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 | |
|---|---|---|---|---|---|---|
|
PPLI
2426
CALL
People Inc
PPLI
$3.1B
| $1.69M | ﹤0.01% |
38,277
+25,234
| +193% | +$1.05M |
|
2427
Yeti Holdings
YETI
$3.82B
| $1.69M | ﹤0.01% |
+41,182
| New | +$1.62M |
|
2428
CALL
Masco
MAS
$16B
| $1.69M | ﹤0.01% |
20,100
+6,900
| +52% | +$523K |
|
|
BERY
2429
CALL
DELISTED
Berry Global Group, Inc.
BERY
| $1.69M | ﹤0.01% |
27,007
-14,702
| -35% | -$874K |
|
2430
PUT
Harmony Gold Mining
HMY
$9.92B
| $1.68M | ﹤0.01% |
165,500
+24,600
| +17% | +$240K |
|
2431
CALL
Fabrinet
FN
$17.1B
| $1.68M | ﹤0.01% |
7,100
-5,900
| -45% | -$1.37M |
|
2432
Dropbox
DBX
$6.81B
| $1.68M | ﹤0.01% |
+65,944
| New | +$1.55M |
|
2433
PUT
New Oriental
EDU
$7.84B
| $1.68M | ﹤0.01% |
22,100
+6,500
| +42% | +$445K |
|
2434
CALL
Sunoco
SUN
$14.2B
| $1.67M | ﹤0.01% |
31,200
+8,100
| +35% | +$439K |
|
2435
CALL
Sempra
SRE
$60.8B
| $1.67M | ﹤0.01% |
20,000
-19,100
| -49% | -$1.53M |
|
|
MASI
2436
DELISTED
Masimo
MASI
| $1.67M | ﹤0.01% |
12,529
+6,169
| +97% | +$716K |
|
2437
CALL
Rapid7
RPD
$634M
| $1.67M | ﹤0.01% |
41,800
-10,400
| -20% | -$391K |
|
2438
CALL
SLM Corp
SLM
$4.57B
| $1.66M | ﹤0.01% |
72,800
+25,000
| +52% | +$539K |
|
2439
PUT
DHT Holdings
DHT
$2.97B
| $1.66M | ﹤0.01% |
150,800
+130,300
| +636% | +$1.44M |
|
2440
ProShares Ultra QQQ
QLD
$12.5B
| $1.66M | ﹤0.01% |
32,994
+15,546
| +89% | +$746K |
|
2441
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$332M
| $1.66M | ﹤0.01% |
24,992
-6,255
| -20% | -$472K |
|
2442
PUT
TE Connectivity
TEL
$58.8B
| $1.66M | ﹤0.01% |
11,000
-34,900
| -76% | -$5.23M |
|
2443
CALL
Flex
FLEX
$43.4B
| $1.66M | ﹤0.01% |
52,000
-125,000
| -71% | -$3.84M |
|
|
CALY
2444
CALL
Callaway Golf Company
CALY
$3.26B
| $1.66M | ﹤0.01% |
151,000
+49,600
| +49% | +$624K |
|
2445
CALL
Krystal Biotech
KRYS
$9.88B
| $1.66M | ﹤0.01% |
9,100
+8,200
| +911% | +$1.58M |
|
2446
CALL
Opendoor
OPEN
$3.7B
| $1.66M | ﹤0.01% |
855,807
+362,804
| +74% | +$736K |
|
2447
Ardelyx
ARDX
$1.24B
| $1.65M | ﹤0.01% |
240,199
-72,798
| -23% | -$430K |
|
2448
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $1.65M | ﹤0.01% |
2,900
-2,500
| -46% | -$1.38M |
|
2449
Shake Shack
SHAK
$2.3B
| $1.65M | ﹤0.01% |
16,006
+4,971
| +45% | +$479K |
|
2450
CALL
ODDITY Tech
ODD
$708M
| $1.65M | ﹤0.01% |
40,800
+7,300
| +22% | +$281K |
|
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.