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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ME
4301
DELISTED
23andMe Holding Co
ME
| $458K | ﹤0.01% |
1,960
+1,760
| +880% | +$366K |
|
|
XONE
4302
DELISTED
The ExOne Company
XONE
| $458K | ﹤0.01% |
21,171
-33,087
| -61% | -$753K |
|
|
MDRX
4303
PUT
DELISTED
Veradigm Inc. Common Stock
MDRX
| $457K | ﹤0.01% |
+24,700
| New | +$416K |
|
4304
CALL
Coca-Cola Europacific Partners
CCEP
$48.9B
| $456K | ﹤0.01% |
+7,700
| New | +$449K |
|
4305
CALL
Monster Beverage
MNST
$96.5B
| $456K | ﹤0.01% |
+10,000
| New | +$469K |
|
|
WORK
4306
CALL
DELISTED
Slack Technologies, Inc.
WORK
| $456K | ﹤0.01% |
270,200
+266,867
| +8,007% | +$11.4M |
|
4307
Anavex Life Sciences
AVXL
$232M
| $455K | ﹤0.01% |
19,910
-5,253
| -21% | -$77.8K |
|
4308
KE Holdings
BEKE
$17.7B
| $455K | ﹤0.01% |
9,554
-28,126
| -75% | -$1.44M |
|
4309
CALL
O-I Glass
OI
$1.13B
| $455K | ﹤0.01% |
27,900
+27,535
| +7,544% | +$467K |
|
4310
PagerDuty
PD
$814M
| $455K | ﹤0.01% |
+10,699
| New | +$433K |
|
4311
CALL
Carpenter Technology
CRS
$26.8B
| $454K | ﹤0.01% |
11,300
+11,209
| +12,318% | +$473K |
|
4312
CALL
Verisk Analytics
VRSK
$29.1B
| $454K | ﹤0.01% |
2,600
+2,576
| +10,733% | +$457K |
|
|
DBD
4313
CALL
DELISTED
Diebold Nixdorf Incorporated
DBD
| $454K | ﹤0.01% |
35,400
+35,157
| +14,468% | +$482K |
|
4314
PUT
Ecolab
ECL
$79.2B
| $453K | ﹤0.01% |
2,200
+2,185
| +14,567% | +$475K |
|
4315
Fastenal
FAST
$54.5B
| $453K | ﹤0.01% |
17,438
-51,812
| -75% | -$1.35M |
|
4316
PUT
Global Partners
GLP
$1.67B
| $453K | ﹤0.01% |
17,500
+17,164
| +5,108% | +$421K |
|
4317
CALL
Healthcare Realty
HR
$7.57B
| $453K | ﹤0.01% |
17,000
+16,838
| +10,394% | +$476K |
|
|
NSTB
4318
CALL
DELISTED
Northern Star Investment Corp. II
NSTB
| $453K | ﹤0.01% |
+45,500
| New | +$454K |
|
4319
PUT
Innoviz Technologies
INVZ
$98.5M
| $452K | ﹤0.01% |
+42,800
| New | +$444K |
|
4320
CALL
Philips
PHG
$25.2B
| $452K | ﹤0.01% |
11,017
+10,654
| +2,935% | +$493K |
|
|
OPLN
4321
PUT
Openlane
OPLN
$4.32B
| $451K | ﹤0.01% |
+25,700
| New | +$435K |
|
4322
CALL
NeoGenomics
NEO
$2B
| $451K | ﹤0.01% |
+10,000
| New | +$443K |
|
4323
CALL
Concentrix
CNXC
$1.58B
| $450K | ﹤0.01% |
2,800
+2,796
| +69,900% | +$430K |
|
4324
PUT
iShares S&P GSCI Commodity-Indexed Trust
GSG
$995M
| $450K | ﹤0.01% |
28,000
+27,677
| +8,569% | +$422K |
|
|
CTXS
4325
DELISTED
Citrix Systems Inc
CTXS
| $450K | ﹤0.01% |
3,845
+246
| +7% | +$30.6K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.