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 | |
|---|---|---|---|---|---|---|
|
IAS
5601
CALL
DELISTED
Integral Ad Science
IAS
| $68K | ﹤0.01% |
6,300
-1,900
| -23% | -$20.4K |
|
5602
CALL
International General Insurance
IGIC
$1.19B
| $68K | ﹤0.01% |
3,600
+3,300
| +1,100% | +$55.5K |
|
|
PPTA
5603
CALL
Perpetua Resources
PPTA
$2.3B
| $68K | ﹤0.01% |
7,300
-61,600
| -89% | -$457K |
|
5604
CALL
Sylvamo
SLVM
$1.49B
| $68K | ﹤0.01% |
800
-1,400
| -64% | -$105K |
|
5605
PUT
Vanguard FTSE Developed Markets ETF
VEA
$229B
| $68K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$61K |
|
5606
CALL
VistaGen Therapeutics
VTGN
$9.89M
| $68K | ﹤0.01% |
22,900
-72,600
| -76% | -$248K |
|
|
PSTX
5607
CALL
DELISTED
Poseida Therapeutics, Inc. Common Stock
PSTX
| $68K | ﹤0.01% |
24,000
+11,600
| +94% | +$35.9K |
|
5608
CALL
American Financial Group
AFG
$11.8B
| $67K | ﹤0.01% |
500
| – | – |
|
5609
PUT
Aquestive Therapeutics
AQST
$464M
| $67K | ﹤0.01% |
13,500
-2,300
| -15% | -$8.95K |
|
5610
Cars.com
CARS
$662M
| $67K | ﹤0.01% |
+4,002
| New | +$72.9K |
|
5611
CALL
Cerus
CERS
$433M
| $67K | ﹤0.01% |
38,700
+37,500
| +3,125% | +$78.7K |
|
5612
PUT
Daktronics
DAKT
$955M
| $67K | ﹤0.01% |
5,200
+600
| +13% | +$8.29K |
|
5613
ProShares Ultra Dow30
DDM
$542M
| $67K | ﹤0.01% |
1,406
-3,186
| -69% | -$141K |
|
5614
CALL
Enova International
ENVA
$6.33B
| $67K | ﹤0.01% |
+800
| New | +$62K |
|
5615
PUT
GXO Logistics
GXO
$5.77B
| $67K | ﹤0.01% |
1,300
-2,500
| -66% | -$127K |
|
5616
CALL
Kemper
KMPR
$1.67B
| $67K | ﹤0.01% |
1,100
-3,700
| -77% | -$227K |
|
5617
CALL
Kornit Digital
KRNT
$705M
| $67K | ﹤0.01% |
2,600
-1,300
| -33% | -$23.9K |
|
|
5618
Kornit Digital
KRNT
$705M
| $67K | ﹤0.01% |
2,605
-2,770
| -52% | -$51K |
|
5619
MannKind Corp
MNKD
$1.21B
| $67K | ﹤0.01% |
10,806
-33,697
| -76% | -$194K |
|
5620
PUT
Oceaneering
OII
$4.86B
| $67K | ﹤0.01% |
2,700
-7,100
| -72% | -$183K |
|
5621
CALL
SkinHealth Systems
SKIN
$88.8M
| $67K | ﹤0.01% |
46,900
-14,400
| -23% | -$23.6K |
|
5622
CALL
Millicom
TIGO
$16B
| $67K | ﹤0.01% |
2,500
+2,100
| +525% | +$54.2K |
|
5623
CALL
VTEX
VTEX
$735M
| $67K | ﹤0.01% |
9,100
-3,600
| -28% | -$25K |
|
5624
PUT
Arbutus Biopharma
ABUS
$857M
| $66K | ﹤0.01% |
17,400
+2,600
| +18% | +$9.97K |
|
5625
CALL
ASE Group
ASX
$77.3B
| $66K | ﹤0.01% |
6,800
-20,500
| -75% | -$208K |
|
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.