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 | |
|---|---|---|---|---|---|---|
3501
CALL
Inseego
INSG
$114M
| $778K | ﹤0.01% |
+7,720
| New | +$706K |
|
3502
CALL
Organon & Co
OGN
$3.56B
| $777K | ﹤0.01% |
+25,700
| New | +$846K |
|
3503
ProShares Ultra Technology
ROM
$1.11B
| $776K | ﹤0.01% |
16,118
-3,686
| -19% | -$157K |
|
3504
PUT
Antero Midstream
AM
$10.4B
| $775K | ﹤0.01% |
74,600
+74,083
| +14,329% | +$707K |
|
3505
CALL
Xerox
XRX
$357M
| $775K | ﹤0.01% |
+33,000
| New | +$798K |
|
3506
CALL
Kinsale Capital Group
KNSL
$8.24B
| $774K | ﹤0.01% |
4,700
+4,670
| +15,567% | +$771K |
|
|
MAG
3507
DELISTED
MAG Silver
MAG
| $774K | ﹤0.01% |
37,001
-3,904
| -10% | -$77.3K |
|
3508
Eastman Chemical
EMN
$7.74B
| $772K | ﹤0.01% |
6,619
+3,100
| +88% | +$372K |
|
3509
PUT
Wingstop
WING
$3.74B
| $772K | ﹤0.01% |
+4,900
| New | +$706K |
|
3510
CALL
Prothena Corp
PRTA
$455M
| $771K | ﹤0.01% |
15,000
+14,963
| +40,441% | +$467K |
|
|
CHS
3511
CALL
DELISTED
Chicos FAS, Inc.
CHS
| $771K | ﹤0.01% |
117,300
+114,310
| +3,823% | +$493K |
|
3512
AeroVironment
AVAV
$7.81B
| $770K | ﹤0.01% |
+7,692
| New | +$847K |
|
|
DSL
3513
PUT
DoubleLine Income Solutions Fund
DSL
$1.23B
| $770K | ﹤0.01% |
42,600
+42,522
| +54,515% | +$771K |
|
3514
Logitech
LOGI
$15.5B
| $770K | ﹤0.01% |
6,371
-5,324
| -46% | -$623K |
|
3515
PUT
Coeur Mining
CDE
$15.8B
| $769K | ﹤0.01% |
+86,700
| New | +$836K |
|
3516
Estee Lauder
EL
$30.1B
| $769K | ﹤0.01% |
+2,420
| New | +$734K |
|
3517
CALL
Uranium Energy
UEC
$4.9B
| $769K | ﹤0.01% |
289,100
+288,758
| +84,432% | +$869K |
|
3518
PUT
Alliance Resource Partners
ARLP
$3.3B
| $768K | ﹤0.01% |
106,600
+106,245
| +29,928% | +$666K |
|
|
PR
3519
Permian Resources
PR
$17B
| $768K | ﹤0.01% |
113,294
+32,127
| +40% | +$166K |
|
|
FLG
3520
CALL
Flagstar Bank National Association
FLG
$5.74B
| $768K | ﹤0.01% |
23,233
+23,099
| +17,238% | +$826K |
|
3521
CALL
Agios Pharmaceuticals
AGIO
$2.2B
| $766K | ﹤0.01% |
13,900
+13,711
| +7,254% | +$767K |
|
3522
PUT
FS KKR Capital
FSK
$3.04B
| $766K | ﹤0.01% |
35,686
+35,561
| +28,449% | +$762K |
|
3523
CALL
Patrick Industries
PATK
$2.81B
| $766K | ﹤0.01% |
+15,750
| New | +$901K |
|
|
LSI
3524
DELISTED
Life Storage, Inc.
LSI
| $766K | ﹤0.01% |
7,136
-7,525
| -51% | -$740K |
|
3525
CALL
eHealth
EHTH
$43.2M
| $765K | ﹤0.01% |
13,100
+12,737
| +3,509% | +$837K |
|
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.