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 | |
|---|---|---|---|---|---|---|
3401
Star Bulk Carriers
SBLK
$3.02B
| $831K | ﹤0.01% |
+36,224
| New | +$716K |
|
|
CMRC
3402
CALL
Commerce.com Inc Series 1
CMRC
$234M
| $830K | ﹤0.01% |
12,800
+12,009
| +1,518% | +$680K |
|
3403
The RealReal
REAL
$1.4B
| $830K | ﹤0.01% |
42,008
-40,711
| -49% | -$832K |
|
3404
CALL
OneSpaWorld
OSW
$2.76B
| $828K | ﹤0.01% |
85,500
+84,557
| +8,967% | +$924K |
|
|
NTP
3405
CALL
DELISTED
Nam Tai Property Inc.
NTP
| $828K | ﹤0.01% |
+29,900
| New | +$627K |
|
3406
PUT
Lightspeed Commerce
LSPD
$1.35B
| $827K | ﹤0.01% |
9,900
+9,766
| +7,288% | +$686K |
|
3407
Builders FirstSource
BLDR
$7.82B
| $826K | ﹤0.01% |
19,382
-38,977
| -67% | -$1.81M |
|
3408
PUT
Chubb
CB
$139B
| $826K | ﹤0.01% |
+5,200
| New | +$862K |
|
3409
PUT
PubMatic
PUBM
$594M
| $824K | ﹤0.01% |
+21,100
| New | +$878K |
|
3410
PUT
Alarm.com
ALRM
$2.65B
| $821K | ﹤0.01% |
9,700
+9,522
| +5,349% | +$813K |
|
|
MSP
3411
PUT
DELISTED
Datto Holding Corp.
MSP
| $821K | ﹤0.01% |
29,500
+29,407
| +31,620% | +$754K |
|
3412
CALL
FormFactor
FORM
$7.7B
| $820K | ﹤0.01% |
22,500
+22,403
| +23,096% | +$883K |
|
3413
CVR Partners
UAN
$1.27B
| $820K | ﹤0.01% |
13,242
+7,533
| +132% | +$422K |
|
|
EBIX
3414
CALL
DELISTED
Ebix Inc
EBIX
| $820K | ﹤0.01% |
24,200
+24,081
| +20,236% | +$746K |
|
3415
PUT
Teradata
TDC
$2.8B
| $819K | ﹤0.01% |
16,400
+15,267
| +1,347% | +$695K |
|
|
PAYA
3416
PUT
DELISTED
Paya Holdings Inc. Class A Common Stock
PAYA
| $818K | ﹤0.01% |
74,300
+73,537
| +9,638% | +$783K |
|
|
KC
3417
CALL
Kingsoft Cloud Holdings
KC
$2.97B
| $817K | ﹤0.01% |
24,100
+23,927
| +13,831% | +$957K |
|
3418
PUT
SM Energy
SM
$7.26B
| $817K | ﹤0.01% |
+33,200
| New | +$643K |
|
|
RDFN
3419
DELISTED
Redfin
RDFN
| $816K | ﹤0.01% |
12,869
+11,501
| +841% | +$703K |
|
3420
CALL
Smith & Nephew
SNN
$13.1B
| $816K | ﹤0.01% |
18,800
+18,772
| +67,043% | +$790K |
|
|
UCTT
3421
CALL
Ultra Clean Holdings
UCTT
$3.9B
| $816K | ﹤0.01% |
+15,200
| New | +$814K |
|
3422
PUT
Wyndham Hotels & Resorts
WH
$5.58B
| $816K | ﹤0.01% |
11,300
+11,193
| +10,461% | +$827K |
|
|
EPAY
3423
PUT
DELISTED
Bottomline Technologies Inc
EPAY
| $815K | ﹤0.01% |
22,000
+21,923
| +28,471% | +$903K |
|
3424
United Natural Foods
UNFI
$2.97B
| $814K | ﹤0.01% |
22,034
+4,615
| +26% | +$168K |
|
|
ATCO
3425
DELISTED
Atlas Corp.
ATCO
| $814K | ﹤0.01% |
+57,136
| New | +$793K |
|
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.