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 | |
|---|---|---|---|---|---|---|
|
JOAN
5951
PUT
DELISTED
JOANN, Inc. Common Stock
JOAN
| $170K | ﹤0.01% |
+10,800
| New | +$148K |
|
|
ARC
5952
PUT
DELISTED
ARC Document Solutions, Inc.
ARC
| $170K | ﹤0.01% |
79,200
+77,991
| +6,451% | +$171K |
|
5953
iShares Asia 50 ETF
AIA
$4.6B
| $169K | ﹤0.01% |
1,854
+196
| +12% | +$17.9K |
|
5954
PUT
Boise Cascade
BCC
$2.69B
| $169K | ﹤0.01% |
2,900
+2,872
| +10,257% | +$186K |
|
5955
CALL
Franklin Resources
BEN
$17.6B
| $169K | ﹤0.01% |
5,300
+5,238
| +8,448% | +$170K |
|
5956
PUT
Calumet Specialty Products
CLMT
$3.85B
| $169K | ﹤0.01% |
24,700
+24,508
| +12,765% | +$151K |
|
5957
CALL
Fortune Brands Innovations
FBIN
$5.88B
| $169K | ﹤0.01% |
1,989
+1,883
| +1,776% | +$165K |
|
5958
Granite Construction
GVA
$5.29B
| $169K | ﹤0.01% |
+4,091
| New | +$162K |
|
5959
MiMedx Group
MDXG
$602M
| $169K | ﹤0.01% |
13,581
+9,553
| +237% | +$103K |
|
5960
Medpace
MEDP
$16.1B
| $169K | ﹤0.01% |
959
-1,642
| -63% | -$283K |
|
5961
Simulations Plus
SLP
$369M
| $169K | ﹤0.01% |
3,095
+2,230
| +258% | +$128K |
|
5962
CALL
Tempest Therapeutics
TPST
$13.7M
| $169K | ﹤0.01% |
1,169
+1,166
| +38,867% | +$262K |
|
|
DSKE
5963
CALL
DELISTED
Daseke, Inc. Common Stock
DSKE
| $169K | ﹤0.01% |
26,200
+25,685
| +4,987% | +$186K |
|
|
SAFM
5964
PUT
DELISTED
Sanderson Farms Inc
SAFM
| $169K | ﹤0.01% |
900
+662
| +278% | +$111K |
|
|
SRAX
5965
PUT
DELISTED
SRAX, Inc. Class A Common Stock
SRAX
| $169K | ﹤0.01% |
31,200
+31,024
| +17,627% | +$149K |
|
5966
CALL
Blackbaud
BLKB
$1.94B
| $168K | ﹤0.01% |
2,200
+2,179
| +10,376% | +$157K |
|
5967
CALL
Century Aluminum
CENX
$4.43B
| $168K | ﹤0.01% |
+13,100
| New | +$189K |
|
|
DALN
5968
CALL
DELISTED
DallasNews
DALN
| $168K | ﹤0.01% |
22,600
+22,596
| +564,900% | +$177K |
|
5969
VanEck Video Gaming and eSports ETF
ESPO
$245M
| $168K | ﹤0.01% |
2,319
+37
| +2% | +$2.6K |
|
5970
CALL
Myers Industries
MYE
$1.29B
| $168K | ﹤0.01% |
+8,000
| New | +$171K |
|
5971
PUT
Rush Enterprises Class A
RUSHA
$6.2B
| $168K | ﹤0.01% |
5,850
+5,835
| +38,900% | +$187K |
|
5972
PUT
abrdn Physical Silver Shares ETF
SIVR
$4.02B
| $168K | ﹤0.01% |
6,700
+6,637
| +10,535% | +$171K |
|
5973
CALL
Silicon Laboratories
SLAB
$7.17B
| $168K | ﹤0.01% |
1,100
+962
| +697% | +$134K |
|
5974
CALL
Valvoline
VVV
$4.9B
| $168K | ﹤0.01% |
5,200
+5,155
| +11,456% | +$160K |
|
|
BFI
5975
DELISTED
BurgerFi International, Inc. Common Stock
BFI
| $168K | ﹤0.01% |
16,860
+4,794
| +40% | +$56.2K |
|
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.