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 | |
|---|---|---|---|---|---|---|
|
MOMO
1726
CALL
Hello Group
MOMO
$869M
| $2.87M | ﹤0.01% |
187,300
+184,367
| +6,286% | +$2.71M |
|
1727
CALL
XPEL
XPEL
$1.18B
| $2.86M | ﹤0.01% |
34,100
+34,059
| +83,071% | +$2.51M |
|
|
BNY
1728
CALL
Bank of New York Mellon
BNY
$108B
| $2.86M | ﹤0.01% |
+55,800
| New | +$2.79M |
|
|
FMAC
1729
CALL
DELISTED
FirstMark Horizon Acquisition Corp.
FMAC
| $2.86M | ﹤0.01% |
287,900
+287,635
| +108,542% | +$2.86M |
|
1730
Microvast
MVST
$267M
| $2.86M | ﹤0.01% |
209,614
+163,084
| +350% | +$1.93M |
|
|
HZNP
1731
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $2.86M | ﹤0.01% |
+30,500
| New | +$2.81M |
|
1732
PUT
Cooper Companies
COO
$13.7B
| $2.85M | ﹤0.01% |
28,800
+28,752
| +59,900% | +$2.82M |
|
1733
PUT
Canadian Natural Resources
CNQ
$96.9B
| $2.85M | ﹤0.01% |
+160,297
| New | +$2.64M |
|
1734
CALL
WIX.com
WIX
$2.15B
| $2.84M | ﹤0.01% |
9,800
+9,487
| +3,031% | +$2.66M |
|
|
GBIO
1735
PUT
DELISTED
Generation Bio
GBIO
| $2.84M | ﹤0.01% |
10,560
+10,473
| +12,038% | +$3.13M |
|
1736
HubSpot
HUBS
$10.5B
| $2.83M | ﹤0.01% |
4,866
+2,721
| +127% | +$1.42M |
|
1737
PUT
Baxter International
BAX
$11.6B
| $2.83M | ﹤0.01% |
+35,200
| New | +$2.95M |
|
1738
CALL
Yeti Holdings
YETI
$3.82B
| $2.83M | ﹤0.01% |
30,800
+30,415
| +7,900% | +$2.64M |
|
1739
Tractor Supply
TSCO
$16.3B
| $2.82M | ﹤0.01% |
+75,880
| New | +$2.78M |
|
1740
PUT
RLX Technology
RLX
$2.48B
| $2.82M | ﹤0.01% |
323,200
+320,982
| +14,472% | +$3.28M |
|
|
CTLT
1741
CALL
DELISTED
CATALENT, INC.
CTLT
| $2.82M | ﹤0.01% |
26,100
+25,924
| +14,730% | +$2.78M |
|
1742
CALL
Vulcan Materials
VMC
$36.3B
| $2.82M | ﹤0.01% |
16,200
+16,019
| +8,850% | +$2.86M |
|
1743
iShares MSCI Emerging Markets ETF
EEM
$28B
| $2.82M | ﹤0.01% |
51,112
+15,768
| +45% | +$857K |
|
1744
PUT
Nutrien
NTR
$32.7B
| $2.82M | ﹤0.01% |
46,500
+45,921
| +7,931% | +$2.72M |
|
1745
General Motors
GM
$74.7B
| $2.81M | ﹤0.01% |
47,587
-109,941
| -70% | -$6.46M |
|
1746
PUT
Vodafone
VOD
$34.9B
| $2.81M | ﹤0.01% |
164,300
+162,473
| +8,893% | +$3.04M |
|
1747
PUT
Sprouts Farmers Market
SFM
$7.04B
| $2.81M | ﹤0.01% |
+113,200
| New | +$3.02M |
|
1748
PUT
Sturm, Ruger & Co
RGR
$610M
| $2.81M | ﹤0.01% |
31,200
+31,105
| +32,742% | +$2.33M |
|
1749
PUT
Celanese
CE
$5.09B
| $2.8M | ﹤0.01% |
18,500
+18,222
| +6,555% | +$2.89M |
|
1750
CALL
Dynatrace
DT
$12.1B
| $2.8M | ﹤0.01% |
48,000
+47,433
| +8,366% | +$2.48M |
|
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.