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 | |
|---|---|---|---|---|---|---|
2676
Bionano Genomics
BNGO
$12.7M
| $1.37M | ﹤0.01% |
311
-103
| -25% | -$407K |
|
2677
PUT
Itaú Unibanco
ITUB
$91.3B
| $1.37M | ﹤0.01% |
312,797
+307,972
| +6,383% | +$1.24M |
|
|
VG
2678
CALL
DELISTED
Vonage Holdings Corporation
VG
| $1.37M | ﹤0.01% |
+94,900
| New | +$1.3M |
|
2679
CALL
Haemonetics
HAE
$3.58B
| $1.37M | ﹤0.01% |
20,500
+20,498
| +1,024,900% | +$1.45M |
|
2680
CALL
Motorola Solutions
MSI
$69.4B
| $1.37M | ﹤0.01% |
6,300
+6,101
| +3,066% | +$1.22M |
|
2681
CALL
Wabtec
WAB
$51.1B
| $1.37M | ﹤0.01% |
16,600
+16,366
| +6,994% | +$1.33M |
|
|
SUM
2682
PUT
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $1.37M | ﹤0.01% |
+39,866
| New | +$1.26M |
|
2683
PUT
SSR Mining
SSRM
$5.57B
| $1.36M | ﹤0.01% |
87,600
+87,080
| +16,746% | +$1.46M |
|
2684
CALL
Leidos
LDOS
$14.1B
| $1.36M | ﹤0.01% |
13,500
+13,326
| +7,659% | +$1.37M |
|
2685
CALL
Rocket Pharmaceuticals
RCKT
$348M
| $1.36M | ﹤0.01% |
30,800
+30,633
| +18,343% | +$1.33M |
|
2686
PUT
DNOW Inc
DNOW
$2.63B
| $1.36M | ﹤0.01% |
143,700
+143,584
| +123,779% | +$1.48M |
|
2687
CALL
Pitney Bowes
PBI
$2.42B
| $1.36M | ﹤0.01% |
155,500
+154,063
| +10,721% | +$1.28M |
|
2688
CALL
Upwork
UPWK
$1.09B
| $1.36M | ﹤0.01% |
23,400
+23,186
| +10,835% | +$1.09M |
|
2689
PUT
Acadia Healthcare
ACHC
$3.17B
| $1.36M | ﹤0.01% |
21,700
+20,933
| +2,729% | +$1.31M |
|
2690
Mirion Technologies
MIR
$4.05B
| $1.36M | ﹤0.01% |
130,711
-284,582
| -69% | -$2.93M |
|
2691
PUT
Saic
SAIC
$5.03B
| $1.36M | ﹤0.01% |
15,500
+15,479
| +73,710% | +$1.38M |
|
2692
CALL
Cardlytics
CDLX
$21M
| $1.36M | ﹤0.01% |
1,070
+1,056
| +7,543% | +$1.19M |
|
2693
MarketAxess Holdings
MKTX
$4.15B
| $1.36M | ﹤0.01% |
2,929
+781
| +36% | +$372K |
|
2694
Alto Ingredients
ALTO
$360M
| $1.35M | ﹤0.01% |
221,513
+103,216
| +87% | +$601K |
|
2695
CALL
MKS Inc
MKSI
$22.2B
| $1.35M | ﹤0.01% |
7,600
+7,578
| +34,445% | +$1.38M |
|
|
TDAY
2696
CALL
USA Today Co
TDAY
$1.23B
| $1.35M | ﹤0.01% |
+246,200
| New | +$1.26M |
|
2697
CALL
Companhia Siderúrgica Nacional
SID
$1.43B
| $1.35M | ﹤0.01% |
153,900
+153,436
| +33,068% | +$1.33M |
|
|
CTLT
2698
PUT
DELISTED
CATALENT, INC.
CTLT
| $1.35M | ﹤0.01% |
12,500
+12,265
| +5,219% | +$1.31M |
|
|
COHR
2699
PUT
DELISTED
Coherent Inc
COHR
| $1.35M | ﹤0.01% |
5,100
+5,089
| +46,264% | +$1.34M |
|
|
LAC
2700
PUT
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $1.35M | ﹤0.01% |
90,900
+89,426
| +6,067% | +$1.28M |
|
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.