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 | |
|---|---|---|---|---|---|---|
4101
CALL
Vanguard Total Bond Market
BND
$158B
| $307K | ﹤0.01% |
4,100
-15,200
| -79% | -$1.12M |
|
4102
PUT
Fortuna Silver Mines
FSM
$2.55B
| $307K | ﹤0.01% |
66,500
-15,300
| -19% | -$72.6K |
|
4103
PUT
Intrepid Potash
IPI
$474M
| $307K | ﹤0.01% |
12,800
-4,900
| -28% | -$117K |
|
4104
PUT
Marten Transport
MRTN
$1.25B
| $307K | ﹤0.01% |
17,400
+1,600
| +10% | +$28.1K |
|
4105
Syndax Pharmaceuticals
SNDX
$1.74B
| $307K | ﹤0.01% |
15,980
+10,107
| +172% | +$209K |
|
4106
CALL
Vicor
VICR
$8.76B
| $307K | ﹤0.01% |
7,300
+3,100
| +74% | +$115K |
|
4107
BGC Group
BGC
$5.73B
| $306K | ﹤0.01% |
+33,346
| New | +$312K |
|
4108
CALL
CrossAmerica Partners
CAPL
$839M
| $306K | ﹤0.01% |
14,800
+200
| +1% | +$4.01K |
|
4109
PUT
Advanced Energy
AEIS
$10.9B
| $305K | ﹤0.01% |
2,900
+2,700
| +1,350% | +$283K |
|
4110
PUT
Howard Hughes
HHH
$4B
| $305K | ﹤0.01% |
12,000
+2,454
| +26% | +$173K |
|
4111
Oscar Health
OSCR
$9.47B
| $305K | ﹤0.01% |
14,384
-73,736
| -84% | -$1.33M |
|
4112
CALL
Ryan Specialty Holdings
RYAN
$5.96B
| $305K | ﹤0.01% |
4,600
-3,100
| -40% | -$194K |
|
4113
PUT
Annexon
ANNX
$814M
| $304K | ﹤0.01% |
51,400
-477,200
| -90% | -$2.83M |
|
4114
PUT
BBVA Argentina
BBAR
$3.85B
| $304K | ﹤0.01% |
29,400
-6,300
| -18% | -$61.8K |
|
4115
PUT
Genius Sports
GENI
$1.95B
| $304K | ﹤0.01% |
38,900
+32,500
| +508% | +$226K |
|
|
4116
Howard Hughes
HHH
$4B
| $304K | ﹤0.01% |
+3,934
| New | +$278K |
|
4117
CALL
International Seaways
INSW
$4.63B
| $304K | ﹤0.01% |
5,900
+2,500
| +74% | +$132K |
|
|
SVM
4118
CALL
Silvercorp Metals
SVM
$2.08B
| $304K | ﹤0.01% |
69,600
+57,600
| +480% | +$214K |
|
|
YALA
4119
Yalla Group
YALA
$824M
| $304K | ﹤0.01% |
66,999
+33,564
| +100% | +$141K |
|
4120
Casey's General Stores
CASY
$31.7B
| $303K | ﹤0.01% |
808
-73
| -8% | -$27.3K |
|
|
DQ
4121
Daqo New Energy
DQ
$802M
| $303K | ﹤0.01% |
14,905
+10,991
| +281% | +$177K |
|
4122
PUT
Monro
MNRO
$537M
| $303K | ﹤0.01% |
10,500
+9,500
| +950% | +$246K |
|
4123
PUT
Phreesia
PHR
$671M
| $303K | ﹤0.01% |
13,300
+4,900
| +58% | +$115K |
|
4124
PUT
Bio-Techne
TECH
$11.2B
| $303K | ﹤0.01% |
3,800
-8,600
| -69% | -$646K |
|
4125
CALL
CONMED
CNMD
$1.33B
| $302K | ﹤0.01% |
4,200
+2,700
| +180% | +$191K |
|
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.