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 | |
|---|---|---|---|---|---|---|
3876
AbCellera Biologics
ABCL
$1.62B
| $601K | ﹤0.01% |
27,322
+24,152
| +762% | +$666K |
|
3877
PUT
TMC The Metals Company
TMC
$1.56B
| $601K | ﹤0.01% |
60,500
+56,920
| +1,590% | +$565K |
|
|
VLRS
3878
CALL
Controladora Vuela Compania de Aviacion
VLRS
$910M
| $601K | ﹤0.01% |
31,300
+31,263
| +84,495% | +$532K |
|
3879
PUT
Alamos Gold
AGI
$12.1B
| $600K | ﹤0.01% |
78,500
+77,009
| +5,165% | +$657K |
|
3880
CALL
Cogent Communications
CCOI
$649M
| $599K | ﹤0.01% |
+7,800
| New | +$579K |
|
|
GTLS
3881
PUT
DELISTED
Chart Industries
GTLS
| $599K | ﹤0.01% |
+4,100
| New | +$601K |
|
3882
PUT
Carter's
CRI
$1.45B
| $598K | ﹤0.01% |
5,800
+5,731
| +8,306% | +$584K |
|
3883
PUT
Royalty Pharma
RPRX
$26.6B
| $598K | ﹤0.01% |
14,600
+14,549
| +28,527% | +$619K |
|
|
ABTC
3884
PUT
American Bitcoin Corp
ABTC
$400M
| $598K | ﹤0.01% |
+5
| New | +$625K |
|
3885
Xcel Energy
XEL
$50.1B
| $596K | ﹤0.01% |
9,052
+5,381
| +147% | +$375K |
|
|
DCH
3886
CALL
Dauch Corp
DCH
$1.33B
| $595K | ﹤0.01% |
57,500
+57,074
| +13,398% | +$600K |
|
|
CHX
3887
PUT
DELISTED
ChampionX
CHX
| $595K | ﹤0.01% |
23,200
+23,183
| +136,371% | +$564K |
|
3888
PUT
Katapult Holdings
KPLT
$31.9M
| $593K | ﹤0.01% |
2,196
+2,177
| +11,458% | +$676K |
|
|
SMAR
3889
CALL
DELISTED
Smartsheet Inc.
SMAR
| $593K | ﹤0.01% |
8,200
+7,985
| +3,714% | +$498K |
|
3890
PUT
MannKind Corp
MNKD
$1.21B
| $592K | ﹤0.01% |
+108,800
| New | +$471K |
|
3891
Roundhill Sports Betting & iGaming ETF
BETZ
$51.1M
| $591K | ﹤0.01% |
19,505
-29,880
| -61% | -$936K |
|
3892
PUT
Stride
LRN
$4.08B
| $591K | ﹤0.01% |
18,400
+18,321
| +23,191% | +$546K |
|
3893
Lincoln Electric
LECO
$14.6B
| $590K | ﹤0.01% |
+4,487
| New | +$575K |
|
3894
CALL
Xeris Biopharma Holdings
XERS
$1.42B
| $590K | ﹤0.01% |
145,100
+144,068
| +13,960% | +$550K |
|
3895
CEL-SCI Corp
CVM
$21M
| $589K | ﹤0.01% |
+2,265
| New | +$1.4M |
|
3896
CALL
Heron Therapeutics
HRTX
$92M
| $589K | ﹤0.01% |
38,000
+37,988
| +316,567% | +$604K |
|
3897
PUT
Kennametal
KMT
$2.71B
| $589K | ﹤0.01% |
16,400
+16,344
| +29,186% | +$640K |
|
|
SWCH
3898
PUT
DELISTED
Switch, Inc. Class A Common Stock
SWCH
| $588K | ﹤0.01% |
27,900
+27,603
| +9,294% | +$529K |
|
3899
PUT
GoPro
GPRO
$125M
| $587K | ﹤0.01% |
+50,400
| New | +$569K |
|
3900
Ironwood Pharmaceuticals
IRWD
$626M
| $587K | ﹤0.01% |
45,619
-18,318
| -29% | -$210K |
|
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.