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 | |
|---|---|---|---|---|---|---|
2001
PUT
Roivant Sciences
ROIV
$25.2B
| $2.73M | ﹤0.01% |
236,300
-28,200
| -11% | -$321K |
|
2002
PUT
BCE
BCE
$19.9B
| $2.72M | ﹤0.01% |
78,300
-24,500
| -24% | -$837K |
|
2003
PUT
AutoNation
AN
$6.97B
| $2.72M | ﹤0.01% |
15,200
+5,000
| +49% | +$859K |
|
|
XIFR
2004
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $2.72M | ﹤0.01% |
98,400
-4,300
| -4% | -$112K |
|
2005
PepsiCo
PEP
$186B
| $2.71M | ﹤0.01% |
+15,947
| New | +$2.74M |
|
|
BPMC
2006
CALL
DELISTED
Blueprint Medicines
BPMC
| $2.71M | ﹤0.01% |
29,300
-3,600
| -11% | -$358K |
|
2007
CALL
Murphy USA
MUSA
$11.3B
| $2.71M | ﹤0.01% |
5,500
-1,400
| -20% | -$702K |
|
2008
PUT
Warrior Met Coal
HCC
$4.23B
| $2.71M | ﹤0.01% |
42,400
+20,200
| +91% | +$1.26M |
|
2009
CALL
Powell Industries
POWL
$8.46B
| $2.71M | ﹤0.01% |
36,600
+19,800
| +118% | +$1.08M |
|
2010
CALL
Yeti Holdings
YETI
$3.82B
| $2.71M | ﹤0.01% |
66,000
-40,300
| -38% | -$1.58M |
|
2011
PUT
Harrow
HROW
$1.43B
| $2.7M | ﹤0.01% |
60,100
-38,800
| -39% | -$1.31M |
|
2012
Mastercard
MA
$477B
| $2.7M | ﹤0.01% |
+5,473
| New | +$2.55M |
|
2013
CALL
Illinois Tool Works
ITW
$81.4B
| $2.7M | ﹤0.01% |
10,300
-28,100
| -73% | -$6.91M |
|
2014
PUT
Celldex Therapeutics
CLDX
$2.77B
| $2.7M | ﹤0.01% |
79,400
+63,700
| +406% | +$2.43M |
|
2015
CALL
Rambus
RMBS
$10.4B
| $2.7M | ﹤0.01% |
63,900
+8,800
| +16% | +$427K |
|
2016
CALL
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $2.7M | ﹤0.01% |
26,500
-4,000
| -13% | -$255K |
|
2017
CALL
Evolv Technologies
EVLV
$943M
| $2.7M | ﹤0.01% |
665,900
+128,300
| +24% | +$448K |
|
2018
CALL
Lear
LEA
$7.19B
| $2.7M | ﹤0.01% |
24,700
+18,900
| +326% | +$2.15M |
|
2019
CALL
RingCentral
RNG
$4.05B
| $2.69M | ﹤0.01% |
84,900
-3,600
| -4% | -$114K |
|
2020
PUT
Nabors Industries
NBR
$1.23B
| $2.68M | ﹤0.01% |
41,600
+12,800
| +44% | +$987K |
|
2021
CALL
Iovance Biotherapeutics
IOVA
$2.23B
| $2.68M | ﹤0.01% |
285,500
-57,800
| -17% | -$548K |
|
2022
Ventas
VTR
$48.9B
| $2.68M | ﹤0.01% |
41,795
-1,454
| -3% | -$84.9K |
|
2023
CALL
Beyond Meat
BYND
$288M
| $2.68M | ﹤0.01% |
395,100
-34,700
| -8% | -$220K |
|
2024
CALL
SM Energy
SM
$7.96B
| $2.68M | ﹤0.01% |
67,000
+32,900
| +96% | +$1.43M |
|
2025
Marvell Technology
MRVL
$174B
| $2.67M | ﹤0.01% |
+37,100
| New | +$2.56M |
|
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.