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 | |
|---|---|---|---|---|---|---|
551
CALL
Johnson Controls International
JCI
$86.9B
| $15M | 0.01% |
218,800
+217,387
| +15,385% | +$14M |
|
552
PUT
Boston Scientific
BSX
$63.9B
| $15M | 0.01% |
350,900
+349,585
| +26,584% | +$14.7M |
|
553
CALL
Ulta Beauty
ULTA
$20.8B
| $14.9M | 0.01% |
+43,000
| New | +$14.1M |
|
|
FISV
554
CALL
Fiserv Inc
FISV
$26.8B
| $14.8M | 0.01% |
138,300
+136,282
| +6,753% | +$15.8M |
|
555
PUT
Marathon Petroleum
MPC
$92.2B
| $14.7M | 0.01% |
243,100
+239,075
| +5,940% | +$14M |
|
556
PUT
The Mosaic Company
MOS
$7.24B
| $14.6M | 0.01% |
+458,600
| New | +$15.6M |
|
557
CALL
Palo Alto Networks
PANW
$273B
| $14.5M | 0.01% |
235,200
+233,502
| +13,752% | +$13.8M |
|
558
CALL
Illumina
ILMN
$28.9B
| $14.5M | 0.01% |
31,560
+30,709
| +3,609% | +$12.4M |
|
559
CALL
Intercontinental Exchange
ICE
$80.6B
| $14.4M | 0.01% |
121,400
+120,246
| +10,420% | +$13.8M |
|
560
PUT
TJX Companies
TJX
$172B
| $14.4M | 0.01% |
213,200
+210,540
| +7,915% | +$14.4M |
|
561
PUT
Align Technology
ALGN
$12.4B
| $14.4M | 0.01% |
+23,500
| New | +$13.9M |
|
562
PUT
Arista Networks
ANET
$220B
| $14.3M | 0.01% |
+630,400
| New | +$13.2M |
|
|
FSR
563
CALL
DELISTED
Fisker Inc.
FSR
| $14.2M | 0.01% |
738,200
+735,523
| +27,476% | +$10.9M |
|
564
PUT
SolarEdge
SEDG
$2.91B
| $14.2M | 0.01% |
+51,400
| New | +$12.9M |
|
565
PUT
Generac Holdings
GNRC
$12.6B
| $14.2M | 0.01% |
34,100
+33,924
| +19,275% | +$11.4M |
|
566
XPeng
XPEV
$12.3B
| $14.2M | 0.01% |
318,661
-240,228
| -43% | -$8.19M |
|
567
CALL
Macy's
M
$6.4B
| $14.1M | 0.01% |
745,700
+737,234
| +8,708% | +$13.1M |
|
568
CALL
Colgate-Palmolive
CL
$73.3B
| $14.1M | 0.01% |
173,200
+171,809
| +12,351% | +$14M |
|
569
PUT
Tencent Music
TME
$14.4B
| $14.1M | 0.01% |
909,800
+903,494
| +14,328% | +$15M |
|
570
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $14.1M | 0.01% |
208,500
+205,413
| +6,654% | +$9.63M |
|
571
Citigroup
C
$222B
| $14M | 0.01% |
198,036
-41,871
| -17% | -$3.1M |
|
572
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $14M | 0.01% |
126,300
+125,838
| +27,238% | +$14.2M |
|
573
Novavax
NVAX
$1.3B
| $14M | 0.01% |
65,867
+38,016
| +136% | +$6.97M |
|
574
CALL
Waste Management
WM
$94.9B
| $14M | 0.01% |
99,800
+98,861
| +10,528% | +$13.7M |
|
575
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $14M | 0.01% |
+25,000
| New | +$12.7M |
|
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.