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 | |
|---|---|---|---|---|---|---|
4501
PUT
Idexx Laboratories
IDXX
$44.9B
| $169K | ﹤0.01% |
300
-300
| -50% | -$192K |
|
|
RAL
4502
Ralliant Corp
RAL
$7.5B
| $169K | ﹤0.01% |
4,052
-5,193
| -56% | -$244K |
|
4503
PUT
Compass Diversified
CODI
$752M
| $168K | ﹤0.01% |
21,400
-1,100
| -5% | -$7K |
|
4504
ProShares Trust UltraShort Lehman 7-10 Year Treasury
PST
$10.6M
| $168K | ﹤0.01% |
+7,479
| New | +$166K |
|
4505
CALL
USA Compression Partners
USAC
$3.69B
| $168K | ﹤0.01% |
6,200
-13,600
| -69% | -$361K |
|
4506
PUT
Kimbell Royalty Partners
KRP
$1.46B
| $168K | ﹤0.01% |
11,600
-11,500
| -50% | -$157K |
|
4507
PUT
Doximity
DOCS
$3.89B
| $168K | ﹤0.01% |
7,200
-45,200
| -86% | -$1.41M |
|
4508
Winnebago Industries
WGO
$900M
| $168K | ﹤0.01% |
5,413
-34,832
| -87% | -$1.45M |
|
4509
Phunware
PHUN
$42.9M
| $168K | ﹤0.01% |
94,692
+94,641
| +185,571% | +$172K |
|
4510
Kornit Digital
KRNT
$677M
| $167K | ﹤0.01% |
11,422
+3,798
| +50% | +$55.6K |
|
4511
PACCAR
PCAR
$70.5B
| $167K | ﹤0.01% |
+1,448
| New | +$175K |
|
4512
CALL
Immunic
IMUX
$178M
| $167K | ﹤0.01% |
15,060
+2,400
| +19% | +$21.5K |
|
4513
Ambarella
AMBA
$3.04B
| $167K | ﹤0.01% |
3,243
-4,581
| -59% | -$286K |
|
|
BWIN
4514
PUT
Baldwin Insurance Group
BWIN
$2.75B
| $167K | ﹤0.01% |
+7,600
| New | +$164K |
|
4515
CALL
Baytex Energy
BTE
$2.96B
| $167K | ﹤0.01% |
37,300
-51,800
| -58% | -$191K |
|
4516
PUT
United Natural Foods
UNFI
$3.04B
| $167K | ﹤0.01% |
3,700
+400
| +12% | +$15.3K |
|
4517
PUT
Aptiv
APTV
$12.3B
| $167K | ﹤0.01% |
2,400
-30,900
| -93% | -$2.38M |
|
|
GRRR
4518
CALL
Gorilla Technology Group
GRRR
$296M
| $166K | ﹤0.01% |
+15,800
| New | +$193K |
|
4519
BlueLinx
BXC
$430M
| $166K | ﹤0.01% |
3,069
-7,764
| -72% | -$510K |
|
|
VLD
4520
CALL
DELISTED
Velo3D, Inc.
VLD
| $166K | ﹤0.01% |
+17,700
| New | +$166K |
|
4521
PUT
Mueller Industries
MLI
$14.5B
| $166K | ﹤0.01% |
3,000
-1,200
| -29% | -$72K |
|
4522
PUT
Dakota Gold
DC
$617M
| $166K | ﹤0.01% |
32,900
+29,500
| +868% | +$175K |
|
|
VOYG
4523
PUT
Voyager Technologies
VOYG
$1.34B
| $166K | ﹤0.01% |
7,100
-14,100
| -67% | -$405K |
|
4524
Olema Pharmaceuticals
OLMA
$977M
| $166K | ﹤0.01% |
11,127
+5,806
| +109% | +$129K |
|
4525
CALL
Fortive
FTV
$18.2B
| $166K | ﹤0.01% |
3,000
-400
| -12% | -$22.4K |
|
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.