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 | |
|---|---|---|---|---|---|---|
4726
Mercer International
MERC
$40.5M
| $162K | ﹤0.01% |
23,938
+5,512
| +30% | +$38.1K |
|
4727
Universal Health Services
UHS
$10.2B
| $162K | ﹤0.01% |
711
-772
| -52% | -$166K |
|
|
SBDS
4728
DELISTED
Solo Brands Inc
SBDS
| $162K | ﹤0.01% |
2,873
+1,282
| +81% | +$91.2K |
|
4729
CALL
APi Group
APG
$16.7B
| $161K | ﹤0.01% |
7,350
-11,250
| -60% | -$264K |
|
4730
Invesco Senior Loan ETF
BKLN
$6.96B
| $161K | ﹤0.01% |
7,684
-66,833
| -90% | -$1.4M |
|
4731
CALL
Lufax Holding
LU
$1.33B
| $161K | ﹤0.01% |
46,400
-223,200
| -83% | -$584K |
|
4732
CALL
Mitsubishi UFJ Financial
MUFG
$247B
| $161K | ﹤0.01% |
15,900
-13,500
| -46% | -$143K |
|
4733
CALL
Novanta
NOVT
$4.91B
| $161K | ﹤0.01% |
900
+300
| +50% | +$52.1K |
|
4734
PUT
Navitas Semiconductor
NVTS
$2.54B
| $161K | ﹤0.01% |
65,900
+28,100
| +74% | +$91.2K |
|
4735
NatWest
NWG
$69.9B
| $161K | ﹤0.01% |
17,242
-7,671
| -31% | -$68.2K |
|
|
PLL
4736
PUT
DELISTED
Piedmont Lithium
PLL
| $161K | ﹤0.01% |
18,100
-37,600
| -68% | -$340K |
|
4737
Surgery Partners
SGRY
$2.15B
| $161K | ﹤0.01% |
+5,002
| New | +$148K |
|
|
SLRN
4738
PUT
DELISTED
ACELYRIN
SLRN
| $161K | ﹤0.01% |
32,800
+32,300
| +6,460% | +$167K |
|
4739
CALL
Syndax Pharmaceuticals
SNDX
$1.7B
| $161K | ﹤0.01% |
8,400
+3,600
| +75% | +$74.4K |
|
4740
PUT
Target Hospitality
TH
$1.43B
| $161K | ﹤0.01% |
20,700
-78,100
| -79% | -$730K |
|
4741
PUT
United Microelectronic
UMC
$42.9B
| $161K | ﹤0.01% |
19,200
-60,300
| -76% | -$504K |
|
4742
PUT
Innodata
INOD
$1.81B
| $160K | ﹤0.01% |
9,600
+7,200
| +300% | +$121K |
|
4743
CALL
Ironwood Pharmaceuticals
IRWD
$586M
| $160K | ﹤0.01% |
39,000
-8,300
| -18% | -$44.6K |
|
4744
CALL
Itron
ITRI
$4.48B
| $160K | ﹤0.01% |
1,500
-5,600
| -79% | -$567K |
|
4745
PUT
Main Street Capital
MAIN
$5.05B
| $160K | ﹤0.01% |
3,200
-300
| -9% | -$15K |
|
4746
PUT
Patria Investments
PAX
$1.72B
| $160K | ﹤0.01% |
14,400
+5,100
| +55% | +$60.5K |
|
4747
PUT
Rush Street Interactive
RSI
$3.17B
| $160K | ﹤0.01% |
14,800
+4,800
| +48% | +$46.3K |
|
4748
CALL
Veritone
VERI
$92.9M
| $160K | ﹤0.01% |
44,700
-25,700
| -37% | -$78.5K |
|
4749
Ambev
ABEV
$47.9B
| $159K | ﹤0.01% |
65,514
+50,509
| +337% | +$113K |
|
|
FFWM
4750
PUT
DELISTED
First Foundation Inc
FFWM
| $159K | ﹤0.01% |
25,500
-109,200
| -81% | -$699K |
|
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.