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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2701
PUT
Telephone and Data Systems
TDS
$3.91B
| $1.38M | ﹤0.01% |
75,200
-16,900
| -18% | -$312K |
|
2702
PUT
Jones Lang LaSalle
JLL
$15.1B
| $1.38M | ﹤0.01% |
7,300
-1,300
| -15% | -$197K |
|
2703
Amkor Technology
AMKR
$16.1B
| $1.38M | ﹤0.01% |
+41,405
| New | +$1.09M |
|
2704
PUT
Jackson Financial
JXN
$8.32B
| $1.38M | ﹤0.01% |
26,900
+3,000
| +13% | +$132K |
|
|
LUCK
2705
CALL
Lucky Strike Entertainment
LUCK
$938M
| $1.38M | ﹤0.01% |
97,300
+41,200
| +73% | +$452K |
|
2706
PUT
Axsome Therapeutics
AXSM
$12.4B
| $1.38M | ﹤0.01% |
17,300
+4,600
| +36% | +$308K |
|
2707
PUT
BlackLine
BL
$1.69B
| $1.37M | ﹤0.01% |
22,000
+15,200
| +224% | +$859K |
|
2708
CALL
Parsons
PSN
$6.28B
| $1.37M | ﹤0.01% |
21,900
+11,500
| +111% | +$695K |
|
2709
PUT
Shutterstock
SSTK
$205M
| $1.37M | ﹤0.01% |
28,400
+17,200
| +154% | +$726K |
|
2710
CALL
Enterprise Financial Services Corp
EFSC
$2.41B
| $1.37M | ﹤0.01% |
+30,700
| New | +$1.2M |
|
2711
PUT
FT Vest Gold Strategy Target Income ETF
IGLD
$507M
| $1.37M | ﹤0.01% |
8,300
-8,800
| -51% | -$164K |
|
2712
CALL
Arcturus Therapeutics
ARCT
$157M
| $1.37M | ﹤0.01% |
43,400
+24,300
| +127% | +$578K |
|
2713
Vanguard Value ETF
VTV
$189B
| $1.37M | ﹤0.01% |
+9,147
| New | +$1.29M |
|
2714
Radware
RDWR
$1.24B
| $1.36M | ﹤0.01% |
81,811
+52,332
| +178% | +$831K |
|
2715
PUT
Blink Charging
BLNK
$75.2M
| $1.36M | ﹤0.01% |
402,000
+179,100
| +80% | +$559K |
|
|
INBX
2716
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $1.36M | ﹤0.01% |
35,861
+35,225
| +5,539% | +$755K |
|
2717
BJ's Restaurants
BJRI
$1.41B
| $1.36M | ﹤0.01% |
37,822
+33,715
| +821% | +$959K |
|
|
OPRA
2718
CALL
Opera Ltd
OPRA
$1.65B
| $1.36M | ﹤0.01% |
102,900
+82,400
| +402% | +$974K |
|
2719
Canadian National Railway
CNI
$78.3B
| $1.36M | ﹤0.01% |
10,816
+6,750
| +166% | +$765K |
|
2720
CALL
Bio-Rad Laboratories Class A
BIO
$8.42B
| $1.36M | ﹤0.01% |
4,200
-4,500
| -52% | -$1.41M |
|
2721
CALL
FerroAtlántica
GSM
$628M
| $1.36M | ﹤0.01% |
208,300
-367,600
| -64% | -$1.94M |
|
2722
CALL
Brookdale Senior Living
BKD
$3.62B
| $1.35M | ﹤0.01% |
232,900
+200,400
| +617% | +$940K |
|
2723
CALL
Marqeta
MQ
$1.8B
| $1.35M | ﹤0.01% |
48,550
-4,175
| -8% | -$100K |
|
2724
PUT
Tidewater
TDW
$3.91B
| $1.35M | ﹤0.01% |
18,800
-10,100
| -35% | -$654K |
|
2725
CALL
Establishment Labs
ESTA
$2.72B
| $1.35M | ﹤0.01% |
52,300
+16,800
| +47% | +$492K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.