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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2626
CALL
Seres Therapeutics
MCRB
$48M
| $1.49M | ﹤0.01% |
77,500
+11,600
| +18% | +$185K |
|
|
BTC
2627
PUT
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $1.49M | ﹤0.01% |
29,400
+9,700
| +49% | +$492K |
|
|
OPLN
2628
CALL
Openlane
OPLN
$4.17B
| $1.49M | ﹤0.01% |
51,700
+51,400
| +17,133% | +$1.4M |
|
2629
PUT
Banco Santander
SAN
$194B
| $1.49M | ﹤0.01% |
141,700
+71,700
| +102% | +$668K |
|
|
HIVE
2630
HIVE Digital Technologies
HIVE
$792M
| $1.48M | ﹤0.01% |
367,544
+147,772
| +67% | +$398K |
|
2631
Bunge Global
BG
$23.6B
| $1.48M | ﹤0.01% |
18,215
+8,499
| +87% | +$681K |
|
2632
CALL
Newell Brands
NWL
$2.16B
| $1.48M | ﹤0.01% |
282,400
+145,700
| +107% | +$826K |
|
2633
PUT
CenterPoint Energy
CNP
$29.1B
| $1.48M | ﹤0.01% |
38,100
+33,000
| +647% | +$1.25M |
|
2634
CALL
Modine Manufacturing
MOD
$12.8B
| $1.48M | ﹤0.01% |
10,400
-800
| -7% | -$102K |
|
2635
Citizens Financial Group
CFG
$30.4B
| $1.48M | ﹤0.01% |
+27,765
| New | +$1.38M |
|
2636
PUT
Ameriprise Financial
AMP
$46.8B
| $1.47M | ﹤0.01% |
3,000
+2,400
| +400% | +$1.23M |
|
2637
PUT
MoonLake Immunotherapeutics
MLTX
$1.59B
| $1.47M | ﹤0.01% |
205,500
+182,000
| +774% | +$9.49M |
|
2638
Vipshop
VIPS
$6.84B
| $1.47M | ﹤0.01% |
75,000
+36,878
| +97% | +$612K |
|
2639
PUT
New Oriental
EDU
$7.84B
| $1.47M | ﹤0.01% |
27,700
+5,000
| +22% | +$247K |
|
|
MIAX
2640
PUT
Miami International Holdings
MIAX
$4.14B
| $1.47M | ﹤0.01% |
+36,500
| New | +$1.34M |
|
2641
CALL
Build-A-Bear
BBW
$423M
| $1.47M | ﹤0.01% |
22,500
+17,800
| +379% | +$1.05M |
|
2642
CALL
Voya Financial
VOYA
$8.94B
| $1.47M | ﹤0.01% |
19,600
+18,600
| +1,860% | +$1.37M |
|
|
BTFX
2643
CALL
DELISTED
Valkyrie ETF Trust II CoinShares Bitcoin Leverage ETF
BTFX
| $1.47M | ﹤0.01% |
34,300
-83,800
| -71% | -$4.96M |
|
2644
Banco Macro
BMA
$5.7B
| $1.46M | ﹤0.01% |
34,614
+13,771
| +66% | +$841K |
|
2645
GXO Logistics
GXO
$6.06B
| $1.46M | ﹤0.01% |
27,677
-37,217
| -57% | -$1.91M |
|
2646
PUT
Lightpath Technologies
LPTH
$680M
| $1.46M | ﹤0.01% |
+184,400
| New | +$823K |
|
2647
PUT
Copa Holdings
CPA
$5.56B
| $1.46M | ﹤0.01% |
12,300
+3,900
| +46% | +$446K |
|
2648
YieldMax Ultra Option Income Strategy ETF
ULTY
$800M
| $1.46M | ﹤0.01% |
26,723
+20,706
| +344% | +$1.23M |
|
2649
PUT
Western Union
WU
$2.57B
| $1.46M | ﹤0.01% |
202,300
+104,300
| +106% | +$872K |
|
|
STUB
2650
PUT
StubHub Holdings
STUB
$3.1B
| $1.46M | ﹤0.01% |
+86,600
| New | +$1.59M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.