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 | |
|---|---|---|---|---|---|---|
6976
PUT
Kopin
KOPN
$645M
| $12K | ﹤0.01% |
+13,900
| New | +$20.4K |
|
|
KREF
6977
CALL
KKR Real Estate Finance Trust
KREF
$469M
| $12K | ﹤0.01% |
1,200
-2,900
| -71% | -$31.2K |
|
6978
iShares MSCI Saudi Arabia ETF
KSA
$622M
| $12K | ﹤0.01% |
293
-135
| -32% | -$5.59K |
|
6979
CALL
Alliant Energy
LNT
$19.1B
| $12K | ﹤0.01% |
200
-2,500
| -93% | -$153K |
|
6980
PUT
MarketWise
MKTW
$54.5M
| $12K | ﹤0.01% |
315
+85
| +37% | +$1.02K |
|
|
MLGO
6981
PUT
MicroAlgo
MLGO
$46.2M
| $12K | ﹤0.01% |
+17
| New | +$2.03K |
|
|
ORC
6982
Orchid Island Capital
ORC
$1.31B
| $12K | ﹤0.01% |
1,613
-57,652
| -97% | -$474K |
|
6983
CALL
Pacira BioSciences
PCRX
$1.06B
| $12K | ﹤0.01% |
500
-10,600
| -95% | -$254K |
|
6984
CALL
Prudential
PUK
$36.1B
| $12K | ﹤0.01% |
600
+400
| +200% | +$7.16K |
|
|
RPC
6985
PUT
Ridgepost Capital
RPC
$978M
| $12K | ﹤0.01% |
1,100
| – | – |
|
6986
LiveRamp
RAMP
$2.3B
| $12K | ﹤0.01% |
+471
| New | +$14.4K |
|
|
RPTX
6987
DELISTED
Repare Therapeutics
RPTX
| $12K | ﹤0.01% |
12,781
-5,578
| -30% | -$6.72K |
|
6988
PUT
RxSight
RXST
$246M
| $12K | ﹤0.01% |
500
+200
| +67% | +$5.94K |
|
|
SHYF
6989
PUT
DELISTED
The Shyft Group
SHYF
| $12K | ﹤0.01% |
+1,500
| New | +$16.1K |
|
6990
PUT
Siebert Financial
SIEB
$66.3M
| $12K | ﹤0.01% |
4,100
| – | – |
|
6991
Direxion Daily S&P 500 Bear 1X ETF
SPDN
$222M
| $12K | ﹤0.01% |
+1,100
| New | +$12.2K |
|
6992
CALL
Savers
SVV
$1.57B
| $12K | ﹤0.01% |
1,800
-1,600
| -47% | -$14.8K |
|
6993
TaskUs
TASK
$568M
| $12K | ﹤0.01% |
952
+337
| +55% | +$5.07K |
|
6994
TFS Financial
TFSL
$5.17B
| $12K | ﹤0.01% |
983
-717
| -42% | -$9.18K |
|
6995
TriMas Corp
TRS
$1.44B
| $12K | ﹤0.01% |
+524
| New | +$12.4K |
|
6996
PUT
Universal Technical Institute
UTI
$2.13B
| $12K | ﹤0.01% |
500
-1,100
| -69% | -$29.7K |
|
6997
VOC Energy
VOC
$58M
| $12K | ﹤0.01% |
+3,830
| New | +$14.6K |
|
|
WIMI
6998
PUT
WiMi Hologram Cloud
WIMI
$21M
| $12K | ﹤0.01% |
1,320
-1,520
| -54% | -$14.5K |
|
6999
Invesco S&P MidCap Momentum ETF
XMMO
$7.15B
| $12K | ﹤0.01% |
110
-106
| -49% | -$13.1K |
|
7000
CALL
ZipRecruiter
ZIP
$360M
| $12K | ﹤0.01% |
+2,100
| New | +$14K |
|
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.