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 | |
|---|---|---|---|---|---|---|
|
NPKI
5051
NPK International
NPKI
$1.09B
| $139K | ﹤0.01% |
21,067
+21,023
| +47,780% | +$147K |
|
5052
CALL
Apogee Enterprises
APOG
$832M
| $138K | ﹤0.01% |
2,600
-800
| -24% | -$37.3K |
|
5053
CALL
AXIS Capital
AXS
$7.64B
| $138K | ﹤0.01% |
2,500
+2,200
| +733% | +$122K |
|
5054
PUT
Avita Medical
RCEL
$133M
| $138K | ﹤0.01% |
10,100
+8,800
| +677% | +$101K |
|
5055
PUT
Transact Technologies
TACT
$50.6M
| $138K | ﹤0.01% |
19,900
| – | – |
|
5056
CALL
Wave Life Sciences
WVE
$1.09B
| $138K | ﹤0.01% |
27,500
+25,800
| +1,518% | +$138K |
|
|
TELL
5057
PUT
DELISTED
Tellurian Inc.
TELL
| $138K | ﹤0.01% |
183,300
+58,400
| +47% | +$41.4K |
|
|
TCN
5058
DELISTED
Tricon Residential Inc.
TCN
| $138K | ﹤0.01% |
15,232
+10,175
| +201% | +$78K |
|
5059
PUT
Brown-Forman Class B
BF.B
$13.2B
| $137K | ﹤0.01% |
+2,400
| New | +$137K |
|
5060
CALL
DHT Holdings
DHT
$3.03B
| $137K | ﹤0.01% |
14,000
-108,700
| -89% | -$1.12M |
|
5061
CALL
Fulcrum Therapeutics
FULC
$237M
| $137K | ﹤0.01% |
20,300
+1,300
| +7% | +$5.77K |
|
5062
Mine Safety
MSA
$7.28B
| $137K | ﹤0.01% |
815
-583
| -42% | -$94.8K |
|
|
REFI
5063
CALL
Chicago Atlantic Real Estate Finance
REFI
$247M
| $137K | ﹤0.01% |
+8,500
| New | +$130K |
|
|
TGH
5064
CALL
DELISTED
Textainer Group Holdings limited
TGH
| $137K | ﹤0.01% |
2,800
+2,600
| +1,300% | +$120K |
|
5065
PUT
Biohaven
BHVN
$2.02B
| $136K | ﹤0.01% |
3,200
-50,200
| -94% | -$1.56M |
|
5066
Bankunited
BKU
$3.33B
| $136K | ﹤0.01% |
4,203
-5,124
| -55% | -$133K |
|
5067
Blend Labs
BLND
$424M
| $136K | ﹤0.01% |
+53,451
| New | +$80.6K |
|
5068
Magnachip Semiconductor
MX
$120M
| $136K | ﹤0.01% |
18,158
+16,223
| +838% | +$119K |
|
5069
CALL
Outfront Media
OUT
$5.59B
| $136K | ﹤0.01% |
+9,957
| New | +$113K |
|
5070
CALL
Travel + Leisure Co
TNL
$4.61B
| $136K | ﹤0.01% |
3,500
-14,500
| -81% | -$526K |
|
5071
PUT
Evolus
EOLS
$383M
| $135K | ﹤0.01% |
12,900
+10,100
| +361% | +$90.3K |
|
5072
PUT
Itron
ITRI
$4.34B
| $135K | ﹤0.01% |
1,800
+1,000
| +125% | +$65K |
|
5073
Alliant Energy
LNT
$18.1B
| $135K | ﹤0.01% |
+2,650
| New | +$132K |
|
5074
PUT
Mercer International
MERC
$39M
| $135K | ﹤0.01% |
+14,300
| New | +$128K |
|
5075
PUT
Grupo Aeroportuario Centro Norte
OMAB
$5.16B
| $135K | ﹤0.01% |
1,600
+1,300
| +433% | +$91.8K |
|
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.