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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4926
PUT
Finance of America Companies
FOA
$222M
| $135K | ﹤0.01% |
5,800
+5,600
| +2,800% | +$118K |
|
4927
CALL
Gaotu Techedu
GOTU
$405M
| $135K | ﹤0.01% |
37,400
-24,900
| -40% | -$85.4K |
|
|
NB
4928
PUT
NioCorp Developments
NB
$562M
| $135K | ﹤0.01% |
58,100
+56,900
| +4,742% | +$142K |
|
|
OLO
4929
DELISTED
Olo Inc
OLO
| $135K | ﹤0.01% |
15,199
+11,680
| +332% | +$90.6K |
|
4930
CALL
Odyssey Marine Exploration
OMEX
$37.7M
| $135K | ﹤0.01% |
115,100
+51,600
| +81% | +$47K |
|
4931
PUT
Pacific Biosciences
PACB
$435M
| $135K | ﹤0.01% |
109,400
+45,600
| +71% | +$52.7K |
|
4932
CALL
Plexus
PLXS
$6.43B
| $135K | ﹤0.01% |
1,000
+500
| +100% | +$64.1K |
|
4933
CALL
Revvity
RVTY
$12.6B
| $135K | ﹤0.01% |
1,400
+1,200
| +600% | +$113K |
|
|
4934
PUT
Revvity
RVTY
$12.6B
| $135K | ﹤0.01% |
+1,400
| New | +$132K |
|
4935
TTM Technologies
TTMI
$10.6B
| $135K | ﹤0.01% |
+3,327
| New | +$92K |
|
|
ZK
4936
PUT
DELISTED
Zeekr
ZK
| $135K | ﹤0.01% |
5,300
-45,100
| -89% | -$1.11M |
|
4937
PUT
Blackbaud
BLKB
$1.94B
| $134K | ﹤0.01% |
2,100
+1,700
| +425% | +$106K |
|
4938
Clear Channel Outdoor Holdings
CCO
$1.22B
| $134K | ﹤0.01% |
115,011
+114,898
| +101,680% | +$124K |
|
|
DENN
4939
DELISTED
Denny's
DENN
| $134K | ﹤0.01% |
32,921
-11,085
| -25% | -$42.5K |
|
4940
Fiverr
FVRR
$331M
| $134K | ﹤0.01% |
4,585
+1,159
| +34% | +$33.3K |
|
4941
CALL
Geron
GERN
$898M
| $134K | ﹤0.01% |
95,500
-33,400
| -26% | -$47.3K |
|
|
PPLI
4942
CALL
People Inc
PPLI
$3.12B
| $134K | ﹤0.01% |
3,700
-36,771
| -91% | -$1.33M |
|
4943
American Century US Quality Growth ETF
QGRO
$1.94B
| $134K | ﹤0.01% |
+1,236
| New | +$124K |
|
4944
Sprott Junior Uranium Miners ETF
URNJ
$302M
| $134K | ﹤0.01% |
+6,384
| New | +$107K |
|
4945
Vestis
VSTS
$1.97B
| $134K | ﹤0.01% |
+23,428
| New | +$164K |
|
4946
PUT
3D Systems Corp
DDD
$405M
| $133K | ﹤0.01% |
86,700
-143,900
| -62% | -$260K |
|
4947
CALL
Fortis
FTS
$29.3B
| $133K | ﹤0.01% |
2,800
+2,100
| +300% | +$100K |
|
4948
PUT
Kilroy Realty
KRC
$4.59B
| $133K | ﹤0.01% |
3,900
-18,100
| -82% | -$590K |
|
4949
PUT
Impinj
PI
$4.24B
| $133K | ﹤0.01% |
1,200
-900
| -43% | -$89.5K |
|
4950
Direxion Daily 7-10 Year Treasury Bull 3X ETF
TYD
$31.9M
| $133K | ﹤0.01% |
5,279
+2,320
| +78% | +$57.4K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.