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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CIM
3726
CALL
Chimera Investment
CIM
$1.06B
| $370K | ﹤0.01% |
28,900
+1,700
| +6% | +$23.9K |
|
3727
Old Dominion Freight Line
ODFL
$47.1B
| $370K | ﹤0.01% |
2,238
+468
| +26% | +$85.1K |
|
3728
CALL
Snap-on
SNA
$21.7B
| $370K | ﹤0.01% |
1,100
-2,800
| -72% | -$952K |
|
3729
PUT
Trane Technologies
TT
$104B
| $370K | ﹤0.01% |
1,100
-27,900
| -96% | -$10.1M |
|
3730
CALL
Zymeworks
ZYME
$1.66B
| $370K | ﹤0.01% |
31,100
+30,700
| +7,675% | +$419K |
|
3731
PUT
SoundThinking
SSTI
$110M
| $369K | ﹤0.01% |
21,800
+19,300
| +772% | +$286K |
|
3732
Warrior Met Coal
HCC
$4.17B
| $368K | ﹤0.01% |
+7,716
| New | +$394K |
|
3733
CALL
Global X S&P 500 Tail Risk ETF
XTR
$4.78M
| $368K | ﹤0.01% |
14,100
-8,200
| -37% | -$225K |
|
3734
CALL
Amplitude
AMPL
$1.16B
| $367K | ﹤0.01% |
36,100
+26,100
| +261% | +$308K |
|
3735
CALL
FT Vest Gold Strategy Target Income ETF
IGLD
$505M
| $366K | ﹤0.01% |
4,400
-1,000
| -19% | -$19.8K |
|
3736
Ocular Therapeutix
OCUL
$1.85B
| $366K | ﹤0.01% |
49,962
-43,511
| -47% | -$334K |
|
3737
Rithm Capital
RITM
$5.46B
| $366K | ﹤0.01% |
31,968
-130,432
| -80% | -$1.51M |
|
3738
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$47.1B
| $365K | ﹤0.01% |
3,988
-1,040
| -21% | -$95.3K |
|
3739
Loews
L
$24.6B
| $365K | ﹤0.01% |
+3,976
| New | +$340K |
|
3740
CALL
Lifestance Health
LFST
$4.29B
| $365K | ﹤0.01% |
204,900
+36,900
| +22% | +$281K |
|
3741
CALL
Dorian LPG
LPG
$1.9B
| $364K | ﹤0.01% |
16,300
+11,500
| +240% | +$266K |
|
3742
TPG
TPG
$7.02B
| $364K | ﹤0.01% |
7,688
+7,425
| +2,823% | +$433K |
|
|
TTAN
3743
ServiceTitan Inc
TTAN
$7.48B
| $364K | ﹤0.01% |
+3,831
| New | +$372K |
|
|
MOMO
3744
CALL
Hello Group
MOMO
$869M
| $363K | ﹤0.01% |
57,600
-269,200
| -82% | -$1.94M |
|
3745
CALL
Natural Resource Partners
NRP
$1.32B
| $363K | ﹤0.01% |
3,500
+1,600
| +84% | +$168K |
|
|
MRP
3746
CALL
Millrose Properties Inc
MRP
$4.75B
| $363K | ﹤0.01% |
+13,700
| New | +$321K |
|
3747
PUT
Navios Maritime Partners
NMM
$2.25B
| $360K | ﹤0.01% |
9,200
-34,600
| -79% | -$1.46M |
|
3748
CALL
UL Solutions
ULS
$18.5B
| $360K | ﹤0.01% |
+6,400
| New | +$340K |
|
3749
Bausch + Lomb
BLCO
$5.92B
| $359K | ﹤0.01% |
24,795
-44,057
| -64% | -$724K |
|
3750
PUT
Navient
NAVI
$822M
| $358K | ﹤0.01% |
28,400
-2,000
| -7% | -$27.3K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.