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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3876
CALL
Credit Acceptance
CACC
$5.82B
| $360K | ﹤0.01% |
+10
| New | +$3.63K |
|
|
CARM
3877
DELISTED
Carisma Therapeutics
CARM
| $360K | ﹤0.01% |
6,934
+4,539
| +190% | +$214K |
|
3878
CALL
KBR
KBR
$4.56B
| $360K | ﹤0.01% |
94
+24
| +34% | +$765 |
|
3879
Xenon Pharmaceuticals
XENE
$6.1B
| $360K | ﹤0.01% |
+20,142
| New | +$341K |
|
|
LFC
3880
CALL
DELISTED
China Life Insurance Company Ltd.
LFC
| $360K | ﹤0.01% |
346
+345
| +34,500% | +$3.73K |
|
|
EXK
3881
Endeavour Silver
EXK
$2.24B
| $359K | ﹤0.01% |
72,488
+51,636
| +248% | +$277K |
|
3882
Matsons
MATX
$6.11B
| $359K | ﹤0.01% |
5,396
+3,771
| +232% | +$258K |
|
3883
Methanex
MEOH
$4.23B
| $359K | ﹤0.01% |
9,764
+5,097
| +109% | +$199K |
|
3884
PUT
Nomad Foods
NOMD
$1.77B
| $359K | ﹤0.01% |
131
+105
| +404% | +$2.72K |
|
3885
CALL
Robert Half
RHI
$4.11B
| $359K | ﹤0.01% |
46
-248
| -84% | -$18K |
|
|
AXNX
3886
CALL
DELISTED
Axonics, Inc. Common Stock
AXNX
| $359K | ﹤0.01% |
60
+54
| +900% | +$2.94K |
|
|
AIMC
3887
PUT
DELISTED
Altra Industrial Motion Corp
AIMC
| $359K | ﹤0.01% |
65
-47
| -42% | -$2.73K |
|
|
NPTN
3888
DELISTED
NEOPHOTONICS CORP
NPTN
| $359K | ﹤0.01% |
30,088
+9,453
| +46% | +$107K |
|
3889
PUT
Aqua Metals
AQMS
$9.78M
| $358K | ﹤0.01% |
4
+3
| +300% | +$2.9K |
|
3890
PUT
IPG Photonics
IPGP
$3.4B
| $358K | ﹤0.01% |
17
-29
| -63% | -$6.59K |
|
3891
PUT
VICI Properties
VICI
$29.9B
| $358K | ﹤0.01% |
127
+52
| +69% | +$1.41K |
|
|
AL
3892
PUT
DELISTED
Air Lease Corp
AL
| $357K | ﹤0.01% |
73
-3
| -4% | -$137 |
|
3893
PUT
Lloyds Banking Group
LYG
$85.2B
| $357K | ﹤0.01% |
1,541
+318
| +26% | +$660 |
|
|
ICPT
3894
CALL
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $357K | ﹤0.01% |
155
-833
| -84% | -$23.2K |
|
3895
CALL
LSB Industries
LXU
$824M
| $356K | ﹤0.01% |
902
+725
| +410% | +$2.32K |
|
3896
CALL
Sony
SONY
$137B
| $356K | ﹤0.01% |
6,485
-3,040
| -32% | -$64.2K |
|
|
TSE
3897
PUT
DELISTED
Trinseo
TSE
| $356K | ﹤0.01% |
56
+21
| +60% | +$1.28K |
|
3898
PUT
Aclaris Therapeutics
ACRS
$715M
| $355K | ﹤0.01% |
141
+136
| +2,720% | +$2.66K |
|
3899
CALL
Korro Bio
KRRO
$145M
| $355K | ﹤0.01% |
+7
| New | +$13.6K |
|
|
RC
3900
PUT
Ready Capital
RC
$260M
| $355K | ﹤0.01% |
265
+203
| +327% | +$2.63K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.