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 | |
|---|---|---|---|---|---|---|
7576
CALL
Knowles
KN
$3.22B
| $8K | ﹤0.01% |
500
-100
| -17% | -$1.55K |
|
7577
Kodiak Sciences
KOD
$2.59B
| $8K | ﹤0.01% |
2,896
+2,694
| +1,334% | +$5.99K |
|
7578
CALL
KORU Medical Systems
KRMD
$176M
| $8K | ﹤0.01% |
+3,600
| New | +$8.57K |
|
7579
PUT
Leslie's
LESL
$11.6M
| $8K | ﹤0.01% |
60
+15
| +33% | +$1.65K |
|
7580
PUT
Limoneira
LMNR
$237M
| $8K | ﹤0.01% |
+400
| New | +$6.47K |
|
7581
LG Display
LPL
$3.17B
| $8K | ﹤0.01% |
1,660
+38
| +2% | +$181 |
|
|
LSEA
7582
DELISTED
Landsea Homes
LSEA
| $8K | ﹤0.01% |
633
-5,743
| -90% | -$55.5K |
|
7583
MacroGenics
MGNX
$235M
| $8K | ﹤0.01% |
916
-6,824
| -88% | -$47.2K |
|
7584
MarketWise
MKTW
$53.1M
| $8K | ﹤0.01% |
157
-33
| -17% | -$1.61K |
|
|
MODV
7585
CALL
DELISTED
ModivCare
MODV
| $8K | ﹤0.01% |
200
+100
| +100% | +$3.95K |
|
7586
PUT
MaxCyte
MXCT
$116M
| $8K | ﹤0.01% |
1,900
+1,100
| +138% | +$4.28K |
|
7587
YieldMax NFLX Option Income Strategy ETF
NFLY
$38.7M
| $8K | ﹤0.01% |
+459
| New | +$8.11K |
|
7588
CALL
NMI Holdings
NMIH
$3.25B
| $8K | ﹤0.01% |
300
-300
| -50% | -$8.37K |
|
7589
PUT
OmniAb
OABI
$294M
| $8K | ﹤0.01% |
1,300
+800
| +160% | +$3.93K |
|
7590
Patria Investments
PAX
$1.72B
| $8K | ﹤0.01% |
+572
| New | +$8.12K |
|
7591
PUT
Paymentus
PAY
$3.63B
| $8K | ﹤0.01% |
+500
| New | +$8.16K |
|
7592
CALL
Post Holdings
POST
$4.12B
| $8K | ﹤0.01% |
100
-2,100
| -95% | -$178K |
|
7593
CALL
Quantum Computing Inc
QUBT
$1.68B
| $8K | ﹤0.01% |
9,300
-2,400
| -21% | -$2.06K |
|
7594
Rekor Systems
REKR
$83.8M
| $8K | ﹤0.01% |
+2,638
| New | +$7.52K |
|
|
RINC
7595
DELISTED
AXS Real Estate Income ETF
RINC
| $8K | ﹤0.01% |
+320
| New | +$7.61K |
|
7596
PUT
Simulations Plus
SLP
$371M
| $8K | ﹤0.01% |
200
+100
| +100% | +$3.96K |
|
7597
Invesco S&P 500 GARP ETF
SPGP
$2.18B
| $8K | ﹤0.01% |
+88
| New | +$8.13K |
|
7598
Cambria Tail Risk ETF
TAIL
$145M
| $8K | ﹤0.01% |
691
+225
| +48% | +$2.88K |
|
7599
PUT
Tarsus Pharmaceuticals
TARS
$2.56B
| $8K | ﹤0.01% |
400
-600
| -60% | -$10K |
|
7600
ThredUp
TDUP
$736M
| $8K | ﹤0.01% |
+3,564
| New | +$9.26K |
|
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.