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 | |
|---|---|---|---|---|---|---|
3851
Caleres
CAL
$445M
| $395K | ﹤0.01% |
+11,963
| New | +$434K |
|
|
LSEA
3852
CALL
DELISTED
Landsea Homes
LSEA
| $395K | ﹤0.01% |
32,000
-16,400
| -34% | -$187K |
|
|
QXO
3853
QXO Inc
QXO
$14.7B
| $395K | ﹤0.01% |
+25,093
| New | +$732K |
|
3854
CALL
Alliant Energy
LNT
$19.2B
| $394K | ﹤0.01% |
6,500
-4,100
| -39% | -$233K |
|
3855
iShares Expanded Tech-Software Sector ETF
IGV
$12.4B
| $393K | ﹤0.01% |
4,400
-9,555
| -68% | -$819K |
|
3856
PUT
BigBear.ai
BBAI
$1.34B
| $392K | ﹤0.01% |
268,600
+37,200
| +16% | +$54.9K |
|
3857
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$527M
| $392K | ﹤0.01% |
3,048
-19,638
| -87% | -$2.56M |
|
3858
CALL
AXIS Capital
AXS
$8.78B
| $390K | ﹤0.01% |
4,900
+4,000
| +444% | +$299K |
|
3859
CALL
Corporacion America
CAAP
$4.27B
| $389K | ﹤0.01% |
22,300
-34,400
| -61% | -$558K |
|
3860
CALL
Spire Global
SPIR
$433M
| $389K | ﹤0.01% |
39,000
-16,300
| -29% | -$170K |
|
3861
PUT
Shutterstock
SSTK
$219M
| $389K | ﹤0.01% |
11,000
-8,700
| -44% | -$321K |
|
3862
CALL
Eve Holding
EVEX
$843M
| $388K | ﹤0.01% |
119,900
+118,900
| +11,890% | +$359K |
|
3863
CALL
Ultragenyx Pharmaceutical
RARE
$2.53B
| $388K | ﹤0.01% |
7,000
-7,500
| -52% | -$382K |
|
3864
PUT
Radian Group
RDN
$5.23B
| $388K | ﹤0.01% |
11,200
-30,300
| -73% | -$1.05M |
|
3865
PUT
Apple Hospitality REIT
APLE
$3.98B
| $387K | ﹤0.01% |
26,100
+3,500
| +15% | +$50.6K |
|
3866
IES Holdings
IESC
$10.7B
| $386K | ﹤0.01% |
+1,935
| New | +$314K |
|
3867
PUT
Coursera
COUR
$1.69B
| $385K | ﹤0.01% |
48,500
+42,000
| +646% | +$332K |
|
3868
PUT
Pacira BioSciences
PCRX
$1.06B
| $385K | ﹤0.01% |
25,600
+20,500
| +402% | +$350K |
|
3869
PUT
TMC The Metals Company
TMC
$1.56B
| $385K | ﹤0.01% |
363,700
+120,500
| +50% | +$135K |
|
3870
CALL
Westlake Chemical Partners
WLKP
$771M
| $385K | ﹤0.01% |
17,200
-2,400
| -12% | -$54.5K |
|
3871
PUT
Agree Realty
ADC
$9.72B
| $384K | ﹤0.01% |
5,100
-13,400
| -72% | -$948K |
|
3872
CALL
Genpact
G
$5.85B
| $384K | ﹤0.01% |
9,800
+6,300
| +180% | +$228K |
|
3873
Mama's Creations
MAMA
$833M
| $384K | ﹤0.01% |
52,607
-6,347
| -11% | -$48.8K |
|
3874
Enova International
ENVA
$6.17B
| $382K | ﹤0.01% |
4,560
+1,278
| +39% | +$99K |
|
3875
CALL
Sinclair Inc
SBGI
$1.02B
| $382K | ﹤0.01% |
25,000
+11,500
| +85% | +$161K |
|
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.