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 | |
|---|---|---|---|---|---|---|
|
ENDP
5976
CALL
DELISTED
Endo International plc
ENDP
| $168K | ﹤0.01% |
+36,000
| New | +$206K |
|
|
PTE
5977
CALL
DELISTED
PolarityTE, Inc. Common Stock
PTE
| $168K | ﹤0.01% |
6,608
+6,586
| +29,936% | +$173K |
|
5978
CALL
Aviat Networks
AVNW
$265M
| $167K | ﹤0.01% |
+5,100
| New | +$178K |
|
5979
PUT
American States Water
AWR
$3.36B
| $167K | ﹤0.01% |
2,100
+2,043
| +3,584% | +$162K |
|
5980
Chefs' Warehouse
CHEF
$4.71B
| $167K | ﹤0.01% |
+5,261
| New | +$168K |
|
5981
CALL
OraSure Technologies
OSUR
$279M
| $167K | ﹤0.01% |
+16,500
| New | +$160K |
|
5982
Phreesia
PHR
$663M
| $167K | ﹤0.01% |
+2,727
| New | +$142K |
|
5983
CALL
SEI Investments
SEIC
$12.4B
| $167K | ﹤0.01% |
2,700
+2,685
| +17,900% | +$167K |
|
5984
CALL
STAAR Surgical
STAA
$1.21B
| $167K | ﹤0.01% |
1,100
+1,068
| +3,338% | +$141K |
|
|
QIWI
5985
DELISTED
QIWI PLC
QIWI
| $167K | ﹤0.01% |
15,744
-14,577
| -48% | -$157K |
|
5986
Cathay General Bancorp
CATY
$4.22B
| $166K | ﹤0.01% |
4,236
+4,063
| +2,349% | +$167K |
|
5987
CALL
CenterPoint Energy
CNP
$27.7B
| $166K | ﹤0.01% |
6,800
+6,491
| +2,101% | +$159K |
|
5988
Culp Inc
CULP
$44.1M
| $166K | ﹤0.01% |
10,204
+6,162
| +152% | +$95.3K |
|
|
PLG
5989
CALL
Platinum Group Metals
PLG
$164M
| $166K | ﹤0.01% |
46,000
+45,340
| +6,870% | +$194K |
|
5990
Varonis Systems
VRNS
$4.59B
| $166K | ﹤0.01% |
2,892
-11,962
| -81% | -$623K |
|
|
NM
5991
PUT
DELISTED
Navios Maritime Holdings Inc.
NM
| $166K | ﹤0.01% |
+18,200
| New | +$158K |
|
|
MTOR
5992
PUT
DELISTED
MERITOR, Inc.
MTOR
| $166K | ﹤0.01% |
7,100
+7,096
| +177,400% | +$186K |
|
|
SYKE
5993
CALL
DELISTED
SYKES Enterprises Inc
SYKE
| $166K | ﹤0.01% |
3,100
+3,059
| +7,461% | +$136K |
|
|
BRFS
5994
PUT
DELISTED
BRF SA
BRFS
| $165K | ﹤0.01% |
+30,300
| New | +$144K |
|
5995
Direxion Daily MSCI India Bull 2X ETF
INDL
$57.2M
| $165K | ﹤0.01% |
3,225
-19,377
| -86% | -$939K |
|
5996
MannKind Corp
MNKD
$1.21B
| $165K | ﹤0.01% |
30,309
-202,903
| -87% | -$879K |
|
5997
PUT
Republic Services
RSG
$64.8B
| $165K | ﹤0.01% |
1,500
+1,460
| +3,650% | +$157K |
|
5998
CALL
WaFd
WAFD
$2.72B
| $165K | ﹤0.01% |
5,200
+5,145
| +9,355% | +$168K |
|
|
AUD
5999
CALL
DELISTED
Audacy, Inc.
AUD
| $165K | ﹤0.01% |
38,300
+37,624
| +5,566% | +$173K |
|
|
CALA
6000
CALL
DELISTED
Calithera Biosciences, Inc
CALA
| $165K | ﹤0.01% |
3,965
+3,931
| +11,562% | +$173K |
|
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.