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 | |
|---|---|---|---|---|---|---|
7426
PUT
Mercury Systems
MRCY
$6.2B
| $10K | ﹤0.01% |
300
-100
| -25% | -$3.61K |
|
7427
PUT
LHA Market State Tactical Beta ETF
MSTB
$191M
| $10K | ﹤0.01% |
+1,600
| New | +$43.2K |
|
7428
MaxCyte
MXCT
$116M
| $10K | ﹤0.01% |
2,327
+1,757
| +308% | +$6.84K |
|
7429
Vitamin Cottage Natural Grocers
NGVC
$691M
| $10K | ﹤0.01% |
642
+572
| +817% | +$8.32K |
|
|
NIU
7430
PUT
Niu Technologies
NIU
$202M
| $10K | ﹤0.01% |
4,900
+1,400
| +40% | +$3.2K |
|
7431
PUT
Nomad Foods
NOMD
$1.64B
| $10K | ﹤0.01% |
+600
| New | +$9.29K |
|
7432
PUT
Patrick Industries
PATK
$2.8B
| $10K | ﹤0.01% |
150
-5,400
| -97% | -$296K |
|
7433
Paysign
PAYS
$486M
| $10K | ﹤0.01% |
3,674
-8,001
| -69% | -$17.6K |
|
7434
PUT
Phillips Edison & Co
PECO
$5.48B
| $10K | ﹤0.01% |
+300
| New | +$10.5K |
|
|
PHX
7435
DELISTED
PHX Minerals
PHX
| $10K | ﹤0.01% |
3,264
-469
| -13% | -$1.61K |
|
7436
PUT
PJT Partners
PJT
$4.37B
| $10K | ﹤0.01% |
100
| – | – |
|
7437
PUT
Porch Group
PRCH
$1.3B
| $10K | ﹤0.01% |
+3,400
| New | +$4.78K |
|
7438
CALL
Perdoceo Education
PRDO
$1.9B
| $10K | ﹤0.01% |
600
-400
| -40% | -$7.05K |
|
7439
CALL
Perimeter Solutions
PRM
$5.5B
| $10K | ﹤0.01% |
2,200
-600
| -21% | -$2.3K |
|
|
RPC
7440
CALL
Ridgepost Capital
RPC
$927M
| $10K | ﹤0.01% |
1,000
+700
| +233% | +$6.91K |
|
7441
PUT
D-Wave Quantum
QBTS
$6B
| $10K | ﹤0.01% |
11,800
-72,300
| -86% | -$64.1K |
|
7442
CALL
Quanterix
QTRX
$173M
| $10K | ﹤0.01% |
400
-1,000
| -71% | -$23.5K |
|
7443
Splash Beverage Group
SBEV
| $10K | ﹤0.01% |
471
-18
| -4% | -$428 |
|
7444
PUT
Scilex Holding
SCLX
$48.1M
| $10K | ﹤0.01% |
143
-197
| -58% | -$10.2K |
|
7445
PUT
Vivid Seats
SEAT
$77M
| $10K | ﹤0.01% |
85
-50
| -37% | -$6.85K |
|
7446
Shenandoah Telecom
SHEN
$632M
| $10K | ﹤0.01% |
+486
| New | +$10.9K |
|
7447
CALL
Seanergy Maritime Holdings
SHIP
$351M
| $10K | ﹤0.01% |
1,300
-200
| -13% | -$1.25K |
|
7448
Solid Power
SLDP
$468M
| $10K | ﹤0.01% |
7,317
+142
| +2% | +$213 |
|
7449
PUT
1st Source
SRCE
$2.07B
| $10K | ﹤0.01% |
+200
| New | +$9.59K |
|
7450
CALL
BlackRock TCP Capital
TCPC
$265M
| $10K | ﹤0.01% |
+900
| New | +$10.2K |
|
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.