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 | |
|---|---|---|---|---|---|---|
5451
Unum
UNM
$13.6B
| $231K | ﹤0.01% |
+8,153
| New | +$240K |
|
|
CBD
5452
DELISTED
Companhia Brasileira de Distribuicao
CBD
| $231K | ﹤0.01% |
29,710
-36,017
| -55% | -$258K |
|
|
INFI
5453
PUT
DELISTED
Infinity Pharmaceuticals, Inc.
INFI
| $231K | ﹤0.01% |
77,400
+76,204
| +6,372% | +$241K |
|
|
QIWI
5454
PUT
DELISTED
QIWI PLC
QIWI
| $231K | ﹤0.01% |
21,700
+21,326
| +5,702% | +$230K |
|
5455
CALL
EVgo
EVGO
$219M
| $230K | ﹤0.01% |
114,600
+113,400
| +9,450% | +$1.45M |
|
5456
PUT
Comstock
LODE
$208M
| $230K | ﹤0.01% |
6,350
+6,301
| +12,859% | +$243K |
|
5457
PUT
Pilgrim's Pride
PPC
$6.55B
| $230K | ﹤0.01% |
10,400
+10,193
| +4,924% | +$243K |
|
5458
Supernus Pharmaceuticals
SUPN
$2.59B
| $230K | ﹤0.01% |
7,481
-174
| -2% | -$5.33K |
|
|
ERF
5459
PUT
DELISTED
Enerplus Corporation
ERF
| $230K | ﹤0.01% |
32,100
+31,850
| +12,740% | +$196K |
|
|
NMTR
5460
CALL
DELISTED
9 Meters Biopharma
NMTR
| $230K | ﹤0.01% |
10,475
+10,312
| +6,326% | +$253K |
|
|
PCSB
5461
CALL
DELISTED
PCSB Financial Corporation
PCSB
| $230K | ﹤0.01% |
12,700
+12,573
| +9,900% | +$225K |
|
5462
Aqua Metals
AQMS
$9.03M
| $229K | ﹤0.01% |
383
+272
| +245% | +$166K |
|
5463
Teucrium Sugar Fund
CANE
$74.6M
| $229K | ﹤0.01% |
26,982
+23,413
| +656% | +$188K |
|
5464
CALL
Cintas
CTAS
$82.1B
| $229K | ﹤0.01% |
2,400
+2,276
| +1,835% | +$202K |
|
5465
PUT
Nerdy
NRDY
$105M
| $229K | ﹤0.01% |
23,100
+22,812
| +7,921% | +$231K |
|
5466
Children's Place
PLCE
$54.5M
| $229K | ﹤0.01% |
2,461
-375
| -13% | -$31.9K |
|
5467
CALL
TETRA Technologies
TTI
$1.14B
| $229K | ﹤0.01% |
52,900
+51,085
| +2,815% | +$168K |
|
|
POSH
5468
PUT
DELISTED
Poshmark, Inc. Class A Common Stock
POSH
| $229K | ﹤0.01% |
4,800
+4,695
| +4,471% | +$201K |
|
|
POLY
5469
PUT
DELISTED
Plantronics, Inc.
POLY
| $229K | ﹤0.01% |
5,500
+5,473
| +20,270% | +$205K |
|
|
WMC
5470
PUT
DELISTED
Western Asset Mortgage Capital Corporation
WMC
| $229K | ﹤0.01% |
7,050
+7,012
| +18,453% | +$232K |
|
|
CNST
5471
PUT
DELISTED
Constellation Pharmaceuticals, Inc.
CNST
| $229K | ﹤0.01% |
6,800
+6,651
| +4,464% | +$169K |
|
5472
ProShares UltraShort FTSE Europe
EPV
$11M
| $228K | ﹤0.01% |
3,748
-995
| -21% | -$62.1K |
|
5473
CALL
KBR
KBR
$4.62B
| $228K | ﹤0.01% |
6,000
+5,906
| +6,283% | +$234K |
|
5474
CALL
NexGen Energy
NXE
$6.04B
| $228K | ﹤0.01% |
55,700
+55,368
| +16,677% | +$236K |
|
5475
Invesco NASDAQ Next Gen 100 ETF
QQQJ
$1.12B
| $228K | ﹤0.01% |
6,634
+478
| +8% | +$15.6K |
|
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.