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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3101
CALL
NCR Voyix
VYX
$1.12B
| $824K | ﹤0.01% |
63,800
+60,100
| +1,624% | +$803K |
|
|
VNET
3102
PUT
VNET Group
VNET
$2.07B
| $823K | ﹤0.01% |
201,900
+196,900
| +3,938% | +$474K |
|
3103
CALL
Marriott Vacations Worldwide
VAC
$3.34B
| $822K | ﹤0.01% |
11,200
-11,800
| -51% | -$911K |
|
|
PRMW
3104
CALL
DELISTED
Primo Water Corporation
PRMW
| $820K | ﹤0.01% |
32,500
+14,000
| +76% | +$313K |
|
3105
PUT
Krystal Biotech
KRYS
$9.99B
| $819K | ﹤0.01% |
4,500
+1,700
| +61% | +$328K |
|
3106
Chemours
CC
$2.55B
| $818K | ﹤0.01% |
+40,281
| New | +$823K |
|
3107
PUT
GDS Holdings
GDS
$6.25B
| $818K | ﹤0.01% |
40,100
+28,300
| +240% | +$400K |
|
3108
O-I Glass
OI
$1.44B
| $818K | ﹤0.01% |
62,372
+12,762
| +26% | +$153K |
|
3109
Altimmune
ALT
$554M
| $817K | ﹤0.01% |
133,165
-32,924
| -20% | -$223K |
|
3110
Skywest
SKYW
$4.26B
| $816K | ﹤0.01% |
9,598
-5,586
| -37% | -$438K |
|
3111
PUT
Genesis Energy
GEL
$1.81B
| $815K | ﹤0.01% |
61,000
+19,700
| +48% | +$268K |
|
3112
CALL
Bio-Techne
TECH
$11.2B
| $815K | ﹤0.01% |
10,200
-5,700
| -36% | -$428K |
|
3113
PUT
Algoma Steel
ASTL
$452M
| $813K | ﹤0.01% |
79,500
-100
| -0.1% | -$921 |
|
3114
PUT
Huntsman Corp
HUN
$2.12B
| $813K | ﹤0.01% |
33,600
+3,900
| +13% | +$86.5K |
|
3115
CALL
Tarsus Pharmaceuticals
TARS
$2.62B
| $812K | ﹤0.01% |
24,700
+10,700
| +76% | +$301K |
|
|
KEEL
3116
PUT
Keel Infrastructure Corp
KEEL
$2.46B
| $810K | ﹤0.01% |
384,000
+121,000
| +46% | +$280K |
|
3117
CALL
Endava
DAVA
$145M
| $809K | ﹤0.01% |
31,700
+9,900
| +45% | +$297K |
|
3118
PUT
Cal-Maine
CALM
$4.17B
| $808K | ﹤0.01% |
10,800
+2,200
| +26% | +$152K |
|
3119
PUT
HighPeak Energy
HPK
$897M
| $806K | ﹤0.01% |
58,100
-10,700
| -16% | -$163K |
|
3120
ARS Pharmaceuticals
SPRY
$578M
| $806K | ﹤0.01% |
+55,615
| New | +$661K |
|
3121
PUT
B2Gold
BTG
$5.1B
| $805K | ﹤0.01% |
261,500
-216,300
| -45% | -$628K |
|
3122
Applied Optoelectronics
AAOI
$7.6B
| $803K | ﹤0.01% |
56,126
+33,218
| +145% | +$344K |
|
3123
PUT
Black Stone Minerals
BSM
$3.13B
| $803K | ﹤0.01% |
53,200
-17,600
| -25% | -$264K |
|
3124
PUT
Verisk Analytics
VRSK
$26.9B
| $803K | ﹤0.01% |
3,000
+1,200
| +67% | +$325K |
|
3125
PUT
RUM Group Inc
RUM
$1.62B
| $802K | ﹤0.01% |
149,700
+44,900
| +43% | +$264K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.