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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2626
Matador Resources
MTDR
$6.31B
| $974K | ﹤0.01% |
18,634
+10,660
| +134% | +$515K |
|
2627
CALL
uniQure
QURE
$2.68B
| $974K | ﹤0.01% |
85,000
+28,700
| +51% | +$544K |
|
2628
PubMatic
PUBM
$581M
| $973K | ﹤0.01% |
53,240
+25,858
| +94% | +$411K |
|
2629
CALL
RB Global
RBA
$20.8B
| $972K | ﹤0.01% |
16,200
-4,300
| -21% | -$242K |
|
|
VLRS
2630
Controladora Vuela Compania de Aviacion
VLRS
$876M
| $972K | ﹤0.01% |
+69,679
| New | +$896K |
|
2631
PUT
Teucrium Agricultural Fund
TAGS
$19.6M
| $970K | ﹤0.01% |
63,200
+41,900
| +197% | +$1.3M |
|
2632
CALL
Polestar Automotive Holding UK
PSNY
$1.98B
| $969K | ﹤0.01% |
8,460
+5,627
| +199% | +$607K |
|
|
BKI
2633
PUT
DELISTED
Black Knight, Inc. Common Stock
BKI
| $967K | ﹤0.01% |
16,200
+4,200
| +35% | +$236K |
|
2634
CALL
Alkermes
ALKS
$8.82B
| $964K | ﹤0.01% |
30,800
-31,600
| -51% | -$957K |
|
2635
CALL
OptimizeRx
OPRX
$117M
| $964K | ﹤0.01% |
67,500
+63,800
| +1,724% | +$909K |
|
2636
Thor Industries
THO
$3.99B
| $963K | ﹤0.01% |
9,307
+4,382
| +89% | +$370K |
|
2637
Green Plains
GPRE
$1.19B
| $961K | ﹤0.01% |
+29,815
| New | +$944K |
|
2638
Replimune Group
REPL
$814M
| $959K | ﹤0.01% |
+41,332
| New | +$808K |
|
2639
CALL
Paysafe
PSFE
$407M
| $958K | ﹤0.01% |
95,000
+5,000
| +6% | +$63.3K |
|
2640
RingCentral
RNG
$4.05B
| $956K | ﹤0.01% |
29,222
+14,160
| +94% | +$435K |
|
2641
Vishay Intertechnology
VSH
$5.86B
| $956K | ﹤0.01% |
+32,544
| New | +$795K |
|
2642
CALL
Huntington Ingalls Industries
HII
$11.3B
| $955K | ﹤0.01% |
4,200
+1,800
| +75% | +$374K |
|
2643
Rogers Corp
ROG
$2.33B
| $955K | ﹤0.01% |
5,900
| – | – |
|
2644
Clear Secure
YOU
$5.26B
| $954K | ﹤0.01% |
41,196
-30,322
| -42% | -$749K |
|
2645
PUT
Globant
GLOB
$1.35B
| $952K | ﹤0.01% |
5,300
+2,800
| +112% | +$459K |
|
2646
CALL
Jefferies Financial Group
JEF
$12.9B
| $951K | ﹤0.01% |
30,200
+22,300
| +282% | +$696K |
|
2647
CALL
NOV
NOV
$7.45B
| $951K | ﹤0.01% |
59,300
+34,800
| +142% | +$567K |
|
2648
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $950K | ﹤0.01% |
3,500
-2,100
| -38% | -$520K |
|
|
FLNA
2649
Filana Therapeutics
FLNA
$43M
| $950K | ﹤0.01% |
38,751
+34,351
| +781% | +$827K |
|
2650
PUT
FMC
FMC
$1.42B
| $949K | ﹤0.01% |
9,100
+7,900
| +658% | +$888K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.