% | -$93.8K |
|
6081
CALL
Avita Medical
RCEL
$152M
| $41.1K | ﹤0.01% |
11,100
-42,000
| -79% | -$176K |
|
6082
CALL
Sprout Social
SPT
$457M
| $41K | ﹤0.01% |
7,200
-33,200
| -82% | -$256K |
|
6083
Enlight Renewable Energy
ENLT
$12.8B
| $41K | ﹤0.01% |
+601
| New | +$38.4K |
|
6084
PUT
ACI Worldwide
ACIW
$5.56B
| $41K | ﹤0.01% |
1,000
-3,800
| -79% | -$160K |
|
6085
CALL
Genpact
G
$5.09B
| $41K | ﹤0.01% |
1,100
-1,100
| -50% | -$45.3K |
|
|
FIRY
6086
PUT
Firy Inc
FIRY
$130M
| $40.9K | ﹤0.01% |
15,800
+14,500
| +1,115% | +$51.8K |
|
6087
Ceragon Networks
CRNT
$205M
| $40.7K | ﹤0.01% |
+18,862
| New | +$42.7K |
|
6088
Caledonia Mining Corp
CMCL
$360M
| $40.7K | ﹤0.01% |
1,801
+433
| +32% | +$12.1K |
|
6089
PUT
Lincoln Educational Services
LINC
$1.27B
| $40.7K | ﹤0.01% |
+1,000
| New | +$31.5K |
|
6090
PUT
SIGA Technologies
SIGA
$243M
| $40.7K | ﹤0.01% |
7,600
+3,900
| +105% | +$24.3K |
|
|
BIOA
6091
BioAge Labs
BIOA
$975M
| $40.6K | ﹤0.01% |
2,322
-538
| -19% | -$10.4K |
|
|
ADAM
6092
PUT
Adamas Trust
ADAM
$790M
| $40.5K | ﹤0.01% |
5,500
+3,600
| +189% | +$28.7K |
|
6093
WisdomTree Artificial Intelligence and Innovation Fund
WTAI
$621M
| $40.5K | ﹤0.01% |
1,433
-343
| -19% | -$10.2K |
|
6094
CALL
Pyxis Oncology
PYXS
$160M
| $40.4K | ﹤0.01% |
27,700
-55,700
| -67% | -$84K |
|
6095
CALL
Wheels Up
UP
$224M
| $40.4K | ﹤0.01% |
3,915
-9,055
| -70% | -$118K |
|
6096
CALL
Sixth Street Specialty
TSLX
$1.59B
| $40.4K | ﹤0.01% |
+2,200
| New | +$43.5K |
|
6097
PUT
Life Time Group Holdings
LTH
$9.36B
| $40.4K | ﹤0.01% |
+1,500
| New | +$41.5K |
|
6098
PUT
Photronics
PLAB
$1.84B
| $40.4K | ﹤0.01% |
1,000
-5,500
| -85% | -$199K |
|
6099
CALL
Breakwave Tanker Shipping ETF
BWET
$29.8M
| $40.4K | ﹤0.01% |
500
-400
| -44% | -$21K |
|
6100
PUT
International Bancshares
IBOC
$4.72B
| $40.4K | ﹤0.01% |
+600
| New | +$41.6K |
|
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.