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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 | |
|---|---|---|---|---|---|---|---|
526
CALL
Cheniere Energy
LNG
$62.2B
| $16.8M | 0.01% |
62,300
-37,300
| -37% | -$10M |
2014 Q4
47 quarters
|
|
527
CALL
Nucor
NUE
$59.3B
| $16.7M | 0.01% |
71,400
+2,100
| +3% | +$525K |
2014 Q4
47 quarters
|
|
528
CALL
Microchip Technology
MCHP
$33.8B
| $16.7M | 0.01% |
214,600
+18,600
| +9% | +$1.45M |
2021 Q2
21 quarters
|
|
529
PUT
Regeneron Pharmaceuticals
REGN
$99.2B
| $16.7M | 0.01% |
22,000
+3,500
| +19% | +$2.64M |
2021 Q2
21 quarters
|
|
530
Nokia
NOK
$47.8B
| $16.7M | 0.01% |
1,644,366
+562,430
| +52% | +$5.84M |
2026 Q2
1 quarter
|
|
531
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$106M
| $16.6M | 0.01% |
508,900
-51,900
| -9% | -$2.02M |
2015 Q1
46 quarters
|
|
532
CALL
Cleveland-Cliffs
CLF
$7.5B
| $16.6M | 0.01% |
1,506,900
-346,700
| -19% | -$3.93M |
2015 Q3
44 quarters
|
|
533
PUT
Eaton
ETN
$140B
| $16.6M | 0.01% |
38,600
+9,500
| +33% | +$3.96M |
2021 Q2
21 quarters
|
|
534
PUT
Riot Platforms
RIOT
$6.86B
| $16.6M | 0.01% |
822,700
+278,700
| +51% | +$5.86M |
2020 Q4
23 quarters
|
|
535
CALL
Ciena
CIEN
$42B
| $16.6M | 0.01% |
47,100
+20,000
| +74% | +$7.72M |
2014 Q4
47 quarters
|
|
536
PUT
Block Inc
XYZ
$51.8B
| $16.6M | 0.01% |
225,100
-86,300
| -28% | -$6.87M |
2015 Q4
43 quarters
|
|
537
PUT
SLB Ltd
SLB
$75.2B
| $16.5M | 0.01% |
339,500
-44,500
| -12% | -$2.29M |
2014 Q4
47 quarters
|
|
538
Walmart Inc
WMT
$997B
| $16.5M | 0.01% |
158,780
+137,559
| +648% | +$15.1M |
2026 Q2
1 quarter
|
|
539
PUT
Abbott
ABT
$189B
| $16.5M | 0.01% |
166,500
-40,300
| -19% | -$4.21M |
2021 Q1
22 quarters
|
|
540
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $16.4M | 0.01% |
761,800
+411,200
| +117% | +$8.86M |
2017 Q2
37 quarters
|
|
541
PUT
Devon Energy
DVN
$51.2B
| $16.3M | 0.01% |
354,900
-32,700
| -8% | -$1.5M |
2021 Q2
21 quarters
|
|
542
CALL
Toast
TOST
$19.8B
| $16.3M | 0.01% |
563,500
+244,500
| +77% | +$7.87M |
2021 Q4
19 quarters
|
|
543
PUT
Danaher
DHR
$166B
| $16.2M | 0.01% |
73,200
+8,600
| +13% | +$1.77M |
2014 Q4
47 quarters
|
|
544
PUT
Wolfspeed
WOLF
$1.48B
| $16.2M | 0.01% |
575,200
-62,900
| -10% | -$1.81M |
2014 Q4
47 quarters
|
|
545
CALL
Plains GP Holdings
PAGP
$5.13B
| $16.2M | 0.01% |
623,700
-248,000
| -28% | -$6.55M |
2018 Q2
33 quarters
|
|
546
CALL
Johnson Controls International
JCI
$87.6B
| $16.1M | 0.01% |
108,600
+37,300
| +52% | +$5.4M |
2014 Q4
47 quarters
|
|
547
PUT
Thermo Fisher Scientific
TMO
$266B
| $16.1M | 0.01% |
23,900
-11,100
| -32% | -$6.59M |
2026 Q1
2 quarters
|
|
548
PUT
Interactive Brokers
IBKR
$37.4B
| $16M | 0.01% |
187,700
-9,300
| -5% | -$851K |
2026 Q1
2 quarters
|
|
549
CALL
Samsara
IOT
$24.7B
| $16M | 0.01% |
420,100
+23,400
| +6% | +$897K |
2021 Q4
19 quarters
|
|
550
CALL
Cameco
CCJ
$32.4B
| $16M | 0.01% |
184,800
+32,000
| +21% | +$3.02M |
2021 Q2
21 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.