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 | |
|---|---|---|---|---|---|---|
2951
PUT
Commercial Metals
CMC
$7.63B
| $1.06M | ﹤0.01% |
21,300
+9,500
| +81% | +$433K |
|
2952
PUT
Celldex Therapeutics
CLDX
$2.77B
| $1.06M | ﹤0.01% |
26,800
+13,600
| +103% | +$400K |
|
2953
PUT
Leidos
LDOS
$14.1B
| $1.06M | ﹤0.01% |
9,800
-9,700
| -50% | -$988K |
|
2954
CALL
Procept Biorobotics
PRCT
$950M
| $1.06M | ﹤0.01% |
25,300
+22,900
| +954% | +$780K |
|
|
AD
2955
Array Digital Infrastructure
AD
$3.02B
| $1.06M | ﹤0.01% |
+25,488
| New | +$1.08M |
|
2956
CALL
Crinetics Pharmaceuticals
CRNX
$8.86B
| $1.06M | ﹤0.01% |
29,700
+300
| +1% | +$9.2K |
|
2957
PUT
Fox Class B
FOX
$20.7B
| $1.06M | ﹤0.01% |
35,800
+7,700
| +27% | +$216K |
|
|
EH
2958
CALL
EHang Holdings
EH
$372M
| $1.05M | ﹤0.01% |
62,700
+24,700
| +65% | +$403K |
|
2959
AST SpaceMobile
ASTS
$16.8B
| $1.05M | ﹤0.01% |
174,540
+88,799
| +104% | +$385K |
|
|
ETNB
2960
CALL
DELISTED
89bio
ETNB
| $1.05M | ﹤0.01% |
94,100
+42,900
| +84% | +$394K |
|
|
SA
2961
CALL
Seabridge Gold
SA
$2.8B
| $1.05M | ﹤0.01% |
86,700
+80,900
| +1,395% | +$930K |
|
2962
McEwen Inc
MUX
$1.03B
| $1.05M | ﹤0.01% |
145,603
+120,705
| +485% | +$873K |
|
2963
CALL
Target Hospitality
TH
$1.61B
| $1.05M | ﹤0.01% |
107,900
-503,000
| -82% | -$6.22M |
|
2964
dLocal
DLO
$4.26B
| $1.05M | ﹤0.01% |
59,246
+35,100
| +145% | +$628K |
|
2965
PUT
Leonardo DRS
DRS
$12.8B
| $1.04M | ﹤0.01% |
52,100
-63,500
| -55% | -$1.2M |
|
|
EH
2966
EHang Holdings
EH
$372M
| $1.04M | ﹤0.01% |
62,113
+42,092
| +210% | +$687K |
|
2967
CALL
Ferguson
FERG
$44.7B
| $1.04M | ﹤0.01% |
5,400
+1,400
| +35% | +$236K |
|
2968
JFrog
FROG
$9.71B
| $1.04M | ﹤0.01% |
30,097
-5,586
| -16% | -$151K |
|
2969
Teladoc Health
TDOC
$1.58B
| $1.04M | ﹤0.01% |
+48,350
| New | +$892K |
|
2970
PUT
Zevra Therapeutics
ZVRA
$563M
| $1.04M | ﹤0.01% |
158,800
+900
| +0.6% | +$4.21K |
|
2971
CALL
Recursion Pharmaceuticals
RXRX
$1.57B
| $1.04M | ﹤0.01% |
105,300
+5,900
| +6% | +$42.1K |
|
2972
PUT
FerroAtlántica
GSM
$628M
| $1.03M | ﹤0.01% |
159,000
+82,200
| +107% | +$435K |
|
2973
PUT
Cincinnati Financial
CINF
$28.3B
| $1.03M | ﹤0.01% |
10,000
+1,200
| +14% | +$122K |
|
2974
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $1.03M | ﹤0.01% |
13,800
+10,200
| +283% | +$214K |
|
2975
CALL
Aviat Networks
AVNW
$262M
| $1.03M | ﹤0.01% |
31,600
+4,000
| +14% | +$119K |
|
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.