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 | |
|---|---|---|---|---|---|---|
4876
PUT
Huntsman Corp
HUN
$2.1B
| $318K | ﹤0.01% |
12,000
+10,811
| +909% | +$307K |
|
4877
Kopin
KOPN
$586M
| $318K | ﹤0.01% |
38,904
-43,962
| -53% | -$364K |
|
|
IBTX
4878
PUT
DELISTED
Independent Bank Group, Inc.
IBTX
| $318K | ﹤0.01% |
+4,300
| New | +$326K |
|
|
MN
4879
PUT
DELISTED
MANNING & NAPIER, INC.
MN
| $317K | ﹤0.01% |
40,300
+40,218
| +49,046% | +$304K |
|
|
ENV
4880
DELISTED
ENVESTNET, INC.
ENV
| $317K | ﹤0.01% |
+4,190
| New | +$308K |
|
|
APLS
4881
PUT
DELISTED
Apellis Pharmaceuticals
APLS
| $316K | ﹤0.01% |
5,000
+4,923
| +6,394% | +$254K |
|
4882
PUT
St. Joe Company
JOE
$3.55B
| $316K | ﹤0.01% |
7,100
+6,983
| +5,968% | +$315K |
|
4883
PUT
Precigen
PGEN
$1.94B
| $316K | ﹤0.01% |
+48,600
| New | +$340K |
|
|
LSXMK
4884
DELISTED
Liberty Media Corporation Series C Liberty SiriusXM Common Stock
LSXMK
| $316K | ﹤0.01% |
+8,818
| New | +$304K |
|
|
AMPE
4885
CALL
DELISTED
Ampio Pharmaceuticals Inc.
AMPE
| $316K | ﹤0.01% |
631
+629
| +31,450% | +$338K |
|
4886
PUT
Popular Inc
BPOP
$11B
| $315K | ﹤0.01% |
4,200
+4,116
| +4,900% | +$315K |
|
4887
Camtek
CAMT
$5.92B
| $315K | ﹤0.01% |
8,367
+7,437
| +800% | +$252K |
|
|
ESPR
4888
DELISTED
Esperion Therapeutics
ESPR
| $315K | ﹤0.01% |
14,902
+8,946
| +150% | +$215K |
|
4889
PUT
JELD-WEN Holding
JELD
$110M
| $315K | ﹤0.01% |
12,000
+11,903
| +12,271% | +$337K |
|
|
LITS
4890
CALL
Lite Strategy Inc
LITS
$32.4M
| $315K | ﹤0.01% |
5,540
+5,448
| +5,922% | +$350K |
|
4891
CALL
PRA Group
PRAA
$672M
| $315K | ﹤0.01% |
8,200
+8,088
| +7,221% | +$311K |
|
4892
CALL
Watsco Inc
WSO
$13.2B
| $315K | ﹤0.01% |
1,100
+1,098
| +54,900% | +$314K |
|
|
ENG
4893
PUT
DELISTED
ENGlobal Corp
ENG
| $315K | ﹤0.01% |
13,000
+12,883
| +11,011% | +$324K |
|
4894
Acacia Research
ACTG
$437M
| $314K | ﹤0.01% |
46,508
-19,031
| -29% | -$113K |
|
4895
PUT
Beazer Homes USA
BZH
$888M
| $314K | ﹤0.01% |
16,300
+16,190
| +14,718% | +$355K |
|
4896
PUT
Coca-Cola Europacific Partners
CCEP
$49.1B
| $314K | ﹤0.01% |
5,300
+5,150
| +3,433% | +$300K |
|
4897
PUT
CDW
CDW
$18.9B
| $314K | ﹤0.01% |
1,800
+1,779
| +8,471% | +$306K |
|
4898
Cadiz
CDZI
$251M
| $314K | ﹤0.01% |
+23,116
| New | +$277K |
|
4899
MacroGenics
MGNX
$233M
| $314K | ﹤0.01% |
11,706
-2,278
| -16% | -$66.7K |
|
4900
CALL
New Fortress Energy
NFE
$92.9M
| $314K | ﹤0.01% |
8,300
+8,083
| +3,725% | +$346K |
|
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.