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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7301
CALL
Kiniksa Pharmaceuticals
KNSA
$6.19B
| $13K | ﹤0.01% |
1,300
-200
| -13% | -$2.63K |
|
7302
PUT
Liquidity Services
LQDT
$1.21B
| $13K | ﹤0.01% |
+1,000
| New | +$13.6K |
|
7303
PUT
Lantronix
LTRX
$228M
| $13K | ﹤0.01% |
+3,100
| New | +$14.5K |
|
7304
PUT
Merchants Bancorp
MBIN
$2.57B
| $13K | ﹤0.01% |
+500
| New | +$13.9K |
|
7305
CALL
Mine Safety
MSA
$6.76B
| $13K | ﹤0.01% |
100
| – | – |
|
7306
PUT
N-able
NABL
$835M
| $13K | ﹤0.01% |
+1,000
| New | +$11.1K |
|
7307
PUT
NBT Bancorp
NBTB
$2.82B
| $13K | ﹤0.01% |
+400
| New | +$15.7K |
|
|
NCTY
7308
CALL
The9 Ltd
NCTY
$68.1M
| $13K | ﹤0.01% |
1,710
-1,990
| -54% | -$20.9K |
|
7309
Ranpak Holdings
PACK
$510M
| $13K | ﹤0.01% |
2,674
-3,146
| -54% | -$20K |
|
7310
CALL
Phunware
PHUN
$42.7M
| $13K | ﹤0.01% |
368
+296
| +411% | +$13.7K |
|
7311
Pinterest
PINS
$13.5B
| $13K | ﹤0.01% |
500
| – | – |
|
7312
PUT
POSCO
PKX
$15B
| $13K | ﹤0.01% |
200
-100
| -33% | -$6.16K |
|
|
HTT
7313
PUT
High Templar Tech Ltd
HTT
$376M
| $13K | ﹤0.01% |
11,200
-800
| -7% | -$943 |
|
7314
CALL
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.36B
| $13K | ﹤0.01% |
100
-200
| -67% | -$24K |
|
7315
PUT
Runway Growth Finance
RWAY
$236M
| $13K | ﹤0.01% |
1,100
-8,200
| -88% | -$103K |
|
7316
PUT
Rackspace Technology
RXT
$957M
| $13K | ﹤0.01% |
7,100
+100
| +1% | +$257 |
|
7317
Saratoga Investment
SAR
$311M
| $13K | ﹤0.01% |
548
+522
| +2,008% | +$13.8K |
|
7318
PUT
Sinclair Inc
SBGI
$1.03B
| $13K | ﹤0.01% |
800
+100
| +14% | +$1.74K |
|
|
SHCO
7319
PUT
DELISTED
Soho House & Co
SHCO
| $13K | ﹤0.01% |
2,100
-25,800
| -92% | -$153K |
|
7320
PUT
SunCoke Energy
SXC
$749M
| $13K | ﹤0.01% |
+1,500
| New | +$13.7K |
|
7321
Telephone and Data Systems
TDS
$3.84B
| $13K | ﹤0.01% |
1,260
-20,780
| -94% | -$242K |
|
7322
PUT
TE Connectivity
TEL
$61.3B
| $13K | ﹤0.01% |
100
-54,400
| -100% | -$6.88M |
|
7323
PUT
TriMas Corp
TRS
$1.42B
| $13K | ﹤0.01% |
500
+200
| +67% | +$5.87K |
|
|
FLZH
7324
PUT
Flash Sports & Media Holdings
FLZH
$74.4M
| $13K | ﹤0.01% |
+204
| New | +$17.3K |
|
|
UMH
7325
CALL
UMH Properties
UMH
$1.34B
| $13K | ﹤0.01% |
900
+100
| +13% | +$1.64K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.