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 | |
|---|---|---|---|---|---|---|
726
CALL
Illinois Tool Works
ITW
$79.7B
| $16.1M | 0.01% |
61,900
+54,700
| +760% | +$14.3M |
|
727
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $16.1M | 0.01% |
41,200
+11,700
| +40% | +$4.89M |
|
|
PSKY
728
CALL
Paramount Skydance Corp
PSKY
$9.5B
| $16.1M | 0.01% |
+849,800
| New | +$13.4M |
|
729
CALL
GitLab
GTLB
$5.1B
| $16.1M | 0.01% |
356,500
+149,900
| +73% | +$6.86M |
|
730
PUT
Lamb Weston
LW
$6.79B
| $16.1M | 0.01% |
276,700
+135,600
| +96% | +$7.41M |
|
731
PUT
Peloton Interactive
PTON
$2.61B
| $16M | 0.01% |
1,776,400
+278,800
| +19% | +$2.07M |
|
732
CALL
BILL Holdings
BILL
$4.11B
| $15.9M | 0.01% |
301,100
+113,100
| +60% | +$5.25M |
|
733
CALL
Dominion Energy
D
$62.8B
| $15.8M | 0.01% |
257,500
+78,600
| +44% | +$4.67M |
|
734
CALL
Caesars Entertainment
CZR
$6.09B
| $15.7M | 0.01% |
580,200
+117,500
| +25% | +$3.18M |
|
735
CALL
Samsara
IOT
$18.3B
| $15.7M | 0.01% |
420,600
-5,800
| -1% | -$215K |
|
736
Johnson & Johnson
JNJ
$624B
| $15.6M | 0.01% |
84,282
+39,800
| +89% | +$6.82M |
|
737
CALL
3M
MMM
$87.5B
| $15.6M | 0.01% |
155,100
-108,200
| -41% | -$16.7M |
|
738
PUT
First Majestic Silver
AG
$8.12B
| $15.5M | 0.01% |
1,261,900
+201,000
| +19% | +$1.86M |
|
|
SHNY
739
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $15.5M | 0.01% |
461,300
+93,800
| +26% | +$3.14M |
|
740
CALL
Zeta Global
ZETA
$4.83B
| $15.4M | 0.01% |
776,000
+174,300
| +29% | +$3.13M |
|
741
CALL
Ondas Inc
ONDS
$4.52B
| $15.3M | 0.01% |
1,987,500
+1,448,200
| +269% | +$6.01M |
|
742
CALL
SentinelOne
S
$5.96B
| $15.3M | 0.01% |
869,800
+276,800
| +47% | +$4.97M |
|
743
PUT
Five Below
FIVE
$11.1B
| $15.3M | 0.01% |
98,600
-27,900
| -22% | -$3.95M |
|
744
CALL
Coeur Mining
CDE
$15.7B
| $15.2M | 0.01% |
812,100
+390,600
| +93% | +$4.78M |
|
745
PUT
Live Nation Entertainment
LYV
$41B
| $15.2M | 0.01% |
93,000
+22,400
| +32% | +$3.54M |
|
|
MPT
746
PUT
Medical Properties Trust
MPT
$2.87B
| $15.2M | 0.01% |
2,991,200
-1,360,800
| -31% | -$5.99M |
|
747
CALL
Wheaton Precious Metals
WPM
$50B
| $15.1M | 0.01% |
135,300
-69,300
| -34% | -$6.77M |
|
748
CALL
DexCom
DXCM
$27.2B
| $15.1M | 0.01% |
224,100
+58,200
| +35% | +$4.61M |
|
749
PUT
Teva Pharmaceuticals
TEVA
$36.3B
| $15.1M | 0.01% |
746,200
+85,100
| +13% | +$1.49M |
|
750
PUT
Hilton Worldwide
HLT
$72.9B
| $15M | 0.01% |
58,000
-33,700
| -37% | -$9.11M |
|
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.