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 | |
|---|---|---|---|---|---|---|
7401
CALL
Expensify
EXFY
$175M
| $18K | ﹤0.01% |
+10,100
| New | +$20.5K |
|
7402
CALL
First Commonwealth Financial
FCF
$2.12B
| $18K | ﹤0.01% |
1,100
+900
| +450% | +$15.4K |
|
7403
CALL
Fidelity Corporate Bond ETF
FCOR
$353M
| $18K | ﹤0.01% |
+400
| New | +$19K |
|
7404
Green Brick Partners
GRBK
$3.12B
| $18K | ﹤0.01% |
257
+54
| +27% | +$3.69K |
|
7405
PUT
Great Southern Bancorp
GSBC
$863M
| $18K | ﹤0.01% |
300
+100
| +50% | +$6.09K |
|
7406
Horizon Technology Finance
HRZN
$294M
| $18K | ﹤0.01% |
3,077
-870
| -22% | -$6.32K |
|
7407
CALL
Hawkins
HWKN
$2.94B
| $18K | ﹤0.01% |
100
| – | – |
|
7408
CALL
Immunocore
IMCR
$1.72B
| $18K | ﹤0.01% |
500
+100
| +25% | +$3.4K |
|
7409
iRadimed
IRMD
$1.22B
| $18K | ﹤0.01% |
+255
| New | +$17K |
|
7410
PUT
Jakks Pacific
JAKK
$297M
| $18K | ﹤0.01% |
1,000
-600
| -38% | -$11K |
|
|
KREF
7411
PUT
KKR Real Estate Finance Trust
KREF
$471M
| $18K | ﹤0.01% |
2,100
-47,300
| -96% | -$440K |
|
7412
PUT
nCino
NCNO
$1.93B
| $18K | ﹤0.01% |
700
-5,300
| -88% | -$155K |
|
7413
Ooma
OOMA
$571M
| $18K | ﹤0.01% |
+1,534
| New | +$18.8K |
|
7414
Orion Group Holdings
ORN
$503M
| $18K | ﹤0.01% |
2,169
+738
| +52% | +$5.82K |
|
7415
PUT
Pampa Energía
PAM
$4.61B
| $18K | ﹤0.01% |
300
| – | – |
|
|
PRPH
7416
DELISTED
ProPhase Labs
PRPH
| $18K | ﹤0.01% |
4,060
+2,899
| +250% | +$11.2K |
|
7417
CALL
Quad
QUAD
$438M
| $18K | ﹤0.01% |
2,900
+2,400
| +480% | +$14.8K |
|
7418
CALL
Ryder
R
$10.3B
| $18K | ﹤0.01% |
100
-2,100
| -95% | -$379K |
|
7419
CALL
RPC Inc
RES
$1.21B
| $18K | ﹤0.01% |
3,900
-200
| -5% | -$944 |
|
7420
CALL
REX American Resources
REX
$1.44B
| $18K | ﹤0.01% |
+600
| New | +$17.1K |
|
7421
CALL
RXO
RXO
$3.98B
| $18K | ﹤0.01% |
1,200
+800
| +200% | +$12.9K |
|
7422
PUT
Rayonier
RYN
$6.52B
| $18K | ﹤0.01% |
734
-1,888
| -72% | -$45.3K |
|
|
SHOE
7423
Shoe Station Group
SHOE
$410M
| $18K | ﹤0.01% |
898
-789
| -47% | -$17.1K |
|
7424
CALL
Senseonics Holdings Inc
SENS
$262M
| $18K | ﹤0.01% |
2,115
-850
| -29% | -$8.21K |
|
7425
CALL
SIGA Technologies
SIGA
$222M
| $18K | ﹤0.01% |
2,000
+1,000
| +100% | +$7.99K |
|
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.