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 |
Microsoft
MSFT
|
+$114M |
| 2 |
NVIDIA
NVDA
|
+$85.9M |
| 3 |
Citigroup
C
|
+$61.5M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$45.5M |
| 5 |
Pfizer
PFE
|
+$41.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$467M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
+$71.2M |
| 3 |
Meta Platforms (Facebook)
META
|
+$47.6M |
| 4 |
Intel
INTC
|
+$41.9M |
| 5 |
TSMC
TSM
|
+$35.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.51% |
| 2 | Financials | 0.35% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Healthcare | 0.25% |
| 5 | Industrials | 0.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
PUT
DigitalBridge
DBRG
$2.94B
| $1.9M | ﹤0.01% |
151,900
+116,425
| +328% | +$2.24M |
|
|
EXAS
2002
PUT
DELISTED
Exact Sciences
EXAS
| $1.9M | ﹤0.01% |
58,500
+47,400
| +427% | +$1.95M |
|
|
THCA
2003
CALL
DELISTED
Tuscan Holdings Corp. II Common Stock
THCA
| $1.9M | ﹤0.01% |
182,800
-7,600
| -4% | -$78.8K |
|
2004
PUT
PVH
PVH
$3.71B
| $1.9M | ﹤0.01% |
42,300
+12,500
| +42% | +$742K |
|
2005
Dell
DELL
$283B
| $1.89M | ﹤0.01% |
+55,414
| New | +$2.33M |
|
2006
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $1.89M | ﹤0.01% |
42,800
+18,400
| +75% | +$775K |
|
2007
CALL
Organon & Co
OGN
$3.55B
| $1.89M | ﹤0.01% |
80,800
+21,400
| +36% | +$646K |
|
2008
PUT
Delek US
DK
$3.87B
| $1.89M | ﹤0.01% |
69,600
+59,600
| +596% | +$1.57M |
|
|
AXON
2009
CALL
Axon Enterprise
AXON
$40.5B
| $1.89M | ﹤0.01% |
16,300
-6,600
| -29% | -$748K |
|
2010
PUT
Guidewire Software
GWRE
$11.5B
| $1.88M | ﹤0.01% |
30,600
+8,500
| +38% | +$614K |
|
2011
Qiagen
QGEN
$8.53B
| $1.88M | ﹤0.01% |
+43,045
| New | +$2.13M |
|
|
SJT
2012
CALL
San Juan Basin Royalty Trust
SJT
$117M
| $1.88M | ﹤0.01% |
200,200
-1,500
| -0.7% | -$17.6K |
|
2013
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $1.88M | ﹤0.01% |
17,700
+9,600
| +119% | +$974K |
|
2014
CALL
Illinois Tool Works
ITW
$81.4B
| $1.88M | ﹤0.01% |
10,400
-4,500
| -30% | -$888K |
|
|
NEWR
2015
CALL
DELISTED
New Relic, Inc.
NEWR
| $1.88M | ﹤0.01% |
32,700
-33,300
| -50% | -$2M |
|
|
AZUL
2016
PUT
DELISTED
Azul
AZUL
| $1.88M | ﹤0.01% |
230,400
+53,300
| +30% | +$449K |
|
2017
PUT
Fiverr
FVRR
$376M
| $1.88M | ﹤0.01% |
61,300
+31,800
| +108% | +$1.13M |
|
2018
CALL
GDS Holdings
GDS
$6.34B
| $1.88M | ﹤0.01% |
106,200
+7,400
| +7% | +$194K |
|
2019
CALL
Kornit Digital
KRNT
$706M
| $1.87M | ﹤0.01% |
70,400
+68,800
| +4,300% | +$1.98M |
|
2020
CALL
Yelp
YELP
$1.38B
| $1.87M | ﹤0.01% |
55,200
+41,500
| +303% | +$1.37M |
|
2021
CALL
Main Street Capital
MAIN
$4.97B
| $1.87M | ﹤0.01% |
55,600
-4,100
| -7% | -$169K |
|
2022
CALL
Lattice Semiconductor
LSCC
$17.6B
| $1.86M | ﹤0.01% |
37,900
+21,600
| +133% | +$1.2M |
|
|
UDMY
2023
PUT
DELISTED
Udemy
UDMY
| $1.86M | ﹤0.01% |
154,200
+150,800
| +4,435% | +$2.01M |
|
2024
Lincoln National
LNC
$7.91B
| $1.86M | ﹤0.01% |
+42,415
| New | +$2.04M |
|
2025
Enphase Energy
ENPH
$4.84B
| $1.86M | ﹤0.01% |
+6,706
| New | +$1.81M |
|
Similar funds
Simplex Trading's Q3 2022 Portfolio in Review
As of Q3 2022, Simplex Trading held 11,570 positions worth $88.5B, down 6% from $94.1B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading's Q3 2022 filing shows 1,564 new, 4,281 increased, 3,851 reduced and 1,575 closed positions. Its largest new stake was Microsoft: 432,062 shares worth $101M. The largest sale was Apple, an estimated $467M.
By sector, the portfolio is most concentrated in Technology at 0.51% of assets, down from 0.84% a quarter earlier, followed by Financials and Consumer Discretionary.
- Simplex Trading's largest Q3 2022 buy was Microsoft: 432,062 shares worth $101M.
- Simplex Trading added most to NVIDIA in Q3 2022, an estimated $85.9M increase.
- Simplex Trading's biggest Q3 2022 reduction was Apple, cutting an estimated $467M.
- Simplex Trading fully exited iShares Core S&P 500 ETF in Q3 2022, selling an estimated $34.3M.
- Simplex Trading's ten largest holdings make up 38% of its $88.5B portfolio in Q3 2022.
- Simplex Trading opened 1,564 new positions and closed 1,575 in Q3 2022.
- Simplex Trading's portfolio value fell 6% quarter-over-quarter to $88.5B.
Based on Simplex Trading's 13F filing for Q3 2022, filed 4 Nov 2022.