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 | |
|---|---|---|---|---|---|---|
676
NIO
NIO
$11.6B
| $11M | 0.01% |
207,392
+195,221
| +1,604% | +$7.82M |
|
677
CALL
Enterprise Products Partners
EPD
$83.9B
| $11M | 0.01% |
+457,000
| New | +$10.8M |
|
678
CALL
Mondelez International
MDLZ
$77.1B
| $11M | 0.01% |
175,600
+174,263
| +13,034% | +$10.7M |
|
679
Boeing
BA
$165B
| $10.9M | 0.01% |
45,647
+1,588
| +4% | +$384K |
|
680
VanEck Oil Services ETF
OIH
$2.01B
| $10.9M | 0.01% |
49,910
+40,444
| +427% | +$8.45M |
|
681
PUT
MGM Resorts International
MGM
$11.5B
| $10.9M | 0.01% |
255,600
+250,820
| +5,247% | +$10.4M |
|
682
PUT
Intellia Therapeutics
NTLA
$1.55B
| $10.8M | 0.01% |
67,000
+66,590
| +16,241% | +$5.19M |
|
683
CALL
Teva Pharmaceuticals
TEVA
$36.3B
| $10.8M | 0.01% |
1,093,700
+1,087,618
| +17,883% | +$11.5M |
|
684
PUT
Harley-Davidson
HOG
$2.79B
| $10.8M | 0.01% |
236,000
+233,433
| +9,094% | +$10.8M |
|
685
PUT
NXP Semiconductors
NXPI
$70B
| $10.8M | 0.01% |
+52,500
| New | +$10.5M |
|
686
PUT
Synopsys
SNPS
$71.5B
| $10.8M | 0.01% |
39,000
+38,633
| +10,527% | +$9.8M |
|
687
PUT
Kohl's
KSS
$2.06B
| $10.8M | 0.01% |
195,100
+192,489
| +7,372% | +$11.1M |
|
688
PUT
Keysight
KEYS
$55.6B
| $10.7M | 0.01% |
69,400
+68,933
| +14,761% | +$10M |
|
689
PUT
Weyerhaeuser
WY
$17B
| $10.7M | 0.01% |
310,900
+310,101
| +38,811% | +$11.5M |
|
690
CALL
Sabre
SABR
$668M
| $10.6M | 0.01% |
851,700
+845,155
| +12,913% | +$11.9M |
|
|
FLNA
691
PUT
Filana Therapeutics
FLNA
$45M
| $10.6M | 0.01% |
124,100
+123,557
| +22,755% | +$6.62M |
|
692
CALL
Automatic Data Processing
ADP
$97.1B
| $10.6M | 0.01% |
53,300
+52,580
| +7,303% | +$10.2M |
|
|
SBNY
693
PUT
DELISTED
Signature Bank
SBNY
| $10.6M | 0.01% |
43,000
+42,788
| +20,183% | +$10.4M |
|
694
CALL
Prologis
PLD
$135B
| $10.5M | 0.01% |
88,100
+87,938
| +54,283% | +$10.3M |
|
695
Upstart Holdings
UPST
$2.64B
| $10.5M | 0.01% |
84,211
+77,298
| +1,118% | +$9.51M |
|
696
CALL
Energy Transfer Partners
ET
$70.3B
| $10.4M | 0.01% |
+983,000
| New | +$9.42M |
|
697
PUT
Teleflex
TFX
$5.81B
| $10.4M | 0.01% |
26,000
+25,959
| +63,315% | +$10.6M |
|
|
SHNY
698
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $10.4M | 0.01% |
414,900
+408,993
| +6,924% | +$10.3M |
|
699
PUT
Crocs
CROX
$6.58B
| $10.4M | 0.01% |
89,300
+88,339
| +9,192% | +$8.69M |
|
700
CALL
ASML
ASML
$693B
| $10.4M | 0.01% |
15,000
+14,697
| +4,850% | +$9.69M |
|
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.