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 | |
|---|---|---|---|---|---|---|
|
SCS
3701
DELISTED
Steelcase
SCS
| $378K | ﹤0.01% |
34,533
+33,829
| +4,805% | +$390K |
|
|
JBTM
3702
CALL
JBT Marel
JBTM
$7.59B
| $378K | ﹤0.01% |
3,100
-14,500
| -82% | -$1.84M |
|
3703
Ambev
ABEV
$48.4B
| $377K | ﹤0.01% |
162,223
-8,491
| -5% | -$17K |
|
3704
CALL
Crescent Energy
CRGY
$3.44B
| $377K | ﹤0.01% |
33,600
+9,900
| +42% | +$136K |
|
3705
PUT
Installed Building Products
IBP
$6.47B
| $377K | ﹤0.01% |
2,200
+1,800
| +450% | +$325K |
|
|
KOCG
3706
CALL
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $377K | ﹤0.01% |
7,900
-6,300
| -44% | -$181K |
|
|
SJT
3707
San Juan Basin Royalty Trust
SJT
$117M
| $377K | ﹤0.01% |
68,180
+44,986
| +194% | +$212K |
|
3708
DigitalBridge
DBRG
$2.93B
| $376K | ﹤0.01% |
42,709
-6,890
| -14% | -$72.4K |
|
3709
PUT
Absci
ABSI
$1.21B
| $375K | ﹤0.01% |
149,500
+141,700
| +1,817% | +$520K |
|
3710
PUT
Federal Agricultural Mortgage Class A
AGM.A
$1.62B
| $375K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$281K |
|
3711
CALL
Equitable Holdings
EQH
$13.5B
| $375K | ﹤0.01% |
7,200
+6,300
| +700% | +$330K |
|
3712
PUT
Akebia Therapeutics
AKBA
$341M
| $374K | ﹤0.01% |
195,100
+60,000
| +44% | +$122K |
|
3713
CALL
Haleon
HLN
$45.2B
| $374K | ﹤0.01% |
36,400
-46,500
| -56% | -$458K |
|
3714
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $374K | ﹤0.01% |
+702
| New | +$398K |
|
3715
PUT
Penske Automotive Group
PAG
$14.5B
| $374K | ﹤0.01% |
2,600
-11,300
| -81% | -$1.81M |
|
3716
PUT
United Bankshares
UBSI
$6.71B
| $374K | ﹤0.01% |
10,800
+5,100
| +89% | +$187K |
|
3717
Designer Brands
DBI
$322M
| $373K | ﹤0.01% |
102,210
+90,690
| +787% | +$426K |
|
3718
PUT
nCino
NCNO
$2.03B
| $373K | ﹤0.01% |
13,600
+1,400
| +11% | +$44.3K |
|
3719
CALL
Taboola.com
TBLA
$1.37B
| $373K | ﹤0.01% |
126,500
-800
| -0.6% | -$2.73K |
|
3720
Caleres
CAL
$447M
| $372K | ﹤0.01% |
21,621
+19,310
| +836% | +$347K |
|
3721
PUT
Invitation Homes
INVH
$17.9B
| $372K | ﹤0.01% |
10,700
-115,200
| -92% | -$3.72M |
|
3722
CALL
Delcath Systems
DCTH
$399M
| $371K | ﹤0.01% |
29,200
+19,100
| +189% | +$271K |
|
3723
MBIA
MBI
$278M
| $371K | ﹤0.01% |
74,531
-63,349
| -46% | -$392K |
|
3724
PUT
MillerKnoll
MLKN
$1.61B
| $371K | ﹤0.01% |
19,400
+16,600
| +593% | +$353K |
|
3725
PUT
REX American Resources
REX
$1.4B
| $371K | ﹤0.01% |
19,800
+19,600
| +9,800% | +$393K |
|
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.