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 | |
|---|---|---|---|---|---|---|
4551
CALL
Brookfield Infrastructure Partners
BIP
$19.6B
| $388K | ﹤0.01% |
10,500
+10,260
| +4,275% | +$371K |
|
4552
PUT
Bankunited
BKU
$3.33B
| $388K | ﹤0.01% |
9,100
+9,094
| +151,567% | +$415K |
|
4553
CALL
TransDigm Group
TDG
$70.7B
| $388K | ﹤0.01% |
600
+589
| +5,355% | +$369K |
|
|
ALTU
4554
DELISTED
Altitude Acquisition Corp
ALTU
| $388K | ﹤0.01% |
+39,640
| New | +$391K |
|
4555
CALL
East-West Bancorp
EWBC
$17.8B
| $387K | ﹤0.01% |
5,400
+5,371
| +18,521% | +$399K |
|
4556
RLX Technology
RLX
$2.37B
| $387K | ﹤0.01% |
44,420
-51,913
| -54% | -$530K |
|
4557
Aemetis
AMTX
$99.2M
| $386K | ﹤0.01% |
+34,642
| New | +$546K |
|
|
DENN
4558
DELISTED
Denny's
DENN
| $386K | ﹤0.01% |
23,434
+1,965
| +9% | +$34.4K |
|
4559
PUT
Fidelity National Financial
FNF
$14.4B
| $386K | ﹤0.01% |
9,256
+9,223
| +27,948% | +$403K |
|
4560
CALL
Inspired Entertainment
INSE
$183M
| $386K | ﹤0.01% |
+30,300
| New | +$305K |
|
|
CVA
4561
DELISTED
Covanta Holding Corporation
CVA
| $386K | ﹤0.01% |
21,948
+6,750
| +44% | +$103K |
|
4562
CALL
Barings BDC
BBDC
$869M
| $385K | ﹤0.01% |
36,500
+35,858
| +5,585% | +$374K |
|
4563
CALL
1-800-Flowers.com
FLWS
$252M
| $385K | ﹤0.01% |
12,100
+11,485
| +1,867% | +$358K |
|
|
SGMO
4564
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $385K | ﹤0.01% |
+32,200
| New | +$365K |
|
|
SPTN
4565
DELISTED
SpartanNash
SPTN
| $385K | ﹤0.01% |
19,960
+16,537
| +483% | +$330K |
|
4566
Vanguard Small-Cap Value ETF
VBR
$37.2B
| $385K | ﹤0.01% |
+2,221
| New | +$385K |
|
4567
Costamare
CMRE
$1.85B
| $384K | ﹤0.01% |
32,533
+14,982
| +85% | +$161K |
|
4568
PUT
Roundhill Sports Betting & iGaming ETF
BETZ
$51M
| $383K | ﹤0.01% |
14,100
+13,908
| +7,244% | +$436K |
|
4569
iShares International Select Dividend ETF
IDV
$8.31B
| $383K | ﹤0.01% |
11,828
-3,089
| -21% | -$102K |
|
4570
PUT
OptimizeRx
OPRX
$120M
| $383K | ﹤0.01% |
6,200
+6,190
| +61,900% | +$315K |
|
4571
PUT
Suburban Propane Partners
SPH
$1.21B
| $383K | ﹤0.01% |
25,000
+24,708
| +8,462% | +$370K |
|
|
USCR
4572
DELISTED
U S Concrete, Inc.
USCR
| $383K | ﹤0.01% |
5,201
-5,746
| -52% | -$372K |
|
4573
CALL
Bright Horizons
BFAM
$4.35B
| $382K | ﹤0.01% |
2,600
+2,599
| +259,900% | +$389K |
|
4574
PUT
Hudbay
HBM
$9.76B
| $382K | ﹤0.01% |
57,400
+57,181
| +26,110% | +$427K |
|
4575
CALL
Fate Therapeutics
FATE
$275M
| $381K | ﹤0.01% |
4,400
+4,362
| +11,479% | +$351K |
|
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.