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 | |
|---|---|---|---|---|---|---|
|
POLY
2701
CALL
DELISTED
Plantronics, Inc.
POLY
| $1.35M | ﹤0.01% |
32,300
+32,274
| +124,131% | +$1.21M |
|
2702
PUT
iRhythm Holdings
IRTC
$3.59B
| $1.35M | ﹤0.01% |
20,300
+20,286
| +144,900% | +$1.61M |
|
2703
CALL
Xos
XOS
$27.7M
| $1.35M | ﹤0.01% |
4,517
+4,499
| +24,994% | +$1.34M |
|
|
GRMN
2704
PUT
Garmin
GRMN
$46.9B
| $1.34M | ﹤0.01% |
9,300
+9,068
| +3,909% | +$1.27M |
|
2705
CALL
Coeur Mining
CDE
$15.6B
| $1.34M | ﹤0.01% |
+151,400
| New | +$1.46M |
|
2706
Viasat
VSAT
$9.79B
| $1.34M | ﹤0.01% |
26,952
-1,916
| -7% | -$95.2K |
|
2707
PUT
Range Resources
RRC
$9.11B
| $1.34M | ﹤0.01% |
80,100
+79,471
| +12,634% | +$997K |
|
2708
iShares MSCI Europe Financials ETF
EUFN
$3.87B
| $1.34M | ﹤0.01% |
68,616
+42,448
| +162% | +$861K |
|
2709
PUT
Levi Strauss
LEVI
$9.44B
| $1.34M | ﹤0.01% |
48,400
+48,370
| +161,233% | +$1.33M |
|
2710
PUT
Peabody Energy
BTU
$2.78B
| $1.34M | ﹤0.01% |
168,800
+167,206
| +10,490% | +$990K |
|
2711
Envista
NVST
$4.28B
| $1.33M | ﹤0.01% |
30,853
+30,750
| +29,854% | +$1.33M |
|
|
IS
2712
DELISTED
ironSource Ltd.
IS
| $1.33M | ﹤0.01% |
+126,961
| New | +$1.36M |
|
2713
CALL
Matador Resources
MTDR
$6.31B
| $1.33M | ﹤0.01% |
37,000
+35,954
| +3,437% | +$1.05M |
|
|
RADA
2714
CALL
DELISTED
Rada Electronic Industries Ltd
RADA
| $1.33M | ﹤0.01% |
109,400
+107,575
| +5,895% | +$1.32M |
|
|
ROIC
2715
CALL
DELISTED
Retail Opportunity Investments Corp.
ROIC
| $1.33M | ﹤0.01% |
75,400
+73,793
| +4,592% | +$1.3M |
|
2716
CALL
nCino
NCNO
$1.81B
| $1.33M | ﹤0.01% |
22,200
+22,033
| +13,193% | +$1.39M |
|
2717
CALL
Parsons
PSN
$6.28B
| $1.33M | ﹤0.01% |
33,800
+33,312
| +6,826% | +$1.37M |
|
2718
CALL
Xcel Energy
XEL
$51B
| $1.33M | ﹤0.01% |
20,200
+19,480
| +2,706% | +$1.36M |
|
2719
BioMarin Pharmaceuticals
BMRN
$11.5B
| $1.33M | ﹤0.01% |
15,928
-6,596
| -29% | -$523K |
|
2720
CALL
Royalty Pharma
RPRX
$26.1B
| $1.33M | ﹤0.01% |
32,400
+32,019
| +8,404% | +$1.36M |
|
2721
ARK Web x.0 ETF
ARKW
$1.64B
| $1.33M | ﹤0.01% |
8,614
-6,412
| -43% | -$920K |
|
2722
CALL
Howmet Aerospace
HWM
$116B
| $1.33M | ﹤0.01% |
38,600
+38,381
| +17,526% | +$1.28M |
|
2723
CALL
LyondellBasell Industries
LYB
$19.5B
| $1.33M | ﹤0.01% |
12,900
+12,406
| +2,511% | +$1.34M |
|
|
WBT
2724
CALL
DELISTED
Welbilt, Inc.
WBT
| $1.33M | ﹤0.01% |
57,300
+56,402
| +6,281% | +$1.2M |
|
|
PSTH
2725
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $1.33M | ﹤0.01% |
58,296
-20,143
| -26% | -$484K |
|
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.