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 | |
|---|---|---|---|---|---|---|
5451
PUT
Insperity
NSP
$1.93B
| $79K | ﹤0.01% |
900
| – | – |
|
5452
PG&E
PCG
$38.3B
| $79K | ﹤0.01% |
4,038
-84,799
| -95% | -$1.59M |
|
|
PLYA
5453
DELISTED
Playa Hotels & Resorts
PLYA
| $79K | ﹤0.01% |
10,217
+264
| +3% | +$2.09K |
|
5454
PUT
Protolabs
PRLB
$1.79B
| $79K | ﹤0.01% |
2,700
-400
| -13% | -$12.2K |
|
5455
Prospect Capital
PSEC
$1.07B
| $79K | ﹤0.01% |
+14,878
| New | +$78.9K |
|
5456
CALL
Quanterix
QTRX
$164M
| $79K | ﹤0.01% |
6,100
+3,700
| +154% | +$49.4K |
|
|
WSR
5457
CALL
DELISTED
Whitestone REIT
WSR
| $79K | ﹤0.01% |
5,900
+5,200
| +743% | +$69.8K |
|
5458
Ibotta
IBTA
$559M
| $79K | ﹤0.01% |
1,283
-750
| -37% | -$45.4K |
|
5459
ADS-TEC Energy
ADSE
$968M
| $78K | ﹤0.01% |
+5,863
| New | +$73.3K |
|
|
BELFB
5460
CALL
Bel Fuse Inc Class B
BELFB
$3.87B
| $78K | ﹤0.01% |
1,000
-200
| -17% | -$13.6K |
|
5461
PUT
Biomea Fusion
BMEA
$84.6M
| $78K | ﹤0.01% |
7,800
-16,900
| -68% | -$110K |
|
|
CGAU
5462
CALL
Centerra Gold
CGAU
$3.36B
| $78K | ﹤0.01% |
10,900
-4,900
| -31% | -$33.7K |
|
|
CWAN
5463
CALL
DELISTED
Clearwater Analytics
CWAN
| $78K | ﹤0.01% |
3,100
-27,700
| -90% | -$623K |
|
5464
CALL
Fomento Económico Mexicano
FMX
$43.6B
| $78K | ﹤0.01% |
800
-100
| -11% | -$10.8K |
|
5465
PUT
Ingersoll Rand
IR
$32.6B
| $78K | ﹤0.01% |
800
-9,400
| -92% | -$874K |
|
5466
PUT
Mirum Pharmaceuticals
MIRM
$6.46B
| $78K | ﹤0.01% |
2,000
+600
| +43% | +$23.9K |
|
5467
PUT
National CineMedia
NCMI
$376M
| $78K | ﹤0.01% |
11,100
+100
| +0.9% | +$611 |
|
5468
Ocular Therapeutix
OCUL
$1.79B
| $78K | ﹤0.01% |
9,042
-13,900
| -61% | -$115K |
|
5469
PUT
ReNew
RNW
$2.27B
| $78K | ﹤0.01% |
12,500
-4,500
| -26% | -$26.7K |
|
5470
PUT
STAG Industrial
STAG
$7.38B
| $78K | ﹤0.01% |
2,000
-18,400
| -90% | -$721K |
|
5471
CALL
Timberland Bancorp
TSBK
$348M
| $78K | ﹤0.01% |
2,600
| – | – |
|
5472
Taysha Gene Therapies
TSHA
$1.68B
| $78K | ﹤0.01% |
+38,813
| New | +$85.2K |
|
|
TSVT
5473
CALL
DELISTED
2seventy bio
TSVT
| $78K | ﹤0.01% |
16,600
-1,200
| -7% | -$5.41K |
|
5474
CALL
Artisan Partners
APAM
$2.79B
| $77K | ﹤0.01% |
1,800
-20,900
| -92% | -$863K |
|
|
ARIS
5475
CALL
DELISTED
Aris Water Solutions
ARIS
| $77K | ﹤0.01% |
4,600
+4,100
| +820% | +$66.4K |
|
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.