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 | |
|---|---|---|---|---|---|---|
2276
CALL
SBA Communications
SBAC
$18.4B
| $2.11M | ﹤0.01% |
10,900
-500
| -4% | -$108K |
|
2277
PUT
InterDigital
IDCC
$6.68B
| $2.1M | ﹤0.01% |
6,100
+3,100
| +103% | +$842K |
|
|
PPL
2278
PUT
PPL Corp
PPL
$27.3B
| $2.1M | ﹤0.01% |
56,600
+36,800
| +186% | +$1.32M |
|
2279
PUT
InMode
INMD
$872M
| $2.1M | ﹤0.01% |
140,800
+37,300
| +36% | +$545K |
|
2280
CALL
Quest Diagnostics
DGX
$25.1B
| $2.1M | ﹤0.01% |
11,000
+400
| +4% | +$71K |
|
2281
CALL
Highwoods Properties
HIW
$3.71B
| $2.1M | ﹤0.01% |
65,900
+10,000
| +18% | +$306K |
|
2282
PUT
Saia
SAIA
$11.3B
| $2.1M | ﹤0.01% |
7,000
-18,900
| -73% | -$5.7M |
|
2283
CALL
OneMain Financial
OMF
$6.9B
| $2.09M | ﹤0.01% |
37,100
-6,200
| -14% | -$366K |
|
2284
PUT
Entergy
ETR
$54.1B
| $2.09M | ﹤0.01% |
22,400
-78,200
| -78% | -$6.88M |
|
2285
CALL
Green Plains
GPRE
$1.19B
| $2.08M | ﹤0.01% |
237,300
+109,300
| +85% | +$958K |
|
|
TSSI
2286
CALL
TSS Inc
TSSI
$272M
| $2.08M | ﹤0.01% |
114,700
-41,100
| -26% | -$821K |
|
2287
CALL
Redwire
RDW
$2.08B
| $2.08M | ﹤0.01% |
231,000
+126,900
| +122% | +$1.48M |
|
2288
-1x Short VIX Futures ETF
SVIX
$182M
| $2.07M | ﹤0.01% |
96,934
+76,356
| +371% | +$1.42M |
|
2289
CALL
Herbalife
HLF
$1.23B
| $2.07M | ﹤0.01% |
245,300
+99,500
| +68% | +$938K |
|
2290
CALL
Ralph Lauren
RL
$22.2B
| $2.07M | ﹤0.01% |
6,600
+900
| +16% | +$268K |
|
2291
PUT
BridgeBio Pharma
BBIO
$16.5B
| $2.07M | ﹤0.01% |
39,800
-55,900
| -58% | -$2.73M |
|
2292
NCR Voyix
VYX
$1.06B
| $2.07M | ﹤0.01% |
164,731
+3,343
| +2% | +$44.1K |
|
2293
CALL
Henry Schein
HSIC
$9.74B
| $2.06M | ﹤0.01% |
31,100
+21,400
| +221% | +$1.48M |
|
2294
CALL
Kinetik
KNTK
$3.71B
| $2.06M | ﹤0.01% |
48,300
+41,900
| +655% | +$1.77M |
|
2295
CALL
Ambarella
AMBA
$2.99B
| $2.06M | ﹤0.01% |
25,000
+1,600
| +7% | +$116K |
|
2296
PUT
Yeti Holdings
YETI
$3.82B
| $2.06M | ﹤0.01% |
62,200
-23,800
| -28% | -$832K |
|
2297
PUT
Robert Half
RHI
$3.61B
| $2.06M | ﹤0.01% |
60,700
-93,500
| -61% | -$3.51M |
|
|
GTLS
2298
CALL
DELISTED
Chart Industries
GTLS
| $2.06M | ﹤0.01% |
10,300
+8,800
| +587% | +$1.67M |
|
2299
CALL
DaVita
DVA
$15.1B
| $2.06M | ﹤0.01% |
15,500
-15,900
| -51% | -$2.18M |
|
|
ROBN
2300
T-Rex 2X Long HOOD Daily Target ETF
ROBN
$91.2M
| $2.06M | ﹤0.01% |
19,084
-11,247
| -37% | -$755K |
|
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.