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 | |
|---|---|---|---|---|---|---|
3476
CALL
OSI Systems
OSIS
$3.58B
| $561K | ﹤0.01% |
3,700
-1,600
| -30% | -$230K |
|
3477
CALL
RCI Hospitality Holdings
RICK
$201M
| $561K | ﹤0.01% |
12,600
+3,900
| +45% | +$175K |
|
3478
Upwork
UPWK
$1.14B
| $561K | ﹤0.01% |
53,774
+29,082
| +118% | +$303K |
|
|
GOOS
3479
PUT
Canada Goose Holdings
GOOS
$891M
| $560K | ﹤0.01% |
44,700
-46,500
| -51% | -$527K |
|
3480
MSC Industrial Direct
MSM
$7.07B
| $560K | ﹤0.01% |
6,511
-7,338
| -53% | -$600K |
|
3481
Sphere Entertainment
SPHR
$5.01B
| $560K | ﹤0.01% |
12,690
-3,309
| -21% | -$142K |
|
3482
Invesco S&P 500 Top 50 ETF
XLG
$10.4B
| $560K | ﹤0.01% |
11,793
+6,044
| +105% | +$278K |
|
3483
Albertsons Companies
ACI
$5.57B
| $559K | ﹤0.01% |
30,275
+18,217
| +151% | +$356K |
|
3484
PUT
Gaotu Techedu
GOTU
$374M
| $559K | ﹤0.01% |
142,800
-17,800
| -11% | -$72.8K |
|
3485
PUT
Avient
AVNT
$3.34B
| $558K | ﹤0.01% |
11,100
+10,300
| +1,288% | +$472K |
|
|
SERV
3486
Serve Robotics
SERV
$407M
| $558K | ﹤0.01% |
+70,229
| New | +$606K |
|
3487
Clean Energy Fuels
CLNE
$432M
| $556K | ﹤0.01% |
178,879
+4,682
| +3% | +$13.3K |
|
3488
Dine Brands
DIN
$448M
| $556K | ﹤0.01% |
17,815
+10,875
| +157% | +$350K |
|
3489
PUT
MaxLinear
MXL
$5.88B
| $556K | ﹤0.01% |
38,400
+28,200
| +276% | +$448K |
|
3490
PUT
OneSpan
OSPN
$562M
| $555K | ﹤0.01% |
33,300
+11,800
| +55% | +$175K |
|
3491
PUT
Ultragenyx Pharmaceutical
RARE
$2.65B
| $555K | ﹤0.01% |
10,000
+1,100
| +12% | +$56K |
|
3492
PUT
Cars.com
CARS
$660M
| $554K | ﹤0.01% |
33,100
+29,600
| +846% | +$539K |
|
3493
PUT
Ternium
TX
$9.37B
| $553K | ﹤0.01% |
15,000
| – | – |
|
3494
Western Union
WU
$2.55B
| $552K | ﹤0.01% |
46,318
+25,991
| +128% | +$313K |
|
3495
Alight
ALIT
$520M
| $551K | ﹤0.01% |
+3,727
| New | +$535K |
|
3496
CALL
NewMarket
NEU
$7.13B
| $551K | ﹤0.01% |
+1,000
| New | +$548K |
|
|
RC
3497
CALL
Ready Capital
RC
$265M
| $550K | ﹤0.01% |
72,100
+31,800
| +79% | +$270K |
|
3498
CALL
SFL Corp
SFL
$1.59B
| $548K | ﹤0.01% |
47,400
+20,400
| +76% | +$244K |
|
3499
CALL
Rush Street Interactive
RSI
$3.26B
| $547K | ﹤0.01% |
50,500
-31,000
| -38% | -$299K |
|
|
FLG
3500
CALL
Flagstar Bank National Association
FLG
$5.74B
| $547K | ﹤0.01% |
1,318,900
+821,733
| +165% | +$8.74M |
|
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.