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 | |
|---|---|---|---|---|---|---|
2651
Sibanye-Stillwater
SBSW
$5.92B
| $1.4M | ﹤0.01% |
83,589
-4,915
| -6% | -$91.2K |
|
|
PFPT
2652
DELISTED
Proofpoint, Inc.
PFPT
| $1.4M | ﹤0.01% |
+8,047
| New | +$1.31M |
|
2653
CALL
GDS Holdings
GDS
$6.34B
| $1.4M | ﹤0.01% |
17,800
+17,631
| +10,433% | +$1.37M |
|
2654
HSBC
HSBC
$355B
| $1.4M | ﹤0.01% |
48,457
+23,301
| +93% | +$712K |
|
2655
CALL
Penumbra
PEN
$12.5B
| $1.4M | ﹤0.01% |
5,100
+5,041
| +8,544% | +$1.38M |
|
2656
CALL
Expeditors International
EXPD
$22.9B
| $1.39M | ﹤0.01% |
+11,000
| New | +$1.3M |
|
2657
Darling Ingredients
DAR
$9.93B
| $1.39M | ﹤0.01% |
+20,616
| New | +$1.45M |
|
|
RADA
2658
DELISTED
Rada Electronic Industries Ltd
RADA
| $1.39M | ﹤0.01% |
114,237
+29,442
| +35% | +$362K |
|
2659
iShares MSCI China ETF
MCHI
$6.04B
| $1.39M | ﹤0.01% |
+16,860
| New | +$1.37M |
|
|
XIFR
2660
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $1.39M | ﹤0.01% |
18,200
+18,074
| +14,344% | +$1.29M |
|
2661
PUT
Ares Capital
ARCC
$13.5B
| $1.39M | ﹤0.01% |
70,800
+70,144
| +10,693% | +$1.36M |
|
2662
PUT
American Outdoor Brands
AOUT
$162M
| $1.38M | ﹤0.01% |
+39,400
| New | +$1.16M |
|
|
NTR
2663
CALL
DELISTED
NEW YORK MORTGAGE TRUST INC
NTR
| $1.38M | ﹤0.01% |
309,300
+306,824
| +12,392% | +$1.37M |
|
2664
CALL
TMC The Metals Company
TMC
$1.59B
| $1.38M | ﹤0.01% |
138,800
+135,643
| +4,297% | +$1.35M |
|
2665
CALL
Kornit Digital
KRNT
$706M
| $1.38M | ﹤0.01% |
11,100
+11,096
| +277,400% | +$1.17M |
|
2666
Howmet Aerospace
HWM
$116B
| $1.38M | ﹤0.01% |
39,896
+24,292
| +156% | +$810K |
|
2667
Regeneron Pharmaceuticals
REGN
$68.8B
| $1.38M | ﹤0.01% |
+2,463
| New | +$1.25M |
|
2668
Gartner
IT
$9.41B
| $1.37M | ﹤0.01% |
5,673
+5,446
| +2,399% | +$1.19M |
|
|
GPMT
2669
CALL
Granite Point Mortgage Trust
GPMT
$63.7M
| $1.37M | ﹤0.01% |
93,100
+92,646
| +20,407% | +$1.28M |
|
2670
CALL
The RealReal
REAL
$1.34B
| $1.37M | ﹤0.01% |
69,500
+69,284
| +32,076% | +$1.42M |
|
2671
CALL
CubeSmart
CUBE
$9.53B
| $1.37M | ﹤0.01% |
29,600
+29,596
| +739,900% | +$1.28M |
|
2672
PUT
Lindblad Expeditions
LIND
$1.76B
| $1.37M | ﹤0.01% |
85,600
+84,681
| +9,214% | +$1.43M |
|
2673
Rapid7
RPD
$634M
| $1.37M | ﹤0.01% |
14,470
+3,417
| +31% | +$288K |
|
|
UNVR
2674
DELISTED
Univar Solutions Inc.
UNVR
| $1.37M | ﹤0.01% |
56,149
+27,922
| +99% | +$699K |
|
|
ARVL
2675
DELISTED
Arrival Ordinary Shares
ARVL
| $1.37M | ﹤0.01% |
1,747
+1,710
| +4,622% | +$1.51M |
|
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.