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 | |
|---|---|---|---|---|---|---|
|
EVBG
3776
PUT
DELISTED
Everbridge, Inc. Common Stock
EVBG
| $639K | ﹤0.01% |
4,700
+4,696
| +117,400% | +$587K |
|
3777
PUT
Booz Allen Hamilton
BAH
$8.78B
| $638K | ﹤0.01% |
7,500
+7,437
| +11,805% | +$629K |
|
|
ORIO
3778
CALL
Orion Digital Corp
ORIO
$15.6M
| $638K | ﹤0.01% |
27,133
+26,852
| +9,556% | +$643K |
|
3779
State Street Financial Select Sector SPDR ETF
XLF
$57.4B
| $638K | ﹤0.01% |
+17,401
| New | +$637K |
|
3780
CrowdStrike
CRWD
$185B
| $637K | ﹤0.01% |
+10,140
| New | +$546K |
|
3781
PUT
Clearway Energy Class C
CWEN
$4.9B
| $637K | ﹤0.01% |
25,200
+25,191
| +279,900% | +$691K |
|
3782
PUT
Flowserve
FLS
$9.38B
| $637K | ﹤0.01% |
15,800
+15,712
| +17,855% | +$649K |
|
|
HUYA
3783
CALL
Huya Inc
HUYA
$561M
| $637K | ﹤0.01% |
36,100
+35,175
| +3,803% | +$590K |
|
3784
PUT
Safe Bulkers
SB
$761M
| $637K | ﹤0.01% |
158,900
+157,311
| +9,900% | +$551K |
|
3785
Atkore
ATKR
$2.62B
| $636K | ﹤0.01% |
8,967
+7,547
| +531% | +$575K |
|
|
EXK
3786
CALL
Endeavour Silver
EXK
$2.29B
| $636K | ﹤0.01% |
104,000
+103,478
| +19,823% | +$647K |
|
3787
CALL
Milestone Pharmaceuticals
MIST
$133M
| $636K | ﹤0.01% |
115,700
+114,401
| +8,807% | +$649K |
|
3788
PUT
ZK International Group
ZKIN
$70.5M
| $635K | ﹤0.01% |
+21,171
| New | +$804K |
|
|
AAWW
3789
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $635K | ﹤0.01% |
9,325
+7,207
| +340% | +$505K |
|
3790
Scotiabank
BNS
$108B
| $634K | ﹤0.01% |
+9,755
| New | +$631K |
|
3791
CALL
Huron Consulting
HURN
$1.97B
| $634K | ﹤0.01% |
+12,900
| New | +$693K |
|
|
RMGB
3792
PUT
DELISTED
RMG Acquisition Corp. II Class A Ordinary Shares
RMGB
| $634K | ﹤0.01% |
63,800
+63,759
| +155,510% | +$635K |
|
3793
CALL
Tyler Technologies
TYL
$13.7B
| $633K | ﹤0.01% |
1,400
+1,378
| +6,264% | +$586K |
|
3794
CALL
American Outdoor Brands
AOUT
$159M
| $632K | ﹤0.01% |
+18,000
| New | +$531K |
|
3795
Liberty Global Class C
LBTYK
$3.4B
| $631K | ﹤0.01% |
23,338
-3,329
| -12% | -$89.8K |
|
3796
CALL
ThredUp
TDUP
$760M
| $631K | ﹤0.01% |
+21,700
| New | +$468K |
|
|
YALA
3797
Yalla Group
YALA
$824M
| $631K | ﹤0.01% |
31,581
+10,719
| +51% | +$217K |
|
3798
Riot Platforms
RIOT
$8.03B
| $630K | ﹤0.01% |
16,741
-23,252
| -58% | -$831K |
|
3799
CALL
Greif
GEF
$4.74B
| $629K | ﹤0.01% |
10,400
+10,392
| +129,900% | +$635K |
|
|
YALA
3800
CALL
Yalla Group
YALA
$824M
| $629K | ﹤0.01% |
31,500
+31,428
| +43,650% | +$635K |
|
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.