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 | |
|---|---|---|---|---|---|---|
|
ABMD
3551
PUT
DELISTED
Abiomed Inc
ABMD
| $749K | ﹤0.01% |
2,400
+2,334
| +3,536% | +$716K |
|
3552
PUT
SL Green Realty
SLG
$3.83B
| $747K | ﹤0.01% |
9,343
+9,142
| +4,548% | +$694K |
|
|
DNB
3553
PUT
DELISTED
Dun & Bradstreet
DNB
| $745K | ﹤0.01% |
34,900
+34,868
| +108,963% | +$781K |
|
|
MAG
3554
CALL
DELISTED
MAG Silver
MAG
| $744K | ﹤0.01% |
+35,600
| New | +$705K |
|
3555
PUT
McEwen Inc
MUX
$1.04B
| $744K | ﹤0.01% |
+53,960
| New | +$714K |
|
3556
Target
TGT
$63.7B
| $744K | ﹤0.01% |
3,079
-436
| -12% | -$95.4K |
|
3557
Textron
TXT
$16.7B
| $744K | ﹤0.01% |
10,833
+10,051
| +1,285% | +$650K |
|
3558
Newell Brands
NWL
$2.2B
| $743K | ﹤0.01% |
27,065
+15,262
| +129% | +$421K |
|
|
SWN
3559
CALL
DELISTED
Southwestern Energy Company
SWN
| $743K | ﹤0.01% |
131,100
+129,994
| +11,754% | +$639K |
|
|
GOEV
3560
PUT
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $743K | ﹤0.01% |
163
+162
| +16,200% | +$655K |
|
3561
CALL
Unum
UNM
$13.8B
| $741K | ﹤0.01% |
26,100
+25,702
| +6,458% | +$755K |
|
3562
American International
AIG
$42B
| $740K | ﹤0.01% |
+15,557
| New | +$769K |
|
3563
PUT
PureCycle Technologies
PCT
$1.2B
| $740K | ﹤0.01% |
+31,300
| New | +$674K |
|
3564
PUT
Philips
PHG
$24.3B
| $740K | ﹤0.01% |
18,038
+17,832
| +8,656% | +$824K |
|
|
VNET
3565
PUT
VNET Group
VNET
$2.04B
| $738K | ﹤0.01% |
32,200
+31,869
| +9,628% | +$812K |
|
3566
CALL
Broadstone Net Lease
BNL
$4.29B
| $737K | ﹤0.01% |
31,500
+31,384
| +27,055% | +$674K |
|
3567
PUT
Construction Partners
ROAD
$5.94B
| $737K | ﹤0.01% |
23,500
+23,104
| +5,834% | +$726K |
|
3568
PUT
Ardelyx
ARDX
$1.25B
| $736K | ﹤0.01% |
97,100
+97,056
| +220,582% | +$718K |
|
3569
PUT
Willis Towers Watson
WTW
$28.6B
| $736K | ﹤0.01% |
3,200
+3,193
| +45,614% | +$794K |
|
3570
PUT
Yum! Brands
YUM
$40.7B
| $736K | ﹤0.01% |
6,400
+5,990
| +1,461% | +$706K |
|
3571
PUT
Eastman Chemical
EMN
$7.74B
| $735K | ﹤0.01% |
6,300
+5,979
| +1,863% | +$718K |
|
3572
PUT
Pediatrix Medical
MD
$2.15B
| $735K | ﹤0.01% |
24,400
+24,139
| +9,249% | +$712K |
|
3573
Clarivate
CLVT
$1.36B
| $734K | ﹤0.01% |
26,670
+17,610
| +194% | +$484K |
|
3574
Pan American Silver
PAAS
$18.6B
| $734K | ﹤0.01% |
25,716
-30,316
| -54% | -$977K |
|
|
EDR
3575
CALL
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $734K | ﹤0.01% |
+26,500
| New | +$763K |
|
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.