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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
651
CALL
Sea Limited
SE
$45.3B
| $12.3M | 0.01% |
126,600
-50,800
| -29% | -$5.57M |
2021 Q1
22 quarters
|
|
652
PUT
STMicroelectronics
STM
$41.3B
| $12.3M | 0.01% |
230,600
-28,200
| -11% | -$1.56M |
2017 Q1
38 quarters
|
|
653
PUT
ON Semiconductor
ON
$28.7B
| $12.3M | 0.01% |
159,900
-79,800
| -33% | -$6.41M |
2021 Q2
21 quarters
|
|
654
Barrick Mining
B
$64.3B
| $12.2M | 0.01% |
300,976
+133,527
| +80% | +$5.47M |
2025 Q4
3 quarters
|
|
655
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$128M
| $12.2M | 0.01% |
691,600
+545,300
| +373% | +$10.8M |
2021 Q2
21 quarters
|
|
656
PUT
Halliburton
HAL
$27.2B
| $12.2M | 0.01% |
383,300
-156,300
| -29% | -$5.33M |
2015 Q1
46 quarters
|
|
657
CALL
Norwegian Cruise Line
NCLH
$8.64B
| $12.1M | 0.01% |
826,700
+315,200
| +62% | +$5.52M |
2026 Q1
2 quarters
|
|
658
CALL
Enbridge
ENB
$107B
| $12.1M | 0.01% |
260,600
+100,000
| +62% | +$5.17M |
2019 Q1
30 quarters
|
|
659
PUT
Capital One
COF
$119B
| $12.1M | 0.01% |
62,700
+1,700
| +3% | +$357K |
2021 Q2
21 quarters
|
|
660
CALL
Linde
LIN
$242B
| $12.1M | 0.01% |
25,500
-5,100
| -17% | -$2.51M |
2018 Q4
31 quarters
|
|
661
PUT
Iovance Biotherapeutics
IOVA
$3.74B
| $12M | 0.01% |
811,900
+442,300
| +120% | +$3.17M |
2021 Q2
21 quarters
|
|
662
CALL
VanEck Durable High Dividend ETF
DURA
$38.7M
| $12M | 0.01% |
63,900
+33,300
| +109% | +$1.29M |
2019 Q1
30 quarters
|
|
663
PUT
Oscar Health
OSCR
$10B
| $12M | 0.01% |
389,700
+35,400
| +10% | +$1.09M |
2021 Q1
22 quarters
|
|
664
CALL
Coupang
CPNG
$28.7B
| $12M | 0.01% |
865,400
-671,400
| -44% | -$10.8M |
2021 Q1
22 quarters
|
|
665
CALL
CleanSpark
CLSK
$1.77B
| $12M | 0.01% |
929,100
+70,300
| +8% | +$921K |
2020 Q3
24 quarters
|
|
666
PUT
Duolingo
DUOL
$7.74B
| $11.9M | 0.01% |
83,500
-32,200
| -28% | -$4.47M |
2021 Q4
19 quarters
|
|
|
UCD
667
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $11.9M | 0.01% |
198,000
-203,000
| -51% | -$12.2M |
2014 Q4
47 quarters
|
|
668
PUT
iShares Gold Trust
IAU
$59B
| $11.8M | 0.01% |
151,700
+114,500
| +308% | +$9.18M |
2019 Q1
30 quarters
|
|
669
CALL
Bank of New York Mellon
BNY
$103B
| $11.8M | 0.01% |
81,700
-14,300
| -15% | -$2.25M |
2021 Q2
21 quarters
|
|
670
PUT
Southwest Airlines
LUV
$22.8B
| $11.8M | 0.01% |
283,700
+62,900
| +28% | +$2.76M |
2014 Q4
47 quarters
|
|
671
PUT
United Rentals
URI
$71.3B
| $11.8M | 0.01% |
11,800
+4,600
| +64% | +$4.91M |
2014 Q4
47 quarters
|
|
672
CALL
HP
HPQ
$26.1B
| $11.8M | 0.01% |
376,500
-137,400
| -27% | -$3.97M |
2021 Q2
21 quarters
|
|
673
CALL
Ambarella
AMBA
$2.76B
| $11.8M | 0.01% |
169,400
+124,900
| +281% | +$9.04M |
2014 Q4
47 quarters
|
|
674
PUT
Amphenol
APH
$196B
| $11.8M | 0.01% |
139,500
+22,300
| +19% | +$1.8M |
2017 Q2
37 quarters
|
|
675
CALL
Madrigal Pharmaceuticals
MDGL
$10.1B
| $11.7M | 0.01% |
23,300
-1,200
| -5% | -$634K |
2026 Q1
2 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.